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
The advent of September brings a slight shift in average high-temperature, moving from a moderate 15.8°C (60.4°F) in August to a cool 11.5°C (52.7°F). During the month of September, the temperature falls to an average of 2.5°C (36.5°F).Humidity
In September, the average relative humidity in Grindelwald is 85%.Rainfall
The month with the least rainfall is September, when the rain falls for 16.4 days and typically collects 50mm (1.97") of precipitation.Snowfall
Months with snowfall in Grindelwald are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 3mm (0.12") of snow. In Grindelwald, during the entire year, snow falls for 97.4 days and aggregates up to 2150mm (84.65") of snow.Daylight
In Grindelwald, the average length of the day in September is 12h and 33min.On the first day of September, sunrise is at 06:48 and sunset at 20:06. On the last day of the month, sunrise is at 07:25 and sunset at 19:09 CEST.
Sunshine
In Grindelwald, the average sunshine in September is 7.5h.UV index
In Grindelwald, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 2 during September leads to these advisories:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Grindelwald in September?
What is the average humidity in September in Grindelwald?
What is the driest month in Grindelwald?
How many days does it rain in September in Grindelwald?
When does it start snowing in Grindelwald?
What is the average length of the day in September in Grindelwald?
When is the sunrise / sunset in September in Grindelwald?
How many hours of sunshine does Grindelwald have in September?
What is the UV index intensity in September in Grindelwald?
Average temperature in September
Grindelwald, Switzerland
- Average high temperature in September: 11.5°C
The warmest month (with the highest average high temperature) is August (15.8°C).
The months with the lowest average high temperature are January and February (-2.8°C).
- Average low temperature in September: 2.5°C
The month with the highest average low temperature is July (5.7°C).
The coldest month (with the lowest average low temperature) is January (-12.3°C).
Average pressure in September
Grindelwald, 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 (1015.3mbar).
Average wind speed in September
Grindelwald, Switzerland
- Average wind speed in September: 6.3km/h
The windiest month (with the highest average wind speed) is December (8.7km/h).
The calmest month (with the lowest average wind speed) is August (5.8km/h).
Average humidity in September
Grindelwald, Switzerland
- Average humidity in September: 85%
The month with the highest relative humidity is March (92%).
The months with the lowest relative humidity are July and August (83%).
Average rainfall in September
Grindelwald, Switzerland
- Average rainfall in September: 50mm
The wettest month (with the highest rainfall) is May (117mm).
The driest month (with the least rainfall) is September (50mm).
Average rainfall days in September
Grindelwald, Switzerland
- Average rainfall days in September: 16.4 days
The month with the highest number of rainy days is July (23.3 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Grindelwald, Switzerland
- Average snowfall in September: 3mm
The month with the highest snowfall is December (423mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Grindelwald, Switzerland
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Grindelwald, 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 3min
The month with the most sunshine is July (Average sunshine: 8h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in September
Grindelwald, Switzerland
- Average sunshine days in September: 10.7 days
The month with the most sunshine days is October (15 days).
The month with the least sunshine days is June (5.4 days).
Average UV index in September
Grindelwald, Switzerland
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January, March, April, November and December (UV index 1).
Average cloud cover in September
Grindelwald, Switzerland
- Average cloud cover in September: 51
The months with the most cloud cover are February and May (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 47).
Average visibility in September
Grindelwald, Switzerland
- Average visibility in September: 6km
The months with the highest visibility are June, July, August, October, November and December (7km).
The month with the lowest visibility is February (5km).
