September weather forecast
Romanshorn, Switzerland

Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Contents

September

Weather in September

The first month of the autumn, September, is still a comfortable month in Romanshorn, Switzerland, with an average temperature varying between 8.6°C (47.5°F) and 18.6°C (65.5°F).

Temperature

The arrival of September corresponds with a light shift in temperature, down from a warm 23°C (73.4°F) in August to a refreshing 18.6°C (65.5°F). Romanshorn observes an average low-temperature of 8.6°C (47.5°F) during September nights.

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Romanshorn, in September, during 14.3 rainfall days, 57mm (2.24") of precipitation is typically accumulated. Throughout the year, in Romanshorn, there are 177.8 rainfall days, and 1006mm (39.61") of precipitation is accumulated.

Snowfall

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

Daylight

In September, the average length of the day is 12h and 34min.
On the first day of the month, sunrise is at 06:41 and sunset at 20:02. On the last day of September, sunrise is at 07:20 and sunset at 19:03 CEST.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In Romanshorn, Switzerland, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Updated: Feb 3, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Romanshorn in September?
In Romanshorn, 18.6°C (65.5°F) is the average high-temperature and 8.6°C (47.5°F) is the average low-temperature during September.
What is the average humidity in September in Romanshorn?
In Romanshorn, the average relative humidity in September is 78%.
How many days does it rain in September in Romanshorn?
In Romanshorn, in September, it is raining for 14.3 days, with typically 57mm (2.24") of accumulated precipitation.
When it does not snow in Romanshorn?
In Romanshorn, Switzerland, snow does not fall in June through September.
Does it snow in Romanshorn in September?
In Romanshorn, in September, it doesn't snow. In October, it regularly snows.
What is the average length of the day in September in Romanshorn?
In Romanshorn, Switzerland, the average day length in September is 12h and 34min.
When are sunrise and sunset in September in Romanshorn?
On the first day of September in Romanshorn, Switzerland, 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.
How long on average sun shines in September in Romanshorn?
The average sunshine duration in September in Romanshorn, Switzerland, is 9.2h.
What is the UV index intensity in September in Romanshorn?
In September, the average daily maximum UV index in Romanshorn, Switzerland, is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
23°C
18.6°C
13.9°C
Average low temperature
12.6°C
8.6°C
5.4°C
Average pressure
1017.8mbar
1018.6mbar
1018.7mbar
Average wind speed
6.7km/h
6.9km/h
7.1km/h
Average max. wind speed
7.4km/h
7.3km/h
7.9km/h
Average wind speed gusts
10.6km/h
11km/h
11.6km/h
Average humidity
76%
78%
80%
Average rainfall
126mm
57mm
79mm
Average rainfall days
18.8
14.3
11.3
Average snowfall
0mm
0mm
45mm
Average snowfall days
0
0.1
1.5
Average daylight
14h 1min
12h 4min
10h 5min
Average sunshine
10h 2min
9h 1min
6h 2min
Average sunshine days
8.4
12.5
17.2
Average UV index
4
4
3
Average cloud cover
30%
34%
35%
Average visibility
9km
8km
9km
Average temperature in September
Romanshorn, Switzerland
  • Average high temperature in September: 18.6°C

The warmest month (with the highest average high temperature) is July (23.1°C).
The month with the lowest average high temperature is January (2.9°C).

  • Average low temperature in September: 8.6°C

The months with the highest average low temperature are July and August (12.6°C).
The coldest month (with the lowest average low temperature) is January (-2.9°C).

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

The month with the highest atmospheric pressure is December (1020.8mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).

Average wind speed in September
Romanshorn, Switzerland
  • Average wind speed in September: 6.9km/h

The windiest month (with the highest average wind speed) is March (9km/h).
The calmest month (with the lowest average wind speed) is August (6.7km/h).

Average humidity in September
Romanshorn, Switzerland
  • Average humidity in September: 78%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (75%).

Average rainfall in September
Romanshorn, Switzerland
  • Average rainfall in September: 57mm

The wettest month (with the highest rainfall) is August (126mm).
The driest month (with the least rainfall) is April (52mm).

Average rainfall days in September
Romanshorn, Switzerland
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is July (20.8 days).
The month with the least rainy days is February (9.5 days).

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

The month with the highest snowfall is January (353mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September
Romanshorn, Switzerland
  • Average snowfall days in September: 0.1 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 and August (0 days).

Average daylight in September /
Average sunshine in September
Romanshorn, 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: 9h and 1min

The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).

Average sunshine days in September
Romanshorn, Switzerland
  • Average sunshine days in September: 12.5 days

The month with the most sunshine days is October (17.2 days).
The month with the least sunshine days is July (6.6 days).

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

Average cloud cover in September
Romanshorn, Switzerland
  • Average cloud cover in September: 34

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).

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

The months with the highest visibility are April, May, June, July, August, October and November (9km).
The months with the lowest visibility are January, February, March, September and December (8km).

°Celsius°Fahrenheit
englishespañol中文
Share