Sandachō, Japan experiences average highs of 19°C (66°F) and lows of 12°C (54°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Average highs have stayed broadly stable across the available records.
Sandachō, Japan Weather & Climate 2026
Monthly climate averages for Sandachō, 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
5.7/10
Best: May, June, September, October, November
UV Index
5
Low
Temperature 19°C / 12°C
Feels Like 19°C / 12°C
Rainy Days 11
Rainfall 137 mm
Sunshine 8 h
Humidity 78%
Wind Speed 15 km/h
Dew Point 12°C
Snow Days 3 days
Frost Days 8 days
Hottest Month
31°C
August
Avg Low24°C
Rain15days
Coldest Month
1°C
January
Avg High8°C
Rain7days
Driest Month
6days
December
Avg High10°C
Avg Low3°C
Windiest Month
17 km/h
March (Gusts 45)
Sea Temperature
9°C – 29°C
Warmest water: August (
29.4°C
)
Worst Time to Visit
Consider avoiding January, February, August due to frequent rain.
Sun Position
Sunrise 04:46
Daylight 14.5h
Sunset 19:15
Live conditions—
Sandachō on the map · live conditions
Sandachō, Japan
- Continent
- Asia
- Country
- Japan
- City
- Sandachō
- Population
- 132.9K
- Coordinates
- 34.88°, 135.23°
Seasonal Breakdown
Spring
Mar–May
Avg High 18°C
Avg Low 9°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 28°C
Avg Low 22°C
Rain 15 days/mo
1/3 best months
Autumn
Sep–Nov
Avg High 21°C
Avg Low 15°C
Rain 11 days/mo
3/3 best months
Winter
Dec–Feb
Avg High 9°C
Avg Low 2°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: 8°C / 1°C . Feb: 9°C / 1°C . Mar: 13°C / 5°C . Apr: 18°C / 9°C . May: 22°C / 14°C . Jun: 25°C / 19°C . Jul: 29°C / 24°C . Aug: 31°C / 24°C . Sep: 27°C / 21°C . Oct: 21°C / 15°C . Nov: 16°C / 8°C . Dec: 10°C / 3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 49 mm. Feb: 62 mm. Mar: 105 mm. Apr: 142 mm. May: 159 mm. Jun: 203 mm. Jul: 251 mm. Aug: 196 mm. Sep: 197 mm. Oct: 174 mm. Nov: 61 mm. Dec: 47 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 74%. Feb: 73%. Mar: 73%. Apr: 74%. May: 76%. Jun: 81%. Jul: 85%. Aug: 81%. Sep: 82%. Oct: 78%. Nov: 77%. Dec: 76%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 17 km/h . Feb: 17 km/h . Mar: 17 km/h . Apr: 17 km/h . May: 15 km/h . Jun: 14 km/h . Jul: 14 km/h . Aug: 14 km/h . Sep: 14 km/h . Oct: 15 km/h . Nov: 14 km/h . Dec: 16 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 8h. Mar: 8h. Apr: 9h. May: 9h. Jun: 9h. Jul: 9h. Aug: 10h. Sep: 8h. Oct: 8h. Nov: 8h. Dec: 7h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 10°C . Feb: 9°C . Mar: 11°C . Apr: 15°C . May: 19°C . Jun: 23°C . Jul: 28°C . Aug: 29°C . Sep: 29°C . Oct: 24°C . Nov: 18°C . Dec: 13°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 7. 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: 5 days. Feb: 4 days. Mar: 1 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: 2 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 40 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 31°C | Aug · 31°C |
| Coldest month | Feb 2025 · 0°C | Jan · 1°C |
| Wettest month | Oct 2025 · 215 mm | Jul · 251 mm |
| Windiest month | Mar 2025 · 19 km/h | Mar · 17 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May best
Excellent June best
Excellent July
Wet August
Wet September best
Wet October best
Good November best
Good December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 1°C | 4°C / -3°C | 7days (49 mm) Good | 7.6h Good | 74% Muggy | 3.2 Moderate | Poor | View Details |
| February | 9°C / 1°C | 5°C / -2°C | 9days (62 mm) Wet | 7.9h Good | 73% Muggy | 3.9 Moderate | Poor | View Details |
| March | 13°C / 5°C | 10°C / 2°C | 11days (105 mm) Wet | 8.4h Good | 73% Muggy | 4.8 Moderate | Fair | View Details |
| April | 18°C / 9°C | 17°C / 8°C | 11days (142 mm) Wet | 8.9h Good | 74% Muggy | 5.9 High | Good | View Details |
| May best | 22°C / 14°C | 23°C / 14°C | 10days (159 mm) Wet | 9.2h Good | 76% Humid | 6.1 High | Excellent | View Details |
| June best | 25°C / 19°C | 28°C / 21°C | 14days (203 mm) Wet | 8.7h Good | 81% Humid | 6.3 High | Excellent | View Details |
| July | 29°C / 24°C | 34°C / 28°C | 17days (251 mm) Wet | 9.3h Good | 85% Humid | 7.4 Very High | Wet | View Details |
| August | 31°C / 24°C | 36°C / 29°C | 15days (196 mm) Wet | 10.3h Excellent | 81% Humid | 7.2 Very High | Wet | View Details |
| September best | 27°C / 21°C | 30°C / 24°C | 14days (197 mm) Wet | 8.3h Good | 82% Humid | 6.1 High | Wet | View Details |
| October best | 21°C / 15°C | 21°C / 14°C | 11days (174 mm) Wet | 7.6h Good | 78% Humid | 4.6 Moderate | Good | View Details |
| November best | 16°C / 8°C | 14°C / 7°C | 7days (61 mm) Good | 7.8h Good | 77% Humid | 3.6 Moderate | Good | View Details |
| December | 10°C / 3°C | 7°C / 0°C | 6days (47 mm) Good | 7.3h Good | 76% Humid | 3 Moderate | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Sandachō are May, June, September, October, November, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Sandachō, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Sandachō is August, with average daytime highs of 31°C (87°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Sandachō is January, with average overnight lows of 1°C (33°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Sandachō is July, averaging 251mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Sandachō runs through July, August, June, September, with the heaviest rainfall in July. Based on 10-year averages for Sandachō.
Sandachō receives approximately 101 sunshine hours per year. The sunniest month is August with around 10 hours. Based on climate data for Sandachō.
The least favorable months to visit Sandachō are January, February, August, primarily due to frequent rain. For the best conditions, consider May, June, September, October, November instead.
The annual average UV index in Sandachō is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Sandachō is 78%, 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 27°C (81°F), which is warm and comfortable for swimming and water activities.
Yes, Sandachō receives snow. Months with snowfall average 3 snow days and 2 cm (1 in) of accumulation, with about 8 frost days during winter.
Average wind speeds in Sandachō are 15 km/h (9 mph). The windiest month is March with peak winds reaching 17 km/h (11 mph) (gusts up to 45 km/h / 28 mph).
Sandachō averages 3 clear-sky days per month with overall cloud cover around 61%. The clearest skies occur in November.
The annual average dew point in Sandachō is 12°C (54°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Sandachō 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 Sandachō ranges from 12°C (54°F) to 19°C (66°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 Sandachō. It earns a climate score of 8.3/10 with Excellent.
For June in Sandachō, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 25°C (78°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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