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Best time to visit · Italy
On the climate data, the best time to visit Siena is April – June and September & October, scoring up to 90/100 with highs around 83°F (28°C) and 1.5 in (37 mm) of rain in June. July & August are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
Highs run from 46°F to 89°F across the year, and the yearly total is about 28.6 in (727 mm) of rain.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 46°F8°C | 49°F9°C | 56°F13°C | 64°F18°C | 72°F22°C | 83°F28°C | 89°F32°C | 88°F31°C | 78°F25°C | 68°F20°C | 56°F14°C | 48°F9°C |
| Avg low | 32°F0°C | 33°F1°C | 37°F3°C | 43°F6°C | 51°F10°C | 59°F15°C | 64°F18°C | 64°F18°C | 56°F13°C | 49°F9°C | 41°F5°C | 34°F1°C |
| Rain | 2.3 in58 mm | 2.5 in64 mm | 2.4 in62 mm | 2.1 in54 mm | 2.3 in58 mm | 1.5 in37 mm | 1.2 in30 mm | 1.4 in36 mm | 2.6 in66 mm | 3.2 in82 mm | 4.0 in102 mm | 3.1 in78 mm |
| Humidity | 89% | 85% | 81% | 77% | 71% | 61% | 54% | 57% | 66% | 78% | 87% | 89% |
| Cloud | 70% | 67% | 65% | 62% | 62% | 46% | 31% | 34% | 50% | 60% | 69% | 67% |
| Comfort | 54 | 58 | 71 | 86 | 87 | 90 | 80 | 81 | 90 | 85 | 66 | 56 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 324 m (1,063 ft), close to Siena's own ~339 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The cold peaks here: highs of 46–49°F (8–9°C), and nights reach 32°F (0°C). About 7.9 in (200 mm) of rain falls across these months, 28% of the year's total. Comfort scores bottom out in December – February; the season averages 56/100.
Temperatures climb through the season, from 56°F highs in March to 72°F by May. About 6.9 in (174 mm) of rain falls across these months, 24% of the year's total. Lows bottom out around 37°F (3°C). April & May are among the best-scoring months (season average 81/100).
The warmest stretch of the year, with highs of 83–89°F (28–32°C). It's the driest season, with only about 4.1 in (103 mm) of rain, 14% of the year's total. Lows bottom out around 59°F (15°C). Comfort peaks here: June ranks with the year's best, and the season averages 84/100.
Temperatures slide from 78°F highs in September to 56°F by November. It's the wettest season, with about 9.8 in (250 mm) of rain, 34% of the year's total. Lows bottom out around 41°F (5°C). September & October are among the best-scoring months (season average 80/100).
By comfort score: 7 Great, 2 Good and 3 Fair. Great months: April – October. Tap a month for its own guide.
On the climate data, the best time to visit Siena is April – June and September & October, scoring up to 90/100 with highs around 83°F (28°C) and 1.5 in (37 mm) of rain in June. July & August are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
November is the wettest month, averaging about 4.0 in (102 mm) of rain. July is the driest, with about 1.2 in (30 mm). The yearly total is around 28.6 in (727 mm).
January is the coldest, with average lows of 32°F (0°C) and highs of 46°F (8°C). The warmest is July, with average highs of 89°F (32°C).
Not very: summer (June – August) humidity averages 57%, and highs peak around 89°F (32°C), so heat matters more than mugginess.
Not on average: even in January, the coldest month, lows average 32°F (0°C). Individual cold snaps can still dip lower.
Poll the group on April – June and September & October dates, then plan the days, packing and costs together.
