Climate averages 1991–2020
Niihama weather
in June.
A warm, very wet month: the 4th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
June is a warm month in Niihama: daytime highs average 25.8°C and nights cool to about 19.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 249 mm of rain on roughly 15 days, which makes June a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 22 min on an average June day.
The nearest other city in this atlas is Saijō (12 km away). In June its highs average 26.8°C, 1.0°C warmer than Niihama, with 249 mm of rain.
Among the 303 cities listed in Japan, Niihama ranks joint 44th of 303 for the warmest June highs and joint 242nd of 303 for the driest June (rainfall, lowest first). The mean June high of those 303 cities is 24.4°C; Niihama is 1.5°C warmer than that mean.
From June to July, average highs rise by 3.7°C to 29.5°C, and monthly rainfall falls from 249 mm to 228 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
Niihama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.0°C3.3°C | 3.3°C | 78 | 13.5 | 10.210 h |
| February | 10.1°C3.3°C | 3.3°C | 86 | 12.3 | 10.911 h |
| March | 13.6°C5.8°C | 5.8°C | 122 | 13.4 | 12.012 h |
| April | 18.5°C10.4°C | 10.4°C | 134 | 11.6 | 13.013 h |
| May | 22.8°C15.1°C | 15.1°C | 158 | 11.2 | 13.914 h |
| June, selected | 25.8°C19.5°C | 19.5°C | 249 | 15.1 | 14.414 h |
| July | 29.5°C23.9°C | 23.9°C | 228 | 15.6 | 14.214 h |
| August | 30.6°C24.8°C | 24.8°C | 151 | 13.8 | 13.413 h |
| September | 27.1°C21.4°C | 21.4°C | 216 | 14.1 | 12.412 h |
| October | 21.9°C15.7°C | 15.7°C | 166 | 11.0 | 11.411 h |
| November | 16.6°C10.2°C | 10.2°C | 90 | 9.9 | 10.410 h |
| December | 11.4°C5.5°C | 5.5°C | 90 | 12.8 | 9.910 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
- Saijō in JuneJapan · 12 kmHigh 26.8°C · Low 20.1°C · 249 mm rain
- Shikokuchūō in JuneJapan · 23 kmHigh 26.1°C · Low 19.4°C · 268 mm rain
- Imabari in JuneJapan · 31 kmHigh 24.9°C · Low 19.8°C · 249 mm rain
- Shinagawa in JuneJapan · 45 kmHigh 25.5°C · Low 18.4°C · 297 mm rain
- Kochi in JuneJapan · 50 kmHigh 25.4°C · Low 18.7°C · 358 mm rain
- Matsuyama in JuneJapan · 52 kmHigh 26.1°C · Low 19.7°C · 268 mm rain
- Onomichi in JuneJapan · 52 kmHigh 25.3°C · Low 18.4°C · 182 mm rain
- Mihara in JuneJapan · 53 kmHigh 25.9°C · Low 18.6°C · 192 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 Niihama) is explained once on the Niihama year overview and on the Sources, method and limits page.
Saijō lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.