Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Viseu in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 29.6°C (85.3°F) to a still moderately hot 26.5°C (79.7°F). A significant temperature decrease to an average a cool 12.5°C (54.5°F) characterizes Viseu's nighttime temperatures during September.Humidity
In Viseu, Portugal, the average relative humidity in September is 60%.Rainfall
In Viseu, Portugal, in September, during 6.2 rainfall days, 21mm (0.83") of precipitation is typically accumulated. In Viseu, during the entire year, the rain falls for 125.4 days and collects up to 553mm (21.77") of precipitation.Snowfall
April through October and December are months without snowfall in Viseu.Daylight
The average length of the day in September in Viseu is 12h and 28min.On the first day of September, sunrise is at 06:59 and sunset at 20:03. On the last day of the month, sunrise is at 07:27 and sunset at 19:15 WEST.
Sunshine
In September, the average sunshine in Viseu is 9.3h.UV index
In Viseu, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Experience reduced UV exposure by about half when donning a wide-brim hat.
Frequently asked questions
What are the temperatures in Viseu in September?
What is the average humidity in September in Viseu?
How many days does it rain in September in Viseu?
When it does not snow in Viseu?
How many hours of daylight does Viseu have in September?
When are sunrise and sunset in September in Viseu?
How long on average sun shines in September in Viseu?
What is the UV index intensity in September in Viseu?
Average temperature in September
Viseu, Portugal
- Average high temperature in September: 26.5°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 September: 12.5°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 in September
Viseu, Portugal
- Average pressure in September: 1017mbar
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 in September
Viseu, Portugal
- Average wind speed in September: 7km/h
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 in September
Viseu, Portugal
- Average humidity in September: 60%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (57%).
Average rainfall in September
Viseu, Portugal
- Average rainfall in September: 21mm
The wettest month (with the highest rainfall) is December (92mm).
The driest month (with the least rainfall) is July (6mm).
Average rainfall days in September
Viseu, Portugal
- Average rainfall days in September: 6.2 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 in September
Viseu, Portugal
- Average snowfall in September: 0mm
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 in September
Viseu, Portugal
- Average snowfall days in September: 0 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 in September /
Average sunshine in September
Viseu, Portugal
- Average daylight in September: 12h and 3min
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 September: 9h 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 in September
Viseu, Portugal
- Average sunshine days in September: 22.9 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 in September
Viseu, Portugal
- Average UV index in September: 5
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 in September
Viseu, Portugal
- Average cloud cover in September: 22
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 in September
Viseu, Portugal
- Average visibility in September: 9km
The months with the highest visibility are June, July, August and September (9km).
The months with the lowest visibility are January and November (7km).
Viseu, Portugal
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