Climate averages 1991–2020
Imabari weather
in August.
A hot, wet month: the warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Imabari: daytime highs average 29.7°C and nights cool to about 25.0°C. By daytime temperature it is the warmest month of the year.
Expect about 142 mm of rain on roughly 14 days, which makes August a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 25 min on an average August day.
The nearest other city in this atlas is Saijō (24 km away). In August its highs average 31.3°C, 1.6°C warmer than Imabari, with 151 mm of rain.
Among the 303 cities listed in Japan, Imabari ranks joint 136th of 303 for the warmest August highs and joint 129th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Imabari is 0.5°C warmer than that mean.
From August to September, average highs fall by 3.2°C to 26.5°C, and monthly rainfall rises from 142 mm to 196 mm.
The annual picture
August 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
Imabari climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.5°C4.1°C | 4.1°C | 66 | 11.1 | 10.210 h |
| February | 9.5°C4.1°C | 4.1°C | 80 | 10.8 | 10.911 h |
| March | 12.8°C6.6°C | 6.6°C | 118 | 12.3 | 12.012 h |
| April | 17.5°C11.0°C | 11.0°C | 132 | 11.1 | 13.013 h |
| May | 21.8°C15.6°C | 15.6°C | 156 | 11.1 | 13.914 h |
| June | 24.9°C19.8°C | 19.8°C | 249 | 14.8 | 14.414 h |
| July | 28.5°C24.0°C | 24.0°C | 225 | 15.4 | 14.214 h |
| August, selected | 29.7°C25.0°C | 25.0°C | 142 | 13.5 | 13.413 h |
| September | 26.5°C21.9°C | 21.9°C | 196 | 13.2 | 12.412 h |
| October | 21.4°C16.8°C | 16.8°C | 148 | 10.0 | 11.411 h |
| November | 16.2°C11.4°C | 11.4°C | 82 | 9.2 | 10.410 h |
| December | 11.0°C6.5°C | 6.5°C | 79 | 11.0 | 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
August in nearby cities
- Saijō in AugustJapan · 24 kmHigh 31.3°C · Low 25.2°C · 151 mm rain
- Niihama in AugustJapan · 31 kmHigh 30.6°C · Low 24.8°C · 151 mm rain
- Matsuyama in AugustJapan · 34 kmHigh 30.7°C · Low 24.9°C · 156 mm rain
- Mihara in AugustJapan · 37 kmHigh 30.9°C · Low 24.3°C · 125 mm rain
- Onomichi in AugustJapan · 43 kmHigh 30.5°C · Low 24.0°C · 107 mm rain
- Kure in AugustJapan · 44 kmHigh 28.4°C · Low 24.2°C · 120 mm rain
- Higashihiroshima in AugustJapan · 45 kmHigh 29.6°C · Low 23.1°C · 132 mm rain
- Shinagawa in AugustJapan · 48 kmHigh 29.7°C · Low 23.3°C · 194 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 Imabari) is explained once on the Imabari year overview and on the Sources, method and limits page.