Trieste · AutumnMonth summary
Trieste weather in September
✅ Good
🌡️ Temperature min / max
17°C – 24°C
🌧 Rainy days
37% of days
☀️ Sunshine
11.7h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.7/10
📅 📅 Best month
June (8.8/10)
Quick decision
Should you visit Trieste in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 24°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Trieste in September: 24°C and 11.7h of sunshine. Decent, but not the peak.
By trip type
Trieste in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
🎯 Good period — 24°C with good sunshine. Reasonable crowds Autumn in Trieste is often underrated: 24°C, golden light and declining crowds. An interesting window. Expect rain on 37% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if June (8.8/10) remains theoretically better.
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All months for Trieste
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌫️ January | 2°C | 9°C | 34% | 3.4 | 7.2h | 4.3/10 |
| 🌦️ February | 4°C | 11°C | 36% | 3.9 | 8.6h | 4.8/10 |
| ⛅ March | 6°C | 14°C | 32% | 3.4 | 10.7h | 6.8/10 |
| ⛅ April | 9°C | 17°C | 32% | 3.2 | 12.0h | 7.1/10 |
| 🌦️ May | 13°C | 21°C | 50% | 5.2 | 12.7h | 7.3/10 |
| 🌤️ June | 18°C | 27°C | 30% | 3.0 | 14.0h | 8.8/10 |
| 🌤️ July | 20°C | 29°C | 29% | 3.4 | 14.0h | 8.6/10 |
| 🌤️ August | 21°C | 29°C | 25% | 3.0 | 13.0h | 8.6/10 |
| 🌤️ September | 17°C | 24°C | 37% | 6.3 | 11.7h | 7.7/10 |
| 🌤️ October | 13°C | 19°C | 37% | 5.7 | 9.7h | 7.1/10 |
| 🌦️ November | 8°C | 14°C | 45% | 6.3 | 7.2h | 4.5/10 |
| 🌦️ December | 4°C | 10°C | 37% | 4.0 | 6.5h | 4.2/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Trieste averages 24°C, 37% rainy days and 11.7h of sunshine per day. Overall weather score: 7.7/10.
See methodology →
Comparison
September vs June (best month)
The best month is June (score 8.8/10). Difference:
- 🌡️ Max temperature : +3°C
- 🌧 Rainy days : -7%
- ☀️ Sunshine : +2.3h/day
FAQ
FAQ — Trieste in September
Is September a good time to visit Trieste?
September is an excellent time to visit Trieste (score 7.7/10). With 24°C, 11.7h of sunshine and 37% rain, conditions are very favourable.
What to do in Trieste in September?
With 24°C max and 11.7h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Trieste
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