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 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
September reports an average high-temperature of a still moderately hot 25.6°C (78.1°F), slightly varied from August's 27.1°C (80.8°F). September's average low-temperature reading in Arialva settles at a comfortable 17.5°C (63.5°F).Humidity
The average relative humidity in September is 69%.Rainfall
In Arialva, in September, during 3.1 rainfall days, 2mm (0.08") of precipitation is typically accumulated. In Arialva, during the entire year, the rain falls for 54.2 days and collects up to 61mm (2.4") of precipitation.Daylight
The average length of the day in September in Arialva is 12h and 26min.On the first day of the month, sunrise is at 07:06 and sunset at 20:06. On the last day of September, in Arialva, sunrise is at 07:32 and sunset at 19:20 WEST.
Sunshine
In September, the average sunshine is 9.4h.UV index
May through September, with an average maximum UV index of 6, are months with the highest UV index in Arialva. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Arialva?
What is the average humidity in September in Arialva?
How many days does it rain in September in Arialva?
How many hours of daylight does Arialva have in September?
When are sunrise and sunset in September in Arialva?
How many hours of sunshine does Arialva have in September?
What is the month with the highest UV index in Arialva?
What is the UV index intensity in September in Arialva?
Average temperature in September
Arialva, Portugal
- Average high temperature in September: 25.6°C
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).
- Average low temperature in September: 17.5°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 in September
Arialva, Portugal
- Average pressure in September: 1016.9mbar
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 in September
Arialva, Portugal
- Average wind speed in September: 13.1km/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 in September
Arialva, Portugal
- Average humidity in September: 69%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Arialva, Portugal
- Average rainfall in September: 2mm
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 in September
Arialva, Portugal
- Average rainfall days in September: 3.1 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 in September /
Average sunshine in September
Arialva, Portugal
- Average daylight in September: 12h and 2min
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 September: 9h and 2min
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 in September
Arialva, Portugal
- Average sunshine days in September: 26.3 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 in September
Arialva, Portugal
- Average UV index in September: 6
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 in September
Arialva, Portugal
- Average cloud cover in September: 16
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 in September
Arialva, Portugal
- Average visibility in September: 10km
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).
