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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's comfortable 16.9°C (62.4°F) to a cool 12.9°C (55.2°F). During the nights in September, Grimmialp experiences a consistent average temperature of 3.6°C (38.5°F).Humidity
In Grimmialp, the average relative humidity in September is 82%.Rainfall
September is the month with the least rainfall. Rain falls for 17.6 days and accumulates 74mm (2.91") of precipitation.Snowfall
Months with snowfall in Grimmialp, Switzerland, are January through December. In September, it is snowing for 2.6 days. Throughout September, 54mm (2.13") of snow is accumulated. In Grimmialp, during the entire year, snow falls for 127.3 days and aggregates up to 5589mm (220.04") of snow.Daylight
In September, the average length of the day is 12h and 33min.On the first day of September, sunrise is at 06:50 and sunset at 20:09. On the last day of the month, sunrise is at 07:28 and sunset at 19:11 CEST.
Sunshine
In Grimmialp, the average sunshine in September is 7.9h.UV index
In Grimmialp, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 3 in September interprets into the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Grimmialp?
What is the average humidity in September in Grimmialp?
What is the driest month in Grimmialp?
How much does it rain in Grimmialp in September?
How much does it snow in Grimmialp in September?
How many hours of daylight does Grimmialp have in September?
What time are sunrise and sunset in September in Grimmialp?
How many hours of sunshine does Grimmialp have in September?
How high is the UV index in September in Grimmialp?
Average temperature in September
Grimmialp, Switzerland
- Average high temperature in September: 12.9°C
The warmest month (with the highest average high temperature) is August (16.9°C).
The month with the lowest average high temperature is January (-2.1°C).
- Average low temperature in September: 3.6°C
The month with the highest average low temperature is July (6.8°C).
The coldest month (with the lowest average low temperature) is February (-11.3°C).
Average pressure in September
Grimmialp, Switzerland
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Grimmialp, Switzerland
- Average wind speed in September: 6.8km/h
The windiest month (with the highest average wind speed) is December (9km/h).
The calmest month (with the lowest average wind speed) is August (6.6km/h).
Average humidity in September
Grimmialp, Switzerland
- Average humidity in September: 82%
The month with the highest relative humidity is March (92%).
The months with the lowest relative humidity are July and August (80%).
Average rainfall in September
Grimmialp, Switzerland
- Average rainfall in September: 74mm
The wettest month (with the highest rainfall) is May (193mm).
The driest month (with the least rainfall) is September (74mm).
Average rainfall days in September
Grimmialp, Switzerland
- Average rainfall days in September: 17.6 days
The month with the highest number of rainy days is July (24.3 days).
The month with the least rainy days is December (4.1 days).
Average snowfall in September
Grimmialp, Switzerland
- Average snowfall in September: 54mm
The month with the highest snowfall is December (1065mm).
The month with the least snowfall is July (7mm).
Average snowfall days in September
Grimmialp, Switzerland
- Average snowfall days in September: 2.6 days
The month with the highest number of snowfall days is March (20.3 days).
The month with the least snowfall days is August (0.4 days).
Average daylight in September /
Average sunshine in September
Grimmialp, Switzerland
- Average daylight in September: 12h and 3min
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: 7h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in September
Grimmialp, Switzerland
- Average sunshine days in September: 8.1 days
The month with the most sunshine days is October (14.8 days).
The months with the least sunshine days are May and June (3.2 days).
Average UV index in September
Grimmialp, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Grimmialp, Switzerland
- Average cloud cover in September: 43
The months with the most cloud cover are February and March (Cloud cover 56).
The month with the least cloud cover is October (Cloud cover 40).
Average visibility in September
Grimmialp, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are June, July, August and October (8km).
The months with the lowest visibility are January, February and March (6km).
