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 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
September
Weather in September
Temperature
Forsmark in September undergoes a slight reduction in the average high-temperature, shifting from August's enjoyable 19.6°C (67.3°F) to a moderate 15.2°C (59.4°F). A slight dip in temperature to a fresh 10.8°C (51.4°F) marks the average nights in Forsmark during September.Humidity
The average relative humidity in September in Forsmark, Sweden, is 79%.Rainfall
In Forsmark, during September, the rain falls for 13.5 days and regularly aggregates up to 24mm (0.94") of precipitation. Throughout the year, there are 136.5 rainfall days, and 345mm (13.58") of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Forsmark, the average length of the day in September is 12h and 53min.On the first day of the month, sunrise is at 05:42 and sunset at 19:51. On the last day of September, sunrise is at 06:52 and sunset at 18:22 CEST.
Sunshine
The average sunshine in September is 8.3h.UV index
In Forsmark, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Take necessary precautions - Protection from skin and eye injury is mandatory. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Forsmark, Sweden
- Average high temperature in September: 15.2°C
The warmest month (with the highest average high temperature) is July (19.7°C).
The months with the lowest average high temperature are January and February (-0.1°C).
- Average low temperature in September: 10.8°C
The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is February (-2.9°C).
Average pressure in September
Forsmark, Sweden
- Average pressure in September: 1012.9mbar
The month with the highest atmospheric pressure is May (1014.7mbar).
The month with the lowest atmospheric pressure is December (1007.1mbar).
Average wind speed in September
Forsmark, Sweden
- Average wind speed in September: 16.6km/h
The windiest month (with the highest average wind speed) is December (20.3km/h).
The calmest month (with the lowest average wind speed) is July (14.2km/h).
Average humidity in September
Forsmark, Sweden
- Average humidity in September: 79%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are May and June (74%).
Average rainfall in September
Forsmark, Sweden
- Average rainfall in September: 24mm
The wettest month (with the highest rainfall) is July (52mm).
The driest months (with the least rainfall) are February and April (16mm).
Average rainfall days in September
Forsmark, Sweden
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is August (16.5 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Forsmark, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is March (78mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Forsmark, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Forsmark, Sweden
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is June (Average sunshine: 12h and 42min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in September
Forsmark, Sweden
- Average sunshine days in September: 14 days
The month with the most sunshine days is April (15.8 days).
The month with the least sunshine days is December (11.6 days).
Average UV index in September
Forsmark, Sweden
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in September
Forsmark, Sweden
- Average cloud cover in September: 42
The month with the most cloud cover is January (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in September
Forsmark, 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, April, May, November and December (9km).
