Climate averages 1991–2020
Onomichi weather
in May.
A warm, wet month: the 5th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Onomichi: daytime highs average 22.4°C and nights cool to about 13.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 124 mm of rain on roughly 10 days, which makes May a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 56 min on an average May day.
The nearest other city in this atlas is Mihara (11 km away). In May its highs average 22.9°C, 0.5°C warmer than Onomichi, with 129 mm of rain.
Among the 303 cities listed in Japan, Onomichi ranks joint 78th of 303 for the warmest May highs and joint 47th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Onomichi is 1.0°C warmer than that mean.
From May to June, average highs rise by 2.9°C to 25.3°C, and monthly rainfall rises from 124 mm to 182 mm.
The annual picture
May 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, selected | 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
May in nearby cities
- Mihara in MayJapan · 11 kmHigh 22.9°C · Low 13.9°C · 129 mm rain
- Fukuyama in MayJapan · 17 kmHigh 22.9°C · Low 14.0°C · 124 mm rain
- Higashihiroshima in MayJapan · 42 kmHigh 21.7°C · Low 13.0°C · 134 mm rain
- Imabari in MayJapan · 43 kmHigh 21.8°C · Low 15.6°C · 156 mm rain
- Niihama in MayJapan · 52 kmHigh 22.8°C · Low 15.1°C · 158 mm rain
- Kurashiki in MayJapan · 55 kmHigh 22.5°C · Low 14.5°C · 132 mm rain
- Marugame in MayJapan · 56 kmHigh 21.3°C · Low 14.9°C · 130 mm rain
- Saijō in MayJapan · 56 kmHigh 23.8°C · Low 15.6°C · 158 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.