Climate averages 1991–2020
Okayama 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 Okayama: daytime highs average 22.9°C and nights cool to about 14.1°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 57 min on an average May day.
The nearest other city in this atlas is Kurashiki (17 km away). In May its highs average 22.5°C, about as warm as Okayama, with 132 mm of rain.
Among the 303 cities listed in Japan, Okayama ranks joint 35th 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; Okayama is 1.5°C warmer than that mean.
From May to June, average highs rise by 3.1°C to 25.9°C, and monthly rainfall rises from 124 mm to 172 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
Okayama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.8°C1.1°C | 1.1°C | 40 | 5.5 | 10.110 h |
| February | 9.8°C1.3°C | 1.3°C | 49 | 6.5 | 10.911 h |
| March | 13.3°C4.0°C | 4.0°C | 92 | 9.3 | 11.912 h |
| April | 18.4°C9.0°C | 9.0°C | 108 | 9.7 | 13.013 h |
| May, selected | 22.9°C14.1°C | 14.1°C | 124 | 9.9 | 14.014 h |
| June | 25.9°C18.6°C | 18.6°C | 172 | 12.2 | 14.414 h |
| July | 29.6°C23.0°C | 23.0°C | 187 | 13.5 | 14.214 h |
| August | 31.0°C24.2°C | 24.2°C | 108 | 10.3 | 13.513 h |
| September | 27.2°C20.2°C | 20.2°C | 167 | 10.8 | 12.412 h |
| October | 21.8°C13.8°C | 13.8°C | 114 | 7.7 | 11.311 h |
| November | 16.3°C8.0°C | 8.0°C | 57 | 6.1 | 10.410 h |
| December | 11.0°C3.1°C | 3.1°C | 46 | 5.3 | 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
- Kurashiki in MayJapan · 17 kmHigh 22.5°C · Low 14.5°C · 132 mm rain
- Takamatsu in MayJapan · 37 kmHigh 21.3°C · Low 14.9°C · 133 mm rain
- Marugame in MayJapan · 43 kmHigh 21.3°C · Low 14.9°C · 130 mm rain
- Tsuyama in MayJapan · 45 kmHigh 22.9°C · Low 12.8°C · 144 mm rain
- Fukuyama in MayJapan · 55 kmHigh 22.9°C · Low 14.0°C · 124 mm rain
- Tatsuno in MayJapan · 59 kmHigh 20.5°C · Low 13.9°C · 146 mm rain
- Onomichi in MayJapan · 72 kmHigh 22.4°C · Low 13.8°C · 124 mm rain
- Himeji in MayJapan · 72 kmHigh 20.8°C · Low 13.8°C · 145 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 Okayama) is explained once on the Okayama year overview and on the Sources, method and limits page.