Tamaru, Japan experiences average highs of 20°C (68°F) and lows of 14°C (57°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have stayed broadly stable across the available records.
Tamaru, Japan Weather & Climate 2026
Monthly climate averages for Tamaru, Japan. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.8/10
Best: May, June, October, November
UV Index
5
Low
Temperature 20°C / 14°C
Feels Like 20°C / 13°C
Rainy Days 11
Rainfall 157 mm
Sunshine 9 h
Humidity 76%
Wind Speed 21 km/h
Dew Point 13°C
Snow Days 1 days
Frost Days 2 days
Hottest Month
31°C
August
Avg Low25°C
Rain15days
Coldest Month
3°C
January
Avg High9°C
Rain5days
Driest Month
5days
January
Avg High9°C
Avg Low3°C
Windiest Month
25 km/h
January (Gusts 50)
Sea Temperature
9°C – 28°C
Warmest water: August (
28.4°C
)
Worst Time to Visit
Consider avoiding January, July, August due to frequent rain.
Sun Position
Sunrise 04:42
Daylight 14.4h
Sunset 19:09
Live conditions—
Tamaru on the map · live conditions
Tamaru, Japan
- Continent
- Asia
- Country
- Japan
- City
- Tamaru
- Population
- 15K
- Coordinates
- 34.48°, 136.63°
Seasonal Breakdown
Spring
Mar–May
Avg High 19°C
Avg Low 11°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 17°C
Rain 13 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 10°C
Avg Low 4°C
Rain 6 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 / 3°C . Feb: 10°C / 4°C . Mar: 15°C / 7°C . Apr: 19°C / 11°C . May: 23°C / 15°C . Jun: 26°C / 20°C . Jul: 30°C / 24°C . Aug: 31°C / 25°C . Sep: 28°C / 23°C . Oct: 22°C / 17°C . Nov: 17°C / 11°C . Dec: 12°C / 6°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 57 mm. Feb: 68 mm. Mar: 126 mm. Apr: 144 mm. May: 184 mm. Jun: 278 mm. Jul: 201 mm. Aug: 177 mm. Sep: 225 mm. Oct: 268 mm. Nov: 95 mm. Dec: 66 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 67%. Feb: 67%. Mar: 70%. Apr: 73%. May: 77%. Jun: 83%. Jul: 85%. Aug: 82%. Sep: 83%. Oct: 79%. Nov: 74%. Dec: 70%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 25 km/h . Feb: 25 km/h . Mar: 24 km/h . Apr: 23 km/h . May: 20 km/h . Jun: 19 km/h . Jul: 17 km/h . Aug: 18 km/h . Sep: 19 km/h . Oct: 21 km/h . Nov: 22 km/h . Dec: 24 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 8h. Mar: 9h. Apr: 9h. May: 9h. Jun: 9h. Jul: 10h. Aug: 11h. Sep: 9h. Oct: 8h. Nov: 8h. Dec: 8h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 10°C . Feb: 9°C . Mar: 11°C . Apr: 14°C . May: 18°C . Jun: 22°C . Jul: 28°C . Aug: 28°C . Sep: 28°C . Oct: 24°C . Nov: 19°C . Dec: 14°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 8. Aug: UV 7. Sep: UV 6. Oct: UV 4. 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: 1 days. Feb: 0 days. Mar: 0 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: 0 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 36 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 33°C | Aug · 31°C |
| Coldest month | Feb 2025 · 2°C | Jan · 3°C |
| Wettest month | May 2025 · 283 mm | Jun · 278 mm |
| Windiest month | Feb 2025 · 27 km/h | Jan · 25 km/h |
Month-by-Month Weather Table
January
Poor 
February
Fair March
Fair April
Good May best
Excellent June best
Excellent July
Wet August
Poor September
Wet October best
Excellent November best
Good December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 9°C / 3°C | 5°C / -1°C | 5days (57 mm) Good | 7.9h Good | 67% Muggy | 3.4 Moderate | Poor | View Details |
| February | 10°C / 4°C | 6°C / -1°C | 6days (68 mm) Good | 8.4h Good | 67% Muggy | 4.1 Moderate | Fair | View Details |
| March | 15°C / 7°C | 12°C / 3°C | 11days (126 mm) Wet | 8.6h Good | 70% Muggy | 5 Moderate | Fair | View Details |
| April | 19°C / 11°C | 18°C / 9°C | 11days (144 mm) Wet | 9.1h Good | 73% Muggy | 5.8 High | Good | View Details |
| May best | 23°C / 15°C | 24°C / 15°C | 12days (184 mm) Wet | 9.2h Good | 77% Humid | 5.9 High | Excellent | View Details |
| June best | 26°C / 20°C | 29°C / 21°C | 15days (278 mm) Wet | 8.9h Good | 83% Humid | 6.3 High | Excellent | View Details |
| July | 30°C / 24°C | 35°C / 28°C | 15days (201 mm) Wet | 9.7h Good | 85% Humid | 7.7 Very High | Wet | View Details |
| August | 31°C / 25°C | 36°C / 30°C | 15days (177 mm) Wet | 10.6h Excellent | 82% Humid | 7.2 Very High | Poor | View Details |
| September | 28°C / 23°C | 31°C / 25°C | 17days (225 mm) Wet | 8.7h Good | 83% Humid | 6.2 High | Wet | View Details |
| October best | 22°C / 17°C | 22°C / 16°C | 14days (268 mm) Wet | 7.5h Good | 79% Humid | 4.2 Moderate | Excellent | View Details |
| November best | 17°C / 11°C | 15°C / 8°C | 8days (95 mm) Wet | 7.7h Good | 74% Muggy | 3.6 Moderate | Good | View Details |
| December | 12°C / 6°C | 8°C / 1°C | 6days (66 mm) Good | 7.8h Good | 70% Muggy | 3.1 Moderate | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Tamaru are May, June, October, November, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Tamaru, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Tamaru is August, with average daytime highs of 31°C (88°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Tamaru is January, with average overnight lows of 3°C (38°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Tamaru is June, averaging 278mm of precipitation across 15 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Tamaru runs through September, June, July, August, with the heaviest rainfall in September. Based on 10-year averages for Tamaru.
Tamaru receives approximately 104 sunshine hours per year. The sunniest month is August with around 11 hours. Based on climate data for Tamaru.
The least favorable months to visit Tamaru are January, July, August, primarily due to frequent rain. For the best conditions, consider May, June, October, November instead.
The annual average UV index in Tamaru is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Tamaru is 76%, 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, Tamaru receives snow. Months with snowfall average 1 snow days and 0 cm (0 in) of accumulation, with about 2 frost days during winter.
Average wind speeds in Tamaru are 21 km/h (13 mph). The windiest month is January with peak winds reaching 25 km/h (16 mph) (gusts up to 50 km/h / 31 mph).
Tamaru averages 6 clear-sky days per month with overall cloud cover around 54%. The clearest skies occur in December.
The annual average dew point in Tamaru is 13°C (55°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Tamaru 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 Tamaru 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 Tamaru. It earns a climate score of 7.7/10 with Excellent.
For June in Tamaru, 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.
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