Ōta climate
Ōta is warmest in August, with average highs of 30 °C, and coldest in January, when nights average -1.6 °C. September is the wettest month (206 mm) and December the driest (46 mm). Figures are 1991–2020 climate normals.
Across a full year Ōta averages 1,478 mm of rain, 93 days above 25 °C and 66 days below freezing.
Japan · population 224,358 · 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 30 °C
- Coldest month January -1.6 °C
- Driest month December 46 mm
- Wettest month September 206 mm
- Least cloud December 39 % cloud
- Hottest on record July 40 °C
- Coldest on record January -15 °C
What to expectŌta through the year
Ōta has a clear annual cycle: average daily highs run from 7.2 °C in January to 30 °C in August, a swing of 23 °C in mean temperature across the year.
Counted across a normal year, 93 days a year reach 25 °C, 30 of them reach 30 °C, 66 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in July.
Rain is strongly seasonal. September averages 206 mm against 46 mm in December — 4.5 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 7.2 °C | 53 mm | 40 % |
| February | 8.2 °C | 54 mm | 46 % |
| March | 12.0 °C | 96 mm | 54 % |
| April | 17.5 °C | 109 mm | 58 % |
| May | 22.3 °C | 134 mm | 66 % |
| June | 24.9 °C | 179 mm | 79 % |
| July | 28.3 °C | 194 mm | 77 % |
| August | 29.5 °C | 155 mm | 69 % |
| September | 25.6 °C | 206 mm | 69 % |
| October | 20.0 °C | 187 mm | 60 % |
| November | 14.7 °C | 67 mm | 47 % |
| December | 9.7 °C | 46 mm | 39 % |
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 | 7.2 °C | -1.6 °C | 2.2 °C | 16.6 °C | -15.2 °C | 0 | 0 | 24 |
| February | 8.2 °C | -0.9 °C | 3.1 °C | 20.4 °C | -10.9 °C | 0 | 0 | 19 |
| March | 12.0 °C | 2.2 °C | 6.7 °C | 24.2 °C | -5.8 °C | 0 | 0 | 9 |
| April | 17.5 °C | 7.4 °C | 12.2 °C | 29.0 °C | -5.3 °C | 1 | 0 | 1 |
| May | 22.3 °C | 12.7 °C | 17.3 °C | 34.1 °C | 2.3 °C | 7 | 0 | 0 |
| June | 24.9 °C | 17.3 °C | 20.9 °C | 34.5 °C | 9.7 °C | 15 | 2 | 0 |
| July | 28.3 °C | 21.2 °C | 24.4 °C | 39.8 °C | 14.8 °C | 25 | 11 | 0 |
| August | 29.5 °C | 22.3 °C | 25.6 °C | 37.7 °C | 15.4 °C | 28 | 14 | 0 |
| September | 25.6 °C | 18.8 °C | 21.9 °C | 34.4 °C | 8.8 °C | 17 | 3 | 0 |
| October | 20.0 °C | 12.7 °C | 16.1 °C | 30.3 °C | 2.4 °C | 2 | 0 | 0 |
| November | 14.7 °C | 6.1 °C | 10.1 °C | 23.8 °C | -2.7 °C | 0 | 0 | 0 |
| December | 9.7 °C | 0.8 °C | 4.8 °C | 22.1 °C | -7.1 °C | 0 | 0 | 13 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 53 mm | 6 | 10.0 h/day | 40 % | 67 % | 16 km/h |
| February | 54 mm | 7 | 11 h/day | 46 % | 66 % | 17 km/h |
| March | 96 mm | 11 | 12 h/day | 54 % | 68 % | 17 km/h |
| April | 109 mm | 11 | 13 h/day | 58 % | 70 % | 16 km/h |
| May | 134 mm | 12 | 14 h/day | 66 % | 73 % | 14 km/h |
| June | 179 mm | 17 | 15 h/day | 79 % | 80 % | 12 km/h |
| July | 194 mm | 17 | 14 h/day | 77 % | 83 % | 10 km/h |
| August | 155 mm | 16 | 14 h/day | 69 % | 81 % | 10 km/h |
| September | 206 mm | 16 | 12 h/day | 69 % | 81 % | 11 km/h |
| October | 187 mm | 12 | 11 h/day | 60 % | 79 % | 11 km/h |
| November | 67 mm | 8 | 10 h/day | 47 % | 75 % | 12 km/h |
| December | 46 mm | 6 | 9.7 h/day | 39 % | 70 % | 14 km/h |
How Ōta 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 |
|---|---|---|---|---|
| Ōta | 30 °C | -1.6 °C | 1,478 mm | 93 |
| Isesaki · Japan | 29 °C | -1.9 °C | 1,476 mm | 83 |
| Kumagaya · Japan | 30 °C | -1.3 °C | 1,619 mm | 98 |
| Maebashi · Japan | 29 °C | -2.0 °C | 1,577 mm | 83 |
| Takasaki · Japan | 28 °C | -2.4 °C | 1,936 mm | 78 |
| Tochigi · Japan | 29 °C | -1.9 °C | 1,777 mm | 93 |
| Oyama · Japan | 30 °C | -1.8 °C | 1,576 mm | 96 |
Planning a trip? See the best time to visit Ōta.
QuestionsCommon questions about Ōta’s climate
When is the best time to visit Ōta?
That depends on what you want, so the honest answer is a comparison rather than a single month. May, June, September sit closest to 20 °C on average, August is the warmest month and December the driest. The month-by-month table above has the full picture.
How hot does Ōta get?
In August, the warmest month, daily highs average 30 °C. About 30 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.
How cold does it get in winter?
Nights average -1.6 °C in January, the coldest month. A normal year has 66 nights below freezing.
Which month is wettest in Ōta?
September, averaging 206 mm over 16 days with rain. The driest month is December with 46 mm. The year as a whole averages 1,478 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 Ōta 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
- Data point
- 36.300°, 139.367° (the coordinates the reanalysis values are taken for)
- 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.