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
September
Weather in September
Temperature
The start of September signals a gentle decrease in the average high-temperature, transitioning from a warm 29.8°C (85.6°F) in August to a still moderately hot 25.8°C (78.4°F). The September nights in Seia, Portugal, bear witness to a significant drop from the daytime highs, settling at an average temperature of 12.8°C (55°F).Humidity
The average relative humidity in September in Seia is 56%.Rainfall
In Seia, in September, during 4.8 rainfall days, 15mm (0.59") of precipitation is typically accumulated. Throughout the year, in Seia, there are 116.6 rainfall days, and 496mm (19.53") of precipitation is accumulated.Snowfall
In Seia, snow does not fall in May through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September in Seia, sunrise is at 06:58 and sunset at 20:02. On the last day of the month, sunrise is at 07:26 and sunset at 19:14 WEST.
Sunshine
In September, the average sunshine is 9.4h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Prioritize safety - Recommendations to avert sunburn are shared. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Seia?
What is the average humidity in September in Seia?
How many days does it rain in September in Seia?
When it does not snow in Seia?
Does it snow in Seia in September?
How many hours of daylight does Seia have in September?
When is the sunrise / sunset in September in Seia?
How long on average sun shines in September in Seia?
What is the UV index intensity in September in Seia?
Average temperature in September
Seia, Portugal
- Average high temperature in September: 25.8°C
The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (9.8°C).
- Average low temperature in September: 12.8°C
The month with the highest average low temperature is August (14.2°C).
The coldest month (with the lowest average low temperature) is January (2.3°C).
Average pressure in September
Seia, Portugal
- Average pressure in September: 1016.8mbar
The month with the highest atmospheric pressure is December (1023mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).
Average wind speed in September
Seia, Portugal
- Average wind speed in September: 8.3km/h
The windiest month (with the highest average wind speed) is February (11.5km/h).
The calmest month (with the lowest average wind speed) is September (8.3km/h).
Average humidity in September
Seia, Portugal
- Average humidity in September: 56%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (51%).
Average rainfall in September
Seia, Portugal
- Average rainfall in September: 15mm
The wettest month (with the highest rainfall) is December (83mm).
The driest months (with the least rainfall) are July and August (7mm).
Average rainfall days in September
Seia, Portugal
- Average rainfall days in September: 4.8 days
The month with the highest number of rainy days is April (16.1 days).
The month with the least rainy days is August (2.5 days).
Average snowfall in September
Seia, Portugal
- Average snowfall in September: 0mm
The month with the highest snowfall is January (62mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Seia, Portugal
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Seia, 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 months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Seia, Portugal
- Average sunshine days in September: 24.7 days
The month with the most sunshine days is August (27.5 days).
The month with the least sunshine days is April (12.7 days).
Average UV index in September
Seia, 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
Seia, Portugal
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in September
Seia, Portugal
- Average visibility in September: 9km
The months with the highest visibility are July and August (10km).
The month with the lowest visibility is January (7km).
