Grindelwald Weather in September
Thinking of visiting Grindelwald in September? Expect moderate temperatures reaching 13°C (55°F) during the day, dropping to 3°C (37°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Grindelwald in September
You can expect rain on roughly 16 days based on historical data, averaging 165 mm (6.5 in) for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Grindelwald in September
Daytime temperatures in Grindelwald reach 13°C (55°F) in September, dropping to 3°C (37°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights fall to 3°C (37°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Grindelwald in September
The city usually sees around 149 hours of sunlight, indicating a moderately sunny period.If you're planning additional trips, our weather planner can help you find destinations that match your weather preferences.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Grindelwald's climate page.
Grindelwald Temperature in September
Min Temperature
3°C (37°F)
Max Temperature
13°C (55°F)
Chance of Rain
53%
Precipitation
165 mm (6.5 in)
Rainy days
16 days
Humidity
80% *
Sunshine
149 hours *
Percentage Sunshine
52% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Grindelwald typically drop from around 19°C (66°F) at the start of September to approximately 16°C (61°F) by the end. Nights are cold, with lows typically ranging from 5°C (41°F) to 8°C (46°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Grindelwald in September
Browse day-by-day weather records for Grindelwald spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Grindelwald historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Grindelwald.
- The hottest September day on record in Grindelwald reached 31°C (88°F) (September 14, 1987).
- The coldest September day was on September 19, 1981, with a maximum of 1°C (34°F).
- The lowest overnight temperature recorded in September was -12°C (10°F) (September 19, 1977).
- The heaviest September precipitation occurred on September 13, 2008, when 54 mm (2.1 in) of precipitation fell.
Best Places in Switzerland in September
Find out more about the weather in Switzerland and which places have the best travel conditions in this month. See all of Switzerland in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Grindelwald in September
The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. It's going to pour! Pack a good poncho and prepare for very wet conditions. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Grindelwald in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Grindelwald's climate page.
Temperature Rainfall Sunshine Humidity
See the full Grindelwald climate overview or explore weather in Switzerland.
