Yearly & Monthly weather - Viseu, Portugal

The climate of Viseu

With consideration to the Köppen climate classification system, Viseu, Portugal possesses a warm summer Mediterranean climate, denoted as Csb. This climatic type mainly characterizes regions that reside in the western portions of continents, typically between latitudes 30°and 45°, although in Viseu's case, it is found near 40.6°latitude and -7.9°longitude.

Viseu's temperature patterns reveal a well-defined oscillation as the seasons change throughout the year. Highest average monthly temperatures, peaking at 29.6°C (85.3°F), tend to occur in the summertime, particularly from July to August, while cooler months are dominated by the late autumn and winter months, with an average low of 3.1°C (37.6°F) in January. Humidity sees a similar cyclic trend, with higher percentages mainly in the colder months, particularly from November to February, reaching up to 85% in January, then gradually tapering down during spring and reaching a minimum of 57% during August.

A noteworthy characteristic in Viseu's climatic regime is the rainfall pattern. Maximum rainfall, peaking at 92mm (3.62"), occurs during December and minimum rainfall, which slides to a low of 6mm (0.24"), is observed during July. Despite these notable fluctuations in the rainfall amounts throughout the year, mere variations in snowfall are profoundly limited. The city experiences striking low snowfall, rarely exceeding 3mm (0.12"), from January to March, whereas no snowfall has been registered from April to December. Furthermore, sunshine hours in Viseu are aplenty, especially from June reaching a high of 15 hours per day, then gradually decreasing as the year concludes.

The best time to visit Viseu

Considering the overall weather conditions, the period from May to September serves as an optimum choice to visit Viseu. These months mark the arrival of summer and extend into early autumn, characterized by pleasant temperatures oscillating from highs of 21.2°C (70.2°F) to 29.6°C (85.3°F), and lows between 9°C (48.2°F) and 13.3°C (55.9°F). Besides, these months are known to boast ample sunlight with daily sunshine hours varying from 14.5 to 14.7 hours.

Accompanied by lower humidity levels hovering between 57% and 71%, the conditions during these months are amenable to outdoor activities and sightseeing endeavors. Additionally, rainfall during this period is quite modest, notably the driest months being July and August with rainfall averages of 6mm (0.24") and 7mm (0.28") respectively. The cooling sea breezes also lend a refreshing atmosphere with average wind speeds varying between 7.4km/h (4.6mph) to 8.1km/h (5mph).

The worst time to visit Viseu

Visitors are likely to find the months from November to February less favorable due to colder temperatures and increased rainfall. The average monthly temperature in this period rarely climbs above 13.4°C (56.1°F), with monthly lows steeply dropping to 3.1°C (37.6°F) in January. Moreover, these months are associated with higher levels of relative humidity, scaling up to 85% in January imparting dampness to the cold weather.

Rainfall typically intensifies during these months, with average monthly measurements tallying up to 81mm (3.19") in November and peaking at 92mm (3.62") in December. Alongside, the number of sunshine hours dwindles, averaging between 9.3 and 9.9 hours daily during this winter season whose grip is also marked with occasional snowfall incidents, albeit modest in nature with maximum snowfall reaching only 3mm (0.12") in January.

Spring weather in Viseu

Spring, extending from March through May, in Viseu unfolds with anticipated warmth, as temperatures gradually ascend from a monthly average low of 4.3°C (39.7°F) to 9°C (48.2°F), and highs fluctuating between 14.6°C (58.3°F) and 21.2°C (70.2°F). This transition of weather from the lingering cold of the winter months creates a refreshing ambience and revives the natural beauty of the city.

Rainfall averages for spring fall within a rather snug range of 31mm (1.22") to 61mm (2.4"), thereby not disrupting the warming trend of temperatures. This balance of moderately warm temperatures and modest rainfall fosters the blooming of flora, making it a delightful sight to spectate.

Summer weather in Viseu

Viseu's summer initiates in June and extends to August, marked by a significant escalation in temperatures. The daily average high reaches its pinnacle at 29.6°C (85.3°F) during August while the average lows remain comfortingly warm, ranging from 11.2°C (52.2°F) to 13.5°C (56.3°F). The relative humidity decreases gradually during this period, with the lowest measurement being 57% in August.

