Climate averages 1991–2020
Yamagata weather
in September.
A warm, wet month: the 3rd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Yamagata: daytime highs average 22.8°C and nights cool to about 15.5°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 125 mm of rain on roughly 13 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 28 min on an average September day.
The nearest other city in this atlas is Yonezawa (42 km away). In September its highs average 23.6°C, 0.8°C warmer than Yamagata, with 155 mm of rain.
Among the 303 cities listed in Japan, Yamagata ranks joint 285th of 303 for the warmest September highs and 2nd of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Yamagata is 2.9°C cooler than that mean.
From September to October, average highs fall by 5.9°C to 16.9°C, and monthly rainfall falls from 125 mm to 118 mm.
The annual picture
September in context
Monthly precipitation
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
Yamagata climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 0.8°C-6.4°C | -6.4°C | 126 | 21.8 | 9.810 h |
| February | 1.8°C-6.0°C | -6.0°C | 91 | 18.1 | 10.711 h |
| March | 5.6°C-3.1°C | -3.1°C | 109 | 16.9 | 11.912 h |
| April | 12.8°C2.0°C | 2.0°C | 94 | 13.7 | 13.213 h |
| May | 19.2°C8.4°C | 8.4°C | 91 | 11.9 | 14.214 h |
| June | 22.6°C13.8°C | 13.8°C | 119 | 12.5 | 14.815 h |
| July | 25.7°C18.4°C | 18.4°C | 189 | 17.4 | 14.515 h |
| August | 26.9°C19.5°C | 19.5°C | 146 | 14.8 | 13.614 h |
| September, selected | 22.8°C15.5°C | 15.5°C | 125 | 13.0 | 12.512 h |
| October | 16.9°C8.7°C | 8.7°C | 118 | 12.4 | 11.211 h |
| November | 10.6°C2.2°C | 2.2°C | 95 | 15.3 | 10.110 h |
| December | 3.9°C-3.0°C | -3.0°C | 120 | 20.0 | 9.610 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
September in nearby cities
- Yonezawa in SeptemberJapan · 42 kmHigh 23.6°C · Low 16.7°C · 155 mm rain
- Sendai in SeptemberJapan · 44 kmHigh 23.3°C · Low 17.7°C · 167 mm rain
- Natori-shi in SeptemberJapan · 46 kmHigh 23.4°C · Low 18.4°C · 179 mm rain
- Fukushima in SeptemberJapan · 54 kmHigh 24.1°C · Low 16.9°C · 169 mm rain
- Ōsaki in SeptemberJapan · 66 kmHigh 23.6°C · Low 16.7°C · 168 mm rain
- Tsuruoka in SeptemberJapan · 72 kmHigh 23.8°C · Low 18.5°C · 180 mm rain
- Ishinomaki in SeptemberJapan · 84 kmHigh 23.1°C · Low 19.2°C · 151 mm rain
- Tome in SeptemberJapan · 87 kmHigh 23.6°C · Low 17.0°C · 145 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 Yamagata) is explained once on the Yamagata year overview and on the Sources, method and limits page.