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 Luleå's average high-temperature is observed in September, transitioning from a refreshing 16.6°C (61.9°F) in August to a cool 12.5°C (54.5°F). A modest decline from daytime high temperatures is noticed in September, marking the average low at a chilly 8.6°C (47.5°F).Humidity
The average relative humidity in September in Luleå, Sweden, is 79%.Rainfall
In Luleå, in September, it is raining for 12.5 days, with typically 36mm (1.42") of accumulated precipitation. In Luleå, Sweden, during the entire year, the rain falls for 110.8 days and collects up to 409mm (16.1") of precipitation.Snowfall
June through September are months without snowfall in Luleå.Sea temperature
In Luleå, the average seawater temperature in September is 11.8°C (53.2°F).Note: You can swim in 11.8°C (53.2°F) below 10°C (50°F) with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 13°C (55.4°F) without it is tough.
Daylight
In September, the average length of the day is 13h and 5min.On the first day of September, sunrise is at 05:10 and sunset at 19:52. On the last day of the month, sunrise is at 06:40 and sunset at 18:02 CEST.
Sunshine
The average sunshine in September in Luleå is 7.3h.UV index
In Luleå, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 3 during September leads to these instructions:
Exercise prevention - Precautions against solar damage are endorsed. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Frequently asked questions
What are the temperatures in Luleå in September?
What is the average humidity in September in Luleå?
How much does it rain in Luleå in September?
When it does not snow in Luleå?
Does it snow in Luleå in September?
How cold is the water in September in Luleå?
How many hours of daylight does Luleå have in September?
When is the sunrise / sunset in September in Luleå?
How long on average sun shines in September in Luleå?
What is the UV index reading in September in Luleå?
Average temperature in September
Luleå, Sweden
- Average high temperature in September: 12.5°C
The warmest month (with the highest average high temperature) is July (17.3°C).
The month with the lowest average high temperature is January (-5.7°C).
- Average low temperature in September: 8.6°C
The month with the highest average low temperature is July (13°C).
The coldest month (with the lowest average low temperature) is February (-10.6°C).
Average pressure in September
Luleå, Sweden
- Average pressure in September: 1010.9mbar
The month with the highest atmospheric pressure is May (1014mbar).
The month with the lowest atmospheric pressure is December (1004.8mbar).
Average wind speed in September
Luleå, Sweden
- Average wind speed in September: 16.4km/h
The windiest month (with the highest average wind speed) is December (17.3km/h).
The calmest month (with the lowest average wind speed) is April (13km/h).
Average humidity in September
Luleå, Sweden
- Average humidity in September: 79%
The month with the highest relative humidity is February (93%).
The month with the lowest relative humidity is June (70%).
Average rainfall in September
Luleå, Sweden
- Average rainfall in September: 36mm
The wettest month (with the highest rainfall) is December (46mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Luleå, Sweden
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is August (13.9 days).
The month with the least rainy days is February (3.1 days).
Average snowfall in September
Luleå, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is December (178mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Luleå, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Luleå, Sweden
- Average sea temperature in September: 11.8°C
The best month for swimming (with the highest average sea temperature) is July (16.3°C).
The coldest month (with the lowest average sea temperature) is February (-0.7°C).
Average daylight in September /
Average sunshine in September
Luleå, Sweden
- Average daylight in September: 13h and 1min
The month with the longest days is June (Average daylight: 22h and 30min).
The month with the shortest days is December (Average daylight: 3h and 30min).
- Average sunshine in September: 7h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 48min).
The month with the least sunshine is December (Average sunshine: 1h and 18min).
Average sunshine days in September
Luleå, Sweden
- Average sunshine days in September: 15.1 days
The months with the most sunshine days are June and October (16.5 days).
The month with the least sunshine days is December (11.6 days).
Average UV index in September
Luleå, Sweden
- 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
Luleå, Sweden
- Average cloud cover in September: 47
The month with the most cloud cover is January (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in September
Luleå, Sweden
- Average visibility in September: 10km
The months with the highest visibility are June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March and April (7km).
Luleå, Sweden
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