AI-generatedSiena at a glance
- Best time
- May – Sep
- Warmest month
- Jul · 29°
- Sunshine a year
- 2,390 h
- Rain a year
- 875 mm
- Climate
- Temperate
- Time zone
- UTC+1 / UTC+2
- Elevation
- 322 m
Climate in Siena
Siena has a temperate climate with warm summers and cool winters. July is the warmest month with average highs of 29 °C, while January is the coolest at 9 °C. With around 2,390 hours of sunshine a year, Siena is sunny; July is the sunniest month with 10.1 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Good
Best time to visit: May – September
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 11°
- Midday, 13:00: about 18°
- Afternoon, 16:00: about 19°
- Evening, 20:00: about 15°
- Night, 23:00: about 13°
07:2718:34
Cool evenings: pack a jumper or a jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:09–08:06 · evening 17:55–18:51
- Blue hour
- Morning 06:58–07:09 · evening 18:51–19:02
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Siena in October?
In October, Siena is mild: daytime highs average 19 °C, and nights cool down to about 10 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 101 mm in total. All in all, October is a good month for a holiday in Siena.
More details for October
- Daylight
- 11 h 7 min07:27 – 18:34
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 59 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Rome
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %35 %
- Few rainy daysweight 30 %60 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Sunshine hours in Siena
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.1 of 11.1 hours of daylight in Siena, 46 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Siena
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 3 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 9).
Minutes until sunburn in October
- Very fair skin
- about 40 min
- Fair skin
- about 50 min
- Light brown skin
- about 70 min
- Olive skin
- about 85 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Siena: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Siena has about 10 rainy days with 101 mm of rain in total.
Wind and clouds in Siena
How breezy and how cloudy Siena is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Siena typically peaks at 13 km/h during the day: Beaufort 3, light breeze.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 59 % of the sky over Siena: variable cloud, with about 5.1 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Siena
How often the day gets hot in Siena (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Siena has about 0 hot days, with an average daytime high of 19 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Siena
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
CoolOctober: nights around 10°. A duvet at night and a jumper for the evening.
The coolest nights are in January (1°), the warmest in August (18°). Nights are pleasant for sleeping (15 to 20 °C) from June to August. Nights fall below 8 °C on average from November to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 27 | 9° | 1° | 4.1 h | 9 | 61 |
| FebruaryFeb | 38 | 10° | 1° | 5.3 h | 9 | 70 |
| MarchMar | 54 | 13° | 3° | 5.8 h | 10 | 70 |
| AprilApr | 70 | 17° | 6° | 6.4 h | 11 | 76 |
| MayMay | 82 | 21° | 11° | 7.9 h | 11 | 74 |
| JuneJun | 93 | 26° | 15° | 9.0 h | 7 | 47 |
| JulyJul | 83 | 29° | 18° | 10.1 h | 5 | 31 |
| AugustAug | 80 | 29° | 18° | 9.4 h | 7 | 44 |
| SeptemberSep | 83 | 24° | 14° | 7.2 h | 9 | 96 |
| OctoberOct | 75 | 19° | 10° | 5.1 h | 10 | 101 |
| NovemberNov | 43 | 13° | 6° | 4.1 h | 12 | 121 |
| DecemberDec | 26 | 9° | 2° | 4.0 h | 11 | 84 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
43.32° N, 11.33° E · 322 m · Europe/Rome
Best time to visit Siena
The best time to visit Siena is from May to September. For sightseeing, day trips and hiking, conditions are most comfortable from April to June and from September to October. The wettest month is November with 121 mm of precipitation.
Siena through the seasons
How the weather changes over the seasons, with averages for each.
Siena in spring
Mar – May
Good
- 13–21 °C by day
- 7 h of sun a day
- 31 rainy days in all
Siena in summer
Jun – Aug
Excellent
- 26–29 °C by day
- 10 h of sun a day
- 19 rainy days in all
Siena in autumn
Sep – Nov
Good
- 13–24 °C by day
- 6 h of sun a day
- 31 rainy days in all
Siena in winter
Dec – Feb
Poor
- 9–10 °C by day
- 5 h of sun a day
- 28 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Siena for you.
Your best months: May – June, September
Based on the climate averages; tap a month to see its details.
Compare two months in Siena
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
June has the better holiday weather in Siena: score 93 against 75. In June, days are 7 °C warmer than in October. June has 3 fewer rainy days. The sun shines 4 hours longer a day in June.
| Month | October | June |
|---|---|---|
| Weather score | 75 | 93better |
| Day high | 19° | 26° |
| Night low | 10° | 15° |
| Sunshine | 5.1 h | 9.0 hbetter |
| Rainy days | 10 | 7better |
| Rainfall | 101 mm | 47 mmbetter |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – Jun, Sep – Oct
15–28 °C and not too much rain
Rainy months
Nov
12 or more rainy days
Siena month by month
The typical weather for every month at a glance.
27January9° · 4 h
In January, Siena is cold: daytime highs average 9 °C, and nights cool down to about 1 °C. Expect around 4 hours of sunshine a day. Rain falls on about 9 days, adding up to 61 mm. All in all, January is not an ideal month for a holiday in Siena.
Siena in January38February10° · 5 h
In February, Siena is cool: daytime highs average 10 °C, and nights cool down to about 1 °C. Expect around 5 hours of sunshine a day. Rain falls on about 9 days, adding up to 70 mm. All in all, February is not an ideal month for a holiday in Siena.
