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Shinjuku Weather by Month
Average temperatures, rainfall and humidity for Shinjuku, Japan, month by month, built from OpenWeather's historical records. Use it to see what a typical Shinjuku month looks like before you travel — then check the live Shinjuku forecast for the days ahead.
Warmest month
August
32°C average high
Coolest month
January
2°C average low
Wettest month
June
161 mm of rain
Driest month
January
36 mm of rain
Average temperature and rainfall in Shinjuku by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 10°C | 2°C | -4°C / 18°C | 36 mm | 57% | 16 km/h |
| February | 11°C | 3°C | -4°C / 22°C | 50 mm | 59% | 18 km/h |
| March | 15°C | 7°C | -2°C / 27°C | 93 mm | 64% | 18 km/h |
| April | 19°C | 12°C | 2°C / 28°C | 117 mm | 67% | 19 km/h |
| May | 24°C | 16°C | 8°C / 33°C | 108 mm | 71% | 18 km/h |
| June | 26°C | 20°C | 13°C / 37°C | 161 mm | 75% | 15 km/h |
| July | 31°C | 24°C | 18°C / 38°C | 120 mm | 76% | 15 km/h |
| August | 32°C | 25°C | 18°C / 39°C | 115 mm | 73% | 16 km/h |
| September | 28°C | 22°C | 14°C / 36°C | 132 mm | 77% | 16 km/h |
| October | 22°C | 16°C | 6°C / 32°C | 136 mm | 73% | 16 km/h |
| November | 17°C | 10°C | -1°C / 26°C | 74 mm | 65% | 14 km/h |
| December | 12°C | 5°C | -2°C / 23°C | 40 mm | 57% | 14 km/h |
Best time to visit Shinjuku
The most comfortable time to visit Shinjuku is generally May to June and October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 1183 mm a year.
Travellers who prefer heat should aim for August, when highs average 32°C. June is the month to avoid if rain would spoil your plans — it averages 161 mm, roughly 4× the rainfall of January.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Shinjuku forecast for what is happening now.