September weather forecastOlen, Belgium
September
Weather in September
September, the first month of the autumn in Olen, is still a comfortable month, with an average temperature varying between 19.5°C (67.1°F) and 11.3°C (52.3°F).Temperature
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a moderately hot 23.1°C (73.6°F) in August to an enjoyable 19.5°C (67.1°F). In Olen, the average temperature during the nights of September drops to a cool 11.3°C (52.3°F).Humidity
The average relative humidity in September in Olen is 79%.Rainfall
In Olen, during September, the rain falls for 12.5 days and regularly aggregates up to 24mm (0.94") of precipitation. In Olen, during the entire year, the rain falls for 179.1 days and collects up to 451mm (17.76") of precipitation.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 38min.On the first day of the month, sunrise is at 06:54 and sunset at 20:26. On the last day of September, in Olen, sunrise is at 07:40 and sunset at 19:20 CEST.
Sunshine
In September, the average sunshine is 7.6h.UV index
The average daily maximum UV index in September in Olen is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Exercise prevention - Precautions against solar damage are endorsed. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Olen, Belgium
- Average high temperature in September: 19.5°C
The warmest month (with the highest average high temperature) is July (23.3°C).
The month with the lowest average high temperature is January (5.2°C).
- Average low temperature in September: 11.3°C
The month with the highest average low temperature is August (14.3°C).
The coldest months (with the lowest average low temperature) are January and February (1.4°C).
Average pressure in September
Olen, Belgium
- Average pressure in September: 1017.4mbar
The month with the highest atmospheric pressure is September (1017.4mbar).
The month with the lowest atmospheric pressure is November (1012.3mbar).
Average wind speed in September
Olen, Belgium
- Average wind speed in September: 11.8km/h
The windiest month (with the highest average wind speed) is December (17.5km/h).
The calmest month (with the lowest average wind speed) is August (11.6km/h).
Average humidity in September
Olen, Belgium
- Average humidity in September: 79%
The month with the highest relative humidity is December (87%).
The months with the lowest relative humidity are April and August (74%).
Average rainfall in September
Olen, Belgium
- Average rainfall in September: 24mm
The wettest month (with the highest rainfall) is June (51mm).
The driest month (with the least rainfall) is April (22mm).
Average rainfall days in September
Olen, Belgium
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (17.6 days).
The months with the least rainy days are February and September (12.5 days).
Average snowfall in September
Olen, Belgium
- Average snowfall in September: 0mm
The month with the highest snowfall is February (26mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Olen, Belgium
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Olen, Belgium
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 30min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in September: 7h and 36min
The month with the most sunshine is July (Average sunshine: 9h and 6min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days in September
Olen, Belgium
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is September (15.5 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in September
Olen, Belgium
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Olen, Belgium
- Average cloud cover in September: 43
The month with the most cloud cover is December (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 41).
Average visibility in September
Olen, Belgium
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