Rainfall minimizes considerably during the summer months, bottoming out at a low of 6mm (0.24") in July, thus creating a predominantly dry and warm atmosphere. This balmy climate coupled with ample sunshine and vibrant summer tones makes for great sightseeing and outdoor explorations.

Autumn weather in Viseu

Autumn in Viseu, lasting from September through November, witnesses a gradual drop in temperatures. Average highs steeply decline from a summertime 26.5°C (79.7°F) in September to 13.4°C (56.1°F) in November, and the lows also present a downtrend dipping from 12.5°C (54.5°F) to 6.2°C (43.2°F). A significant uptick in rainfall occurs during this season, especially in November, where average rainfall swells to 81mm (3.19").

While the autumn months exhibit a noticeable increase in cloud cover, periods of sunshine still persist with daily average sunshine hours decreasing from 12.5 hours in September to 9.9 hours in November. The shifting weather in combination with the picturesque fall foliage makes this period appealing in a unique way.

Winter weather in Viseu

Winter takes hold of Viseu from December to February. It invites a considerably cold atmosphere with average low temperatures ranging from 3.1°C (37.6°F) in January to 4.2°C (39.6°F) in February and average high remaining within the vicinity of 10.7°C (51.3°F) in December to 11.6°C (52.9°F) in February.

Despite bearing an increased cloud cover during these months, sunshine is far from scarce with daily average sunshine hours staying close to 9.3 hours. Rainfall is relatively high, peaking at 92mm (3.62") in December. Moreover, while Viseu does technically observe snowfall during winter, the events are sparse and the quantity of snow rarely exceeds 3mm (0.12") per event.

Weather in January

January ushers in the new year with cooler temperatures in Viseu, Portugal, along with a fresh and moist atmosphere due to rainfall. Morning fog might be witnessed, owing to the high relative humidity of 85%. The city experiences its highest rainfall during January with a whopping 92mm (3.62") rain showers. Weather in January »

Weather in February

Transitioning from January, the month of February brings slight temperature enhancements as Viseu ventures into the end of winters. Snowfall continues to cloak the city with a magic of its own, enticing any lover of cold weather. Weather in February »

Weather in March

March signals the arrival of Spring in Viseu, contributing a renewed energy to the city. Considerably warmer days start making their presence known. Notably, the thickness of cloud cover reduces from 52% in February to 45% in March, allowing broader sunlit hours. Weather in March »

Weather in April

April witnesses a significant increase in the temperature, indicating a definite arrival of spring. The month also brings a decrease in cloud cover, painting more clear skies throughout Viseu. The average wind speed decreases to 8.1km/h (5mph) contributing to calmer days. Weather in April »

Weather in May

May marks a drastic change in the weather scenario of Viseu, as the city starts to warm up considerably. This month is a transition between the mildness of spring and the approaching heat of summer. Due to the increased temperatures, there is no snowfall recorded during this month. Weather in May »

Weather in June

June is a precursor to the summer season in Viseu, demonstrating warmer days with increased sunshine hours. Pleasant weather dominates, making it an ideal time for sightseeing in the city. The daylight hours increase substantially from 14.5 hours in May to 15 hours in June. Weather in June »

Weather in July

July presents the peak of summer in Viseu, with noticeably high temperatures. The heat remains persistently high during the days and even during the nights. With a high UV index of 6, sun protection becomes a necessity in July. Remarkably, the rainfall frequency drops to a minimum this month, recording a low of 4.3 rainy days. Weather in July »

Weather in August

August continues the summer trend from July, with high temperatures prevalent throughout the day and night. Clear skies dominate this month, attributing to reduced cloud cover. Coupled with the generally warm weather, the city records the highest average temperature of 29.6°C (85.3°F), making August the hottest month in Viseu. Weather in August »

Weather in September

September comes with a gentle dip in temperatures, signalling the coming of the fall season. The weather remains relatively dry, with a minor increase in the number of rainy days in contrast to August. The daylight hours begin to shorten from 14.7 hours in August to 12.5 hours in September, indicating the approach of shorter days. Weather in September »

