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
The arrival of September corresponds with a light shift in temperature, down from a refreshing 16.7°C (62.1°F) in August to a cool 12.3°C (54.1°F). Nighttime temperature in Alatornio reflects an average dip to a frosty 7.8°C (46°F) in September, subtly cooler than its daytime highs.Humidity
In Alatornio, Finland, the average relative humidity in September is 82%.Rainfall
In Alatornio, during September, the rain falls for 9.6 days and regularly aggregates up to 26mm (1.02") of precipitation. Throughout the year, in Alatornio, there are 94 rainfall days, and 347mm (13.66") of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in Alatornio. Throughout September, in the average 0.2 snowfall days, it receives 1mm (0.04") of snow. In Alatornio, during the entire year, snow falls for 89.7 days and aggregates up to 919mm (36.18") of snow.Daylight
In September, the average length of the day in Alatornio is 13h and 6min.On the first day of the month, sunrise is at 06:01 and sunset at 20:45. On the last day of September, in Alatornio, sunrise is at 07:32 and sunset at 18:54 EEST.
Sunshine
The average sunshine in September in Alatornio, Finland, is 6.9h.UV index
The average daily maximum UV index in September in Alatornio is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 3 suggests this advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. When the Sun is at its strongest around midday, find shade and limit exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Frequently asked questions
What is the usual temperature for Alatornio in September?
What is the average humidity in September in Alatornio?
How many days does it rain in September in Alatornio?
When does it start to snow in Alatornio?
How many hours of daylight does Alatornio have in September?
When are sunrise and sunset in September in Alatornio?
How many hours of sunshine does Alatornio have in September?
What is the UV index intensity in September in Alatornio?
Average temperature in September
Alatornio, Finland
- Average high temperature in September: 12.3°C
The warmest month (with the highest average high temperature) is July (18.3°C).
The month with the lowest average high temperature is January (-6.3°C).
- Average low temperature in September: 7.8°C
The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is January (-10.9°C).
Average pressure in September
Alatornio, Finland
- Average pressure in September: 1010.9mbar
The month with the highest atmospheric pressure is May (1013.9mbar).
The month with the lowest atmospheric pressure is December (1004.9mbar).
Average wind speed in September
Alatornio, Finland
- Average wind speed in September: 15.3km/h
The windiest months (with the highest average wind speed) are November and December (16.3km/h).
The calmest month (with the lowest average wind speed) is April (12km/h).
Average humidity in September
Alatornio, Finland
- Average humidity in September: 82%
The months with the highest relative humidity are January and February (94%).
The month with the lowest relative humidity is June (70%).
Average rainfall in September
Alatornio, Finland
- Average rainfall in September: 26mm
The wettest month (with the highest rainfall) is December (42mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in September
Alatornio, Finland
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is July (11.8 days).
The month with the least rainy days is February (3.1 days).
Average snowfall in September
Alatornio, Finland
- Average snowfall in September: 1mm
The month with the highest snowfall is March (203mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Alatornio, Finland
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is January (19.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Alatornio, Finland
- Average daylight in September: 13h and 1min
The month with the longest days is July (Average daylight: 20h and 42min).
The month with the shortest days is December (Average daylight: 3h and 18min).
- Average sunshine in September: 6h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 54min).
The month with the least sunshine is December (Average sunshine: 1h and 12min).
Average sunshine days in September
Alatornio, Finland
- Average sunshine days in September: 19 days
The month with the most sunshine days is June (20.8 days).
The month with the least sunshine days is February (9.3 days).
Average UV index in September
Alatornio, Finland
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Alatornio, Finland
- Average cloud cover in September: 51
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 40).
Average visibility in September
Alatornio, Finland
- Average visibility in September: 9km
The months with the highest visibility are June, July and August (10km).
The month with the lowest visibility is January (6km).
Alatornio, Finland
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