Climate averages 1991–2020
Niiza weather
in June.
A warm, wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a warm month in Niiza: daytime highs average 24.8°C and nights cool to about 17.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 177 mm of rain on roughly 15 days, which makes June a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 33 min on an average June day.
The nearest other city in this atlas is Tokorozawa (8 km away). In June its highs average 24.0°C, 0.7°C cooler than Niiza, with 177 mm of rain.
Among the 303 cities listed in Japan, Niiza ranks joint 145th of 303 for the warmest June highs and joint 109th of 303 for the driest June (rainfall, lowest first). The mean June high of those 303 cities is 24.4°C; Niiza is 0.4°C warmer than that mean.
From June to July, average highs rise by 3.7°C to 28.5°C, and monthly rainfall rises from 177 mm to 182 mm.
The annual picture
June in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Niiza climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.9°C-1.6°C | -1.6°C | 69 | 7.5 | 10.010 h |
| February | 8.9°C-0.9°C | -0.9°C | 66 | 8.5 | 10.911 h |
| March | 12.4°C2.7°C | 2.7°C | 120 | 13.2 | 11.912 h |
| April | 17.5°C7.9°C | 7.9°C | 123 | 12.8 | 13.113 h |
| May | 22.0°C13.4°C | 13.4°C | 139 | 13.1 | 14.014 h |
| June, selected | 24.8°C17.7°C | 17.7°C | 177 | 15.4 | 14.515 h |
| July | 28.5°C21.8°C | 21.8°C | 182 | 16.4 | 14.314 h |
| August | 29.9°C23.2°C | 23.2°C | 142 | 15.4 | 13.514 h |
| September | 26.0°C19.6°C | 19.6°C | 204 | 14.9 | 12.412 h |
| October | 20.5°C13.5°C | 13.5°C | 215 | 13.7 | 11.311 h |
| November | 15.3°C7.2°C | 7.2°C | 92 | 10.2 | 10.310 h |
| December | 10.3°C1.4°C | 1.4°C | 61 | 7.4 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
June in nearby cities
- Tokorozawa in JuneJapan · 8 kmHigh 24.0°C · Low 17.0°C · 177 mm rain
- Yono in JuneJapan · 10 kmHigh 24.9°C · Low 17.5°C · 152 mm rain
- Kawagoe in JuneJapan · 12 kmHigh 24.5°C · Low 17.2°C · 162 mm rain
- Musashino in JuneJapan · 13 kmHigh 24.1°C · Low 17.8°C · 177 mm rain
- Saitama in JuneJapan · 13 kmHigh 25.1°C · Low 17.7°C · 152 mm rain
- Sayama in JuneJapan · 14 kmHigh 24.2°C · Low 16.9°C · 177 mm rain
- Kawaguchi in JuneJapan · 14 kmHigh 25.0°C · Low 18.0°C · 159 mm rain
- Iruma in JuneJapan · 17 kmHigh 23.8°C · Low 16.7°C · 222 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Niiza) is explained once on the Niiza year overview and on the Sources, method and limits page.
Tokorozawa, Fuchū and Hino lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.