The temperatures in Coleraine in September are usually low and can range between 11°C and 15°C.
You can expect rain for roughly half of the month of September in Coleraine. 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 Coleraine in September 2025.
If you’re planning to visit Coleraine in the near future, we highly recommend that you review the 14 day weather forecast for Coleraine before you arrive.
Temperatures
15° / 11°
Rainy Days
8
Snowy Days
0
Dry Days
22
Rainfall
107
mm
Sun Hours
2.9
Hrs