Weather in October

October marks a further decrease in temperatures as the fall season fully arrives in Viseu. Compared to September, the daylight hours shorten to 11.1 hours in October. The cloud cover rises, painting beautiful autumnal skies across the city. Weather in October »

Weather in November

November shows a further transition into the colder months with a drop in temperatures. As winter looms, this month also witnesses an increase in rainfall. November sees an increase in the average wind speed from 7.7km/h (4.8mph) in October to 8.4km/h (5.2mph). Weather in November »

Weather in December

December brings in the winters, along with the holiday cheer in Viseu. Snowfall makes a subtle appearance, adding to the festive ambiance. The average wind speed holds steady at 8.6km/h (5.3mph), consistent with the wind speed of November. Weather in December »

Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in Viseu?

Viseu records the coldest temperatures in January, averaging a high of 10.7°C (51.3°F) and a low of 3.1°C (37.6°F).

What is the most humid month in Viseu?

With an average relative humidity of 85%, January is the most humid month.

How many days does it rain in Viseu?

Throughout the year, in Viseu, Portugal, there are 125.4 rainfall days, and 553mm (21.77") of precipitation is accumulated.

When does it snow in Viseu?

January through March and November are months with snowfall.

What is the snowiest month in Viseu?

The months with the most snowfall are January and February, with an average 3mm (0.12") of accumulated snow.

How much does it snow in Viseu?

In Viseu, Portugal, during the entire year, snow falls for 1.1 days and aggregates up to 9mm (0.35") of snow.

What is the month with the least sunshine in Viseu?

With an average of 4.7h of sunshine, January has the least sunshine of the year.

When is the lowest UV index in Viseu?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Viseu, Portugal.

When it does not snow in Viseu?

In Viseu, Portugal, snow does not fall in April through October and December.

When are the longest days in Viseu?

June has the longest days of the year in Viseu, with an average of 15h and 0min of daylight.

What is the driest month in Viseu?

The month with the least rainfall is July, when the rain falls for 4.3 days and typically collects 6mm (0.24") of precipitation.

What month has the most sunshine in Viseu?

With an average of 11.5h of sunshine, July has the most sunshine of the year in Viseu, Portugal.

When is the highest UV index in Viseu?

July and August, with an average maximum UV index of 6, are months with the highest UV index in Viseu, Portugal.

What is the hottest time of year in Viseu?

In Viseu, Portugal, the average highest temperatures are observed in August, with a high of 29.6°C (85.3°F) and a low of 13.5°C (56.3°F).

What is the least humid month in Viseu?

August is the least humid month, with an average relative humidity of 57%.

When is Daylight Saving Time (DST) in Viseu?

On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends in Viseu, Portugal, and the time zone changes from WEST to WET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 01:00, and the time zone reverts from WET to WEST.

What is the wettest month in Viseu?

The month with the most rainfall is December, when the rain falls for 11.5 days and typically aggregates up to 92mm (3.62") of precipitation.

What is the month with the shortest days in Viseu?

The month with the shortest days in Viseu is December, with an average of 9h and 18min of daylight.

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Year J F M A M J J A S O N D

Average temperature
Viseu, Portugal

Average high temperature in January:
10.7°C
Average high temperature in February:
11.8°C
Average high temperature in March:
14.6°C
Average high temperature in April:
17°C
Average high temperature in May:
21.2°C
Average high temperature in June:
25°C

Average high temperature in July:
29.1°C
Average high temperature in August:
29.6°C
Average high temperature in September:
26.5°C
Average high temperature in October:
20.7°C
Average high temperature in November:
13.4°C
Average high temperature in December:
11.6°C

The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (10.7°C).

Average low temperature in January:
3.1°C
Average low temperature in February:
3.2°C
Average low temperature in March:
4.3°C
Average low temperature in April:
6.2°C
Average low temperature in May:
9°C
Average low temperature in June:
11.2°C

Average low temperature in July:
13.3°C
Average low temperature in August:
13.5°C
Average low temperature in September:
12.5°C
Average low temperature in October:
10.4°C
Average low temperature in November:
6.2°C
Average low temperature in December:
4.2°C

The month with the highest average low temperature is August (13.5°C).
The coldest month (with the lowest average low temperature) is January (3.1°C).

