Rusutsu, Japan experiences average highs of 10°C (50°F) and lows of 3°C (37°F) throughout the year. Rainfall is frequent, averaging about 14 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 1.8°C (3.2°F) across the available records.
Rusutsu, Japan Weather & Climate 2026
Monthly climate averages for Rusutsu, Japan. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Sep 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.3/10
Best: June, July, August, September
UV Index
4
Low
Temperature 10°C / 3°C
Feels Like 9°C / 1°C
Rainy Days 14
Rainfall 100 mm
Sunshine 9 h
Humidity 82%
Wind Speed 14 km/h
Dew Point 4°C
Snow Days 15 days
Frost Days 21 days
Hottest Month
24°C
August
Avg Low18°C
Rain15days
Coldest Month
-10°C
January
Avg High-3°C
Rain16days
Driest Month
12days
March
Avg High3°C
Avg Low-4°C
Windiest Month
16 km/h
November (Gusts 50)
Sea Temperature
4°C – 25°C
Warmest water: August (
24.7°C
)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures, heavy rainfall.
Sun Position
Sunrise 03:59
Daylight 15.3h
Sunset 19:17
Live conditions—
Rusutsu on the map · live conditions
Rusutsu, Japan
- Continent
- Asia
- Country
- Japan
- City
- Rusutsu
- Population
- 1.9K
- Coordinates
- 42.73°, 140.87°
Seasonal Breakdown
Spring
Mar–May
Avg High 9°C
Avg Low 1°C
Rain 12 days/mo
Summer
Jun–Aug
Avg High 22°C
Avg Low 15°C
Rain 14 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 13°C
Avg Low 6°C
Rain 14 days/mo
1/3 best months
Winter
Dec–Feb
Avg High -3°C
Avg Low -9°C
Rain 16 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: -3°C / -10°C . Feb: -3°C / -9°C . Mar: 3°C / -4°C . Apr: 9°C / 1°C . May: 16°C / 7°C . Jun: 19°C / 12°C . Jul: 24°C / 17°C . Aug: 24°C / 18°C . Sep: 20°C / 13°C . Oct: 13°C / 6°C . Nov: 6°C / 0°C . Dec: -2°C / -8°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 67 mm. Feb: 60 mm. Mar: 73 mm. Apr: 80 mm. May: 85 mm. Jun: 116 mm. Jul: 118 mm. Aug: 183 mm. Sep: 127 mm. Oct: 101 mm. Nov: 107 mm. Dec: 81 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 81%. Feb: 79%. Mar: 80%. Apr: 77%. May: 78%. Jun: 84%. Jul: 87%. Aug: 87%. Sep: 84%. Oct: 81%. Nov: 81%. Dec: 80%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 15 km/h . Mar: 15 km/h . Apr: 15 km/h . May: 14 km/h . Jun: 12 km/h . Jul: 11 km/h . Aug: 12 km/h . Sep: 12 km/h . Oct: 14 km/h . Nov: 16 km/h . Dec: 16 km/h .
Sunshine
Sunshine
Sunshine: Jan: 7h. Feb: 8h. Mar: 9h. Apr: 10h. May: 10h. Jun: 10h. Jul: 10h. Aug: 9h. Sep: 9h. Oct: 8h. Nov: 7h. Dec: 6h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 6°C . Feb: 4°C . Mar: 4°C . Apr: 6°C . May: 11°C . Jun: 16°C . Jul: 22°C . Aug: 25°C . Sep: 24°C . Oct: 19°C . Nov: 13°C . Dec: 9°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 6. Jul: UV 6. Aug: UV 5. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 25 days. Feb: 23 days. Mar: 19 days. Apr: 9 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 2 days. Nov: 15 days. Dec: 28 days.
