Siena climate
Italy
In Siena, seasonality tends to show up in mornings/evenings and indoor-outdoor gaps more than in a single number.
It helps to scan the year-round pattern for Siena before zooming into one month.
Climate facts
Dec · Jan · Feb
Avg low 1–4°C / high 8–12°C · Rainy days: 6–11 / 45–95 mm
Mar · Apr · May · Sep · Oct · Nov
Avg low 7–15°C / high 14–24°C · Rainy days: 5–10 / 45–110 mm
Mar · Apr · May · Sep · Oct · Nov
Avg low 7–15°C / high 14–24°C · Rainy days: 5–10 / 45–110 mm
Jun · Jul · Aug
Avg low 17–21°C / high 28–33°C (higher feel in sun) · Rainy days: 2–6 / 15–60 mm
How it tends to feel for travel
For travel, what you remember is often variability (rain patterns, humidity, daily swings), not the average.
When it tends to fit
- • Once you see the year-round pattern, it’s easier to judge whether a month fits your style.
- • If you revisit the city, separating “seasonal itineraries” can save a lot of planning time.
When it may not fit
- • If you rely only on averages, you may be surprised by variability (squalls, wind, indoor AC).
- • In monsoon-like periods, the more your itinerary depends on outdoor walking, the higher the risk.
Outfit notes
This connects climate patterns to packing—without over-interpreting.
- • 🏞️ Baseline: Siena is a hill city in inland Tuscany, so evenings can cool down quickly. It’s common to need a different comfort level at noon vs after sunset.
- • ☀️ Summer (Jun–Aug): Strong sun and hot midday. Breathable/quick-dry clothing plus hat/sunscreen/water (electrolytes) helps.
- • 🌬️ Evening breeze: Even if days are T-shirt weather, evenings can feel cooler—bring a thin shirt/cardigan.
Once you lock in a couple of constraints, the decision gets much easier.
Explore Siena
These pages are connected so you can compare conditions and decide for yourself.