September weather forecastLerum, Sweden
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Lerum, Sweden, with an average temperature ranging between max 16°C (60.8°F) and min 9.8°C (49.6°F).Temperature
With the onset of September, Lerum's climate undergoes a slight change as the average high-temperature moves from a comfortable 19.6°C (67.3°F) in August to a still refreshing 16°C (60.8°F). During September, Lerum's temperature averages to a frosty 9.8°C (49.6°F) at night.Humidity
In September, the average relative humidity in Lerum is 81%.Rainfall
In Lerum, in September, it is raining for 16.4 days, with typically 47mm (1.85") of accumulated precipitation. In Lerum, Sweden, during the entire year, the rain falls for 172.1 days and collects up to 500mm (19.69") of precipitation.Snowfall
June through September are months without snowfall in Lerum.Daylight
In Lerum, Sweden, the average length of the day in September is 12h and 47min.On the first day of September in Lerum, sunrise is at 06:12 and sunset at 20:08. On the last day of the month, sunrise is at 07:14 and sunset at 18:47 CEST.
Sunshine
In September, the average sunshine is 7.4h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 3 in September translates into this advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. 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
Lerum, Sweden
- Average high temperature in September: 16°C
The warmest month (with the highest average high temperature) is July (20.6°C).
The month with the lowest average high temperature is January (0.8°C).
- Average low temperature in September: 9.8°C
The months with the highest average low temperature are July and August (12.3°C).
The coldest month (with the lowest average low temperature) is February (-2.7°C).
Average pressure in September
Lerum, Sweden
- Average pressure in September: 1013.8mbar
The month with the highest atmospheric pressure is April (1014.7mbar).
The month with the lowest atmospheric pressure is December (1008.8mbar).
Average wind speed in September
Lerum, Sweden
- Average wind speed in September: 14km/h
The windiest month (with the highest average wind speed) is December (16.6km/h).
The calmest month (with the lowest average wind speed) is August (12.4km/h).
Average humidity in September
Lerum, Sweden
- Average humidity in September: 81%
The months with the highest relative humidity are January, February and December (89%).
The months with the lowest relative humidity are April and May (73%).
Average rainfall in September
Lerum, Sweden
- Average rainfall in September: 47mm
The wettest month (with the highest rainfall) is August (57mm).
The driest month (with the least rainfall) is April (21mm).
Average rainfall days in September
Lerum, Sweden
- Average rainfall days in September: 16.4 days
The month with the highest number of rainy days is August (19.6 days).
The month with the least rainy days is February (8.9 days).
Average snowfall in September
Lerum, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is January (77mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Lerum, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lerum, Sweden
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 0min).
The month with the shortest days is December (Average daylight: 6h and 42min).
- Average sunshine in September: 7h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 12min).
Average sunshine days in September
Lerum, Sweden
- Average sunshine days in September: 10.5 days
The month with the most sunshine days is April (15.4 days).
The month with the least sunshine days is August (9.2 days).
Average UV index in September
Lerum, Sweden
- Average UV index in September: 3
The months with the highest UV index are May, June and July (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Lerum, Sweden
- Average cloud cover in September: 49
The months with the most cloud cover are February, November and December (Cloud cover 66).
The month with the least cloud cover is June (Cloud cover 41).
Average visibility in September
Lerum, Sweden
- Average visibility in September: 9km
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January and February (8km).
