September weather forecast
Heimiswil, Switzerland

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September

Weather in September

The first month of the autumn, September, is still a comfortable month in Heimiswil, Switzerland, with an average temperature ranging between max 18.3°C (64.9°F) and min 7.5°C (45.5°F).

Temperature

In September, the meteorological conditions change slightly, with the average high-temperature moving from an agreeable 22.3°C (72.1°F) in August to a refreshing 18.3°C (64.9°F). September nights in Heimiswil, Switzerland, observe an average temperature dip to a frosty 7.5°C (45.5°F).

Humidity

In Heimiswil, the average relative humidity in September is 81%.

Rainfall

September is the month with the least rainfall in Heimiswil, Switzerland. Rain falls for 12.8 days and accumulates 37mm (1.46") of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day in September in Heimiswil is 12h and 34min.
On the first day of the month, sunrise is at 06:49 and sunset at 20:09. On the last day of September, in Heimiswil, sunrise is at 07:27 and sunset at 19:10 CEST.

Sunshine

In September, the average sunshine is 8.8h.

UV index

In Heimiswil, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A typical high UV index of 4 in September suggests the following recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Updated: Feb 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September in Heimiswil?
The high-temperature, in September, in Heimiswil, is 18.3°C (64.9°F), while the low-temperature averages to 7.5°C (45.5°F).
What is the average humidity in September in Heimiswil?
The average relative humidity in September in Heimiswil is 81%.
What is the driest month in Heimiswil?
The month with the least rainfall in Heimiswil, Switzerland, is September, when the rain falls for 12.8 days and typically collects 37mm (1.46") of precipitation.
How much does it rain in Heimiswil in September?
In Heimiswil, Switzerland, in September, during 12.8 rainfall days, 37mm (1.46") of precipitation is typically accumulated.
When it does not snow in Heimiswil?
June through September are months without snowfall.
Does it snow in Heimiswil in September?
In Heimiswil, in September, it doesn't snow. In October, it regularly snows.
How many hours of daylight does Heimiswil have in September?
In Heimiswil, Switzerland, the average day length in September is 12h and 34min.
When are sunrise and sunset in September in Heimiswil?
On the first day of September in Heimiswil, Switzerland, sunrise is at 06:49 and sunset at 20:09. On the last day of the month, sunrise is at 07:27 and sunset at 19:10 CEST.
How many hours of sunshine does Heimiswil have in September?
In Heimiswil, the average sunshine duration in September is 8.8h.
What is the UV index intensity in September in Heimiswil?
In Heimiswil, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
22.3°C
18.3°C
13.5°C
Average low temperature
11.2°C
7.5°C
4.5°C
Average pressure
1017.8mbar
1018.6mbar
1018.6mbar
Average wind speed
6.1km/h
6.5km/h
6.6km/h
Average max. wind speed
6.8km/h
7km/h
7.2km/h
Average wind speed gusts
9.8km/h
10.6km/h
11.2km/h
Average humidity
78%
81%
81%
Average rainfall
84mm
37mm
54mm
Average rainfall days
16.5
12.8
10.8
Average snowfall
0mm
0mm
52mm
Average snowfall days
0
0
1.9
Average daylight
14h 1min
12h 4min
10h 5min
Average sunshine
10h 2min
8h 5min
6h 2min
Average sunshine days
10.8
14.2
17.4
Average UV index
4
4
2
Average cloud cover
32%
35%
37%
Average visibility
8km
8km
8km
Average temperature in September
Heimiswil, Switzerland
  • Average high temperature in September: 18.3°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 (2.3°C).

  • Average low temperature in September: 7.5°C

The month with the highest average low temperature is July (11.4°C).
The coldest month (with the lowest average low temperature) is February (-4.3°C).

Average pressure in September
Heimiswil, Switzerland
  • Average pressure in September: 1018.6mbar

The month with the highest atmospheric pressure is December (1021mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).

Average wind speed in September
Heimiswil, Switzerland
  • Average wind speed in September: 6.5km/h

The windiest month (with the highest average wind speed) is March (8.6km/h).
The calmest month (with the lowest average wind speed) is August (6.1km/h).

Average humidity in September
Heimiswil, Switzerland
  • Average humidity in September: 81%

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is July (77%).

Average rainfall in September
Heimiswil, Switzerland
  • Average rainfall in September: 37mm

The wettest month (with the highest rainfall) is June (99mm).
The driest month (with the least rainfall) is September (37mm).

Average rainfall days in September
Heimiswil, Switzerland
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is February (8.4 days).

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

The month with the highest snowfall is January (269mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September
Heimiswil, Switzerland
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Heimiswil, Switzerland
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).

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

The month with the most sunshine days is October (17.4 days).
The month with the least sunshine days is June (8.3 days).

Average UV index in September
Heimiswil, 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, October, November and December (UV index 2).

Average cloud cover in September
Heimiswil, Switzerland
  • Average cloud cover in September: 35

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 32).

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

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

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