Semboku, Japan Climate
The warmest month is August, with an average high of 27°C; the coldest is February, with an average low of -7°C. A normal year brings 1573 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 25
- Normal high
- 21°C
- Normal low
- 12°C
- Reanalysis high
- 26°Cin 2016
- Reanalysis low
- 6°Cin 2011
- Chance of a wet day
- 49%
- Daylight
- 12 h 03 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | -1°C | -7°C | 7°C (1997) | -16°C (2001) | 109 mm | 21.7 |
| February | -1°C | -7°C | 14°C (2010) | -17°C (2018) | 85 mm | 19.8 |
| March | 4°C | -4°C | 18°C (2018) | -14°C (2001) | 93 mm | 15.5 |
| April | 12°C | 1°C | 24°C (2015) | -5°C (1999) | 99 mm | 12.0 |
| May | 18°C | 7°C | 32°C (2019) | -2°C (1992) | 115 mm | 12.4 |
| June | 23°C | 12°C | 31°C (2014) | 5°C (2011) | 120 mm | 12.0 |
| July | 26°C | 17°C | 36°C (2000) | 9°C (1993) | 189 mm | 15.5 |
| August | 27°C | 18°C | 38°C (1994) | 9°C (1991) | 180 mm | 15.5 |
| September | 23°C | 14°C | 35°C (2006) | 2°C (2001) | 153 mm | 15.0 |
| October | 16°C | 7°C | 30°C (2019) | -2°C (2016) | 146 mm | 15.5 |
| November | 9°C | 1°C | 21°C (2003) | -9°C (1998) | 144 mm | 18.0 |
| December | 2°C | -3°C | 14°C (2018) | -13°C (2001) | 140 mm | 21.7 |
| Year | 13°C | 5°C | 1573 mm | 195 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
1573 mm in a normal year, most in July.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Semboku.
The muggiest month is August, when 69 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | -5°C | 96% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | -5°C | 94% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | -2°C | 88% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 3°C | 82% | 100% | 0% | 0% | 0% | 0% | 0% |
| May | 9°C | 81% | 91% | 9% | 0% | 0% | 0% | 0% |
| June | 14°C | 83% | 35% | 40% | 21% | 4% | 0% | 0% |
| July | 18°C | 85% | 1% | 13% | 34% | 41% | 11% | 0% |
| August | 19°C | 85% | 2% | 8% | 21% | 43% | 26% | 0% |
| September | 15°C | 86% | 25% | 27% | 27% | 17% | 4% | 0% |
| October | 9°C | 86% | 86% | 11% | 3% | 0% | 0% | 0% |
| November | 3°C | 89% | 100% | 0% | 0% | 0% | 0% | 0% |
| December | -2°C | 93% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is August, with the sky 71 percent covered on average; the cloudiest is December, at 84 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is February, averaging 14.4 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 18, with 14 h 59 min of daylight; the shortest is Dec 20, with 9 h 21 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Semboku in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.