Click on a day for an hourly weather forecast
The weather in Niigata in September is hot. The average temperatures are between 20°C and 25°C.
You can expect rain for roughly half of the month of September in Niigata. 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 Niigata in September 2025.
If you’re planning to visit Niigata in the near future, we highly recommend that you review the 14 day weather forecast for Niigata before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / 1° | 20 | 6 | 6 | 181 mm | Awful | Niigata in January |
| February | 5° / 1° | 15 | 9 | 4 | 118 mm | Awful | Niigata in February |
| March | 9° / 4° | 12 | 19 | 1 | 128 mm | Bad | Niigata in March |
| April | 14° / 7° | 9 | 21 | 0 | 112 mm | Ok | Niigata in April |
| May | 19° / 12° | 7 | 24 | 0 | 116 mm | Ok | Niigata in May |
| June | 23° / 17° | 9 | 21 | 0 | 130 mm | Good | Niigata in June |
| July | 27° / 22° | 13 | 18 | 0 | 272 mm | Good | Niigata in July |
| August | 28° / 23° | 12 | 19 | 0 | 191 mm | Good | Niigata in August |
| September | 25° / 20° | 10 | 20 | 0 | 169 mm | Good | Niigata in September |
| October | 19° / 14° | 10 | 21 | 0 | 157 mm | Ok | Niigata in October |
| November | 14° / 9° | 13 | 17 | 0 | 178 mm | Ok | Niigata in November |
| December | 8° / 4° | 19 | 10 | 2 | 235 mm | Awful | Niigata in December |