Peak in August
Coolest in January
Heavy in November
Peak in dry season
Siena Monthly Weather Guide
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January
February
March
April
May
June
July
August
September
October
November
December
Essential Travel Info for Siena
Currency
EUR
€ Euro
Language
Italian
+1 more
Driving
Right side
Safety
High Safety
GPI: 1.643
Best Time to Visit Siena
Location, climate overview & historical trends
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📍 43.3188° N, 11.3308° E
Open in Google MapsSiena is a prominent destination in Italy.
Located at 43.32°N latitude,Siena experiences a temperate climate with four distinct seasons.
Based on 30 years of data, August is the warmest month (avg. 30°C), while January is the coolest. November sees the most rain (30% chance), making July the driest month.
Historical Climate Trend
30-Year Analysis+3.08°C
Total over 30 years
+1.03°C
Per decade
Linear regression analysis of historical maximum temperatures for Siena, based on 1995-2024 satellite data from NASA POWER.
Best Time to Visit
NASA POWER Data (1991-2021)April, May, June
Best months to visit
19°C
Avg High
Based on 30 years of NASA satellite data,Siena receives approximately 514mm of rainfall annually. These months offer optimal temperatures and minimal rain probability for your visit.
Climate Trends
EXCLUSIVE1995-2040 Temperature Trend
1995 Avg
17.7°
2024 Avg
20.4°
2040 Proj
20.9°
+1.03°C
per decade (observed)
+0.33°C
per decade (CMIP6)
🌡️ Siena has warmed by +3.1°C since 1995. By 2040, an additional +0.5°C is projected (based on CMIP6 rate of 0.334°C/decade), for a total of +3.6°C from 1995 baseline.
NASA POWER (1995-2024) + CMIP6 (CMCC_CM2_VHR4, EC_Earth3P_HR, FGOALS_f3_H, HiRAM_SIT_HR, MRI_AGCM3_2_S, NICAM16_8S)
Travel Intelligence
Exclusive flight analytics & health data for Siena
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Airport-to-Airport Logistics
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Flight Connectivity Analysis
Airport traffic data & seasonal patterns
Quieter airport
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Peak
Aug
Low
Jan
Monthly Traffic Distribution
Key Connections
Health & Safety Advisory
CDC travel health recommendations
COVID-19
All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.
Hepatitis A
Consider hepatitis A vaccination for most travelers. It is recommended for travelers who will be doing higher risk activities, such as visiting smaller cities, villages, or rural areas where a traveler might get infected through food or water. It is recommended for travelers who plan on eating street food.
Hepatitis B
Recommended for unvaccinated travelers younger than 60 years old traveling to Italy. Unvaccinated travelers 60 years and older may get vaccinated before traveling to Italy.
Measles
Cases of measles are on the rise worldwide. Travelers are at risk of measles if they have not been fully vaccinated at least two weeks prior to departure, or have not had measles in the past, and travel internationally to areas where measles is spreading.All international travelers should be fully vaccinated against measles with the measles-mumps-rubella (MMR) vaccine, including an early dose for infants 6–11 months, according toCDC’s measles vaccination recommendations for international travel.
Rabies
Dogs infected with rabies are not commonly found in Italy.If rabies exposures occur while in Italy, rabies vaccines are typically available throughout most of the country.Rabies pre-exposure vaccination considerations include whether travelers 1) will be performing occupational or recreational activities that increase risk for exposure to potentially rabid animals and 2) might have difficulty getting prompt access to safe post-exposure prophylaxis.Please consult with a healthcare provider to determine whether you should receive pre-exposure vaccination before travel.For more information, seecountry rabies status assessments.
Tick-borne Encephalitis
For travelers moving or traveling toTBE-endemic areasTBE vaccineis recommended for persons who will haveextensiveexposure to ticks based on their planned outdoor activities and itinerary.TBE vaccine may be considered for persons who might engage in outdoor activities in areas ticks are likely to be found.
+1 more
Source: CDC Travelers' Health
View Complete Health GuideSiena Climate Data by Month
Historical temperature and precipitation averages
| Month | Avg High (°C) | Rain Probability (%) | Status |
|---|---|---|---|
| January | 9°C | 21% | Neutral |
| February | 11°C | 24% | Neutral |
| March | 14°C | 22% | Neutral |
| April | 17°C | 26% | 😊 Pleasant |
| May | 22°C | 24% | ✨ Perfect |
| June | 27°C | 15% | ✨ Perfect |
| July | 30°C | 9% | 😊 Pleasant |
| August | 30°C | 12% | 😊 Pleasant |
| September | 25°C | 23% | ✨ Perfect |
| October | 20°C | 23% | ✨ Perfect |
| November | 14°C | 30% | Neutral |
| December | 10°C | 25% | Neutral |
Weather in Cities Near Siena
Explore climate data for popular destinations within easy reach
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Compare weather conditions with nearby destinations for your trip planning
Compare Siena Weather vs Popular Destinations
Similar Climate Destinations
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These destinations share similar weather patterns with Siena. Perfect alternatives if you're looking for the same climate in a different location.
Siena Weather FAQ
When is the best time to visit Siena?
Honestly, look for months with mild temperatures (20°C-25°C) and low rain chance. Based on historical data, April, May, June are usually great choices.
When is the hottest month in Siena?
August is historically the hottest month in Siena with average highs of 30°C.
When does it rain the most in Siena?
November typically sees the highest probability of rain (30%).
Is Siena expensive?
Prices vary by season. The "Perfect" weather months usually coincide with peak tourist season and higher prices, while the rainy or cold months offer better deals.