Climate averages 1991–2020
Ishioka 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 Ishioka: daytime highs average 21.8°C and nights cool to about 13.5°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 140 mm of rain on roughly 13 days, which makes May a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 04 min on an average May day.
The nearest other city in this atlas is Tsuchiura (11 km away). In May its highs average 22.2°C, about as warm as Ishioka, with 129 mm of rain.
Among the 303 cities listed in Japan, Ishioka ranks joint 157th of 303 for the warmest May highs and 145th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Ishioka is 0.4°C warmer than that mean.
From May to June, average highs rise by 2.6°C to 24.4°C, and monthly rainfall rises from 140 mm to 152 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
Ishioka climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.9°C-0.1°C | -0.1°C | 61 | 6.7 | 10.010 h |
| February | 8.9°C0.4°C | 0.4°C | 62 | 7.4 | 10.811 h |
| March | 12.3°C3.4°C | 3.4°C | 110 | 12.4 | 11.912 h |
| April | 17.4°C8.4°C | 8.4°C | 114 | 11.9 | 13.113 h |
| May, selected | 21.8°C13.5°C | 13.5°C | 140 | 12.5 | 14.114 h |
| June | 24.4°C17.6°C | 17.6°C | 152 | 14.9 | 14.615 h |
| July | 28.1°C21.6°C | 21.6°C | 171 | 16.1 | 14.414 h |
| August | 29.5°C23.1°C | 23.1°C | 127 | 13.6 | 13.514 h |
| September | 25.8°C20.0°C | 20.0°C | 174 | 14.5 | 12.412 h |
| October | 20.5°C14.4°C | 14.4°C | 191 | 12.4 | 11.311 h |
| November | 15.5°C8.2°C | 8.2°C | 91 | 9.5 | 10.310 h |
| December | 10.3°C2.5°C | 2.5°C | 60 | 7.4 | 9.710 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
- Tsuchiura in MayJapan · 11 kmHigh 22.2°C · Low 13.6°C · 129 mm rain
- Tsukuba in MayJapan · 17 kmHigh 22.3°C · Low 13.3°C · 131 mm rain
- Kasama, Japan in MayJapan · 22 kmHigh 20.6°C · Low 11.8°C · 142 mm rain
- Mito in MayJapan · 25 kmHigh 20.7°C · Low 12.7°C · 148 mm rain
- Ushiku in MayJapan · 27 kmHigh 22.2°C · Low 13.5°C · 129 mm rain
- Chikusei in MayJapan · 29 kmHigh 22.4°C · Low 12.7°C · 134 mm rain
- Ryūgasaki in MayJapan · 32 kmHigh 22.3°C · Low 13.7°C · 129 mm rain
- Hitachi-Naka in MayJapan · 34 kmHigh 19.8°C · Low 13.0°C · 144 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 Ishioka) is explained once on the Ishioka year overview and on the Sources, method and limits page.