September weather forecastZwolle, Netherlands
September
Weather in September
The arrival of September decreases the temperature, and the average high falls to 18.5°C (65.3°F) while the average low goes to 10.9°C (51.6°F). A decrease in humidity by 77% implies drier weather in Zwolle, Netherlands. The data showcases a slight surge in UV index, hinting towards the persistent sunshine. The wind starts picking up again, making weather conditions more refreshing and less warm. September bridges the gap between the contrasting climatological conditions of summer and winter.Temperature
September's arrival in Zwolle, Netherlands, aligns with a minor decrease in average high-temperatures, from August's agreeable 22.3°C (72.1°F) to a comfortable 18.5°C (65.3°F). Zwolle, during the nights of September, experiences an average temperature drop to a cool 10.9°C (51.6°F).Humidity
The average relative humidity in September in Zwolle is 83%.Rainfall
In Zwolle, in September, during 9.3 rainfall days, 13mm (0.51") of precipitation is typically accumulated. In Zwolle, during the entire year, the rain falls for 129.5 days and collects up to 203mm (7.99") of precipitation.Snowfall
April through November are months without snowfall in Zwolle.Daylight
In September, the average length of the day is 12h and 40min.On the first day of the month, sunrise is at 06:47 and sunset at 20:23. On the last day of September, sunrise is at 07:36 and sunset at 19:14 CEST.
Sunshine
The average sunshine in September in Zwolle is 7.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 4 during September leads to these advisories:
Put precautions into practice - Ensuring skin and eye safety is a necessity. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Zwolle, Netherlands
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is August (22.3°C).
The month with the lowest average high temperature is January (4.6°C).
- Average low temperature in September: 10.9°C
The month with the highest average low temperature is August (13.5°C).
The coldest month (with the lowest average low temperature) is February (0.8°C).
Average pressure in September
Zwolle, Netherlands
- Average pressure in September: 1016.8mbar
The month with the highest atmospheric pressure is September (1016.8mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).
Average wind speed in September
Zwolle, Netherlands
- Average wind speed in September: 12.5km/h
The windiest month (with the highest average wind speed) is December (18.5km/h).
The calmest months (with the lowest average wind speed) are July and August (12.3km/h).
Average humidity in September
Zwolle, Netherlands
- Average humidity in September: 83%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Zwolle, Netherlands
- Average rainfall in September: 13mm
The wettest month (with the highest rainfall) is June (25mm).
The driest month (with the least rainfall) is April (10mm).
Average rainfall days in September
Zwolle, Netherlands
- Average rainfall days in September: 9.3 days
The month with the highest number of rainy days is July (13.9 days).
The month with the least rainy days is October (8.9 days).
Average snowfall in September
Zwolle, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is January (11mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Zwolle, Netherlands
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.9 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
Zwolle, Netherlands
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 7h and 6min
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
Zwolle, Netherlands
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is October (19.3 days).
The month with the least sunshine days is June (13.3 days).
Average UV index in September
Zwolle, 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, March, November and December (UV index 2).
Average cloud cover in September
Zwolle, Netherlands
- Average cloud cover in September: 48
The month with the most cloud cover is December (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 43).
Average visibility in September
Zwolle, 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).
