Kiso, Japan experiences average highs of 16°C (61°F) and lows of 8°C (46°F) throughout the year. Rainfall is frequent, averaging about 15 rainy days per month. Average highs have stayed broadly stable across the available records.
Kiso, Japan Weather & Climate 2026
Monthly climate averages for Kiso, Japan. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Jun–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.7/10
Best: May, June, September, October
UV Index
5
Low
Temperature 16°C / 8°C
Feels Like 16°C / 7°C
Rainy Days 15
Rainfall 197 mm
Sunshine 8 h
Humidity 78%
Wind Speed 10 km/h
Dew Point 9°C
Snow Days 11 days
Frost Days 14 days
Hottest Month
29°C
August
Avg Low21°C
Rain20days
Coldest Month
-5°C
January
Avg High3°C
Rain12days
Driest Month
11days
November
Avg High13°C
Avg Low5°C
Windiest Month
11 km/h
March (Gusts 50)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 04:34
Daylight 14.6h
Sunset 19:08
Live conditions—
Kiso on the map · live conditions
Kiso, Japan
- Continent
- Asia
- Country
- Japan
- City
- Kiso
- Population
- 10.6K
- Coordinates
- 35.84°, 137.69°
Seasonal Breakdown
Spring
Mar–May
Avg High 15°C
Avg Low 6°C
Rain 14 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 27°C
Avg Low 19°C
Rain 20 days/mo
1/3 best months
Autumn
Sep–Nov
Avg High 19°C
Avg Low 11°C
Rain 15 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 4°C
Avg Low -3°C
Rain 13 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 / -5°C . Feb: 4°C / -4°C . Mar: 9°C / 1°C . Apr: 16°C / 6°C . May: 21°C / 11°C . Jun: 24°C / 16°C . Jul: 27°C / 20°C . Aug: 29°C / 21°C . Sep: 25°C / 18°C . Oct: 19°C / 11°C . Nov: 13°C / 5°C . Dec: 6°C / -1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 100 mm. Feb: 123 mm. Mar: 170 mm. Apr: 200 mm. May: 226 mm. Jun: 283 mm. Jul: 353 mm. Aug: 218 mm. Sep: 249 mm. Oct: 210 mm. Nov: 121 mm. Dec: 108 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 73%. Feb: 71%. Mar: 71%. Apr: 73%. May: 75%. Jun: 82%. Jul: 86%. Aug: 84%. Sep: 84%. Oct: 80%. Nov: 77%. Dec: 75%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 11 km/h . Feb: 11 km/h . Mar: 11 km/h . Apr: 11 km/h . May: 10 km/h . Jun: 9 km/h . Jul: 8 km/h . Aug: 8 km/h . Sep: 8 km/h . Oct: 9 km/h . Nov: 9 km/h . Dec: 10 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 8h. Mar: 8h. Apr: 9h. May: 9h. Jun: 9h. Jul: 9h. Aug: 10h. Sep: 8h. Oct: 7h. Nov: 8h. Dec: 8h.
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 5. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 18 days. Feb: 15 days. Mar: 11 days. Apr: 3 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 4 days. Dec: 16 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 28 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 29°C | Aug · 29°C |
| Coldest month | Feb 2025 · -7°C | Jan · -5°C |
| Wettest month | Jun 2025 · 283 mm | Jul · 353 mm |
| Windiest month | Feb 2025 · 12 km/h | Mar · 11 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Wet May best
Wet June best
Wet July
Wet August
Wet September best
Wet October best
Wet November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 3°C / -5°C | -1°C / -8°C | 12days (100 mm) Wet | 7.8h Good | 73% Muggy | 3.2 Moderate | Poor | View Details |
| February | 4°C / -4°C | 1°C / -8°C | 12days (123 mm) Wet | 8.3h Good | 71% Muggy | 4.1 Moderate | Poor | View Details |
| March | 9°C / 1°C | 7°C / -2°C | 14days (170 mm) Wet | 8.3h Good | 71% Muggy | 5 Moderate | Poor | View Details |
| April | 16°C / 6°C | 14°C / 4°C | 13days (200 mm) Wet | 9h Good | 73% Muggy | 6 High | Wet | View Details |
| May best | 21°C / 11°C | 21°C / 11°C | 14days (226 mm) Wet | 9h Good | 75% Muggy | 6.3 High | Wet | View Details |
| June best | 24°C / 16°C | 26°C / 17°C | 17days (283 mm) Wet | 8.6h Good | 82% Humid | 6.4 High | Wet | View Details |
| July | 27°C / 20°C | 31°C / 24°C | 22days (353 mm) Wet | 8.5h Good | 86% Very Muggy | 7.5 Very High | Wet | View Details |
| August | 29°C / 21°C | 33°C / 24°C | 20days (218 mm) Wet | 9.6h Good | 84% Humid | 7.4 Very High | Wet | View Details |
| September best | 25°C / 18°C | 28°C / 20°C | 19days (249 mm) Wet | 8.1h Good | 84% Humid | 6.2 High | Wet | View Details |
| October best | 19°C / 11°C | 19°C / 11°C | 14days (210 mm) Wet | 7.3h Good | 80% Humid | 4.5 Moderate | Wet | View Details |
| November | 13°C / 5°C | 11°C / 2°C | 11days (121 mm) Wet | 7.5h Good | 77% Humid | 3.6 Moderate | Fair | View Details |
| December | 6°C / -1°C | 3°C / -4°C | 14days (108 mm) Wet | 7.5h Good | 75% Muggy | 2.8 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Kiso are May, June, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Kiso, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Kiso is August, with average daytime highs of 29°C (83°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Kiso is January, with average overnight lows of -5°C (24°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Kiso is July, averaging 353mm of precipitation across 22 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Kiso runs through July, August, September, June, with the heaviest rainfall in July. Based on 10-year averages for Kiso.
Kiso receives approximately 100 sunshine hours per year. The sunniest month is August with around 10 hours. Based on climate data for Kiso.
The least favorable months to visit Kiso are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider May, June, September, October instead.
The annual average UV index in Kiso is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Kiso is 78%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Kiso receives snow. Months with snowfall average 11 snow days and 29 cm (11 in) of accumulation, with about 14 frost days during winter.
Average wind speeds in Kiso are 10 km/h (6 mph). The windiest month is March with peak winds reaching 11 km/h (7 mph) (gusts up to 50 km/h / 31 mph).
Kiso averages 3 clear-sky days per month with overall cloud cover around 65%. The clearest skies occur in November.
The annual average dew point in Kiso is 9°C (48°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Kiso 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 Kiso ranges from 7°C (45°F) to 16°C (61°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 Kiso, with a climate score of 7.3/10. Consider visiting during May, June, September, October instead for better conditions.
For June in Kiso, pack Umbrella, Waterproof jacket, Waterproof shoes, Sunscreen (SPF 30+), Sunglasses. With average highs of 24°C (75°F) and 17 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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