Ōtsuchi, Japan experiences average highs of 15°C (59°F) and lows of 11°C (52°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Average highs have warmed by 1.2°C (2.2°F) across the available records.
Ōtsuchi, Japan Weather & Climate 2026
Monthly climate averages for Ōtsuchi, 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
5.2/10
Best: May, June, July, September, October
UV Index
5
Low
Temperature 15°C / 11°C
Feels Like 14°C / 9°C
Rainy Days 12
Rainfall 119 mm
Sunshine 8 h
Humidity 75%
Wind Speed 19 km/h
Dew Point 9°C
Snow Days 7 days
Frost Days 10 days
Hottest Month
26°C
August
Avg Low 23°C
Rain 19 days
Coldest Month
0°C
February
Avg High 5°C
Rain 8 days
Driest Month
7 days
January
Avg High 5°C
Avg Low 0°C
Windiest Month
23 km/h
January (Gusts 59)
Sea Temperature
9°C – 25°C
Warmest water: August (
25°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures.
Sun Position
Sunrise 04:05
Daylight 14.9h
Sunset 19:01
Live conditions —
Ōtsuchi on the map · live conditions
Ōtsuchi, Japan
- Continent
- Asia
- Country
- Japan
- City
- Ōtsuchi
- Population
- 11.6K
- Coordinates
- 39.37°, 141.90°
Seasonal Breakdown
Spring
Mar–May
Avg High 13°C
Avg Low 8°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 24°C
Avg Low 20°C
Rain 16 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 18°C
Avg Low 14°C
Rain 11 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 6°C
Avg Low 1°C
Rain 8 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 5°C / 0°C . Feb: 5°C / 0°C . Mar: 9°C / 4°C . Apr: 13°C / 8°C . May: 17°C / 13°C . Jun: 21°C / 17°C . Jul: 25°C / 21°C . Aug: 26°C / 23°C . Sep: 23°C / 20°C . Oct: 18°C / 14°C . Nov: 13°C / 8°C . Dec: 7°C / 3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 50 mm. Feb: 53 mm. Mar: 107 mm. Apr: 117 mm. May: 116 mm. Jun: 125 mm. Jul: 175 mm. Aug: 213 mm. Sep: 183 mm. Oct: 165 mm. Nov: 61 mm. Dec: 62 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 63%. Feb: 64%. Mar: 69%. Apr: 73%. May: 78%. Jun: 86%. Jul: 89%. Aug: 89%. Sep: 84%. Oct: 75%. Nov: 69%. Dec: 65%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 23 km/h . Feb: 23 km/h . Mar: 21 km/h . Apr: 20 km/h . May: 18 km/h . Jun: 16 km/h . Jul: 14 km/h . Aug: 15 km/h . Sep: 16 km/h . Oct: 17 km/h . Nov: 19 km/h . Dec: 22 km/h .
Sunshine
Sunshine
Sunshine: Jan: 7h. Feb: 8h. Mar: 9h. Apr: 9h. May: 9h. Jun: 9h. Jul: 9h. Aug: 9h. Sep: 8h. Oct: 7h. Nov: 8h. Dec: 7h.
Sea Temperature
Sea Temperature swim
Line chart showing monthly sea temperature. Jan: 12°C . Feb: 9°C . Mar: 9°C . Apr: 11°C . May: 12°C . Jun: 16°C . Jul: 21°C . Aug: 25°C . Sep: 24°C . Oct: 21°C . Nov: 17°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 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow Days Snowfall
Snow Days: Jan: 11 days. Feb: 11 days. Mar: 8 days. Apr: 1 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 2 days. Dec: 9 days.
