Click on a day for an hourly weather forecast
The weather in Yamagata in September is very hot. The average temperatures are between 23°C and 27°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Yamagata. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Yamagata in September 2025.
If you’re planning to visit Yamagata in the near future, we highly recommend that you review the 14 day weather forecast for Yamagata before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 10° / 7° | 9 | 20 | 3 | 113 mm | Awful | Yamagata in January |
| February | 11° / 7° | 8 | 19 | 1 | 171 mm | Bad | Yamagata in February |
| March | 14° / 10° | 7 | 23 | 0 | 199 mm | Ok | Yamagata in March |
| April | 18° / 13° | 7 | 23 | 0 | 212 mm | Ok | Yamagata in April |
| May | 22° / 17° | 7 | 24 | 0 | 245 mm | Ok | Yamagata in May |
| June | 24° / 21° | 12 | 18 | 0 | 535 mm | Good | Yamagata in June |
| July | 28° / 24° | 14 | 17 | 0 | 588 mm | Good | Yamagata in July |
| August | 30° / 26° | 11 | 20 | 0 | 458 mm | Ok | Yamagata in August |
| September | 27° / 23° | 10 | 20 | 0 | 313 mm | Good | Yamagata in September |
| October | 23° / 19° | 5 | 26 | 0 | 172 mm | Perfect | Yamagata in October |
| November | 18° / 14° | 6 | 24 | 0 | 170 mm | Good | Yamagata in November |
| December | 12° / 9° | 8 | 23 | 1 | 162 mm | Bad | Yamagata in December |