September weather forecastUmeå, Sweden
September
Weather in September
September in Umeå is characterised by the onset of autumn. The change in season is signified by a moderate drop in temperatures compared to August. Leaves turning vibrant hues of orange, red and yellow make the city a picturesque sight. A noticeable decline in daylight hours indicates the progression towards winter. While rainfall becomes more prevalent, the month is devoid of any snowfall.Temperature
The shift from August to September in Umeå includes a small decrease in the average high-temperature, from 17.4°C (63.3°F) to a still refreshing 13.3°C (55.9°F). The temperature during September nights demonstrates a small drop from the daytime highs, settling to an average of 8.4°C (47.1°F).Humidity
The average relative humidity in September in Umeå is 80%.Rainfall
In Umeå, during September, the rain falls for 13.7 days and regularly aggregates up to 33mm (1.3") of precipitation. Throughout the year, there are 126.6 rainfall days, and 418mm (16.46") of precipitation is accumulated.Snowfall
In Umeå, Sweden, snow does not fall in June through September.Sea temperature
In Umeå, the average seawater temperature in September is 12°C (53.6°F).Note: Engaging in a swim in 12°C (53.6°F) can threaten life. Brief exposure to 13°C (55.4°F) waters is uneasy, and submersion below 10°C (50°F) can lead to cold shock and disrupted breathing patterns, varying by individual.
Daylight
In Umeå, the average length of the day in September is 13h and 1min.On the first day of the month, sunrise is at 05:24 and sunset at 19:53. On the last day of September, in Umeå, sunrise is at 06:46 and sunset at 18:11 CEST.
Sunshine
The average sunshine in September is 7.7h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the UV index of 3 transforms into the following advice:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Umeå, Sweden
- Average high temperature in September: 13.3°C
The warmest month (with the highest average high temperature) is July (18.4°C).
The months with the lowest average high temperature are January and February (-3.5°C).
- Average low temperature in September: 8.4°C
The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is February (-7.6°C).
Average pressure in September
Umeå, Sweden
- Average pressure in September: 1011.5mbar
The month with the highest atmospheric pressure is May (1014.2mbar).
The month with the lowest atmospheric pressure is December (1005.3mbar).
Average wind speed in September
Umeå, Sweden
- Average wind speed in September: 14.9km/h
The windiest month (with the highest average wind speed) is December (17.8km/h).
The calmest month (with the lowest average wind speed) is July (13km/h).
Average humidity in September
Umeå, Sweden
- Average humidity in September: 80%
The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is June (70%).
Average rainfall in September
Umeå, Sweden
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is December (46mm).
The driest month (with the least rainfall) is April (22mm).
Average rainfall days in September
Umeå, Sweden
- Average rainfall days in September: 13.7 days
The months with the highest number of rainy days are July and August (14 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in September
Umeå, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is March (199mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Umeå, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Umeå, Sweden
- Average sea temperature in September: 12°C
The best month for swimming (with the highest average sea temperature) is August (15°C).
The coldest months (with the lowest average sea temperature) are February and March (0°C).
Average daylight in September /
Average sunshine in September
Umeå, Sweden
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 36min).
The month with the shortest days is December (Average daylight: 4h and 30min).
- Average sunshine in September: 7h and 42min
The month with the most sunshine is June (Average sunshine: 13h and 0min).
The month with the least sunshine is December (Average sunshine: 1h and 30min).
Average sunshine days in September
Umeå, Sweden
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is June (15.7 days).
The month with the least sunshine days is November (10.1 days).
Average UV index in September
Umeå, 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, November and December (UV index 1).
Average cloud cover in September
Umeå, Sweden
- Average cloud cover in September: 45
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in September
Umeå, Sweden
- Average visibility in September: 9km
The months with the highest visibility are June, July and August (10km).
The months with the lowest visibility are January, February and March (8km).
