What is the weather like in Siena throughout the year?

Siena experiences varying weather throughout the year. The warmest month is August with average highs of 30°C. The coolest month is January.

What is the weather like in Siena in May?

Siena in May scores 65/100 based on 30 years of climate data. Recommended for planning your trip.

Who should visit Siena in May?

May in Siena is ideal for: Families with children, Elderly travelers, Outdoor enthusiasts, Cultural tourists, Honeymoon couples.

Best Time to Visit Siena | 30-Year Weather Analysis

Why May is the Best Time to Visit Siena

Is May a Good Time to Visit Siena?

👍Recommended for planning your trip(65/100)

Short Answer

May is Siena's peak season for good reason: 22°C temperatures and 24% rain probability. But expect crowds (98% of annual maximum) and premium prices.

Decision Factors

Vaccinations required

Yellow Fever

Peak tourist season

98% of annual peak - expect crowds and peak prices

Ideal temperature range

21.5°C - perfect for sightseeing and outdoor activities

Health precautions needed

Be aware of: Leptospirosis, Leishmaniasis, Hantavirus

Plenty of sunshine

11.7h of sunshine daily

Rich cultural heritage

4 UNESCO World Heritage sites nearby

Good For

👨‍👩‍👧‍👦
Families with children
Comfortable 21.5°C temperatures and low 24% rain risk
👴
Elderly travelers
Comfortable 21.5°C temperature range with manageable humidity
🥾
Outdoor enthusiasts
Ideal hiking conditions: 21.5°C, 24% rain chance
🏛️
Cultural tourists
Comfortable conditions for exploring museums and sites
💑
Honeymoon couples
Wedding score 97/100 with romantic weather conditions

Who Should Avoid

💰
Budget travelers
Peak season means premium prices everywhere

Warmest

August

30°C avg

Coolest

January

9°C avg

Driest

July

9% rain

Wettest

November

30% rain

Planning Your Trip to Siena, Italy

Wondering when is the best time to visit Siena? Based on our analysis of 30 years of NASA satellite weather data, the ideal months to travel to Siena are May, September, October. During these months, you'll experience optimal temperatures around 22°C with only 24% chance of rain.

The Siena climate varies throughout the year. August is the hottest month with average highs of 30°C, while January is the coldest at 9°C. If you're planning outdoor activities or sightseeing in Siena, avoid November when rainfall peaks at 30% probability.

For the best Siena weather experience, we recommend visiting during July for the driest conditions or the shoulder months of May and September for a perfect balance of weather and fewer crowds.

Siena Weather by Month: Climate Guide

Click any month to explore detailed daily forecasts for Siena

🏆 85-100: Excellent👍 70-84: Great👌 55-69: Good🤔 40-54: Fair⚠️ 0-39: Challenging

When to Visit Siena: Travel Style Guide

Personalized Siena travel recommendations based on 30-year weather data

Beach Lovers

Warmest months with comfortable temperatures for outdoor activities

JulyAugustJune

Budget Travelers

Shoulder season with good weather and lower prices

FebruaryMarchApril

Avoiding Crowds

Fewer tourists with acceptable weather conditions

JanuaryFebruaryMarch

Photography

Best light conditions with clear skies

JuneMarchSeptember

Winter Escape

Escape the cold with warmest temperatures

JuneJulyAugust

Honeymoon

Perfect conditions for a romantic getaway

MayJuneJuly

Siena Weather FAQ: Your Questions Answered

What is the best time to visit Siena?

Based on 30 years of weather data, the best months to visit Siena are May, September, October. These months offer the optimal combination of pleasant temperatures (22°C avg) and low rainfall (24% chance).

When is the hottest time of year in Siena?

August is historically the warmest month in Siena with average highs of 30°C. If you prefer cooler weather, consider visiting in January when temperatures average around 9°C.

When is the rainy season in Siena?

November typically sees the most rainfall in Siena with a 30% chance of rain. For the driest conditions, plan your visit in July when rain probability drops to just 9%.

How accurate is the Siena weather forecast?

Our Siena climate analysis is based on 30 years of NASA POWER satellite observations (1995-2024), providing highly accurate historical averages. While weather can vary year to year, these long-term patterns are excellent indicators for planning your trip to Siena.

What should I pack for Siena?

Packing depends on when you visit. In August (warmest month), pack light summer clothes for 30°C weather. In January (coolest month), bring layers for 9°C temperatures.

Is Siena good for a destination wedding?

Yes! The best months for an outdoor wedding in Siena are July (only 9% rain chance) and May for optimal weather conditions. Avoid November when rain probability peaks at 30%.