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Ollon Weather in September
Ollon in September sees moderate daytime temperatures of 17°C (63°F) and nighttime lows of 6°C (43°F). Rainfall is fairly high this month at around 147 mm (5.8 in), so pack a rain jacket to stay dry.
Rainfall in Ollon in September
Typically, you can expect about 13 days of rain this month, with 147 mm (5.8 in) on average. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Ollon in September
In September, expect moderate temperatures in Ollon, with highs of 17°C (63°F) and lows of 6°C (43°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights fall to 6°C (43°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 Ollon in September
The month enjoys around 210 hours of sunshine, creating mostly sunny days with good weather conditions.For Ollon itself, August generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Ollon Temperature in September
Min Temperature
6°C (43°F)
Max Temperature
17°C (63°F)
Chance of Rain
44%
Precipitation
147 mm (5.8 in)
Rainy days
13 days
Humidity
71% *
Sunshine
210 hours *
Percentage Sunshine
65% *
* Data from: Sion, Switzerland (27 KM, 17 Miles).
Ollon Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Ollon - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Ollon typically drop from around 22°C (72°F) at the start of September to approximately 18°C (64°F) by the end. Nights are cool, with lows typically ranging from 8°C (46°F) to 12°C (54°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 records for Ollon in September
Browse day-by-day weather records for Ollon spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Ollon historical weather extremes in September
Our historical data for Ollon spans 1976 to 2026, revealing these weather extremes.
- On September 5, 2023, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- Ollon experienced its chilliest September day on September 25, 2002, reaching only 9°C (48°F).
- Ollon registered its coldest September night on September 13, 1997, with temperatures dropping to -2°C (28°F).
- The wettest day in September Ollon was on September 17, 2006 with 39 mm (1.5 in) of precipitation.
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
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Ollon in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Ollon in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling5/10 -
Walking5/10 -
Camping3/10 -
Outdoor sports9/10
Ollon 3-Day Forecast
More climate data for Ollon
Temperature Rainfall Sunshine Humidity
See the full Ollon climate overview or explore weather in Switzerland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Zürich
20°C (68°F) Crans-Montana15°C (59°F) Engelberg
15°C (59°F) Nendaz15°C (59°F) Saas-Fee12°C (54°F) Davos13°C (55°F) Grindelwald13°C (55°F) Zermatt11°C (52°F) Bucket list
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The 5 most scenic train journeys in Switzerland
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