Saitama climate
Saitama is warmest in August, with average highs of 30 °C, and coldest in January, when nights average -1.4 °C. October is the wettest month (195 mm) and December the driest (52 mm). Figures are 1991–2020 climate normals.
Across a full year Saitama averages 1,396 mm of rain, 100 days above 25 °C and 55 days below freezing.
Japan · population 1,324,854 · 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 -1.4 °C
- Driest month December 52 mm
- Wettest month October 195 mm
- Least cloud January 37 % cloud
- Hottest on record July 39 °C
- Coldest on record February -13 °C
What to expectSaitama through the year
Saitama has a clear annual cycle: average daily highs run from 8.1 °C in January to 30 °C in August, a swing of 23 °C in mean temperature across the year.
Counted across a normal year, 100 days a year reach 25 °C, 36 of them reach 30 °C, 55 nights drop below freezing. The warmest reading in the 1991–2020 record is 39 °C, in July.
Rain is strongly seasonal. October averages 195 mm against 52 mm in December — 3.7 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 8.1 °C | 59 mm | 37 % |
| February | 9.2 °C | 58 mm | 46 % |
| March | 12.7 °C | 99 mm | 56 % |
| April | 17.9 °C | 106 mm | 60 % |
| May | 22.5 °C | 130 mm | 69 % |
| June | 25.2 °C | 159 mm | 81 % |
| July | 28.9 °C | 157 mm | 76 % |
| August | 30.3 °C | 121 mm | 67 % |
| September | 26.4 °C | 181 mm | 69 % |
| October | 20.8 °C | 195 mm | 62 % |
| November | 15.6 °C | 79 mm | 51 % |
| December | 10.5 °C | 52 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 | 8.1 °C | -1.4 °C | 2.9 °C | 17.8 °C | -13.1 °C | 0 | 0 | 21 |
| February | 9.2 °C | -0.4 °C | 4.0 °C | 21.3 °C | -13.4 °C | 0 | 0 | 16 |
| March | 12.7 °C | 3.2 °C | 7.7 °C | 24.6 °C | -4.7 °C | 0 | 0 | 6 |
| April | 17.9 °C | 8.6 °C | 13.0 °C | 28.2 °C | -1.4 °C | 0 | 0 | 0 |
| May | 22.5 °C | 13.8 °C | 17.9 °C | 30.7 °C | 3.9 °C | 6 | 0 | 0 |
| June | 25.2 °C | 18.1 °C | 21.3 °C | 33.1 °C | 10.3 °C | 16 | 2 | 0 |
| July | 28.9 °C | 22.0 °C | 25.1 °C | 38.9 °C | 15.0 °C | 26 | 12 | 0 |
| August | 30.3 °C | 23.3 °C | 26.3 °C | 37.6 °C | 16.0 °C | 29 | 17 | 0 |
| September | 26.4 °C | 19.7 °C | 22.7 °C | 36.1 °C | 9.8 °C | 19 | 4 | 0 |
| October | 20.8 °C | 13.7 °C | 16.9 °C | 30.6 °C | 4.0 °C | 3 | 0 | 0 |
| November | 15.6 °C | 7.3 °C | 11.1 °C | 24.3 °C | -3.4 °C | 0 | 0 | 0 |
| December | 10.5 °C | 1.4 °C | 5.6 °C | 23.3 °C | -7.7 °C | 0 | 0 | 11 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 59 mm | 6 | 10.0 h/day | 37 % | 68 % | 18 km/h |
| February | 58 mm | 7 | 11 h/day | 46 % | 67 % | 19 km/h |
| March | 99 mm | 11 | 12 h/day | 56 % | 69 % | 21 km/h |
| April | 106 mm | 11 | 13 h/day | 60 % | 72 % | 22 km/h |
| May | 130 mm | 12 | 14 h/day | 69 % | 75 % | 20 km/h |
| June | 159 mm | 15 | 15 h/day | 81 % | 80 % | 17 km/h |
| July | 157 mm | 14 | 14 h/day | 76 % | 82 % | 16 km/h |
| August | 121 mm | 12 | 14 h/day | 67 % | 80 % | 16 km/h |
| September | 181 mm | 13 | 12 h/day | 69 % | 80 % | 16 km/h |
| October | 195 mm | 12 | 11 h/day | 62 % | 79 % | 15 km/h |
| November | 79 mm | 8 | 10 h/day | 51 % | 76 % | 15 km/h |
| December | 52 mm | 6 | 9.7 h/day | 39 % | 71 % | 16 km/h |
How Saitama 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 |
|---|---|---|---|---|
| Saitama | 30 °C | -1.4 °C | 1,396 mm | 100 |
| Kawaguchi · Japan | 30 °C | -1.0 °C | 1,458 mm | 100 |
| Niiza · Japan | 30 °C | -1.3 °C | 1,599 mm | 97 |
| Kawagoe · Japan | 30 °C | -2.0 °C | 1,432 mm | 95 |
| Tokorozawa · Japan | 29 °C | -2.0 °C | 1,616 mm | 88 |
Planning a trip? See the best time to visit Saitama.
QuestionsCommon questions about Saitama’s climate
When is the best time to visit Saitama?
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 Saitama get?
In August, the warmest month, daily highs average 30 °C. About 36 days a year pass 30 °C. The highest value in the 1991–2020 record is 39 °C.
How cold does it get in winter?
Nights average -1.4 °C in January, the coldest month. A normal year has 55 nights below freezing.
Which month is wettest in Saitama?
October, averaging 195 mm over 12 days with rain. The driest month is December with 52 mm. The year as a whole averages 1,396 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 Saitama 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.