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.
Temperatures
25° / 20°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
169
mm
Sun Hours
6.0
Hrs
