Climate averages 1991–2020
Oyama weather
in July.
A hot, very wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Oyama: daytime highs average 28.2°C and nights cool to about 21.0°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 209 mm of rain on roughly 19 days, which makes July a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 22 min on an average July day.
The nearest other city in this atlas is Tochigi (11 km away). In July its highs average 28.1°C, about as warm as Oyama, with 262 mm of rain.
Among the 303 cities listed in Japan, Oyama ranks joint 163rd of 303 for the warmest July highs and joint 164th of 303 for the driest July (rainfall, lowest first). The mean July high of those 303 cities is 27.9°C; Oyama is 0.4°C warmer than that mean.
From July to August, average highs rise by 1.3°C to 29.5°C, and monthly rainfall falls from 209 mm to 161 mm.
The annual picture
July in context
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
Oyama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.3°C-2.1°C | -2.1°C | 55 | 6.0 | 10.010 h |
| February | 8.4°C-1.5°C | -1.5°C | 55 | 6.9 | 10.811 h |
| March | 12.2°C1.6°C | 1.6°C | 106 | 11.6 | 11.912 h |
| April | 17.4°C6.8°C | 6.8°C | 120 | 12.6 | 13.113 h |
| May | 22.1°C12.4°C | 12.4°C | 153 | 13.7 | 14.114 h |
| June | 24.7°C16.9°C | 16.9°C | 177 | 16.5 | 14.615 h |
| July, selected | 28.2°C21.0°C | 21.0°C | 209 | 18.7 | 14.414 h |
| August | 29.5°C22.3°C | 22.3°C | 161 | 16.3 | 13.514 h |
| September | 25.7°C18.9°C | 18.9°C | 206 | 16.2 | 12.412 h |
| October | 20.2°C12.7°C | 12.7°C | 200 | 13.9 | 11.311 h |
| November | 14.9°C5.9°C | 5.9°C | 88 | 9.4 | 10.310 h |
| December | 9.7°C0.4°C | 0.4°C | 54 | 6.8 | 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
July in nearby cities
- Tochigi in JulyJapan · 11 kmHigh 28.1°C · Low 20.9°C · 262 mm rain
- Koga in JulyJapan · 15 kmHigh 28.4°C · Low 21.3°C · 209 mm rain
- Chikusei in JulyJapan · 16 kmHigh 28.7°C · Low 21.3°C · 165 mm rain
- Sano in JulyJapan · 20 kmHigh 28.2°C · Low 21.1°C · 220 mm rain
- Mooka in JulyJapan · 24 kmHigh 28.3°C · Low 20.8°C · 173 mm rain
- Tatebayashi in JulyJapan · 25 kmHigh 28.3°C · Low 21.1°C · 220 mm rain
- Kazo in JulyJapan · 27 kmHigh 28.7°C · Low 21.5°C · 170 mm rain
- Kukichūō in JulyJapan · 28 kmHigh 28.7°C · Low 21.5°C · 159 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Oyama) is explained once on the Oyama year overview and on the Sources, method and limits page.
Koga lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.