Climate Trends
Average highs have warmed by 1.8°C (3.2°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 26°C | Aug · 24°C |
| Coldest month | Jan 2025 · -9°C | Jan · -10°C |
| Wettest month | Sep 2025 · 249 mm | Aug · 183 mm |
| Windiest month | Dec 2025 · 16 km/h | Nov · 16 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May
Fair June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Fair November
Poor December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -3°C / -10°C | -8°C / -14°C | 16days (67 mm) Wet | 6.9h Fair | 81% Humid | 2.1 Moderate | Poor | View Details |
| February | -3°C / -9°C | -7°C / -13°C | 13days (60 mm) Wet | 8.1h Good | 79% Humid | 3.1 Moderate | Poor | View Details |
| March | 3°C / -4°C | -1°C / -8°C | 12days (73 mm) Wet | 9.1h Good | 80% Humid | 4.2 Moderate | Poor | View Details |
| April | 9°C / 1°C | 6°C / -2°C | 12days (80 mm) Wet | 9.7h Good | 77% Humid | 4.9 Moderate | Poor | View Details |
| May | 16°C / 7°C | 15°C / 5°C | 13days (85 mm) Wet | 10.3h Excellent | 78% Humid | 5.9 High | Fair | View Details |
| June best | 19°C / 12°C | 20°C / 11°C | 14days (116 mm) Wet | 10h Excellent | 84% Humid | 6.1 High | Excellent | View Details |
| July best | 24°C / 17°C | 26°C / 18°C | 13days (118 mm) Wet | 9.7h Good | 87% Very Muggy | 6 High | Excellent | View Details |
| August best | 24°C / 18°C | 26°C / 20°C | 15days (183 mm) Wet | 8.5h Good | 87% Very Muggy | 5.4 High | Excellent | View Details |
| September best | 20°C / 13°C | 21°C / 14°C | 12days (127 mm) Wet | 8.6h Good | 84% Humid | 4.8 Moderate | Excellent | View Details |
| October | 13°C / 6°C | 11°C / 4°C | 14days (101 mm) Wet | 8.1h Good | 81% Humid | 3.4 Moderate | Fair | View Details |
| November | 6°C / 0°C | 2°C / -4°C | 17days (107 mm) Wet | 7h Good | 81% Humid | 2.2 Moderate | Poor | View Details |
| December | -2°C / -8°C | -6°C / -12°C | 20days (81 mm) Wet | 6.1h Fair | 80% Humid | 1.8 Low | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Rusutsu are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Rusutsu, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Rusutsu is August, with average daytime highs of 24°C (75°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Rusutsu is January, with average overnight lows of -10°C (14°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Rusutsu is August, averaging 183mm of precipitation across 15 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Rusutsu runs through December, November, January, August, with the heaviest rainfall in December. Based on 10-year averages for Rusutsu.
Rusutsu receives approximately 102 sunshine hours per year. The sunniest month is May with around 10 hours. Based on climate data for Rusutsu.
The least favorable months to visit Rusutsu are January, February, November, December, primarily due to very cold temperatures, heavy rainfall. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Rusutsu is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Rusutsu is 82%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes — sea temperatures in August, September average 24°C (75°F), which is warm and comfortable for swimming and water activities.
Yes, Rusutsu receives snow. Months with snowfall average 15 snow days and 26 cm (10 in) of accumulation, with about 21 frost days during winter.
Average wind speeds in Rusutsu are 14 km/h (9 mph). The windiest month is November with peak winds reaching 16 km/h (10 mph) (gusts up to 50 km/h / 31 mph).
Rusutsu averages 1 clear-sky days per month with overall cloud cover around 68%. The clearest skies occur in May.
The annual average dew point in Rusutsu is 4°C (39°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Rusutsu has a Warm-Summer Continental climate, classified as Dfb under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Rusutsu ranges from 1°C (34°F) to 9°C (48°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 Rusutsu. It earns a climate score of 7.6/10 with Excellent.
For June in Rusutsu, pack Warm evening layer, Umbrella, Waterproof jacket, Waterproof shoes. With average highs of 19°C (67°F) and 14 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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