Tsukuba climate
Tsukuba is warmest in August, with average highs of 30 °C, and coldest in January, when nights average -0.9 °C. October is the wettest month (188 mm) and December the driest (56 mm). Figures are 1991–2020 climate normals.
Across a full year Tsukuba averages 1,412 mm of rain, 96 days above 25 °C and 53 days below freezing.
Japan · population 241,656 · 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 -0.9 °C
- Driest month December 56 mm
- Wettest month October 188 mm
- Least cloud January 38 % cloud
- Hottest on record August 38 °C
- Coldest on record January -11 °C
What to expectTsukuba through the year
Tsukuba has a clear annual cycle: average daily highs run from 7.9 °C in January to 30 °C in August, a swing of 23 °C in mean temperature across the year.
Counted across a normal year, 96 days a year reach 25 °C, 35 of them reach 30 °C, 53 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in August.
Rain is strongly seasonal. October averages 188 mm against 56 mm in December — 3.3 times as much. Planning around the dry months matters more here than planning around temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 7.9 °C | 61 mm | 38 % |
| February | 8.9 °C | 60 mm | 47 % |
| March | 12.5 °C | 106 mm | 57 % |
| April | 17.7 °C | 107 mm | 61 % |
| May | 22.3 °C | 132 mm | 69 % |
| June | 25.0 °C | 158 mm | 81 % |
| July | 28.6 °C | 163 mm | 76 % |
| August | 30.0 °C | 124 mm | 67 % |
| September | 26.2 °C | 175 mm | 69 % |
| October | 20.7 °C | 188 mm | 63 % |
| November | 15.5 °C | 83 mm | 52 % |
| December | 10.3 °C | 56 mm | 40 % |
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 | 7.9 °C | -0.9 °C | 3.0 °C | 17.6 °C | -11.5 °C | 0 | 0 | 21 |
| February | 8.9 °C | -0.0 °C | 4.0 °C | 20.8 °C | -7.8 °C | 0 | 0 | 16 |
| March | 12.5 °C | 3.4 °C | 7.6 °C | 24.0 °C | -4.9 °C | 0 | 0 | 6 |
| April | 17.7 °C | 8.6 °C | 12.8 °C | 27.8 °C | -0.8 °C | 0 | 0 | 0 |
| May | 22.3 °C | 13.7 °C | 17.6 °C | 31.8 °C | 4.4 °C | 6 | 0 | 0 |
| June | 25.0 °C | 17.8 °C | 21.0 °C | 33.6 °C | 10.6 °C | 15 | 2 | 0 |
| July | 28.6 °C | 21.8 °C | 24.7 °C | 37.2 °C | 13.8 °C | 25 | 12 | 0 |
| August | 30.0 °C | 23.1 °C | 26.0 °C | 38.2 °C | 16.5 °C | 29 | 16 | 0 |
| September | 26.2 °C | 19.7 °C | 22.5 °C | 36.1 °C | 9.8 °C | 18 | 4 | 0 |
| October | 20.7 °C | 13.9 °C | 16.9 °C | 30.5 °C | 5.1 °C | 2 | 0 | 0 |
| November | 15.5 °C | 7.5 °C | 11.2 °C | 23.4 °C | -4.5 °C | 0 | 0 | 0 |
| December | 10.3 °C | 1.7 °C | 5.6 °C | 23.2 °C | -6.0 °C | 0 | 0 | 10 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 61 mm | 6 | 10.0 h/day | 38 % | 70 % | 18 km/h |
| February | 60 mm | 7 | 11 h/day | 47 % | 70 % | 19 km/h |
| March | 106 mm | 12 | 12 h/day | 57 % | 72 % | 20 km/h |
| April | 107 mm | 11 | 13 h/day | 61 % | 74 % | 21 km/h |
| May | 132 mm | 12 | 14 h/day | 69 % | 77 % | 19 km/h |
| June | 158 mm | 15 | 15 h/day | 81 % | 82 % | 17 km/h |
| July | 163 mm | 15 | 14 h/day | 76 % | 84 % | 17 km/h |
| August | 124 mm | 13 | 14 h/day | 67 % | 82 % | 16 km/h |
| September | 175 mm | 14 | 12 h/day | 69 % | 82 % | 17 km/h |
| October | 188 mm | 12 | 11 h/day | 63 % | 81 % | 16 km/h |
| November | 83 mm | 9 | 10 h/day | 52 % | 78 % | 15 km/h |
| December | 56 mm | 6 | 9.7 h/day | 40 % | 74 % | 16 km/h |
Planning a trip? See the best time to visit Tsukuba.
QuestionsCommon questions about Tsukuba’s climate
When is the best time to visit Tsukuba?
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 Tsukuba get?
In August, the warmest month, daily highs average 30 °C. About 35 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.
How cold does it get in winter?
Nights average -0.9 °C in January, the coldest month. A normal year has 53 nights below freezing.
Which month is wettest in Tsukuba?
October, averaging 188 mm over 12 days with rain. The driest month is December with 56 mm. The year as a whole averages 1,412 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 Tsukuba 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
- 36.083°, 140.117° (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.