Late summer · Weather & things to do
Siena in August
Little changes in Siena from July: highs stay near 88°F (31°C), lows near 64°F (18°C), and about 1.4 in (36 mm) of rain falls.
It scores 81/100 for comfort, 6th of 12, which makes it a solid shoulder-season month.
- Avg high
- 88°F (31°C)
- Avg low
- 64°F (18°C)
- Rain
- 1.4 in (36 mm)
- Humidity
- 57%
- Cloud cover
- 34%
- Daylight
- ~13 h 47 min
- Comfort score
- 81/100 · Great
What August feels like
Expect proper heat: afternoons average 88°F (31°C), so plan walking and hiking for the morning and save midday for shade, lunch or a swim.
There's a big swing between day and night, about 14°C (25°F), so mornings and evenings feel much cooler than the afternoon.
About 1.4 in (36 mm) of rain falls in a typical year's August.
Clear skies are common, with cloud cover averaging only 34%.
Plan around August
August is shoulder season: good weather, a step below the best months (April – June and September & October).
- Last dry month before the rain picks up: September brings 2.6 in (66 mm).
- Comfort holds steady from July (80 → 81/100).
- Our Tuscany Hill Towns route recommends Apr – Jun, Sep – Oct, so August falls outside its suggested window.
What to pack for August
- Light, breathable clotheshighs average 88°F
- Sunscreen, sunglasses and a hatstrong sun this month
- Refillable water bottleeasy to dehydrate in the heat
- A warm layer for eveningslows near 64°F
- Comfortable walking shoesmost picks involve some walking
What to do in Siena in August
Start early and take shelter at midday: the picks below pair morning outings with places to cool off.
Museo Civico
Palazzo Pubblico's frescoed halls, including Lorenzetti's Good and Bad Government.
Torre del Mangia
Tall tower above Palazzo Pubblico with views of Siena's rooftops.
Museo dell'Opera del Duomo
Cathedral museum holding Duccio's Maestà altarpiece; climb to the Facciatone for a view over the Campo.
Why now A break from 88°F afternoons.
Antica Drogheria Manganelli
Grocery since 1879 selling panforte, local wine and oils.
Why now Somewhere to sit out the hottest hours.
Antica Osteria Da Divo
Restaurant with tables in Etruscan caves beneath the city.
Nearby in August
- Chianti in August~18 mi · highs 90°F, 1.4 in rain · similar daytime temperatures, about as wet
- Val d'Orcia in August~24 mi · highs 87°F, 1.5 in rain · similar daytime temperatures, about as wet
- Florence in August~31 mi · highs 90°F, 1.6 in rain · similar daytime temperatures, about as wet
- Piran in August~188 mi · highs 84°F, 3.1 in rain · 3°C (5°F) cooler by day, wetter
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Siena in August: quick answers
Is August a good time to visit Siena?
It's a good shoulder-season choice, scoring 81/100 against a best of 90 in April – June and September & October. Expect highs of 88°F (31°C) and 1.4 in (36 mm) of rain. Our Tuscany Hill Towns route recommends Apr – Jun, Sep – Oct, so August is outside its suggested window.
How hot is Siena in August?
Average highs are 88°F (31°C) and average lows 64°F (18°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Siena in August?
Not much: about 1.4 in (36 mm) of rain falls across August on average, the 2nd-driest month of the year. The annual total is about 28.6 in (727 mm).
What should I pack for Siena in August?
Bring light, breathable clothes (highs average 88°F), sunscreen, sunglasses and a hat (strong sun this month), refillable water bottle (easy to dehydrate in the heat), a warm layer for evenings (lows near 64°F) and comfortable walking shoes (most picks involve some walking).
Planning Siena in August?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.