Climate averages 1991–2020
Ōmihachiman weather
in May.
A mild, wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Ōmihachiman: daytime highs average 21.9°C and nights cool to about 12.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 148 mm of rain on roughly 12 days, which makes May a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 59 min on an average May day.
The nearest other city in this atlas is Youkaichi (9 km away). In May its highs average 21.9°C, about as warm as Ōmihachiman, with 156 mm of rain.
Among the 303 cities listed in Japan, Ōmihachiman ranks joint 148th of 303 for the warmest May highs and joint 174th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Ōmihachiman is 0.6°C warmer than that mean.
From May to June, average highs rise by 3.4°C to 25.3°C, and monthly rainfall rises from 148 mm to 186 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
Ōmihachiman climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.1°C0.0°C | 0.0°C | 81 | 13.9 | 10.110 h |
| February | 8.0°C0.0°C | 0.0°C | 78 | 13.0 | 10.911 h |
| March | 11.8°C2.6°C | 2.6°C | 116 | 13.5 | 11.912 h |
| April | 17.2°C7.4°C | 7.4°C | 123 | 11.6 | 13.113 h |
| May, selected | 21.9°C12.6°C | 12.6°C | 148 | 11.6 | 14.014 h |
| June | 25.3°C17.3°C | 17.3°C | 186 | 14.0 | 14.514 h |
| July | 28.9°C21.8°C | 21.8°C | 210 | 15.9 | 14.314 h |
| August | 30.2°C22.8°C | 22.8°C | 122 | 12.3 | 13.513 h |
| September | 26.2°C19.1°C | 19.1°C | 179 | 12.3 | 12.412 h |
| October | 20.5°C13.2°C | 13.2°C | 152 | 10.8 | 11.311 h |
| November | 15.1°C7.5°C | 7.5°C | 81 | 9.0 | 10.410 h |
| December | 9.6°C2.4°C | 2.4°C | 75 | 11.6 | 9.810 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
- Youkaichi in MayJapan · 9 kmHigh 21.9°C · Low 12.7°C · 156 mm rain
- Moriyama in MayJapan · 12 kmHigh 22.1°C · Low 12.7°C · 138 mm rain
- Kusatsu in MayJapan · 17 kmHigh 22.4°C · Low 12.9°C · 138 mm rain
- Kōka in MayJapan · 17 kmHigh 22.0°C · Low 12.7°C · 156 mm rain
- Hikone in MayJapan · 19 kmHigh 21.0°C · Low 12.7°C · 170 mm rain
- Ōtsu in MayJapan · 25 kmHigh 22.1°C · Low 12.5°C · 153 mm rain
- Nagahama in MayJapan · 32 kmHigh 21.3°C · Low 12.7°C · 181 mm rain
- Kyoto in MayJapan · 33 kmHigh 22.6°C · Low 12.9°C · 153 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 Ōmihachiman) is explained once on the Ōmihachiman year overview and on the Sources, method and limits page.