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
September
Weather in September
Temperature
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's agreeable 22.3°C (72.1°F) to a refreshing 18.8°C (65.8°F). Alle's nights in September cool down to an average low-temperature of 9.7°C (49.5°F).Humidity
In September, the average relative humidity is 81%.Rainfall
In September, the rain falls for 13.2 days. Throughout September, 44mm (1.73") of precipitation is accumulated. In Alle, during the entire year, the rain falls for 190.4 days and collects up to 641mm (25.24") of precipitation.Snowfall
May through September are months without snowfall in Alle.Daylight
In September, the average length of the day in Alle is 12h and 37min.On the first day of September in Alle, Belgium, sunrise is at 06:56 and sunset at 20:23. On the last day of the month, sunrise is at 07:39 and sunset at 19:20 CEST.
Sunshine
In Alle, the average sunshine in September is 7.6h.UV index
The average daily maximum UV index in September in Alle is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Alle in September?
What is the average humidity in September in Alle?
How much does it rain in Alle in September?
When it does not snow in Alle?
Does it snow in Alle in September?
What is the average length of the day in September in Alle?
When is the sunrise / sunset in September in Alle?
How long on average sun shines in September in Alle?
What is the UV index reading in September in Alle?
Average temperature in September
Alle, Belgium
- Average high temperature in September: 18.8°C
The warmest months (with the highest average high temperature) are July and August (22.3°C).
The month with the lowest average high temperature is January (3.9°C).
- Average low temperature in September: 9.7°C
The month with the highest average low temperature is August (12.6°C).
The coldest month (with the lowest average low temperature) is January (-0.1°C).
Average pressure in September
Alle, Belgium
- Average pressure in September: 1017.7mbar
The months with the highest atmospheric pressure are September and December (1017.7mbar).
The month with the lowest atmospheric pressure is November (1013.4mbar).
Average wind speed in September
Alle, Belgium
- Average wind speed in September: 10.3km/h
The windiest month (with the highest average wind speed) is February (15.8km/h).
The calmest month (with the lowest average wind speed) is August (9.8km/h).
Average humidity in September
Alle, Belgium
- Average humidity in September: 81%
The month with the highest relative humidity is December (92%).
The month with the lowest relative humidity is August (78%).
Average rainfall in September
Alle, Belgium
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is December (80mm).
The driest month (with the least rainfall) is April (35mm).
Average rainfall days in September
Alle, Belgium
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is December (18.4 days).
The month with the least rainy days is February (13 days).
Average snowfall in September
Alle, Belgium
- Average snowfall in September: 0mm
The month with the highest snowfall is January (56mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Alle, 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 and September (0 days).
Average daylight in September /
Average sunshine in September
Alle, Belgium
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 18min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 6min).
The month with the least sunshine is December (Average sunshine: 3h and 18min).
Average sunshine days in September
Alle, Belgium
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is September (14.4 days).
The month with the least sunshine days is December (9.5 days).
Average UV index in September
Alle, Belgium
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Alle, Belgium
- Average cloud cover in September: 42
The month with the most cloud cover is December (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in September
Alle, Belgium
- Average visibility in September: 8km
The months with the highest visibility are March, April and August (9km).
The months with the lowest visibility are January, February, May, June, July, September, October, November and December (8km).
