Climate averages 1991–2020
Oyama weather
in April.
A mild, wet month: the 7th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Oyama: daytime highs average 17.4°C and nights cool to about 6.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 120 mm of rain on roughly 13 days, which makes April a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 06 min on an average April day.
The nearest other city in this atlas is Tochigi (11 km away). In April its highs average 17.4°C, about as warm as Oyama, with 136 mm of rain.
Among the 303 cities listed in Japan, Oyama ranks joint 146th of 303 for the warmest April highs and joint 129th of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Oyama is 0.7°C warmer than that mean.
From April to May, average highs rise by 4.6°C to 22.1°C, and monthly rainfall rises from 120 mm to 153 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Tochigi in AprilJapan · 11 kmHigh 17.4°C · Low 6.5°C · 136 mm rain
- Koga in AprilJapan · 15 kmHigh 17.7°C · Low 7.1°C · 120 mm rain
- Chikusei in AprilJapan · 16 kmHigh 17.7°C · Low 7.2°C · 107 mm rain
- Sano in AprilJapan · 20 kmHigh 17.5°C · Low 6.8°C · 121 mm rain
- Mooka in AprilJapan · 24 kmHigh 17.5°C · Low 6.5°C · 109 mm rain
- Tatebayashi in AprilJapan · 25 kmHigh 17.6°C · Low 6.8°C · 121 mm rain
- Kazo in AprilJapan · 27 kmHigh 17.9°C · Low 7.4°C · 106 mm rain
- Kukichūō in AprilJapan · 28 kmHigh 18.0°C · Low 7.5°C · 105 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.