Our verdict
The best time to visit Siena is April-June
In summer, the average maximum temperature is around 30℃ (87℉), but temperatures can sometimes reach as high as 33℃ (92℉) on the hottest days of the year. In the winter months, it can get down to as low as -1℃ (30℉) at night.
If you’re keen to work on your tan in Siena, you’re most likely get the longest days between sun-up and sun-down around July. You don’t want to get wet on your holiday, do you? Well if you’re trying to avoid the rain, then steer clear of Siena in November. Head over there in August instead if you want to increase your chances of not being rained on.
If you want to learn everything you need to know about the best times to travel to Siena, the weather and stats by month and so much more, make sure you keep reading. Once you’re ready, we’ve included a bunch of our favourite online booking tools to help you find the best deals on flights, accommodation and anything else you’ll need for your trip. You’ll also need to check if you need a visa too – check out Natvisa’s Italy Visa page for more info.
Happy reading!
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Siena seasons
Before you continue, it’s important to know when the seasons are in Siena as they might be different to yours depending on where in the world you’re travelling from. Siena is in the Northern Hemisphere, so the seasons fall during these months:
| Season | Months |
|---|---|
| Summer | June to August |
| Autumn/fall | September to November |
| Winter | December to February |
| Spring | March to May |
Average temperatures in Siena
If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Siena for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.
Siena climate by month
If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Siena for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.
Jump to:
Siena in January
- Average temperature: 5℃ (41℉)
- Average high temperature: 8℃ (47℉)
- Average low temperature: 2℃ (35℉)
- Average humidity: 82%
- Average sunny days: 17 days
- Average rainfall: 31mm (1") over 12 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in January, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Siena in February
- Average temperature: 6℃ (42℉)
- Average high temperature: 10℃ (50℉)
- Average low temperature: 2℃ (36℉)
- Average humidity: 81%
- Average sunny days: 15 days
- Average rainfall: 28mm (1") over 11 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in February, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Siena in March
- Average temperature: 9℃ (47℉)
- Average high temperature: 13℃ (56℉)
- Average low temperature: 4℃ (39℉)
- Average humidity: 78%
- Average sunny days: 17 days
- Average rainfall: 27mm (1") over 12 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in March, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Siena in April
- Average temperature: 12℃ (54℉)
- Average high temperature: 18℃ (64℉)
- Average low temperature: 7℃ (44℉)
- Average humidity: 76%
- Average sunny days: 16 days
- Average rainfall: 29mm (1") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in April, make sure you pack a warm jacket or coat.
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Siena in May
- Average temperature: 15℃ (59℉)
- Average high temperature: 20℃ (69℉)
- Average low temperature: 9℃ (48℉)
- Average humidity: 78%
- Average sunny days: 16 days
- Average rainfall: 39mm (2") over 14 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in May, make sure you pack a coat or jumper for the evenings and some light clothes for the daytime.
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Siena in June
- Average temperature: 20℃ (67℉)
- Average high temperature: 26℃ (78℉)
- Average low temperature: 13℃ (55℉)
- Average humidity: 73%
- Average sunny days: 20 days
- Average rainfall: 21mm (1") over 8 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in June, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
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Siena in July
- Average temperature: 23℃ (73℉)
- Average high temperature: 29℃ (85℉)
- Average low temperature: 15℃ (60℉)
- Average humidity: 66%
- Average sunny days: 23 days
- Average rainfall: 18mm (1") over 6 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in July, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
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Siena in August
- Average temperature: 23℃ (74℉)
- Average high temperature: 30℃ (87℉)
- Average low temperature: 16℃ (61℉)
- Average humidity: 63%
- Average sunny days: 24 days
- Average rainfall: 12mm (0") over 6 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in August, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
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Siena in September
- Average temperature: 19℃ (65℉)
- Average high temperature: 25℃ (76℉)
- Average low temperature: 13℃ (56℉)
- Average humidity: 72%
- Average sunny days: 19 days
- Average rainfall: 35mm (1") over 9 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in September, make sure you pack t-shirts for the daytime and maybe a light jumper for the evenings as it cools down a bit.
Siena in October
- Average temperature: 14℃ (58℉)
- Average high temperature: 20℃ (67℉)
- Average low temperature: 10℃ (50℉)
- Average humidity: 78%
- Average sunny days: 19 days
- Average rainfall: 32mm (1") over 10 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in October, make sure you pack a warm jacket or coat.
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Siena in November
- Average temperature: 10℃ (49℉)
- Average high temperature: 14℃ (57℉)
- Average low temperature: 6℃ (43℉)
- Average humidity: 85%
- Average sunny days: 15 days
- Average rainfall: 50mm (2") over 12 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in November, make sure you pack a warm jacket or coat.
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Siena in December
- Average temperature: 6℃ (43℉)
- Average high temperature: 10℃ (49℉)
- Average low temperature: 3℃ (37℉)
- Average humidity: 82%
- Average sunny days: 17 days
- Average rainfall: 34mm (1") over 11 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Siena in December, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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