Climate and monthly weather forecastBarreiro, Portugal
Climate and monthly weather forecast
The climate of Barreiro
Barreiro, situated in Portugal, experiences a Mediterranean climate, specifically classified under the Köppen climate category of Csa, characterized by hot summers. Typical of a Mediterranean climate, the town observes significant variations in temperature and precipitation over a cycle of twelve months.Throughout the year, the temperature in Barreiro fluctuates between a low of 10.2°C (50.4°F) in January and a peak of 27.1°C (80.8°F) in August. Temperature variations not only occur between seasons, but also from day to night with a difference between high and low temperatures reaching up to 15°C (59°F) in summer months. Relative humidity remains moderately stable, varying between 68% in August and 76% in January. Rainfall displays a noticeably different pattern, with a notable drop in the middle of the year. The months of January and March record 5mm (0.2"), while the rest of the year records values ranging from 1mm (0.04") in July to 15mm (0.59") in November. The annual distribution also reveals patterns in the number of rainy days, with a minimum of 0.8 days in August and a maximum of 9.3 days in November.
Barreiro experiences variable daylight hours, from a minimum of 9.5 hours in December to a maximum of 14.8 hours in June. Correspondingly, the number of sunshine hours also varies, hitting a maximum of 11.4 hours per day in July and dropping to a low of 9.8 hours in December. Wind speeds remain relatively constant through the year, with an average speed between 13.1km/h (8.1mph) in September and 16.5km/h (10.3mph) in February.
The best time to visit Barreiro
Taking into consideration the overall weather conditions including temperature, humidity, and rainfall, the best time to visit Barreiro would be from June to August. During this period, average high temperatures range from 23.8°C (74.8°F) to 27.1°C (80.8°F) and average lows range between 16.8°C (62.2°F) and 17.8°C (64°F). These months are characterized by long daylight hours, ranging from 14.3 to 14.8 hours, and ample sunshine, between 10.6 and 11.4 hours, leading to a warm and pleasant climate, ideal for a wide range of outdoor activities. Moreover, the number of rainy days is at its lowest, bringing the chance of precipitation down dramatically.The worst time to visit Barreiro
The least favorable time to visit Barreiro would be from November to January. During this period, the weather is cooler with average high temperatures dropping to between 14.9°C (58.8°F) and 17.8°C (64°F) and lows between 10.2°C (50.4°F) and 13.1°C (55.6°F). Additionally, it experiences shorter daylight hours, ranging from 9.5 to 10.1 hours and less sunshine, between 5.4 to 5.7 hours a day. The number of rainy days is at its highest, resulting in an increased chance of experiencing wet weather conditions during these months.Spring weather in Barreiro
Spring, from March to May, in Barreiro is marked by increasing temperatures from averages of 17.3°C (63.1°F) in March to 21.8°C (71.2°F) in May. Overnight lows also slowly rise from 11°C (51.8°F) in March to 14.8°C (58.6°F) in May. While the region experiences an increase in rainfall from 5mm (0.2") in March to 9mm (0.35") in April, the number of rainy days simultaneously decreases from 6.3 to 3.8. May, in particular, offers more pleasant conditions with a decline in rainfall to 5mm (0.2") and longer daylight hours, reaching 14.3 hours, as well as an increase in daily sunshine hours to 10.6.Summer weather in Barreiro
The summer months, June to August, are hot and dry with average high temperatures ranging from 23.8°C (74.8°F) to 27.1°C (80.8°F) and lows between 16.8°C (62.2°F) and 17.9°C (64.2°F). Precipitation is minimal, with rainfall of merely 1mm (0.04") and the number of rainy days fluctuating from 0.8 to 2.2 days. Daylight is abundant, varying from 14.6 to 14.8 hours and the duration of sunshine is at its peak, from 11.1 to 11.4 hours a day.Autumn weather in Barreiro
During autumn, from September to November, Barreiro sees a gradual decline in temperatures from an average high of 25.6°C (78.1°F) in September to 17.8°C (64°F) in November, while lows decrease from 17.5°C (63.5°F) to 13.1°C (55.6°F). The region also experiences a rise in rainfall, from 2mm (0.08") in September to 15mm (0.59") in November, and the number of rainy days increases from 3.1 in September to 9.3 in November.Winter weather in Barreiro