Average pressure
Viseu, Portugal

Average pressure in January:
1022.1mbar
Average pressure in February:
1020.1mbar
Average pressure in March:
1017.6mbar
Average pressure in April:
1015.2mbar
Average pressure in May:
1016.2mbar
Average pressure in June:
1016.6mbar

Average pressure in July:
1016.4mbar
Average pressure in August:
1016.4mbar
Average pressure in September:
1017mbar
Average pressure in October:
1016.2mbar
Average pressure in November:
1017.3mbar
Average pressure in December:
1022.9mbar

The month with the highest atmospheric pressure is December (1022.9mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).

Average wind speed
Viseu, Portugal

The windiest month (with the highest average wind speed) is March (9.1km/h).
The calmest month (with the lowest average wind speed) is September (7km/h).

Average humidity
Viseu, Portugal

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (57%).

Average rainfall
Viseu, Portugal

The wettest month (with the highest rainfall) is December (92mm).
The driest month (with the least rainfall) is July (6mm).

Average rainfall days
Viseu, Portugal

Average rainfall days in January:
13.8 days
Average rainfall days in February:
11.3 days
Average rainfall days in March:
14.8 days
Average rainfall days in April:
15.4 days
Average rainfall days in May:
10.9 days
Average rainfall days in June:
7.2 days

Average rainfall days in July:
4.3 days
Average rainfall days in August:
3.3 days
Average rainfall days in September:
6.2 days
Average rainfall days in October:
11.2 days
Average rainfall days in November:
15.5 days
Average rainfall days in December:
11.5 days

The month with the highest number of rainy days is November (15.5 days).
The month with the least rainy days is August (3.3 days).

Average snowfall
Viseu, Portugal

The months with the highest snowfall are January and February (3mm).
The months with the least snowfall are April, May, June, July, August, September, October and December (0mm).

Average snowfall days
Viseu, Portugal

Average snowfall days in January:
0.4 days
Average snowfall days in February:
0.3 days
Average snowfall days in March:
0.2 days
Average snowfall days in April:
0 days
Average snowfall days in May:
0 days
Average snowfall days in June:
0 days

Average snowfall days in July:
0 days
Average snowfall days in August:
0 days
Average snowfall days in September:
0 days
Average snowfall days in October:
0 days
Average snowfall days in November:
0.1 days
Average snowfall days in December:
0.1 days

The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
Viseu, Portugal

Average daylight in January:
9h and 4min
Average daylight in February:
10h and 4min
Average daylight in March:
12h and 0min
Average daylight in April:
13h and 2min
Average daylight in May:
14h and 3min
Average daylight in June:
15h and 0min

Average daylight in July:
14h and 4min
Average daylight in August:
13h and 4min
Average daylight in September:
12h and 3min
Average daylight in October:
11h and 1min
Average daylight in November:
9h and 5min
Average daylight in December:
9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

Average sunshine in January:
4h and 4min
Average sunshine in February:
6h and 1min
Average sunshine in March:
7h and 1min
Average sunshine in April:
7h and 5min
Average sunshine in May:
9h and 4min
Average sunshine in June:
10h and 2min

Average sunshine in July:
11h and 3min
Average sunshine in August:
11h and 2min
Average sunshine in September:
9h and 2min
Average sunshine in October:
6h and 3min
Average sunshine in November:
5h and 1min
Average sunshine in December:
5h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days
Viseu, Portugal

Average sunshine days in January:
14.8 days
Average sunshine days in February:
15.6 days
Average sunshine days in March:
14.8 days
Average sunshine days in April:
13 days
Average sunshine days in May:
18.3 days
Average sunshine days in June:
20.8 days

Average sunshine days in July:
26.2 days
Average sunshine days in August:
26.8 days
Average sunshine days in September:
22.9 days
Average sunshine days in October:
18.6 days
Average sunshine days in November:
13.5 days
Average sunshine days in December:
18.3 days

The month with the most sunshine days is August (26.8 days).
The month with the least sunshine days is April (13 days).

Average UV index
Viseu, Portugal

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover
Viseu, Portugal

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 17).

Average visibility
Viseu, Portugal

The months with the highest visibility are June, July, August and September (9km).
The months with the lowest visibility are January and November (7km).

Climate and monthly weather forecastViseu, Portugal

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