September weather forecast
Flums, Switzerland

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September

Weather in September

September, the first month of the autumn in Flums, is also an enjoyable month, with temperature in the range of an average high of 16.8°C (62.2°F) and an average low of 6°C (42.8°F).

Temperature

The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's agreeable 21°C (69.8°F) to an enjoyable 16.8°C (62.2°F). Throughout the month of September, Flums witnesses an average low-temperature of 6°C (42.8°F).

Humidity

In Flums, the average relative humidity in September is 79%.

Rainfall

In September, in Flums, the rain falls for 13.8 days. Throughout September, 55mm (2.17") of precipitation is accumulated. In Flums, during the entire year, the rain falls for 149.5 days and collects up to 983mm (38.7") of precipitation.

Snowfall

January through May, September through December are months with snowfall in Flums. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, in Flums, there are 80 snowfall days, and 2699mm (106.26") of snow is accumulated.

Daylight

The average length of the day in September in Flums, Switzerland, is 12h and 34min.
On the first day of the month, sunrise is at 06:42 and sunset at 20:02. On the last day of September, in Flums, sunrise is at 07:20 and sunset at 19:04 CEST.

Sunshine

The average sunshine in September is 9.3h.

UV index

The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 3 transforms into these recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
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 Flums?
In September, the average high-temperature and low-temperature in Flums, Switzerland, are 16.8°C (62.2°F) and 6°C (42.8°F) respectively.
What is the average humidity in September in Flums?
In Flums, the average relative humidity in September is 79%.
How many days does it rain in September in Flums?
In Flums, Switzerland, during September, the rain falls for 13.8 days and regularly aggregates up to 55mm (2.17") of precipitation.
When does it start snowing in Flums?
September is the first month it typically snows in Flums. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow.
What is the average length of the day in September in Flums?
In Flums, the average day length in September is 12h and 34min.
When are sunrise and sunset in September in Flums?
On the first day of September in Flums, sunrise is at 06:42 and sunset at 20:02. On the last day of the month, sunrise is at 07:20 and sunset at 19:04 CEST.
How many hours of sunshine does Flums have in September?
The average sunshine duration in September in Flums is 9.3h.
What is the UV index reading in September in Flums?
The average daily maximum UV index in September in Flums is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
21°C
16.8°C
12.5°C
Average low temperature
9.4°C
6°C
2.7°C
Average pressure
1017.8mbar
1018.5mbar
1018.6mbar
Average wind speed
6.5km/h
6.5km/h
7.1km/h
Average max. wind speed
7.2km/h
6.8km/h
7.8km/h
Average wind speed gusts
10.6km/h
10.6km/h
12.4km/h
Average humidity
77%
79%
80%
Average rainfall
115mm
55mm
72mm
Average rainfall days
16.8
13.8
9.9
Average snowfall
0mm
1mm
142mm
Average snowfall days
0
0.1
3.7
Average daylight
14h 1min
12h 4min
10h 5min
Average sunshine
10h 2min
9h 2min
6h 3min
Average sunshine days
12.6
14.6
17
Average UV index
4
3
3
Average cloud cover
32%
35%
33%
Average visibility
9km
8km
8km
Average temperature in September
Flums, Switzerland
  • Average high temperature in September: 16.8°C

The warmest month (with the highest average high temperature) is August (21°C).
The month with the lowest average high temperature is January (0.8°C).

  • Average low temperature in September: 6°C

The month with the highest average low temperature is August (9.4°C).
The coldest month (with the lowest average low temperature) is February (-7.4°C).

Average pressure in September
Flums, Switzerland
  • Average pressure in September: 1018.5mbar

The month with the highest atmospheric pressure is December (1020.8mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).

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

The windiest month (with the highest average wind speed) is December (8km/h).
The calmest months (with the lowest average wind speed) are August and September (6.5km/h).

Average humidity in September
Flums, Switzerland
  • Average humidity in September: 79%

The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is July (76%).

Average rainfall in September
Flums, Switzerland
  • Average rainfall in September: 55mm

The wettest month (with the highest rainfall) is August (115mm).
The driest month (with the least rainfall) is April (52mm).

Average rainfall days in September
Flums, Switzerland
  • Average rainfall days in September: 13.8 days

The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is February (6.2 days).

Average snowfall in September
Flums, Switzerland
  • Average snowfall in September: 1mm

The month with the highest snowfall is January (613mm).
The months with the least snowfall are June, July and August (0mm).

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

The month with the highest number of snowfall days is January (15.9 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in September /
Average sunshine in September
Flums, 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: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 36min).

Average sunshine days in September
Flums, Switzerland
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is October (17 days).
The month with the least sunshine days is May (8.3 days).

Average UV index in September
Flums, Switzerland
  • Average UV index in September: 3

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
Flums, Switzerland
  • Average cloud cover in September: 35

The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 32).

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

The months with the highest visibility are June, July and August (9km).
The months with the lowest visibility are January and February (7km).

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