Siena in February54March13° · 6 h
In March, Siena is cool: daytime highs average 13 °C, and nights cool down to about 3 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 70 mm in total. All in all, March is a so-so month for a holiday in Siena.
Siena in March70April17° · 6 h
In April, Siena is mild: daytime highs average 17 °C, and nights cool down to about 6 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 76 mm in total. All in all, April is a good month for a holiday in Siena.
Siena in April82May21° · 8 h
In May, Siena is warm: daytime highs average 21 °C, and nights cool down to about 11 °C. The sun shines for around 8 hours a day. Rain is frequent, with about 11 rainy days and 74 mm in total. All in all, May is an excellent month for a holiday in Siena.
Siena in May93June26° · 9 h
In June, Siena is warm: daytime highs average 26 °C, and nights cool down to about 15 °C. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 7 days, adding up to 47 mm. On about 6 days the thermometer climbs to 30 °C or more. All in all, June is an excellent month for a holiday in Siena.
Siena in June83July29° · 10 h
In July, Siena is hot: daytime highs average 29 °C, and nights cool down to about 18 °C. With around 10 hours of sunshine a day, there is plenty of sun. Rain falls on about 5 days, adding up to 31 mm. On about 14 days the thermometer climbs to 30 °C or more. All in all, July is an excellent month for a holiday in Siena.
Siena in July80August29° · 9 h
In August, Siena is hot: daytime highs average 29 °C, and nights cool down to about 18 °C. With around 9 hours of sunshine a day, there is plenty of sun. Rain falls on about 7 days, adding up to 44 mm. On about 14 days the thermometer climbs to 30 °C or more. All in all, August is an excellent month for a holiday in Siena.
Siena in August83September24° · 7 h
In September, Siena is warm: daytime highs average 24 °C, and nights cool down to about 14 °C. The sun shines for around 7 hours a day. Rain is frequent, with about 9 rainy days and 96 mm in total. All in all, September is an excellent month for a holiday in Siena.
Siena in September75October19° · 5 h
In October, Siena is mild: daytime highs average 19 °C, and nights cool down to about 10 °C. Expect around 5 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 101 mm in total. All in all, October is a good month for a holiday in Siena.
Siena in October43November13° · 4 h
In November, Siena is cool: daytime highs average 13 °C, and nights cool down to about 6 °C. Expect around 4 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 121 mm in total. All in all, November is a so-so month for a holiday in Siena.
Siena in November26December9° · 4 h
In December, Siena is cold: daytime highs average 9 °C, and nights cool down to about 2 °C. Expect around 4 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 84 mm in total. All in all, December is not an ideal month for a holiday in Siena.
Siena in DecemberSiena compared
Put Siena side by side with another destination.
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Siena vs. San Gimignano
In October the holiday weather in Siena and San Gimignano is about equally good (score 75 vs. 74). During the day it is about as warm in San Gimignano as in Siena.
| in October | Siena | San Gimignano |
|---|---|---|
| Holiday score | 75 | 74 |
| Daytime high | 19° | 19° |
| Sunshine | 5 h | 5 h |
| Rainy days | 10 | 10 |
| Best time | May – Sep | May – Sep |
Through the year
Italy in October: the best places
In October, Siena ranks 10 among the 31 nearest destinations in this country.
- Ravenna20°78
- 2Modena19°78
- 3Ferrara20°78
- 4Mantua19°78
- 5Padua19°78
- 6Bologna20°77
- 7Rome21°77
- 8Assisi19°76
- 10SienaThis page19°75
Planning a trip to Siena
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Siena in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Siena has its best school-holiday weather during May half-term (score 84) and its weakest during the Christmas holidays (score 27).
- 65
Easter holidays
Mar – Apr
Good
- 16 °C by day
- 6.2 h of sun a day
- 11 rainy days a month
- 84
May half-term
May – Jun
ExcellentBest holidays
- 22 °C by day
- 8.1 h of sun a day
- 10 rainy days a month
Good for: Sightseeing & walks
- 81
Summer holidays
Jul – Aug
Excellent
- 29 °C by day
- 9.6 h of sun a day
- 6 rainy days a month
- 75
October half-term
Oct
Good
- 19 °C by day
- 5.1 h of sun a day
- 10 rainy days a month
Good for: Sightseeing & walks
- 27
Christmas holidays
Dec – Jan
Poor
- 9 °C by day
- 4.1 h of sun a day
- 10 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 2 h
- Distance
- 1,270 km
- Time zone
- UTC+2
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Siena
When is the best time to visit Siena?
The best time to visit Siena is from May to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Siena?
July is the warmest month, with average highs of 29 °C and nights around 18 °C. January is the coolest month at 9 °C.
When does it rain most in Siena?
The wettest month is November with 121 mm of precipitation. The driest month is July with 31 mm.
How many hours of sunshine does Siena get?
Siena gets around 2,390 hours of sunshine a year. The sunniest month is July with 10.1 hours a day; in December there are 4.0 hours a day.
What time zone is Siena in?
Siena uses the time zone Europe/Rome: UTC+1 in January and UTC+2 in July.
How long is the flight from London to Siena?
A nonstop flight from London to Siena takes about 2 h, for a straight-line distance of about 1,270 km.
Which school holidays are best for Siena?
Siena has its best school-holiday weather during May half-term (score 84) and its weakest during the Christmas holidays (score 27). Holiday ratings (0–100): Easter holidays 65, May half-term 84, Summer holidays 81, October half-term 75, Christmas holidays 27.
Near Siena
Other destinations close by.
Places with a climate like Siena
Destinations whose weather through the year is closest to Siena's – good alternatives.