The weather in Hamilton in September is very hot. The average temperatures are between 26°C and 27°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Hamilton. 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 Hamilton in September 2025.
If you’re planning to visit Hamilton in the near future, we highly recommend that you review the 14 day weather forecast for Hamilton before you arrive.
Temperatures
27° / 26°
Rainy Days
8
Snowy Days
0
Dry Days
22
Rainfall
228
mm
Sun Hours
11.2
Hrs
