Climate averages 1991–2020
Iwaki weather
in April.
A mild, wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Iwaki: daytime highs average 15.5°C and nights cool to about 7.7°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 134 mm of rain on roughly 12 days, which makes April a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 07 min on an average April day.
The nearest other city in this atlas is Sukagawa (51 km away). In April its highs average 14.9°C, 0.6°C cooler than Iwaki, with 103 mm of rain.
Among the 303 cities listed in Japan, Iwaki ranks joint 249th of 303 for the warmest April highs and joint 199th of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Iwaki is 1.2°C cooler than that mean.
From April to May, average highs rise by 4.3°C to 19.8°C, and monthly rainfall rises from 134 mm to 145 mm.
The annual picture
April 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, selected | 15.5°C7.7°C | 7.7°C | 134 | 11.9 | 13.113 h |
| May | 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
April in nearby cities
- Sukagawa in AprilJapan · 51 kmHigh 14.9°C · Low 4.5°C · 103 mm rain
- Hitachi in AprilJapan · 54 kmHigh 15.8°C · Low 7.8°C · 125 mm rain
- Kōriyama in AprilJapan · 59 kmHigh 14.9°C · Low 4.5°C · 95 mm rain
- Nasushiobara in AprilJapan · 73 kmHigh 15.3°C · Low 4.8°C · 130 mm rain
- Ōtawara in AprilJapan · 78 kmHigh 15.7°C · Low 4.9°C · 121 mm rain
- Hitachi-Naka in AprilJapan · 79 kmHigh 15.9°C · Low 8.2°C · 121 mm rain
- Fukushima in AprilJapan · 86 kmHigh 15.5°C · Low 4.2°C · 99 mm rain
- Mito in AprilJapan · 87 kmHigh 16.6°C · Low 7.7°C · 124 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.