Grächen Weather in September
Grächen in September sees moderate daytime temperatures of 13°C (55°F) and nighttime lows of 2°C (36°F). Rainfall is fairly high this month at around 142 mm (5.6 in), so pack a rain jacket to stay dry.
Rainfall in Grächen in September
You can expect rain on around 15 days based on historical patterns, with 142 mm (5.6 in) average for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Grächen in September
In September, expect moderate temperatures in Grächen, with highs of 13°C (55°F) and lows of 2°C (36°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to 2°C (36°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Grächen in September
The area experiences a moderate amount of sunshine, with approximately 166 hours of sunlight expected. This means a decent mix of sun and overcast.September in Grächen has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
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 Grächen's climate page.
Grächen Temperature in September
Min Temperature
2°C (36°F)
Max Temperature
13°C (55°F)
Chance of Rain
50%
Precipitation
142 mm (5.6 in)
Rainy days
15 days
Humidity
70% *
Sunshine
166 hours *
Percentage Sunshine
69% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Grächen 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 6°C (43°F) to 9°C (48°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 Grächen in September
Browse day-by-day weather records for Grächen spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Grächen historical weather extremes in September
The extremes listed below come from historical weather data collected in Grächen from 1982 through 2025.
- On September 9, 1997, temperatures climbed to 30°C (86°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 4°C (39°F), recorded on September 26, 2020.
- Grächen registered its coldest September night on September 29, 1995, with temperatures dropping to -12°C (10°F).
- Peak precipitation in September occurred on September 13, 1997, when 30 mm (1.2 in) of precipitation was measured.
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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What to Wear in Grächen in September
Pack for changing conditions in Grächen in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Grächen 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 Grächen's climate page.
Temperature Rainfall Sunshine Humidity
See the full Grächen climate overview or explore weather in Switzerland.
