Climate averages 1991–2020
Onomichi weather
in July.
A hot, very wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Onomichi: daytime highs average 28.8°C and nights cool to about 22.8°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 189 mm of rain on roughly 14 days, which makes July a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 13 min on an average July day.
The nearest other city in this atlas is Mihara (11 km away). In July its highs average 29.3°C, about as warm as Onomichi, with 207 mm of rain.
Among the 303 cities listed in Japan, Onomichi ranks joint 92nd of 303 for the warmest July highs and joint 121st of 303 for the driest July (rainfall, lowest first). The mean July high of those 303 cities is 27.9°C; Onomichi is 1.0°C warmer than that mean.
From July to August, average highs rise by 1.6°C to 30.5°C, and monthly rainfall falls from 189 mm to 107 mm.
The annual picture
July 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
Onomichi climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.5°C1.5°C | 1.5°C | 42 | 5.7 | 10.110 h |
| February | 9.6°C1.6°C | 1.6°C | 54 | 7.2 | 10.911 h |
| March | 12.9°C4.2°C | 4.2°C | 92 | 9.7 | 11.912 h |
| April | 17.9°C8.9°C | 8.9°C | 107 | 9.6 | 13.013 h |
| May | 22.4°C13.8°C | 13.8°C | 124 | 10.0 | 13.914 h |
| June | 25.3°C18.4°C | 18.4°C | 182 | 12.0 | 14.414 h |
| July, selected | 28.8°C22.8°C | 22.8°C | 189 | 13.6 | 14.214 h |
| August | 30.5°C24.0°C | 24.0°C | 107 | 10.8 | 13.413 h |
| September | 26.9°C20.3°C | 20.3°C | 145 | 10.7 | 12.412 h |
| October | 21.5°C14.3°C | 14.3°C | 105 | 7.3 | 11.311 h |
| November | 16.0°C8.6°C | 8.6°C | 55 | 6.1 | 10.410 h |
| December | 10.7°C3.8°C | 3.8°C | 47 | 5.6 | 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
July in nearby cities
- Mihara in JulyJapan · 11 kmHigh 29.3°C · Low 23.1°C · 207 mm rain
- Fukuyama in JulyJapan · 17 kmHigh 29.4°C · Low 23.1°C · 189 mm rain
- Higashihiroshima in JulyJapan · 42 kmHigh 28.1°C · Low 22.1°C · 225 mm rain
- Imabari in JulyJapan · 43 kmHigh 28.5°C · Low 24.0°C · 225 mm rain
- Niihama in JulyJapan · 52 kmHigh 29.5°C · Low 23.9°C · 228 mm rain
- Kurashiki in JulyJapan · 55 kmHigh 29.2°C · Low 23.4°C · 171 mm rain
- Marugame in JulyJapan · 56 kmHigh 28.1°C · Low 23.3°C · 176 mm rain
- Saijō in JulyJapan · 56 kmHigh 30.5°C · Low 24.4°C · 228 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 Onomichi) is explained once on the Onomichi year overview and on the Sources, method and limits page.
Fukuyama lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.