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Trieste weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Trieste?
For a warm holiday, the best week has been 15–21 June (Weather Index 96). Favourable start dates for a 7-day trip run from 10 June to 19 June. July and August are warmest (29°C), August is driest and June and July have the most sun.
- Warmest
- July and August 29°C
- Coolest
- January 9°C
- Driest
- August 30% rain-day chance
- Wettest
- May 54% rain-day chance
- Sunniest
- June and July 13 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Trieste
Trieste historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 8.7 | 4.2 | 31.9 | 9.9 | 107.7 | 5.9 |
| February | 10.7 | 5.3 | 33.2 | 9.3 | 108.8 | 6.7 |
| March | 13.6 | 7.1 | 33.9 | 10.5 | 105.6 | 9.1 |
| April | 17.3 | 10.4 | 34.7 | 10.4 | 105.8 | 10.8 |
| May | 20.9 | 14.7 | 54.2 | 16.8 | 156.4 | 11.3 |
| June | 26.8 | 19.9 | 34.3 | 10.3 | 99.9 | 13.1 |
| July | 28.7 | 21.5 | 37.4 | 11.6 | 93.2 | 13.3 |
| August | 29.0 | 21.5 | 29.7 | 9.2 | 106.6 | 12.4 |
| September | 24.1 | 17.6 | 40.3 | 12.1 | 197.5 | 10.0 |
| October | 19.3 | 13.5 | 37.4 | 11.6 | 160.0 | 8.0 |
| November | 13.6 | 9.2 | 42.7 | 12.8 | 185.9 | 6.1 |
| December | 10.1 | 5.7 | 30.6 | 9.5 | 122.2 | 5.4 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.