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
In Alta, the average high-temperature in September marginally drops from a cool 12.9°C (55.2°F) in August to a chilly 9.2°C (48.6°F). In Alta, the average low-temperature is 4.5°C (40.1°F).Humidity
In Alta, Norway, the average relative humidity in September is 82%.Rainfall
In September, the rain falls for 11.4 days. Throughout September, 23mm (0.91") of precipitation is accumulated. Throughout the year, there are 113.3 rainfall days, and 318mm (12.52") of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in Alta. 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) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.
Daylight
In September, the average length of the day is 13h and 22min.On the first day of September, sunrise is at 04:41 and sunset at 20:12. On the last day of the month, sunrise is at 06:37 and sunset at 17:56 CEST.
Sunshine
In Alta, the average sunshine in September is 6.3h.UV index
In Alta, Norway, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: In September, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
FAQ
What is the temperature in September in Alta?
What is the average humidity in September in Alta?
How many days does it rain in September in Alta?
When does it start to snow in Alta?
What is the 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 22min
The month with the longest days is August (Average daylight: 18h and 10min).
The months with the shortest days are June and December (Average daylight: 0h and 0min).
- Average sunshine in September: 6h and 18min
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).
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