Kōriyama climate
Kōriyama is warmest in August, with average highs of 28 °C, and coldest in January, when nights average -3.4 °C. July is the wettest month (175 mm) and February the driest (50 mm). Figures are 1991–2020 climate normals.
Across a full year Kōriyama averages 1,232 mm of rain, 70 days above 25 °C and 91 days below freezing.
Japan · population 327,692 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month August 28 °C
- Coldest month January -3.4 °C
- Driest month February 50 mm
- Wettest month July 175 mm
- Least cloud December 57 % cloud
- Hottest on record August 36 °C
- Coldest on record January -14 °C
What to expectKōriyama through the year
Kōriyama has a clear annual cycle: average daily highs run from 3.3 °C in January to 28 °C in August, a swing of 24 °C in mean temperature across the year.
Counted across a normal year, 70 days a year reach 25 °C, 17 of them reach 30 °C, 91 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in August.
Rain is strongly seasonal. July averages 175 mm against 50 mm in February — 3.5 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 3.3 °C | 60 mm | 59 % |
| February | 4.2 °C | 50 mm | 61 % |
| March | 8.4 °C | 87 mm | 62 % |
| April | 14.8 °C | 97 mm | 62 % |
| May | 20.1 °C | 100 mm | 68 % |
| June | 23.5 °C | 118 mm | 78 % |
| July | 26.7 °C | 175 mm | 80 % |
| August | 27.8 °C | 135 mm | 74 % |
| September | 23.7 °C | 155 mm | 73 % |
| October | 17.9 °C | 138 mm | 65 % |
| November | 12.1 °C | 66 mm | 58 % |
| December | 6.3 °C | 51 mm | 57 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 3.3 °C | -3.4 °C | -0.3 °C | 13.0 °C | -13.9 °C | 0 | 0 | 28 |
| February | 4.2 °C | -3.1 °C | 0.2 °C | 16.8 °C | -11.8 °C | 0 | 0 | 24 |
| March | 8.4 °C | -0.1 °C | 3.7 °C | 21.5 °C | -12.1 °C | 0 | 0 | 17 |
| April | 14.8 °C | 5.2 °C | 9.6 °C | 27.4 °C | -8.7 °C | 0 | 0 | 2 |
| May | 20.1 °C | 10.6 °C | 15.0 °C | 32.2 °C | 2.1 °C | 3 | 0 | 0 |
| June | 23.5 °C | 15.4 °C | 19.1 °C | 34.1 °C | 7.1 °C | 10 | 0 | 0 |
| July | 26.7 °C | 19.6 °C | 22.7 °C | 34.2 °C | 10.6 °C | 22 | 6 | 0 |
| August | 27.8 °C | 20.7 °C | 23.8 °C | 36.0 °C | 12.5 °C | 24 | 9 | 0 |
| September | 23.7 °C | 16.9 °C | 19.9 °C | 32.7 °C | 7.5 °C | 11 | 1 | 0 |
| October | 17.9 °C | 10.8 °C | 13.9 °C | 26.9 °C | 2.4 °C | 0 | 0 | 0 |
| November | 12.1 °C | 4.6 °C | 7.8 °C | 22.5 °C | -5.0 °C | 0 | 0 | 2 |
| December | 6.3 °C | -0.4 °C | 2.5 °C | 17.5 °C | -10.1 °C | 0 | 0 | 19 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 60 mm | 9 | 9.9 h/day | 59 % | 76 % | 20 km/h |
| February | 50 mm | 9 | 11 h/day | 61 % | 74 % | 21 km/h |
| March | 87 mm | 11 | 12 h/day | 62 % | 73 % | 20 km/h |
| April | 97 mm | 11 | 13 h/day | 62 % | 72 % | 19 km/h |
| May | 100 mm | 12 | 14 h/day | 68 % | 75 % | 16 km/h |
| June | 118 mm | 14 | 15 h/day | 78 % | 81 % | 13 km/h |
| July | 175 mm | 17 | 15 h/day | 80 % | 85 % | 12 km/h |
| August | 135 mm | 15 | 14 h/day | 74 % | 84 % | 12 km/h |
| September | 155 mm | 13 | 12 h/day | 73 % | 84 % | 13 km/h |
| October | 138 mm | 10 | 11 h/day | 65 % | 81 % | 15 km/h |
| November | 66 mm | 8 | 10 h/day | 58 % | 80 % | 17 km/h |
| December | 51 mm | 9 | 9.6 h/day | 57 % | 77 % | 19 km/h |
How Kōriyama compares
The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.
| Destination | Summer high | Winter low | Rain per year | Days above 25 °C |
|---|---|---|---|---|
| Kōriyama | 28 °C | -3.4 °C | 1,232 mm | 70 |
| Fukushima · Japan | 28 °C | -3.6 °C | 1,358 mm | 74 |
| Iwaki · Japan | 28 °C | 1.1 °C | 1,522 mm | 65 |
| Hitachi · Japan | 27 °C | 1.6 °C | 1,531 mm | 59 |
| Yamagata · Japan | 27 °C | -5.5 °C | 1,438 mm | 58 |
| Utsunomiya · Japan | 28 °C | -2.5 °C | 1,399 mm | 80 |
Planning a trip? See the best time to visit Kōriyama.
QuestionsCommon questions about Kōriyama’s climate
When is the best time to visit Kōriyama?
That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, September sit closest to 20 °C on average, August is the warmest month and February the driest. The month-by-month table above has the full picture.
How hot does Kōriyama get?
In August, the warmest month, daily highs average 28 °C. About 17 days a year pass 30 °C. The highest value in the 1991–2020 record is 36 °C.
How cold does it get in winter?
Nights average -3.4 °C in January, the coldest month. A normal year has 91 nights below freezing.
Which month is wettest in Kōriyama?
July, averaging 175 mm over 17 days with rain. The driest month is February with 50 mm. The year as a whole averages 1,232 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Kōriyama rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.