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 sea temperature 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
A mild drop in Alta's average high-temperature is observed in September, transitioning from a fresh 12.9°C (55.2°F) in August to a chilly 9.2°C (48.6°F). Registering an almost steady temperature, Alta's nights in September see an average low of 4.5°C (40.1°F).Humidity
The average relative humidity in September in Alta, Norway, is 82%.Rainfall
In Alta, in September, during 11.4 rainfall days, 23mm (0.91") of precipitation is typically accumulated. In Alta, Norway, during the entire year, the rain falls for 113.3 days and collects up to 318mm (12.52") of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.6 snowfall days, it receives 6mm (0.24") of snow. In Alta, during the entire year, snow falls for 90.6 days and aggregates up to 728mm (28.66") of snow.Sea temperature
In September, the average sea temperature in Alta is 9°C (48.2°F).Note: Swimming in 9°C (48.2°F) at temperatures under 10°C (50°F) requires thermal swimsuits; otherwise, one can face cold shock and breathing difficulty. Even brief immersion at 13°C (55.4°F) feels frosty.
Daylight
In Alta, the average length of the day in September is 13h and 22min.On the first day of September, sunrise is at 04:44 and sunset at 20:08. On the last day of the month, sunrise is at 06:40 and sunset at 17:52 CEST.
Sunshine
In September, the average sunshine is 6.3h.UV index
The average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high daily UV index of 2 during September translates into the following directions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Stay sun-safe with clothing that is both closely woven and worn loosely. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
What are September temperatures in Alta?
What is the average humidity in September in Alta?
How much does it rain in Alta in September?
When does it start snowing in Alta?
What is the sea water temperature in September in Alta?
What is the average length of the day in September in Alta?
When is the sunrise / sunset in September in Alta?
How long on average sun shines in September in Alta?
What is the UV index intensity in September in Alta?
Average temperature in September
Alta, Norway
- Average high temperature in September: 9.2°C
The warmest month (with the highest average high temperature) is July (14.4°C).
The months with the lowest average high temperature are January and February (-6.7°C).
- Average low temperature in September: 4.5°C
The month with the highest average low temperature is July (8.7°C).
The coldest month (with the lowest average low temperature) is February (-11.9°C).
Average pressure in September
Alta, Norway
- Average pressure in September: 1009.4mbar
The month with the highest atmospheric pressure is May (1014.1mbar).
The month with the lowest atmospheric pressure is December (1001.5mbar).
Average wind speed in September
Alta, Norway
- Average wind speed in September: 13.5km/h
The windiest month (with the highest average wind speed) is March (17.5km/h).
The calmest month (with the lowest average wind speed) is August (11.8km/h).
Average humidity in September
Alta, Norway
- Average humidity in September: 82%
The month with the highest relative humidity is April (89%).
The months with the lowest relative humidity are June and July (75%).
Average rainfall in September
Alta, Norway
- Average rainfall in September: 23mm
The wettest month (with the highest rainfall) is July (44mm).
The driest month (with the least rainfall) is February (16mm).
Average rainfall days in September
Alta, Norway
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is June (17.5 days).
The month with the least rainy days is December (3.8 days).
Average snowfall in September
Alta, Norway
- Average snowfall in September: 6mm
The month with the highest snowfall is March (137mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Alta, Norway
- Average snowfall days in September: 0.6 days
The month with the highest number of snowfall days is March (14.6 days).
The months with the least snowfall days are July and August (0 days).
Average sea temperature in September
Alta, Norway
- Average sea temperature in September: 9°C
The best month for swimming (with the highest average sea temperature) is August (10°C).
The coldest months (with the lowest average sea temperature) are February, March and April (4°C).
Average daylight in September /
Average sunshine in September
Alta, Norway
- Average daylight in September: 13h and 2min
The month with the longest days is August (Average daylight: 18h and 12min).
The months with the shortest days are June and December (Average daylight: 0h and 0min).
- Average sunshine in September: 6h and 2min
The month with the most sunshine is August (Average sunshine: 8h and 36min).
The month with the least sunshine is December (Average sunshine: 0h and 24min).
Average sunshine days in September
Alta, Norway
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is January (17.3 days).
The month with the least sunshine days is June (9.1 days).
Average UV index in September
Alta, Norway
- Average UV index in September: 2
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in September
Alta, Norway
- Average cloud cover in September: 57
The month with the most cloud cover is March (Cloud cover 67).
The months with the least cloud cover are July, August and September (Cloud cover 57).
Average visibility in September
Alta, Norway
- Average visibility in September: 9km
The months with the highest visibility are June, July, August, September, October, November and December (9km).
The month with the lowest visibility is April (7km).
Alta, Norway
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