Nihommatsu, Japan experiences average highs of 17°C (63°F) and lows of 9°C (48°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Average highs have warmed by 0.7°C (1.3°F) across the available records.
Nihommatsu, Japan Weather & Climate 2026
Monthly climate averages for Nihommatsu, 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
5/10
Best: May, June, September
UV Index
5
Low
Temperature 17°C / 9°C
Feels Like 16°C / 8°C
Rainy Days 12
Rainfall 101 mm
Sunshine 8 h
Humidity 80%
Wind Speed 16 km/h
Dew Point 9°C
Snow Days 8 days
Frost Days 14 days
Hottest Month
29°C
August
Avg Low 22°C
Rain 16 days
Coldest Month
-3°C
January
Avg High 4°C
Rain 10 days
Driest Month
8 days
February
Avg High 5°C
Avg Low -2°C
Windiest Month
21 km/h
February (Gusts 55)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures.
Sun Position
Sunrise 04:16
Daylight 14.7h
Sunset 19:01
Live conditions —
Nihommatsu on the map · live conditions
Nihommatsu, Japan
- Continent
- Asia
- Country
- Japan
- City
- Nihommatsu
- Population
- 53.6K
- Coordinates
- 37.58°, 140.43°
Seasonal Breakdown
Spring
Mar–May
Avg High 16°C
Avg Low 6°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 27°C
Avg Low 20°C
Rain 15 days/mo
1/3 best months
Autumn
Sep–Nov
Avg High 19°C
Avg Low 12°C
Rain 11 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 5°C
Avg Low -2°C
Rain 9 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: 4°C / -3°C . Feb: 5°C / -2°C . Mar: 10°C / 2°C . Apr: 16°C / 6°C . May: 21°C / 11°C . Jun: 24°C / 16°C . Jul: 28°C / 21°C . Aug: 29°C / 22°C . Sep: 25°C / 19°C . Oct: 19°C / 12°C . Nov: 13°C / 5°C . Dec: 7°C / 0°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 52 mm. Feb: 44 mm. Mar: 91 mm. Apr: 95 mm. May: 107 mm. Jun: 125 mm. Jul: 152 mm. Aug: 152 mm. Sep: 152 mm. Oct: 138 mm. Nov: 52 mm. Dec: 49 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 78%. Feb: 75%. Mar: 74%. Apr: 74%. May: 76%. Jun: 81%. Jul: 85%. Aug: 85%. Sep: 85%. Oct: 82%. Nov: 81%. Dec: 80%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 21 km/h . Mar: 19 km/h . Apr: 19 km/h . May: 16 km/h . Jun: 14 km/h . Jul: 12 km/h . Aug: 12 km/h . Sep: 13 km/h . Oct: 14 km/h . Nov: 16 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 8h. Feb: 9h. Mar: 8h. Apr: 9h. May: 9h. Jun: 9h. Jul: 8h. Aug: 9h. Sep: 7h. Oct: 7h. Nov: 8h. Dec: 7h.
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 5. Oct: UV 4. Nov: UV 3. Dec: UV 3.
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: 15 days. Feb: 12 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: 1 days. Dec: 11 days.
Climate Trends
Average highs have warmed by 0.7°C (1.3°F) across the available records. Average rainfall is trending drier by about 20 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 31°C | Aug · 29°C |
| Coldest month | Feb 2025 · -3°C | Jan · -3°C |
| Wettest month | Oct 2025 · 173 mm | Jul · 152 mm |
| Windiest month | Feb 2025 · 22 km/h | Feb · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May best
Excellent June best
Excellent July
Fair August
Fair September best
Excellent October
Good November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -3°C | -1°C / -7°C | 10days (52 mm) Wet | 7.7h Good | 78% Humid | 3 Moderate | Poor | View Details |
| February | 5°C / -2°C | 0°C / -7°C | 8days (44 mm) Wet | 8.5h Good | 75% Muggy | 4 Moderate | Poor | View Details |
| March | 10°C / 2°C | 7°C / -2°C | 11days (91 mm) Wet | 8.4h Good | 74% Muggy | 4.9 Moderate | Poor | View Details |
| April | 16°C / 6°C | 14°C / 4°C | 11days (95 mm) Wet | 9h Good | 74% Muggy | 5.8 High | Fair | View Details |
| May best | 21°C / 11°C | 21°C / 10°C | 12days (107 mm) Wet | 8.9h Good | 76% Humid | 6 High | Excellent | View Details |
| June best | 24°C / 16°C | 26°C / 17°C | 13days (125 mm) Wet | 8.6h Good | 81% Humid | 6.4 High | Excellent | View Details |
| July | 28°C / 21°C | 32°C / 24°C | 17days (152 mm) Wet | 8.1h Good | 85% Humid | 7 High | Fair | View Details |
| August | 29°C / 22°C | 34°C / 26°C | 16days (152 mm) Wet | 8.8h Good | 85% Humid | 6.9 High | Fair | View Details |
| September best | 25°C / 19°C | 27°C / 21°C | 14days (152 mm) Wet | 7h Good | 85% Humid | 5.3 High | Excellent | View Details |
| October | 19°C / 12°C | 18°C / 11°C | 11days (138 mm) Wet | 6.6h Fair | 82% Humid | 4 Moderate | Good | View Details |
| November | 13°C / 5°C | 10°C / 3°C | 8days (52 mm) Wet | 7.5h Good | 81% Humid | 3.2 Moderate | Fair | View Details |
| December | 7°C / 0°C | 3°C / -4°C | 10days (49 mm) Wet | 7.4h Good | 80% Humid | 2.7 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Nihommatsu are May, June, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Nihommatsu, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Nihommatsu is August, with average daytime highs of 29°C (84°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Nihommatsu is January, with average overnight lows of -3°C (27°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Nihommatsu is July, averaging 152mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Nihommatsu runs through July, August, September, June, with the heaviest rainfall in July. Based on 10-year averages for Nihommatsu.
Nihommatsu receives approximately 97 sunshine hours per year. The sunniest month is April with around 9 hours. Based on climate data for Nihommatsu.
The least favorable months to visit Nihommatsu are January, February, March, December, primarily due to very cold temperatures. For the best conditions, consider May, June, September instead.
The annual average UV index in Nihommatsu is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Nihommatsu is 80%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Nihommatsu receives snow. Months with snowfall average 8 snow days and 13 cm (5 in) of accumulation, with about 14 frost days during winter.
Average wind speeds in Nihommatsu are 16 km/h (10 mph). The windiest month is February with peak winds reaching 21 km/h (13 mph) (gusts up to 55 km/h / 34 mph).
Nihommatsu averages 1 clear-sky days per month with overall cloud cover around 66%. The clearest skies occur in May.
The annual average dew point in Nihommatsu is 9°C (48°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Nihommatsu 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 Nihommatsu ranges from 8°C (46°F) to 16°C (61°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 Nihommatsu. It earns a climate score of 8.2/10 with Excellent.
For June in Nihommatsu, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 24°C (76°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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