Climate averages 1991–2020
Iwaki weather
in January.
A cold, moderately wet month: the coolest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Iwaki: daytime highs average 6.9°C and nights cool to about 1.1°C. By daytime temperature it is the coolest month of the year.
Expect about 71 mm of rain on roughly 8 days, which makes January a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 56 min on an average January day.
The nearest other city in this atlas is Sukagawa (51 km away). In January its highs average 3.5°C, 3.4°C cooler than Iwaki, with 54 mm of rain.
Among the 303 cities listed in Japan, Iwaki ranks 223rd of 303 for the warmest January highs and joint 189th of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Iwaki is 0.1°C cooler than that mean.
From January to February, average highs rise by 0.5°C to 7.4°C, and monthly rainfall falls from 71 mm to 69 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Sukagawa in JanuaryJapan · 51 kmHigh 3.5°C · Low -3.5°C · 54 mm rain
- Hitachi in JanuaryJapan · 54 kmHigh 7.3°C · Low 1.3°C · 73 mm rain
- Kōriyama in JanuaryJapan · 59 kmHigh 3.2°C · Low -3.7°C · 57 mm rain
- Nasushiobara in JanuaryJapan · 73 kmHigh 4.5°C · Low -3.0°C · 62 mm rain
- Ōtawara in JanuaryJapan · 78 kmHigh 5.3°C · Low -2.9°C · 54 mm rain
- Hitachi-Naka in JanuaryJapan · 79 kmHigh 7.8°C · Low 1.3°C · 63 mm rain
- Fukushima in JanuaryJapan · 86 kmHigh 3.8°C · Low -4.3°C · 64 mm rain
- Mito in JanuaryJapan · 87 kmHigh 7.7°C · Low 0.0°C · 72 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.