Climate averages 1991–2020
Iwaki 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 Iwaki: daytime highs average 19.8°C and nights cool to about 12.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 145 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 14 h 08 min on an average May day.
The nearest other city in this atlas is Sukagawa (51 km away). In May its highs average 20.1°C, about as warm as Iwaki, with 115 mm of rain.
Among the 303 cities listed in Japan, Iwaki ranks joint 261st of 303 for the warmest May highs and joint 163rd of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Iwaki is 1.6°C cooler than that mean.
From May to June, average highs rise by 2.9°C to 22.6°C, and monthly rainfall rises from 145 mm to 146 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
Iwaki climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.9°C1.1°C | 1.1°C | 71 | 7.9 | 9.910 h |
| February | 7.4°C0.8°C | 0.8°C | 69 | 8.0 | 10.811 h |
| March | 10.7°C3.1°C | 3.1°C | 125 | 12.1 | 11.912 h |
| April | 15.5°C7.7°C | 7.7°C | 134 | 11.9 | 13.113 h |
| May, selected | 19.8°C12.6°C | 12.6°C | 145 | 12.0 | 14.114 h |
| June | 22.6°C16.8°C | 16.8°C | 146 | 13.7 | 14.715 h |
| July | 26.0°C20.7°C | 20.7°C | 175 | 14.5 | 14.414 h |
| August | 27.5°C22.3°C | 22.3°C | 126 | 11.8 | 13.614 h |
| September | 24.5°C19.4°C | 19.4°C | 192 | 14.1 | 12.512 h |
| October | 19.6°C14.1°C | 14.1°C | 223 | 13.4 | 11.311 h |
| November | 14.6°C8.3°C | 8.3°C | 111 | 9.8 | 10.210 h |
| December | 9.4°C3.5°C | 3.5°C | 73 | 8.6 | 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
- Sukagawa in MayJapan · 51 kmHigh 20.1°C · Low 10.1°C · 115 mm rain
- Hitachi in MayJapan · 54 kmHigh 20.0°C · Low 12.9°C · 144 mm rain
- Kōriyama in MayJapan · 59 kmHigh 20.1°C · Low 10.1°C · 97 mm rain
- Nasushiobara in MayJapan · 73 kmHigh 20.3°C · Low 10.3°C · 148 mm rain
- Ōtawara in MayJapan · 78 kmHigh 20.6°C · Low 10.3°C · 142 mm rain
- Hitachi-Naka in MayJapan · 79 kmHigh 19.8°C · Low 13.0°C · 144 mm rain
- Fukushima in MayJapan · 86 kmHigh 20.6°C · Low 10.0°C · 106 mm rain
- Mito in MayJapan · 87 kmHigh 20.7°C · Low 12.7°C · 148 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 Iwaki) is explained once on the Iwaki year overview and on the Sources, method and limits page.