Climate averages 1991–2020
Hitachi weather
by month.
See how the year changes. August has the highest average daily maximum; December (tied with February) has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Hitachi averages a daytime high of 17.3°C and a nighttime low of 11.3°C, with about 1,525 mm of rain on roughly 140 days. August is the warmest month (average high 27.8°C) and January the coolest (7.3°C). October is the wettest month with 211 mm; December (tied with February) is the driest with 72 mm.
The annual picture
A year in Hitachi
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hitachi climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.3°C1.3°C | 1.3°C | 73 | 8.1 | 10.010 h |
| February | 7.9°C1.2°C | 1.2°C | 72 | 8.3 | 10.811 h |
| March | 11.1°C3.5°C | 3.5°C | 127 | 12.7 | 11.912 h |
| April | 15.8°C7.8°C | 7.8°C | 125 | 12.0 | 13.113 h |
| May | 20.0°C12.9°C | 12.9°C | 144 | 12.5 | 14.114 h |
| June | 22.9°C17.3°C | 17.3°C | 148 | 14.3 | 14.615 h |
| July | 26.4°C21.3°C | 21.3°C | 162 | 14.1 | 14.414 h |
| August | 27.8°C22.9°C | 22.9°C | 111 | 11.4 | 13.614 h |
| September | 24.7°C20.1°C | 20.1°C | 174 | 14.1 | 12.412 h |
| October | 19.8°C14.8°C | 14.8°C | 211 | 13.2 | 11.311 h |
| November | 14.8°C9.0°C | 9.0°C | 108 | 10.1 | 10.310 h |
| December | 9.7°C3.9°C | 3.9°C | 72 | 8.7 | 9.710 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- Hitachi-NakaJapan · 25 kmHigh 17.4°C · Low 11.3°C · 1,502 mm rain a year
- MitoJapan · 33 kmHigh 17.9°C · Low 10.7°C · 1,540 mm rain a year
- Kasama, JapanJapan · 42 kmHigh 17.3°C · Low 9.5°C · 1,451 mm rain a year
- IwakiJapan · 54 kmHigh 17.0°C · Low 10.9°C · 1,590 mm rain a year
- IshiokaJapan · 58 kmHigh 18.5°C · Low 11.1°C · 1,454 mm rain a year
- MookaJapan · 60 kmHigh 18.4°C · Low 9.3°C · 1,344 mm rain a year
- ŌtawaraJapan · 62 kmHigh 16.7°C · Low 8.1°C · 1,505 mm rain a year
- NasushiobaraJapan · 67 kmHigh 16.2°C · Low 8.0°C · 1,673 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+9, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 36.60°, 140.60° (5 km from the city centre), adjusted up by 0.5°C for the difference between the city's elevation (51 m) and the cell's (131 m). Rain comes from the 0.25° cell at 36.50°, 140.75°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.