September weather forecastTrosa, Sweden
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Trosa, Sweden, with temperature in the range of an average high of 16.5°C (61.7°F) and an average low of 9.3°C (48.7°F).Temperature
As August makes way for September, Trosa's average high-temperature eases from an agreeable 21.1°C (70°F) to a refreshing 16.5°C (61.7°F). The nighttime temperature dips to a frosty 9.3°C (48.7°F) on average during September.Humidity
The average relative humidity in September is 79%.Rainfall
In Trosa, in September, during 12.5 rainfall days, 28mm (1.1") of precipitation is typically accumulated. In Trosa, during the entire year, the rain falls for 143.7 days and collects up to 387mm (15.24") of precipitation.Snowfall
In Trosa, Sweden, snow does not fall in June through September.Sea temperature
In September, the average sea temperature is 14.8°C (58.6°F).Note: You can swim in 14.8°C (58.6°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
The average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 05:48 and sunset at 19:50. On the last day of September, sunrise is at 06:53 and sunset at 18:25 CEST.
Sunshine
In Trosa, Sweden, the average sunshine in September is 8.1h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Trosa, Sweden
- Average high temperature in September: 16.5°C
The warmest month (with the highest average high temperature) is July (22.1°C).
The month with the lowest average high temperature is January (-0.6°C).
- Average low temperature in September: 9.3°C
The month with the highest average low temperature is July (12.8°C).
The coldest month (with the lowest average low temperature) is January (-3.9°C).
Average pressure in September
Trosa, Sweden
- Average pressure in September: 1013.5mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008.1mbar).
Average wind speed in September
Trosa, Sweden
- Average wind speed in September: 12.9km/h
The windiest month (with the highest average wind speed) is December (16km/h).
The calmest month (with the lowest average wind speed) is August (11.5km/h).
Average humidity in September
Trosa, Sweden
- Average humidity in September: 79%
The months with the highest relative humidity are January, February, November and December (89%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Trosa, Sweden
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is October (41mm).
The driest month (with the least rainfall) is April (18mm).
Average rainfall days in September
Trosa, Sweden
- Average rainfall days in September: 12.5 days
The months with the highest number of rainy days are July and August (14.6 days).
The month with the least rainy days is February (7.1 days).
Average snowfall in September
Trosa, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is January (110mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Trosa, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Trosa, Sweden
- Average sea temperature in September: 14.8°C
The best month for swimming (with the highest average sea temperature) is August (18.7°C).
The coldest month (with the lowest average sea temperature) is February (1°C).
Average daylight in September /
Average sunshine in September
Trosa, Sweden
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 18min).
The month with the shortest days is December (Average daylight: 6h and 24min).
- Average sunshine in September: 8h and 6min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 2h and 30min).
Average sunshine days in September
Trosa, Sweden
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is April (14.6 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in September
Trosa, Sweden
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Trosa, Sweden
- Average cloud cover in September: 44
The months with the most cloud cover are February and December (Cloud cover 67).
The months with the least cloud cover are June, July and August (Cloud cover 40).
Average visibility in September
Trosa, Sweden
- Average visibility in September: 9km
The months with the highest visibility are April, May, June, July, August, September and October (9km).
The months with the lowest visibility are January, February, March, November and December (8km).