Winter, from December to February, offers cooler conditions in Barreiro with highs varying from 14.9°C (58.8°F) in December to 15.3°C (59.5°F) in February and lows ranging between 10.2°C (50.4°F) to 10.9°C (51.6°F). Rainfall is moderately spread across these months, with values between 5mm (0.2") to 8mm (0.31"), and the number of rainy days varies from 5.1 to 5.6. Daylight hours range from 9.5 to 10.8, while sunshine hours oscillate from 5.4 hours to 7.4 hours.Weather in January
The weather in Barreiro, Portugal ushers in the new year with mild temperatures, from 10.2°C (50.4°F) to 14.9°C (58.8°F). January's climate experiences moderate rainfall, occasionally interrupting the average 9.8 hours of daylight. Weather in January »Weather in February
February sees a slight enhancement in the temperature which ranges from 9.8°C (49.6°F) to 15.3°C (59.5°F) in Barreiro, Portugal. Compared to January, there are fewer rainy days, providing clearer skies and longer periods of sunlight. Weather in February »Weather in March
The weather in Barreiro, Portugal improves in March, with a 2°C (35.6°F) increase in temperature highs, now oscillating from 11°C (51.8°F) to 17.3°C (63.1°F). Compared to February, rainfall increases, but the days also get longer, allowing more sunshine. Weather in March »Weather in April
April discovers a warming Barreiro, Portugal with temperatures spanning from 12.4°C (54.3°F) to 18.6°C (65.5°F). Contrary to March, April experiences an increase in rainfall and rainy days. Wind speeds decrease, reducing the chill in the air, making strolls around the city more pleasant. Weather in April »Weather in May
May brings significant warmth to Barreiro, Portugal, with temperatures ranging from 14.8°C (58.6°F) to 21.8°C (71.2°F). Rainfall decreases since April, and the city enjoys the highest amount of daylight so far with 14.3 hours. Skyline visibility remains excellent, facilitating scenic views of Barreiro. Weather in May »Weather in June
June welcomes the beginning of summer in Barreiro, Portugal, with thermometers highlighting from 16.8°C (62.2°F) to 23.8°C (74.8°F). The city experiences fewer rainy days than in May, making outdoor activities more enjoyable. Wind speeds show minimal change, yet the UV Index sees a slight increase. Weather in June »Weather in July
July claims the peak of summer in Barreiro, Portugal, showcasing temperatures from 17.9°C (64.2°F) to 25.9°C (78.6°F). Compared to June, there is a slight decline in daylight while sunshine remains relatively the same. It is the calmest month regarding wind speeds while cloud coverage records its annual minimum. Weather in July »Weather in August
August in Barreiro, Portugal holds onto the summer heat, with a temperature swing from 17.8°C (64°F) to 27.1°C (80.8°F). Although similar to July in rainfall, August marks a decrease in daylight and a slight increase in cloud cover. Weather in August »Weather in September
September in Barreiro, Portugal brings a mild decline in temperature, now varying from 17.5°C (63.5°F) to 25.6°C (78.1°F). The month sees an increase in rainfall after two months of minimal precipitation. The daylight hours fade gradually while the relative humidity increases in comparison to August. Weather in September »Weather in October
October brings a significant drop in temperature to Barreiro, Portugal, with temperatures fluctuating between 16.8°C (62.2°F) and 22.7°C (72.9°F). The city notices a return of the rainy season compared to the preceding dry spell of September. Weather in October »Weather in November
November signifies a more significant cooling in Barreiro, Portugal, as thermometer readings display from 13.1°C (55.6°F) to 17.8°C (64°F). Rain intensifies, resulting in more rainy days compared to October, a reminder of the advancing winter. Weather in November »Weather in December
December marks the arrival of winter in Barreiro, Portugal, with mercury levels stretching from 10.9°C (51.6°F) to 15.7°C (60.3°F). Despite the temperature drop, rainfall lessens slightly compared to November. Daylight dwindles further as the winter advances, and the UV Index returns to the level observed at the year’s beginning. Weather in December »Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the coldest month, with an average high-temperature of 14.9°C (58.8°F) and an average low-temperature of 10.2°C (50.4°F).
The most humid month in Barreiro, Portugal, is January, with an average relative humidity of 76%.
Throughout the year, there are 54.2 rainfall days, and 61mm (2.4") of precipitation is accumulated.
With an average of 5.4h of sunshine, January has the least sunshine of the year in Barreiro.
The months with the lowest UV index in Barreiro are January through March, November and December, with an average maximum UV index of 4.
