September weather forecast
Raperswilen, Switzerland

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September

Weather in September

The first month of the autumn, September, is still a comfortable month in Raperswilen, Switzerland, with an average temperature ranging between min 7.9°C (46.2°F) and max 18.6°C (65.5°F).

Temperature

September is characterized by a slight reduction in average high-temperature, easing from a warm 23.3°C (73.9°F) in August to a comfortable 18.6°C (65.5°F). In Raperswilen, an average nighttime temperature of 7.9°C (46.2°F) is expected during September.

Humidity

The average relative humidity in September in Raperswilen, Switzerland, is 82%.

Rainfall

In Raperswilen, in September, it is raining for 13.7 days, with typically 31mm (1.22") of accumulated precipitation. Throughout the year, in Raperswilen, there are 177.1 rainfall days, and 516mm (20.31") of precipitation is accumulated.

Snowfall

In Raperswilen, snow does not fall in June through September.

Daylight

The average length of the day in September in Raperswilen is 12h and 34min.
On the first day of September, sunrise is at 06:43 and sunset at 20:04. On the last day of the month, sunrise is at 07:22 and sunset at 19:05 CEST.

Sunshine

In September, the average sunshine in Raperswilen is 8.7h.

UV index

In Raperswilen, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in September transforms into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Updated: Feb 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Raperswilen in September?
The high-temperature, in September, in Raperswilen, is 18.6°C (65.5°F), while the low-temperature averages to 7.9°C (46.2°F).
What is the average humidity in September in Raperswilen?
In Raperswilen, Switzerland, the average relative humidity in September is 82%.
How many days does it rain in September in Raperswilen?
In Raperswilen, Switzerland, in September, it is raining for 13.7 days, with typically 31mm (1.22") of accumulated precipitation.
When it does not snow in Raperswilen?
June through September are months without snowfall in Raperswilen.
Does it snow in Raperswilen in September?
In Raperswilen, in September, it doesn't snow. In October, it regularly snows.
What is the average length of the day in September in Raperswilen?
In September, the average day length is 12h and 34min.
When is the sunrise / sunset in September in Raperswilen?
On the first day of September in Raperswilen, Switzerland, sunrise is at 06:43 and sunset at 20:04. On the last day of the month, sunrise is at 07:22 and sunset at 19:05 CEST.
How many hours of sunshine does Raperswilen have in September?
The average sunshine duration in September in Raperswilen, Switzerland, is 8.7h.
How high is the UV index in September in Raperswilen?
In September, the average daily maximum UV index in Raperswilen, Switzerland, is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
23.3°C
18.6°C
13.6°C
Average low temperature
11.8°C
7.9°C
4.5°C
Average pressure
1017.6mbar
1018.7mbar
1018.6mbar
Average wind speed
6.4km/h
6.8km/h
6.8km/h
Average max. wind speed
7.1km/h
7.2km/h
7.5km/h
Average wind speed gusts
10.1km/h
11km/h
11.3km/h
Average humidity
80%
82%
85%
Average rainfall
71mm
31mm
35mm
Average rainfall days
18.3
13.7
11.9
Average snowfall
0mm
0mm
3mm
Average snowfall days
0
0.1
0.3
Average daylight
14h 1min
12h 4min
10h 5min
Average sunshine
10h 1min
8h 4min
5h 5min
Average sunshine days
9.1
14.2
16.7
Average UV index
4
4
2
Average cloud cover
34%
39%
45%
Average visibility
8km
8km
7km
Average temperature in September
Raperswilen, Switzerland
  • Average high temperature in September: 18.6°C

The warmest month (with the highest average high temperature) is July (23.6°C).
The month with the lowest average high temperature is January (2.6°C).

  • Average low temperature in September: 7.9°C

The month with the highest average low temperature is August (11.8°C).
The coldest month (with the lowest average low temperature) is January (-3.4°C).

Average pressure in September
Raperswilen, Switzerland
  • Average pressure in September: 1018.7mbar

The month with the highest atmospheric pressure is December (1020.6mbar).
The months with the lowest atmospheric pressure are April and November (1015.7mbar).

Average wind speed in September
Raperswilen, Switzerland
  • Average wind speed in September: 6.8km/h

The windiest month (with the highest average wind speed) is March (9.4km/h).
The calmest month (with the lowest average wind speed) is August (6.4km/h).

Average humidity in September
Raperswilen, Switzerland
  • Average humidity in September: 82%

The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are April and July (78%).

Average rainfall in September
Raperswilen, Switzerland
  • Average rainfall in September: 31mm

The wettest month (with the highest rainfall) is August (71mm).
The driest month (with the least rainfall) is January (29mm).

Average rainfall days in September
Raperswilen, Switzerland
  • Average rainfall days in September: 13.7 days

The month with the highest number of rainy days is May (21.8 days).
The month with the least rainy days is February (10.1 days).

Average snowfall in September
Raperswilen, Switzerland
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (88mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September
Raperswilen, Switzerland
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is February (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
Raperswilen, 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 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).

Average sunshine days in September
Raperswilen, Switzerland
  • Average sunshine days in September: 14.2 days

The month with the most sunshine days is October (16.7 days).
The month with the least sunshine days is June (7.3 days).

Average UV index in September
Raperswilen, Switzerland
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).

Average cloud cover in September
Raperswilen, Switzerland
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 34).

Average visibility in September
Raperswilen, Switzerland
  • Average visibility in September: 8km

The months with the highest visibility are March, April, May, June, July, August and September (8km).
The months with the lowest visibility are January, February, October, November and December (7km).

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