Tsuma, Japan experiences average highs of 21°C (70°F) and lows of 15°C (59°F) throughout the year. Rainfall is frequent, averaging about 13 rainy days per month. Average highs have stayed broadly stable across the available records.
Tsuma, Japan Weather & Climate 2026
Monthly climate averages for Tsuma, Japan. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6/10
Best: April, May, October, November
UV Index
5
Low
Temperature 21°C / 15°C
Feels Like 22°C / 15°C
Rainy Days 13
Rainfall 185 mm
Sunshine 8 h
Humidity 80%
Wind Speed 12 km/h
Dew Point 14°C
Frost Days 2 days
Hottest Month
30°C
August
Avg Low25°C
Rain17days
Coldest Month
5°C
January
Avg High12°C
Rain6days
Driest Month
6days
January
Avg High12°C
Avg Low5°C
Windiest Month
13 km/h
February (Gusts 34)
Sea Temperature
17°C – 29°C
Warmest water: August (
29.4°C
)
Worst Time to Visit
Consider avoiding July, August due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 05:09
Daylight 14.2h
Sunset 19:23
Live conditions—
Tsuma on the map · live conditions
Tsuma, Japan
- Continent
- Asia
- Country
- Japan
- City
- Tsuma
- Population
- 34.3K
- Coordinates
- 32.10°, 131.40°
Seasonal Breakdown
Spring
Mar–May
Avg High 20°C
Avg Low 13°C
Rain 13 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 28°C
Avg Low 23°C
Rain 18 days/mo
Autumn
Sep–Nov
Avg High 23°C
Avg Low 18°C
Rain 13 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 12°C
Avg Low 5°C
Rain 7 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: 12°C / 5°C . Feb: 13°C / 5°C . Mar: 16°C / 9°C . Apr: 20°C / 13°C . May: 23°C / 16°C . Jun: 26°C / 21°C . Jul: 29°C / 24°C . Aug: 30°C / 25°C . Sep: 28°C / 23°C . Oct: 23°C / 18°C . Nov: 19°C / 12°C . Dec: 13°C / 6°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 61 mm. Feb: 104 mm. Mar: 150 mm. Apr: 147 mm. May: 234 mm. Jun: 310 mm. Jul: 303 mm. Aug: 262 mm. Sep: 330 mm. Oct: 187 mm. Nov: 79 mm. Dec: 50 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 73%. Feb: 72%. Mar: 75%. Apr: 78%. May: 81%. Jun: 87%. Jul: 88%. Aug: 86%. Sep: 85%. Oct: 79%. Nov: 77%. Dec: 74%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 12 km/h . Feb: 13 km/h . Mar: 13 km/h . Apr: 12 km/h . May: 12 km/h . Jun: 12 km/h . Jul: 12 km/h . Aug: 12 km/h . Sep: 13 km/h . Oct: 12 km/h . Nov: 11 km/h . Dec: 11 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 8h. Mar: 8h. Apr: 8h. May: 8h. Jun: 7h. Jul: 9h. Aug: 10h. Sep: 8h. Oct: 8h. Nov: 8h. Dec: 8h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 17°C . Feb: 17°C . Mar: 18°C . Apr: 19°C . May: 21°C . Jun: 24°C . Jul: 27°C . Aug: 29°C . Sep: 29°C . Oct: 26°C . Nov: 23°C . Dec: 19°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 4. Feb: UV 4. Mar: UV 5. Apr: UV 6. May: UV 6. Jun: UV 6. Jul: UV 8. Aug: UV 7. Sep: UV 7. Oct: UV 5. Nov: UV 4. Dec: UV 4.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 64 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 31°C | Aug · 30°C |
| Coldest month | Feb 2025 · 3°C | Jan · 5°C |
| Wettest month | Jul 2025 · 283 mm | Sep · 330 mm |
| Windiest month | Mar 2025 · 14 km/h | Feb · 13 km/h |
Month-by-Month Weather Table
January
Fair 
February
Fair March
Good April best
Good May best
Excellent June
Wet July
Wet August
Wet September
Wet October best
Excellent November best
Good December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 12°C / 5°C | 9°C / 2°C | 6days (61 mm) Good | 7.6h Good | 73% Muggy | 4 Moderate | Fair | View Details |
| February | 13°C / 5°C | 10°C / 3°C | 9days (104 mm) Wet | 7.7h Good | 72% Muggy | 4.3 Moderate | Fair | View Details |
| March | 16°C / 9°C | 15°C / 7°C | 12days (150 mm) Wet | 8h Good | 75% Muggy | 5.1 High | Good | View Details |
| April best | 20°C / 13°C | 20°C / 12°C | 12days (147 mm) Wet | 8.4h Good | 78% Humid | 5.6 High | Good | View Details |
| May best | 23°C / 16°C | 25°C / 17°C | 14days (234 mm) Wet | 8h Good | 81% Humid | 6 High | Excellent | View Details |
| June | 26°C / 21°C | 30°C / 23°C | 18days (310 mm) Wet | 7.1h Good | 87% Very Muggy | 6 High | Wet | View Details |
| July | 29°C / 24°C | 35°C / 29°C | 20days (303 mm) Wet | 9.2h Good | 88% Very Muggy | 7.5 Very High | Wet | View Details |
| August | 30°C / 25°C | 36°C / 30°C | 17days (262 mm) Wet | 9.8h Good | 86% Very Muggy | 7.2 Very High | Wet | View Details |
| September | 28°C / 23°C | 32°C / 27°C | 19days (330 mm) Wet | 8.2h Good | 85% Humid | 6.5 High | Wet | View Details |
| October best | 23°C / 18°C | 25°C / 19°C | 12days (187 mm) Wet | 7.6h Good | 79% Humid | 4.7 Moderate | Excellent | View Details |
| November best | 19°C / 12°C | 18°C / 11°C | 8days (79 mm) Wet | 7.8h Good | 77% Humid | 4 Moderate | Good | View Details |
| December | 13°C / 6°C | 11°C / 4°C | 6days (50 mm) Good | 7.5h Good | 74% Muggy | 3.6 Moderate | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Tsuma are April, May, October, November, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Tsuma, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Tsuma is August, with average daytime highs of 30°C (86°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Tsuma is January, with average overnight lows of 5°C (40°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Tsuma is September, averaging 330mm of precipitation across 19 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Tsuma runs through July, September, June, August, with the heaviest rainfall in July. Based on 10-year averages for Tsuma.
Tsuma receives approximately 97 sunshine hours per year. The sunniest month is August with around 10 hours. Based on climate data for Tsuma.
The least favorable months to visit Tsuma are July, August, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider April, May, October, November instead.
The annual average UV index in Tsuma is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Tsuma is 80%, 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, November average 26°C (79°F), which is warm and comfortable for swimming and water activities.
Tsuma rarely sees significant snowfall but does experience frost, averaging 2 frost days during the colder months.
Average wind speeds in Tsuma are 12 km/h (7 mph). The windiest month is February with peak winds reaching 13 km/h (8 mph) (gusts up to 34 km/h / 21 mph).
Tsuma averages 5 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in December.
The annual average dew point in Tsuma is 14°C (57°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Tsuma 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 Tsuma ranges from 15°C (59°F) to 22°C (72°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
June is not the best time to visit Tsuma, with a climate score of 6.6/10. Consider visiting during April, May, October, November instead for better conditions.
For June in Tsuma, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 26°C (78°F) and 18 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.
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