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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's pleasant 22.4°C (72.3°F) to a comfortable 18.9°C (66°F). Nighttime temperatures hover around an average low of 11°C (51.8°F) in September.Humidity
The average relative humidity in September is 81%.Rainfall
In Altforst, Netherlands, during September, the rain falls for 15.9 days and regularly aggregates up to 39mm (1.54") of precipitation. Throughout the year, in Altforst, there are 203.8 rainfall days, and 547mm (21.54") of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 39min.On the first day of the month, sunrise is at 06:50 and sunset at 20:24. On the last day of September, in Altforst, sunrise is at 07:37 and sunset at 19:17 CEST.
Sunshine
In Altforst, Netherlands, the average sunshine in September is 7.4h.UV index
In Altforst, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Preventative actions are necessary - Recommendations to ward off sunburn are given. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Altforst?
What is the average humidity in September in Altforst?
How much does it rain in Altforst in September?
When it does not snow in Altforst?
What is the average length of the day in September in Altforst?
When is the sunrise / sunset in September in Altforst?
How many hours of sunshine does Altforst have in September?
What is the UV index reading in September in Altforst?
Average temperature in September
Altforst, Netherlands
- Average high temperature in September: 18.9°C
The warmest month (with the highest average high temperature) is July (22.5°C).
The month with the lowest average high temperature is January (4.8°C).
- Average low temperature in September: 11°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 (1.2°C).
Average pressure in September
Altforst, 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
Altforst, 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 (11.5km/h).
Average humidity in September
Altforst, Netherlands
- Average humidity in September: 81%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is April (74%).
Average rainfall in September
Altforst, Netherlands
- Average rainfall in September: 39mm
The wettest month (with the highest rainfall) is July (60mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Altforst, Netherlands
- Average rainfall days in September: 15.9 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is April (14.3 days).
Average snowfall in September
Altforst, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is February (34mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Altforst, Netherlands
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (3.8 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
Altforst, Netherlands
- Average daylight in September: 12h and 4min
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 54min).
- Average sunshine in September: 7h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in September
Altforst, Netherlands
- Average sunshine days in September: 10.8 days
The month with the most sunshine days is April (13.2 days).
The months with the least sunshine days are June and August (8.3 days).
Average UV index in September
Altforst, Netherlands
- 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
Altforst, Netherlands
- Average cloud cover in September: 46
The month with the most cloud cover is December (Cloud cover 65).
The months with the least cloud cover are April and August (Cloud cover 42).
Average visibility in September
Altforst, 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).
Altforst, Netherlands
Weather forecast for your location
2. Allow the app to use your location