September weather forecastSumar, Netherlands
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Sumar, Netherlands, with an average temperature ranging between max 18°C (64.4°F) and min 11.7°C (53.1°F).Temperature
September sees a slight reduction in average high-temperature, with a shift from an agreeable 21.3°C (70.3°F) in August to a comfortable 18°C (64.4°F). September nights cool down to an average low-temperature of 11.7°C (53.1°F).Humidity
The average relative humidity in September is 82%.Rainfall
In Sumar, Netherlands, in September, during 14.7 rainfall days, 30mm (1.18") of precipitation is typically accumulated. Throughout the year, there are 193.8 rainfall days, and 494mm (19.45") of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day in Sumar is 12h and 41min.On the first day of September in Sumar, sunrise is at 06:46 and sunset at 20:24. On the last day of the month, sunrise is at 07:36 and sunset at 19:14 CEST.
Sunshine
In September, the average sunshine in Sumar is 7.1h.UV index
The average daily maximum UV index in September in Sumar is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Take precautions - Protection against sunburn is recommended. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. 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
Sumar, Netherlands
- Average high temperature in September: 18°C
The warmest month (with the highest average high temperature) is August (21.3°C).
The month with the lowest average high temperature is January (4.8°C).
- Average low temperature in September: 11.7°C
The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is February (1.3°C).
Average pressure in September
Sumar, Netherlands
- Average pressure in September: 1016.4mbar
The months with the highest atmospheric pressure are May and September (1016.4mbar).
The month with the lowest atmospheric pressure is November (1010.9mbar).
Average wind speed in September
Sumar, Netherlands
- Average wind speed in September: 15.1km/h
The windiest month (with the highest average wind speed) is December (21.7km/h).
The calmest month (with the lowest average wind speed) is July (14.3km/h).
Average humidity in September
Sumar, Netherlands
- Average humidity in September: 82%
The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is April (78%).
Average rainfall in September
Sumar, Netherlands
- Average rainfall in September: 30mm
The wettest month (with the highest rainfall) is July (52mm).
The driest month (with the least rainfall) is April (26mm).
Average rainfall days in September
Sumar, Netherlands
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is July (19.8 days).
The month with the least rainy days is April (13.8 days).
Average snowfall in September
Sumar, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is February (26mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Sumar, Netherlands
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.8 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
Sumar, Netherlands
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 7h and 6min
The month with the most sunshine is July (Average sunshine: 9h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 18min).
Average sunshine days in September
Sumar, Netherlands
- Average sunshine days in September: 13.1 days
The month with the most sunshine days is October (14.5 days).
The month with the least sunshine days is December (8.5 days).
Average UV index in September
Sumar, Netherlands
- Average UV index in September: 4
The month with the highest UV index is 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
Sumar, Netherlands
- Average cloud cover in September: 47
The month with the most cloud cover is December (Cloud cover 68).
The months with the least cloud cover are April and August (Cloud cover 41).
Average visibility in September
Sumar, Netherlands
- 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).
