Climate averages 1991–2020
Sayama weather
in July.
A warm, very wet month: the 2nd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in Sayama: daytime highs average 27.9°C and nights cool to about 21.1°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 182 mm of rain on roughly 16 days, which makes July a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 20 min on an average July day.
The nearest other city in this atlas is Iruma (6 km away). In July its highs average 27.5°C, about as warm as Sayama, with 243 mm of rain.
Among the 303 cities listed in Japan, Sayama ranks joint 186th of 303 for the warmest July highs and joint 96th of 303 for the driest July (rainfall, lowest first). The mean July high of those 303 cities is 27.9°C; Sayama is level with that mean.
From July to August, average highs rise by 1.2°C to 29.1°C, and monthly rainfall falls from 182 mm to 142 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
Sayama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.5°C-2.6°C | -2.6°C | 69 | 7.5 | 10.010 h |
| February | 8.5°C-1.8°C | -1.8°C | 66 | 8.5 | 10.911 h |
| March | 12.0°C1.6°C | 1.6°C | 120 | 13.2 | 11.912 h |
| April | 17.2°C6.8°C | 6.8°C | 123 | 12.8 | 13.113 h |
| May | 21.6°C12.3°C | 12.3°C | 139 | 13.1 | 14.014 h |
| June | 24.2°C16.9°C | 16.9°C | 177 | 15.4 | 14.515 h |
| July, selected | 27.9°C21.1°C | 21.1°C | 182 | 16.4 | 14.314 h |
| August | 29.1°C22.3°C | 22.3°C | 142 | 15.4 | 13.514 h |
| September | 25.3°C18.8°C | 18.8°C | 204 | 14.9 | 12.412 h |
| October | 19.9°C12.7°C | 12.7°C | 215 | 13.7 | 11.311 h |
| November | 14.8°C6.2°C | 6.2°C | 92 | 10.2 | 10.310 h |
| December | 10.0°C0.5°C | 0.5°C | 61 | 7.4 | 9.810 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
- Iruma in JulyJapan · 6 kmHigh 27.5°C · Low 20.9°C · 243 mm rain
- Tokorozawa in JulyJapan · 8 kmHigh 27.7°C · Low 21.2°C · 182 mm rain
- Hannō in JulyJapan · 8 kmHigh 28.1°C · Low 21.5°C · 243 mm rain
- Kawagoe in JulyJapan · 9 kmHigh 28.1°C · Low 21.3°C · 170 mm rain
- Sakado in JulyJapan · 12 kmHigh 28.3°C · Low 21.5°C · 170 mm rain
- Niiza in JulyJapan · 14 kmHigh 28.5°C · Low 21.8°C · 182 mm rain
- Ōme in JulyJapan · 17 kmHigh 28.0°C · Low 21.4°C · 243 mm rain
- Hino in JulyJapan · 20 kmHigh 27.5°C · Low 21.2°C · 182 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 Sayama) is explained once on the Sayama year overview and on the Sources, method and limits page.
Tokorozawa, Fuchū and Hino lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.