Climate Trends
Average highs have warmed by 1.2°C (2.2°F) across the available records. Average rainfall is trending drier by about 11 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 28°C | Aug · 26°C |
| Coldest month | Feb 2025 · 1°C | Feb · 0°C |
| Wettest month | Sep 2025 · 222 mm | Aug · 213 mm |
| Windiest month | Feb 2025 · 24 km/h | Jan · 23 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May best
Good June best
Excellent July best
Good August
Wet September best
Excellent October best
Good November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 5°C / 0°C | 0°C / -5°C | 7days (50 mm) Good | 7.4h Good | 63% Muggy | 2.6 Moderate | Poor | View Details |
| February | 5°C / 0°C | 0°C / -5°C | 8days (53 mm) Wet | 8.3h Good | 64% Muggy | 3.6 Moderate | Poor | View Details |
| March | 9°C / 4°C | 5°C / 0°C | 10days (107 mm) Wet | 8.6h Good | 69% Muggy | 4.6 Moderate | Poor | View Details |
| April | 13°C / 8°C | 11°C / 5°C | 11days (117 mm) Wet | 9.3h Good | 73% Muggy | 5.4 High | Fair | View Details |
| May best | 17°C / 13°C | 17°C / 11°C | 12days (116 mm) Wet | 9.2h Good | 78% Humid | 5.5 High | Good | View Details |
| June best | 21°C / 17°C | 22°C / 17°C | 13days (125 mm) Wet | 9.2h Good | 86% Very Muggy | 6.5 High | Excellent | View Details |
| July best | 25°C / 21°C | 28°C / 24°C | 16days (175 mm) Wet | 8.7h Good | 89% Very Muggy | 6.7 High | Good | View Details |
| August | 26°C / 23°C | 31°C / 26°C | 19days (213 mm) Wet | 8.5h Good | 89% Very Muggy | 6.5 High | Wet | View Details |
| September best | 23°C / 20°C | 26°C / 21°C | 15days (183 mm) Wet | 7.8h Good | 84% Humid | 5.2 High | Excellent | View Details |
| October best | 18°C / 14°C | 18°C / 12°C | 11days (165 mm) Wet | 7.2h Good | 75% Muggy | 3.9 Moderate | Good | View Details |
| November | 13°C / 8°C | 10°C / 5°C | 8days (61 mm) Wet | 7.5h Good | 69% Muggy | 3 Moderate | Fair | View Details |
| December | 7°C / 3°C | 3°C / -2°C | 10days (62 mm) Wet | 7h Good | 65% Muggy | 2.4 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Ōtsuchi are May, June, July, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Ōtsuchi, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Ōtsuchi is August, with average daytime highs of 26°C (79°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Ōtsuchi is February, with average overnight lows of 0°C (32°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Ōtsuchi is August, averaging 213mm of precipitation across 19 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Ōtsuchi runs through August, July, September, June, with the heaviest rainfall in August. Based on 10-year averages for Ōtsuchi.
Ōtsuchi receives approximately 99 sunshine hours per year. The sunniest month is April with around 9 hours. Based on climate data for Ōtsuchi.
The least favorable months to visit Ōtsuchi are January, February, March, December, primarily due to very cold temperatures. For the best conditions, consider May, June, July, September, October instead.
The annual average UV index in Ōtsuchi is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Ōtsuchi is 75%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in August, September average 25°C (77°F), which is warm and comfortable for swimming and water activities.
Yes, Ōtsuchi receives snow. Months with snowfall average 7 snow days and 11 cm (4 in) of accumulation, with about 10 frost days during winter.
Average wind speeds in Ōtsuchi are 19 km/h (12 mph). The windiest month is January with peak winds reaching 23 km/h (14 mph) (gusts up to 59 km/h / 36 mph).
Ōtsuchi averages 3 clear-sky days per month with overall cloud cover around 62%. The clearest skies occur in November.
The annual average dew point in Ōtsuchi is 9°C (48°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Ōtsuchi 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 Ōtsuchi ranges from 9°C (48°F) to 14°C (57°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 Ōtsuchi. It earns a climate score of 8.3/10 with Excellent.
For June in Ōtsuchi, pack Umbrella, Waterproof jacket, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 21°C (69°F) and 13 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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