September weather forecastGrimsta, Sweden
September
Weather in September
The first month of the autumn, September, is also a moderate month in Grimsta, Sweden, with an average temperature ranging between max 15.4°C (59.7°F) and min 11.4°C (52.5°F).Temperature
The start of September signals a gentle decrease in the average high-temperature, transitioning from a comfortable 19.3°C (66.7°F) in August to a still refreshing 15.4°C (59.7°F). Grimsta observes a slightly reduced average nighttime temperature of 11.4°C (52.5°F) during September.Humidity
In Grimsta, the average relative humidity in September is 79%.Rainfall
In Grimsta, in September, it is raining for 12.5 days, with typically 28mm (1.1") of accumulated precipitation. Throughout the year, in Grimsta, there are 138.3 rainfall days, and 361mm (14.21") of precipitation is accumulated.Snowfall
In Grimsta, Sweden, snow does not fall in June through September.Daylight
In Grimsta, the average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 05:47 and sunset at 19:49. On the last day of September, sunrise is at 06:52 and sunset at 18:24 CEST.
Sunshine
In Grimsta, the average sunshine in September is 8.4h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The daily high UV index of 3 in September translates into this advice:
Be vigilant - Preventing sunburn is recommended. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grimsta, Sweden
- Average high temperature in September: 15.4°C
The warmest month (with the highest average high temperature) is July (19.5°C).
The month with the lowest average high temperature is January (0.7°C).
- Average low temperature in September: 11.4°C
The month with the highest average low temperature is July (14.4°C).
The coldest month (with the lowest average low temperature) is January (-2°C).
Average pressure in September
Grimsta, Sweden
- Average pressure in September: 1013.6mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1008.3mbar).
Average wind speed in September
Grimsta, Sweden
- Average wind speed in September: 18.6km/h
The windiest month (with the highest average wind speed) is December (24.1km/h).
The calmest month (with the lowest average wind speed) is July (16km/h).
Average humidity in September
Grimsta, Sweden
- Average humidity in September: 79%
The months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is May (75%).
Average rainfall in September
Grimsta, Sweden
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is July (42mm).
The driest month (with the least rainfall) is April (16mm).
Average rainfall days in September
Grimsta, Sweden
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is August (14.8 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in September
Grimsta, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is February (70mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Grimsta, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grimsta, Sweden
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 24min).
The month with the shortest days is December (Average daylight: 6h and 18min).
- Average sunshine in September: 8h and 24min
The month with the most sunshine is June (Average sunshine: 12h and 30min).
The month with the least sunshine is December (Average sunshine: 2h and 24min).
Average sunshine days in September
Grimsta, Sweden
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is April (17 days).
The month with the least sunshine days is December (12.1 days).
Average UV index in September
Grimsta, 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 and February (UV index 1).
Average cloud cover in September
Grimsta, Sweden
- Average cloud cover in September: 40
The months with the most cloud cover are January, February and December (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in September
Grimsta, Sweden
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, November and December (9km).
