Weather in Nagoya

Nagoya is in Japan at 35.2°N. The 2001–2020 NASA POWER daily record describes a humid subtropical climate. August is the warmest month (average 27.3°C, high 30.6°C) and January is the coolest (average 4.5°C, low 1.0°C).

Rain is wet season runs from March to November, inside an annual total of 1741 mm. The wettest month is July at 225 mm; the driest is January at 73 mm. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are May, June, and September.

Rainfall pattern

The wet season in Nagoya starts in March and ends in November (March, April, May, June, July, August, September, October, and November). July is the core of it at 225 mm. January is the other extreme, with 73 mm.

Humidity peaks near 84%. That usually lines up with the wetter months rather than the hottest ones.

Hot and cool months in Nagoya

Nagoya has a 22.8°C gap between its coolest monthly average (4.5°C in January) and its warmest (27.3°C in August). That is a northern-hemisphere pattern.

Across the year the mean afternoon high is 19.5°C. If you want the smallest day–night shock, look at months where the high and low sit close together; August nights still hold 24.0°C.

The calendar in Nagoya

The year bottoms out in January. Plan for 1.0°C at night and 8.1°C in the afternoon. The wet season opens in March. Expect 118 mm and 11 rainy days, with nights around 3.8°C. In April, Nagoya averages 18.1°C by day and 8.5°C at night, with 146 mm of rain. May: 22.6°C high, 13.7°C low, 164 mm rain, 78% humidity. June stands apart from the months beside it: 26.0°C / 18.5°C and 198 mm. July is the wettest month — 225 mm and 17 rainy days, with 84% humidity.

August is the warmest month. Afternoon highs average 30.6°C and nights settle near 24.0°C, with 161 mm of rain. September: 27.5°C high, 20.6°C low, 215 mm rain, 81% humidity. October brings 190 mm and 12 rainy days; temperatures run from 14.6°C to 22.2°C. November closes the wet season: 90 mm over 9 rainy days, then the calendar dries. December: 10.8°C high, 3.4°C low, 81 mm rain, 81% humidity.

When the score favours a visit

The three months with the highest comfort score are May, June, and September: May (18.2°C average, 164 mm, 78% humidity); June (22.3°C average, 198 mm, 81% humidity); September (24.0°C average, 215 mm, 81% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at March–November instead of the score.

Nagoya and other cities in Japan

Kyoto is about 106 km away: Nagoya is 1.4°C warmer than Kyoto in its hottest month and 84 mm wetter over the year than Kyoto. Kyoto’s wettest month is July (210 mm) versus July here.

Osaka is about 139 km away: Nagoya is 1.1°C warmer than Osaka in its hottest month and a similar annual rainfall (1753 mm in Osaka). Osaka’s wettest month is September (225 mm) versus July here.

Kobe is about 166 km away: Nagoya is about as warm as Kobe at the hot peak and 215 mm wetter over the year than Kobe. Kobe’s wettest month is July (204 mm) versus July here.