Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from a warm 23.3°C (73.9°F) to a refreshing 19.7°C (67.5°F). Nighttime temperature dips to a mean of 11°C (51.8°F) during September.Humidity
In Demer, the average relative humidity in September is 78%.Rainfall
The month with the least rainfall is September, when the rain falls for 9.9 days and typically collects 20mm (0.79") of precipitation.Snowfall
In Demer, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 06:54 and sunset at 20:25. On the last day of September, in Demer, sunrise is at 07:40 and sunset at 19:20 CEST.
Sunshine
In Demer, the average sunshine in September is 7.4h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Frequently asked questions
What are September temperatures in Demer?
What is the average humidity in September in Demer?
What is the driest month in Demer?
How many days does it rain in September in Demer?
When it does not snow in Demer?
How many hours of daylight does Demer have in September?
When is the sunrise / sunset in September in Demer?
How long on average sun shines in September in Demer?
What is the UV index intensity in September in Demer?
Average temperature in September
Demer, Belgium
- Average high temperature in September: 19.7°C
The warmest month (with the highest average high temperature) is July (23.4°C).
The month with the lowest average high temperature is January (5.2°C).
- Average low temperature in September: 11°C
The month with the highest average low temperature is August (14°C).
The coldest months (with the lowest average low temperature) are January and February (1.3°C).
Average pressure in September
Demer, 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 (1012.6mbar).
Average wind speed in September
Demer, Belgium
- Average wind speed in September: 11.8km/h
The windiest month (with the highest average wind speed) is December (17.9km/h).
The calmest month (with the lowest average wind speed) is August (11.5km/h).
Average humidity in September
Demer, Belgium
- Average humidity in September: 78%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is April (74%).
Average rainfall in September
Demer, Belgium
- Average rainfall in September: 20mm
The wettest month (with the highest rainfall) is December (57mm).
The driest month (with the least rainfall) is September (20mm).
Average rainfall days in September
Demer, Belgium
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is December (17.5 days).
The month with the least rainy days is September (9.9 days).
Average snowfall in September
Demer, Belgium
- Average snowfall in September: 0mm
The month with the highest snowfall is February (41mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Demer, Belgium
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (4.7 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
Demer, Belgium
- Average daylight in September: 12h and 4min
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 2min
The month with the most sunshine is July (Average sunshine: 8h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in September
Demer, Belgium
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is September (18.4 days).
The month with the least sunshine days is December (8.8 days).
Average UV index in September
Demer, 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
Demer, Belgium
- Average cloud cover in September: 44
The month with the most cloud cover is December (Cloud cover 64).
The months with the least cloud cover are April and August (Cloud cover 42).
Average visibility in September
Demer, 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).
Demer, Belgium
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