Siena Climate by Month
Siena, Tuscany, Italy
Hot summers and cool winters, with rain spread through the year.
Siena has hot summers and cool winters, with rain spread through the year. August is the warmest month, with highs around 86°F (30°C); January is the coolest at 49°F (10°C), and nights dip to 37°F (3°C). About 30 in (755 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 86°F(30°C)
- Average high, August
- Coldest nights
- 37°F(3°C)
- Average low, January
- Rain per year
- 30 in(755 mm)
- No clear rainy season
- Humidity
- 66%
- Sunniest: July
Best and worst months in Siena
Best for weatherThe most comfortable weather comes in May, June and September, with highs around 77°F (25°C) and about 2.2 in (57 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 50°F (10°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Siena weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 49°F(10°C) | 37°F(3°C) | 2.1 in(54 mm) | 73% | 1.6 |
| FebFebruary | 52°F(11°C) | 38°F(3°C) | 2.4 in(60 mm) | 69% | 2.4 |
| MarMarch | 58°F(14°C) | 42°F(6°C) | 2.0 in(51 mm) | 66% | 3.4 |
| AprApril | 65°F(18°C) | 47°F(9°C) | 2.3 in(59 mm) | 65% | 4.8 |
| MayMayBest | 73°F(23°C) | 54°F(12°C) | 2.2 in(57 mm) | 66% | 6.2 |
| JunJuneBest | 80°F(27°C) | 60°F(16°C) | 1.9 in(47 mm) | 63% | 6.9 |
| JulJuly | 86°F(30°C) | 64°F(18°C) | 1.1 in(27 mm) | 57% | 7.1 |
| AugAugust | 86°F(30°C) | 65°F(18°C) | 1.1 in(29 mm) | 60% | 6.2 |
| SepSeptemberBest | 77°F(25°C) | 58°F(15°C) | 2.6 in(66 mm) | 65% | 4.4 |
| OctOctober | 68°F(20°C) | 53°F(12°C) | 3.7 in(94 mm) | 72% | 2.9 |
| NovNovember | 58°F(15°C) | 47°F(8°C) | 5.0 in(127 mm) | 67% | 1.6 |
| DecDecember | 50°F(10°C) | 39°F(4°C) | 3.3 in(84 mm) | 70% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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