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
In the transition to September, Halden observes a minor drop in the average high-temperature, shifting from an agreeable 22.8°C (73°F) in August to a comfortable 18.4°C (65.1°F). In the month of September, Halden records a consistent average low-temperature of 8.1°C (46.6°F).Humidity
The average relative humidity in September in Halden is 79%.Rainfall
In Halden, in September, during 13.5 rainfall days, 58mm (2.28") of precipitation is typically accumulated. In Halden, Switzerland, during the entire year, the rain falls for 160.7 days and collects up to 928mm (36.54") of precipitation.Snowfall
Months with snowfall in Halden are January through May, September through December. September is the first month it typically snows in Halden, Switzerland. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, in Halden, there are 48.4 snowfall days, and 1205mm (47.44") of snow is accumulated.Daylight
In Halden, the average length of the day in September is 12h and 34min.On the first day of September in Halden, sunrise is at 06:41 and sunset at 20:02. On the last day of the month, sunrise is at 07:20 and sunset at 19:03 CEST.
Sunshine
In September, the average sunshine is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Undertake precautions - It is suggested to shield oneself from sunburn. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Halden in September?
What is the average humidity in September in Halden?
How many days does it rain in September in Halden?
When does it start to snow in Halden?
How many hours of daylight does Halden have in September?
When are sunrise and sunset in September in Halden?
How long on average sun shines in September in Halden?
How high is the UV index in September in Halden?
Average temperature in September
Halden, Switzerland
- Average high temperature in September: 18.4°C
The warmest month (with the highest average high temperature) is July (22.9°C).
The month with the lowest average high temperature is January (2.5°C).
- Average low temperature in September: 8.1°C
The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is February (-3.8°C).
Average pressure in September
Halden, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.7mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed in September
Halden, Switzerland
- Average wind speed in September: 6.9km/h
The windiest month (with the highest average wind speed) is March (8.9km/h).
The calmest month (with the lowest average wind speed) is August (6.8km/h).
Average humidity in September
Halden, Switzerland
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April and July (75%).
Average rainfall in September
Halden, Switzerland
- Average rainfall in September: 58mm
The wettest month (with the highest rainfall) is August (113mm).
The driest month (with the least rainfall) is April (43mm).
Average rainfall days in September
Halden, Switzerland
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in September
Halden, Switzerland
- Average snowfall in September: 1mm
The month with the highest snowfall is January (337mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Halden, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Halden, Switzerland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in September
Halden, Switzerland
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in September
Halden, Switzerland
- 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
Halden, Switzerland
- Average cloud cover in September: 37
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Halden, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are April, May, June, July and August (9km).
The months with the lowest visibility are January, February, March, September, October, November and December (8km).
