September weather forecastArnhem, Netherlands
September
Weather in September
As September rolls in, a perceptible shift in the weather is noticeable, indicating the start of autumn in Arnhem. Although the transition to cooler days is gradual, a decrease in daylight and sunshine hours is obvious. Rainfall sees a decrement, recording 16mm (0.63"), down 13mm (0.51") from August. The onset of autumn in September brings about a delightfully moderate yet dynamic weather configuration, appealing to all.Temperature
With the onset of September, Arnhem's climate undergoes a slight change as the average high-temperature moves from an agreeable 22.3°C (72.1°F) in August to a comfortable 18.7°C (65.7°F). In the month of September, Arnhem witnesses a consistent average low-temperature of 10.6°C (51.1°F).Humidity
The average relative humidity in September is 82%.Rainfall
September is the month with the least rainfall in Arnhem. Rain falls for 10.6 days and accumulates 16mm (0.63") of precipitation.Snowfall
In Arnhem, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 39min.On the first day of the month, sunrise is at 06:49 and sunset at 20:23. On the last day of September, in Arnhem, Netherlands, sunrise is at 07:36 and sunset at 19:15 CEST.
Sunshine
In Arnhem, the average sunshine in September is 7.2h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 4 in September translates into this advice:
Be vigilant - Preventing sunburn is recommended. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Arnhem, Netherlands
- Average high temperature in September: 18.7°C
The warmest month (with the highest average high temperature) is July (22.6°C).
The month with the lowest average high temperature is January (4.3°C).
- Average low temperature in September: 10.6°C
The month with the highest average low temperature is August (13.8°C).
The coldest months (with the lowest average low temperature) are January and February (0.8°C).
Average pressure in September
Arnhem, Netherlands
- Average pressure in September: 1017.1mbar
The month with the highest atmospheric pressure is September (1017.1mbar).
The month with the lowest atmospheric pressure is November (1012mbar).
Average wind speed in September
Arnhem, Netherlands
- Average wind speed in September: 11.8km/h
The windiest month (with the highest average wind speed) is December (17.6km/h).
The calmest month (with the lowest average wind speed) is August (11.6km/h).
Average humidity in September
Arnhem, Netherlands
- Average humidity in September: 82%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Arnhem, Netherlands
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is July (37mm).
The driest month (with the least rainfall) is September (16mm).
Average rainfall days in September
Arnhem, Netherlands
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is July (17.9 days).
The months with the least rainy days are October and November (10 days).
Average snowfall in September
Arnhem, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is January (17mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Arnhem, Netherlands
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.3 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
Arnhem, Netherlands
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 7h and 12min
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
Arnhem, Netherlands
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in September
Arnhem, Netherlands
- 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
Arnhem, Netherlands
- Average cloud cover in September: 48
The month with the most cloud cover is December (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 43).
Average visibility in September
Arnhem, Netherlands
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (9km).
The month with the lowest visibility is September (8km).
