September weather forecastTromsø, Norway
September
Weather in September
In September, Tromsø slowly starts oscillating towards cooler temperatures as autumn begins to creep. There is a noticeable difference in weather conditions compared to August, with night starting to gather darkness once more. Despite the seasonal change, the recorded snowfall remains relatively low at 16mm (0.63"). September's characteristic scenery is ubiquitously adorned in gentle shades of fall, making picturesque landscapes. Despite the paucity of midnight sun, it is still an excellent time to enjoy the panoramic mountain views and autumn wildlife.Temperature
The arrival of September suggests a slight decrease in the average high-temperature, moving from a moderate 13.1°C (55.6°F) in August to a frosty 9.7°C (49.5°F). Tromsø's evenings during September maintain an average temperature of 5.4°C (41.7°F), aligning closely with the daytime temperatures.Humidity
The average relative humidity in September in Tromsø, Norway, is 83%.Rainfall
In Tromsø, in September, during 17.6 rainfall days, 80mm (3.15") of precipitation is typically accumulated. In Tromsø, during the entire year, the rain falls for 148.1 days and collects up to 987mm (38.86") of precipitation.Snowfall
Months with snowfall in Tromsø, Norway, are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 16mm (0.63") of snow. Throughout the year, in Tromsø, there are 120.1 snowfall days, and 2826mm (111.26") of snow is accumulated.Sea temperature
In Tromsø, Norway, the average seawater temperature in September is 10.1°C (50.2°F).Note: Swimming in 10.1°C (50.2°F) feels unbearing at 13°C (55.4°F) and can be life-risking below 10°C (50°F), causing breathing issues and cold shock, depending on a person's capacity.
Daylight
In Tromsø, the average length of the day in September is 13h and 20min.On the first day of September, sunrise is at 05:04 and sunset at 20:23. On the last day of the month, sunrise is at 06:57 and sunset at 18:10 CEST.
Sunshine
In September, the average sunshine in Tromsø is 5.7h.UV index
In Tromsø, the average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: A daily maximum UV index of 2 in September translates into the following instructions:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Tromsø, Norway
- Average high temperature in September: 9.7°C
The warmest month (with the highest average high temperature) is July (13.9°C).
The month with the lowest average high temperature is January (-4.5°C).
- Average low temperature in September: 5.4°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 (-9.1°C).
Average pressure in September
Tromsø, Norway
- Average pressure in September: 1008.9mbar
The month with the highest atmospheric pressure is May (1013.8mbar).
The month with the lowest atmospheric pressure is December (1000.7mbar).
Average wind speed in September
Tromsø, Norway
- Average wind speed in September: 11.9km/h
The windiest month (with the highest average wind speed) is March (17km/h).
The calmest month (with the lowest average wind speed) is July (9.5km/h).
Average humidity in September
Tromsø, Norway
- Average humidity in September: 83%
The month with the highest relative humidity is April (89%).
The month with the lowest relative humidity is July (79%).
Average rainfall in September
Tromsø, Norway
- Average rainfall in September: 80mm
The wettest month (with the highest rainfall) is March (103mm).
The driest month (with the least rainfall) is July (55mm).
Average rainfall days in September
Tromsø, Norway
- Average rainfall days in September: 17.6 days
The month with the highest number of rainy days is June (19.3 days).
The month with the least rainy days is February (4.7 days).
Average snowfall in September
Tromsø, Norway
- Average snowfall in September: 16mm
The month with the highest snowfall is March (569mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Tromsø, Norway
- Average snowfall days in September: 1 days
The month with the highest number of snowfall days is March (22.9 days).
The months with the least snowfall days are July and August (0 days).
Average sea temperature in September
Tromsø, Norway
- Average sea temperature in September: 10.1°C
The best month for swimming (with the highest average sea temperature) is August (11.3°C).
The coldest month (with the lowest average sea temperature) is March (4.2°C).
Average daylight in September /
Average sunshine in September
Tromsø, Norway
- Average daylight in September: 13h and 18min
The month with the longest days is August (Average daylight: 18h and 0min).
The months with the shortest days are June and December (Average daylight: 0h and 0min).
- Average sunshine in September: 5h and 42min
The month with the most sunshine is August (Average sunshine: 8h and 0min).
The month with the least sunshine is December (Average sunshine: 0h and 24min).
Average sunshine days in September
Tromsø, Norway
- Average sunshine days in September: 10.6 days
The month with the most sunshine days is January (13.2 days).
The month with the least sunshine days is March (6.2 days).
Average UV index in September
Tromsø, 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
Tromsø, Norway
- Average cloud cover in September: 62
The month with the most cloud cover is March (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 58).
Average visibility in September
Tromsø, Norway
- Average visibility in September: 9km
The months with the highest visibility are June, July, August, September, October and November (9km).
The month with the lowest visibility is April (7km).
