Italy · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Trieste are May, June and September, when daytime temperatures are agreeable and rainfall is relatively low.
Trieste sees its warmest weather in July, when daytime highs average around 29°C, and its coolest in January (around 9°C).
Annual precipitation totals roughly 951mm — November is typically the wettest month (~118mm) and January the driest (~52mm).
A distinctly wetter period runs from October to November — worth planning around if you prefer dry days.
July is the sunniest month, with about 299 hours of sunshine.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 61 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 9° / 4°C | 52mm | 🤔 Fair |
| February | 10° / 4°C | 65mm | 🤔 Fair |
| March | 14° / 7°C | 57mm | 👍 Good |
| April | 18° / 11°C | 69mm | 👍 Good |
| May | 22° / 15°C | 81mm | 🌟 Great |
| June | 27° / 19°C | 75mm | 🌟 Great |
| July | 29° / 21°C | 56mm | 👍 Good |
| August | 29° / 21°C | 75mm | 👍 Good |
| September | 24° / 17°C | 108mm | 🌟 Great |
| October | 19° / 13°C | 113mm | 👍 Good |
| November | 14° / 9°C | 118mm | 🤔 Fair |
| December | 10° / 5°C | 83mm | 🤔 Fair |
January in Trieste is chilly, with average daytime highs around 9°C (48°F) and nighttime lows near 4°C (39°F). Expect roughly 52mm of precipitation spread over about 6 rainy days, with little rainfall.
🎒 What to pack — jacket or coat · long-sleeve layers
February in Trieste is chilly, with average daytime highs around 10°C (49°F) and nighttime lows near 4°C (40°F). Expect roughly 65mm of precipitation spread over about 6 rainy days, with a moderate amount of rain.
☀️ About 129 hours of sunshine over the month (~4h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
March in Trieste is chilly, with average daytime highs around 14°C (56°F) and nighttime lows near 7°C (45°F). Expect roughly 57mm of precipitation spread over about 6 rainy days, with little rainfall.
☀️ About 169 hours of sunshine over the month (~6h/day).
🎒 What to pack — jacket or coat · long-sleeve layers
April in Trieste is mild, with average daytime highs around 18°C (64°F) and nighttime lows near 11°C (51°F). Expect roughly 69mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
☀️ About 189 hours of sunshine over the month (~6h/day).
🎒 What to pack — light jacket · layers for cool evenings
May in Trieste is pleasantly warm, with average daytime highs around 22°C (72°F) and nighttime lows near 15°C (59°F). Expect roughly 81mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
☀️ About 236 hours of sunshine over the month (~8h/day).
🎒 What to pack — light layers · comfortable walking shoes
June in Trieste is warm, with average daytime highs around 27°C (80°F) and nighttime lows near 19°C (66°F). Expect roughly 75mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
☀️ About 261 hours of sunshine over the month (~9h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses
July in Trieste is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 21°C (70°F). Expect roughly 56mm of precipitation spread over about 6 rainy days, with little rainfall.
☀️ About 299 hours of sunshine over the month (~10h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses
August in Trieste is warm, with average daytime highs around 29°C (84°F) and nighttime lows near 21°C (70°F). Expect roughly 75mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
☀️ About 281 hours of sunshine over the month (~9h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses
September in Trieste is pleasantly warm, with average daytime highs around 24°C (76°F) and nighttime lows near 17°C (63°F). Expect roughly 108mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
☀️ About 202 hours of sunshine over the month (~7h/day).
🎒 What to pack — light layers · comfortable walking shoes
October in Trieste is pleasantly warm, with average daytime highs around 19°C (66°F) and nighttime lows near 13°C (56°F). Expect roughly 113mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 149 hours of sunshine over the month (~5h/day).
🎒 What to pack — light layers · comfortable walking shoes · compact umbrella or rain jacket
November in Trieste is mild, with average daytime highs around 14°C (58°F) and nighttime lows near 9°C (49°F). Expect roughly 118mm of precipitation spread over about 10 rainy days, and this is one of the wetter months.
☀️ About 96 hours of sunshine over the month (~3h/day).
🎒 What to pack — light jacket · layers for cool evenings · compact umbrella or rain jacket
December in Trieste is chilly, with average daytime highs around 10°C (50°F) and nighttime lows near 5°C (42°F). Expect roughly 83mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
🎒 What to pack — jacket or coat · long-sleeve layers