Hiroshima, Japan experiences average highs of 20°C (68°F) and lows of 13°C (55°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Average highs have stayed broadly stable across the available records.
Hiroshima, Japan Weather & Climate 2026
Monthly climate averages for Hiroshima, Japan. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.6/10
Best: May, June, October
UV Index
5
Low
Temperature 20°C / 13°C
Feels Like 20°C / 13°C
Rainy Days 11
Rainfall 141 mm
Sunshine 8 h
Humidity 77%
Wind Speed 13 km/h
Dew Point 12°C
Snow Days 6 days
Frost Days 3 days
Hottest Month
32°C
August
Avg Low25°C
Rain14days
Coldest Month
2°C
January
Avg High9°C
Rain8days
Driest Month
7days
November
Avg High17°C
Avg Low9°C
Windiest Month
15 km/h
January (Gusts 40)
Sea Temperature
10°C – 29°C
Warmest water: August (
29°C
)
Worst Time to Visit
Consider avoiding January, February, August, December due to less favorable weather conditions.
Sun Position
Sunrise 04:59
Daylight 14.4h
Sunset 19:25
Live conditions—
Hiroshima on the map · live conditions
Hiroshima, Japan
- Continent
- Asia
- Country
- Japan
- City
- Hiroshima
- Population
- 1.2M
- Coordinates
- 34.40°, 132.45°
Seasonal Breakdown
Spring
Mar–May
Avg High 19°C
Avg Low 10°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 29°C
Avg Low 23°C
Rain 15 days/mo
1/3 best months
Autumn
Sep–Nov
Avg High 22°C
Avg Low 15°C
Rain 10 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 10°C
Avg Low 3°C
Rain 8 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 9°C / 2°C . Feb: 10°C / 2°C . Mar: 14°C / 6°C . Apr: 19°C / 10°C . May: 23°C / 15°C . Jun: 26°C / 19°C . Jul: 30°C / 24°C . Aug: 32°C / 25°C . Sep: 28°C / 22°C . Oct: 22°C / 15°C . Nov: 17°C / 9°C . Dec: 11°C / 4°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 57 mm. Feb: 70 mm. Mar: 114 mm. Apr: 135 mm. May: 147 mm. Jun: 227 mm. Jul: 279 mm. Aug: 214 mm. Sep: 217 mm. Oct: 110 mm. Nov: 60 mm. Dec: 59 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 74%. Feb: 73%. Mar: 73%. Apr: 73%. May: 75%. Jun: 82%. Jul: 85%. Aug: 80%. Sep: 82%. Oct: 77%. Nov: 77%. Dec: 75%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 15 km/h . Mar: 14 km/h . Apr: 14 km/h . May: 12 km/h . Jun: 12 km/h . Jul: 12 km/h . Aug: 12 km/h . Sep: 12 km/h . Oct: 12 km/h . Nov: 13 km/h . Dec: 15 km/h .
Sunshine
Sunshine
Sunshine: Jan: 7h. Feb: 8h. Mar: 9h. Apr: 9h. May: 9h. Jun: 9h. Jul: 10h. Aug: 10h. Sep: 8h. Oct: 8h. Nov: 8h. Dec: 7h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 12°C . Feb: 10°C . Mar: 11°C . Apr: 14°C . May: 18°C . Jun: 22°C . Jul: 27°C . Aug: 29°C . Sep: 28°C . Oct: 24°C . Nov: 20°C . Dec: 15°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 4. Mar: UV 5. Apr: UV 6. May: UV 6. Jun: UV 6. Jul: UV 7. Aug: UV 7. Sep: UV 6. Oct: UV 5. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 9 days. Feb: 8 days. Mar: 3 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 5 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 45 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 32°C | Aug · 32°C |
| Coldest month | Feb 2025 · 0°C | Jan · 2°C |
| Wettest month | Jun 2025 · 258 mm | Jul · 279 mm |
| Windiest month | Feb 2025 · 16 km/h | Jan · 15 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May best
Excellent June best
Excellent July
Wet August
Wet September
Wet October best
Excellent November
Good December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 9°C / 2°C | 5°C / -1°C | 8days (57 mm) Wet | 7.3h Good | 74% Muggy | 3.3 Moderate | Poor | View Details |
| February | 10°C / 2°C | 6°C / -1°C | 9days (70 mm) Wet | 7.8h Good | 73% Muggy | 3.9 Moderate | Poor | View Details |
| March | 14°C / 6°C | 12°C / 3°C | 11days (114 mm) Wet | 8.5h Good | 73% Muggy | 5 Moderate | Fair | View Details |
| April | 19°C / 10°C | 19°C / 9°C | 10days (135 mm) Wet | 8.9h Good | 73% Muggy | 6.1 High | Good | View Details |
| May best | 23°C / 15°C | 24°C / 15°C | 11days (147 mm) Wet | 9.1h Good | 75% Muggy | 6.3 High | Excellent | View Details |
| June best | 26°C / 19°C | 29°C / 22°C | 15days (227 mm) Wet | 8.5h Good | 82% Humid | 6.4 High | Excellent | View Details |
| July | 30°C / 24°C | 35°C / 29°C | 16days (279 mm) Wet | 9.5h Good | 85% Humid | 7.3 Very High | Wet | View Details |
| August | 32°C / 25°C | 37°C / 30°C | 14days (214 mm) Wet | 10.3h Excellent | 80% Humid | 7.3 Very High | Wet | View Details |
| September | 28°C / 22°C | 31°C / 25°C | 15days (217 mm) Wet | 8.1h Good | 82% Humid | 6.2 High | Wet | View Details |
| October best | 22°C / 15°C | 23°C / 15°C | 9days (110 mm) Wet | 7.8h Good | 77% Humid | 4.8 Moderate | Excellent | View Details |
| November | 17°C / 9°C | 15°C / 8°C | 7days (60 mm) Good | 7.9h Good | 77% Humid | 3.8 Moderate | Good | View Details |
| December | 11°C / 4°C | 8°C / 1°C | 8days (59 mm) Wet | 6.9h Fair | 75% Muggy | 3.1 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Hiroshima are May, June, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Hiroshima, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Hiroshima is August, with average daytime highs of 32°C (89°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Hiroshima is January, with average overnight lows of 2°C (36°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Hiroshima is July, averaging 279mm of precipitation across 16 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Hiroshima runs through July, June, September, August, with the heaviest rainfall in July. Based on 10-year averages for Hiroshima.
Hiroshima receives approximately 101 sunshine hours per year. The sunniest month is August with around 10 hours. Based on climate data for Hiroshima.
The least favorable months to visit Hiroshima are January, February, August, December, primarily due to less favorable weather conditions. For the best conditions, consider May, June, October instead.
The annual average UV index in Hiroshima is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Hiroshima is 77%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in June, July, August, September, October average 26°C (79°F), which is warm and comfortable for swimming and water activities.
Yes, Hiroshima receives snow. Months with snowfall average 6 snow days and 6 cm (2 in) of accumulation, with about 3 frost days during winter.
Average wind speeds in Hiroshima are 13 km/h (8 mph). The windiest month is January with peak winds reaching 15 km/h (9 mph) (gusts up to 40 km/h / 25 mph).
Hiroshima averages 3 clear-sky days per month with overall cloud cover around 62%. The clearest skies occur in October.
The annual average dew point in Hiroshima is 12°C (54°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Hiroshima has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Hiroshima ranges from 13°C (55°F) to 20°C (68°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Hiroshima. It earns a climate score of 7.7/10 with Excellent.
For June in Hiroshima, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 26°C (79°F) and 15 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
Last updated: