Climate averages 1991–2020
Onomichi weather
in April.
A mild, wet month: the 7th warmest and the joint 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Onomichi: daytime highs average 17.9°C and nights cool to about 8.9°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 107 mm of rain on roughly 10 days, which makes April a wet month (the joint 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 01 min on an average April day.
The nearest other city in this atlas is Mihara (11 km away). In April its highs average 18.4°C, about as warm as Onomichi, with 110 mm of rain.
Among the 303 cities listed in Japan, Onomichi ranks joint 82nd of 303 for the warmest April highs and joint 51st of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Onomichi is 1.2°C warmer than that mean.
From April to May, average highs rise by 4.4°C to 22.4°C, and monthly rainfall rises from 107 mm to 124 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Mihara in AprilJapan · 11 kmHigh 18.4°C · Low 8.9°C · 110 mm rain
- Fukuyama in AprilJapan · 17 kmHigh 18.5°C · Low 9.2°C · 107 mm rain
- Higashihiroshima in AprilJapan · 42 kmHigh 17.3°C · Low 8.1°C · 117 mm rain
- Imabari in AprilJapan · 43 kmHigh 17.5°C · Low 11.0°C · 132 mm rain
- Niihama in AprilJapan · 52 kmHigh 18.5°C · Low 10.4°C · 134 mm rain
- Kurashiki in AprilJapan · 55 kmHigh 18.2°C · Low 9.7°C · 115 mm rain
- Marugame in AprilJapan · 56 kmHigh 17.0°C · Low 10.2°C · 110 mm rain
- Saijō in AprilJapan · 56 kmHigh 19.3°C · Low 10.6°C · 134 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.