September weather forecastGräsö, Sweden
September
Weather in September
The first month of the autumn, September, is also a moderate month in Gräsö, Sweden, with an average temperature ranging between min 11.5°C (52.7°F) and max 15.1°C (59.2°F).Temperature
During the shift to September, a minor reduction in average high-temperature is observed, shifting from a refreshing 18.8°C (65.8°F) in August to a moderate 15.1°C (59.2°F). Gräsö sees a gentle drop from the daily peak temperature in September, with an average low settling at a fresh 11.5°C (52.7°F).Humidity
In Gräsö, the average relative humidity in September is 79%.Rainfall
In Gräsö, in September, during 13.1 rainfall days, 27mm (1.06") of precipitation is typically accumulated. Throughout the year, there are 132.8 rainfall days, and 348mm (13.7") of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 52min.On the first day of September, sunrise is at 05:41 and sunset at 19:50. On the last day of the month, sunrise is at 06:50 and sunset at 18:21 CEST.
Sunshine
In Gräsö, the average sunshine in September is 8.2h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Take precautions - Protection against sun damage is advised. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Gräsö, Sweden
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is August (18.8°C).
The month with the lowest average high temperature is February (0.1°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is August (14.6°C).
The coldest month (with the lowest average low temperature) is February (-2.5°C).
Average pressure in September
Gräsö, Sweden
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1007.1mbar).
Average wind speed in September
Gräsö, Sweden
- Average wind speed in September: 19.3km/h
The windiest month (with the highest average wind speed) is December (24.3km/h).
The calmest month (with the lowest average wind speed) is July (16.3km/h).
Average humidity in September
Gräsö, Sweden
- Average humidity in September: 79%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is May (76%).
Average rainfall in September
Gräsö, Sweden
- Average rainfall in September: 27mm
The wettest month (with the highest rainfall) is July (50mm).
The driest month (with the least rainfall) is April (15mm).
Average rainfall days in September
Gräsö, Sweden
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is August (16.2 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Gräsö, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is March (65mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Gräsö, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Gräsö, Sweden
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 5h and 54min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is June (Average sunshine: 12h and 48min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in September
Gräsö, Sweden
- Average sunshine days in September: 13.6 days
The months with the most sunshine days are April and May (16.3 days).
The month with the least sunshine days is December (11.5 days).
Average UV index in September
Gräsö, 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
Gräsö, Sweden
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Gräsö, Sweden
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, November and December (9km).
