Locarno Weather in September
Locarno in September sees pleasant temperatures, with highs around 19°C (66°F) and overnight lows of 10°C (50°F). With the rainy season in full effect, expect around 191 mm (7.5 in) of rainfall and regular showers throughout the month.
Rainfall in Locarno in September
Locarno is in the rainy season in September, with rain on around 13 days and an average of 191 mm (7.5 in). The rainy season here brings regular, substantial showers. It's worth being prepared for rain on most days you're out.
Temperature in Locarno in September
In September, expect pleasant temperatures in Locarno, with highs of 19°C (66°F) and lows of 10°C (50°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 10°C (50°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Locarno in September
There are approximately 198 hours of sunshine this month, despite being the rainy season. Rain often arrives in the late afternoon or evening, keeping mornings and early afternoons sunny. Even during the wet season, it could still be a nice time to visit.If you prefer dry days with pleasant temperatures, June, July and August typically offer 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.
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 Locarno's climate page.
Locarno Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
19°C (66°F)
Chance of Rain
44%
Precipitation
191 mm (7.5 in)
Rainy days
13 days
Humidity
70%
Sunshine
198 hours
Percentage Sunshine
57%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Locarno typically drop from around 24°C (75°F) at the start of September to approximately 20°C (68°F) by the end. Nights are cool, with lows typically ranging from 11°C (52°F) to 14°C (57°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 Locarno in September
Browse day-by-day weather records for Locarno spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Locarno historical weather extremes in September
Our historical data for Locarno spans 1976 to 2025, revealing these weather extremes.
- On September 25, 1983, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 9°C (48°F), recorded on September 27, 2007.
- Locarno registered its coldest September night on September 18, 1977, with temperatures dropping to -4°C (25°F).
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 Locarno 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. It's going to pour! Pack a good poncho and prepare for very wet conditions. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Locarno 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 Locarno's climate page.
Temperature Rainfall Sunshine Humidity
See the full Locarno climate overview or explore weather in Switzerland.