May through September, with an average maximum UV index of 6, are months with the highest UV index in Barreiro, Portugal.
June through August are months with the least rain when the rain falls for 2.2 days and typically aggregates up to 1mm (0.04") of rain.
The month with the longest days in Barreiro is June, with an average of 14h and 48min of daylight.
The month with the most sunshine is July, with an average of 11.4h of sunshine.
In Barreiro, the peak temperatures are generally noted in August, averaging a high of 27.1°C (80.8°F) and a low of 17.8°C (64°F).
August is the least humid month, with an average relative humidity of 68%.
On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends in Barreiro, 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.
The month with the most rainfall in Barreiro, Portugal, is November, when the rain falls for 9.3 days and typically aggregates up to 15mm (0.59") of precipitation.
December has the shortest days of the year in Barreiro, Portugal, with an average of 9h and 30min of daylight.
Average temperature
Barreiro, Portugal
The warmest month (with the highest average high temperature) is August (27.1°C).
The month with the lowest average high temperature is January (14.9°C).
The month with the highest average low temperature is July (17.9°C).
The coldest month (with the lowest average low temperature) is February (9.8°C).
Average pressure
Barreiro, Portugal
- Average pressure in January:
1022.5mbar - Average pressure in February:
1020.4mbar - Average pressure in March:
1017.9mbar - Average pressure in April:
1015.7mbar - Average pressure in May:
1016.5mbar - Average pressure in June:
1017.2mbar
- Average pressure in July:
1016.9mbar - Average pressure in August:
1016.6mbar - Average pressure in September:
1016.9mbar - Average pressure in October:
1016mbar - Average pressure in November:
1017.5mbar - Average pressure in December:
1022.6mbar
The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed
Barreiro, Portugal
- Average wind speed in January:
16km/h - Average wind speed in February:
16.5km/h - Average wind speed in March:
16.1km/h - Average wind speed in April:
15km/h - Average wind speed in May:
15.4km/h - Average wind speed in June:
15.5km/h
- Average wind speed in July:
16.1km/h - Average wind speed in August:
15km/h - Average wind speed in September:
13.1km/h - Average wind speed in October:
13.3km/h - Average wind speed in November:
15.6km/h - Average wind speed in December:
15km/h
The windiest month (with the highest average wind speed) is February (16.5km/h).
The calmest month (with the lowest average wind speed) is September (13.1km/h).
Average humidity
Barreiro, Portugal
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (68%).
Average rainfall
Barreiro, Portugal
The wettest month (with the highest rainfall) is November (15mm).
The driest months (with the least rainfall) are June, July and August (1mm).
Average rainfall days
Barreiro, Portugal
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
2.9 days - Average rainfall days in March:
6.3 days - Average rainfall days in April:
7.4 days - Average rainfall days in May:
3.8 days - Average rainfall days in June:
2.2 days
- Average rainfall days in July:
1.6 days - Average rainfall days in August:
0.8 days - Average rainfall days in September:
3.1 days - Average rainfall days in October:
6.1 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
5.1 days
The month with the highest number of rainy days is November (9.3 days).
The month with the least rainy days is August (0.8 days).
Average daylight / Average sunshine
Barreiro, Portugal
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 24min - Average sunshine in February:
7h and 24min - Average sunshine in March:
8h and 6min - Average sunshine in April:
8h and 48min - Average sunshine in May:
10h and 36min - Average sunshine in June:
11h and 6min
- Average sunshine in July:
11h and 24min - Average sunshine in August:
11h and 6min - Average sunshine in September:
9h and 24min - Average sunshine in October:
7h and 18min - Average sunshine in November:
5h and 42min - Average sunshine in December:
5h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days
Barreiro, Portugal
- Average sunshine days in January:
21.9 days - Average sunshine days in February:
21.8 days - Average sunshine days in March:
22.5 days - Average sunshine days in April:
21.1 days - Average sunshine days in May:
24.7 days - Average sunshine days in June:
26.3 days
- Average sunshine days in July:
29.7 days - Average sunshine days in August:
29.3 days - Average sunshine days in September:
26.3 days - Average sunshine days in October:
22.2 days - Average sunshine days in November:
17.7 days - Average sunshine days in December:
23.5 days
The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is November (17.7 days).
Average UV index
Barreiro, Portugal
The months with the highest UV index are May, June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover
Barreiro, Portugal
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility
Barreiro, Portugal
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
