SeasonMapSirmione (Lake Garda) weather in September
Italy
September in Sirmione: warm, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Sirmione · #397 of 1383 destinations to visit in September · comfort 87/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Sirmione in September
Sirmione's forum calls September a sweet spot for weather — warm, swimmable and with clearer blue skies than the summer heat haze — but warns the town itself stays genuinely busy, with locals as well as tourists making a weekend trip to the lake if the forecast looks good. Regulars suggest avoiding Sirmione specifically on weekends, even late in the month, if a quieter visit matters more than the crowds.
Add your own note from Sirmione's card on the map.
Sirmione climate normals — September
| Daytime high | 25°C / 76°F | 🌤 warm |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 116 mm / 4.6 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 15°C / 58°F | |
| Sunshine | 9.9 h/day | |
| Daylight | 12.5 h | |
| Wind | 8 km/h / 5 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Sirmione in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusySummer holidays in Italy, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Sirmione's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherSirmione's best weather comes in April, May and September — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Sirmione in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Peler and ora
1 Apr – 30 Sep · usuallyWind seasonGarda runs on two daily winds: the peler down the lake from the north in the early morning, the ora back up it from around midday. Every sailing and windsurf school here plans the day around them.
- Season
Lake warm enough to swim
20 Jun – 15 Sep · usuallySea warm enoughA deep alpine lake warms slowly, so swimming off the rocks below the Grotte di Catullo is a late-June to mid-September proposition. There is no sand anywhere on the peninsula.
Nearby, and something's on
Within 300 km of Sirmione — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Sirmione?
Sirmione in September — FAQ
- Is September a good time to visit Sirmione?
- September in Sirmione: warm, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Sirmione on SeasonMap's comfort score (87/100).
- What is the weather like in Sirmione in September?
- In September, Sirmione averages a daily high of 24.5°C and a low of 16.9°C, with about 116.2 mm of rain over roughly 11.1 rainy days.
- What is the air quality in Sirmione in September?
- Sirmione has a mean US Air Quality Index of about 49 in September.
Other months in Sirmione
Warmer or cooler than Sirmione in September
Similar destinations in Southern Europe — September
Within 300 km: Verona's Arena opera festival around 10 Jun – 10 Sep, and Milan's Lake ferries on full timetable around 1 Apr – 15 Oct.