The temperatures in New Plymouth in September are quite cold with temperatures between 9°C and 14°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in New Plymouth. 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 New Plymouth in September 2025.
If you’re planning to visit New Plymouth in the near future, we highly recommend that you review the 14 day weather forecast for New Plymouth before you arrive.
Temperatures
14° / 9°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
220
mm
Sun Hours
8.7
Hrs
