Antrim Weather in September
What's the weather like in Antrim (N Ireland) in September 2025?
The climate in Antrim during September can be summarized as mild and a little damp.
September is in the fall / autumn in Antrim and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 16°C (60°F), whilst at night 8°C (47°F) is normal.
| Daytime temperature | 15.6°C 60.1°F |
|---|---|
| Nightly temperature | 8.4°C 47.1°F |
| Average temperature | 12°C 53.6°F |
| Daily sunshine | 4 hrs |
| Avg rainfall | 91 mm 3.6 ins |
| Rainy days | 19 days |
| Sea temperature | 14.6°C 58.3°F |
| Humidity | 88% |
| Windspeed | 19.1kph 12 mph |
On average September is the 3rd wettest month of the year in Antrim with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 19 days, although this may vary considerably.
On the flip side this corresponds to an average of 4 hours of sunshine per day.
September temperatures in Antrim
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Antrim in September 2025.
Other monthly averages
Best places to visit in September
Antrim weather stats
| Hottest month: | July | 17.9°C 64.2°F |
|---|---|---|
| Driest month: | April | 57mm 2.2ins |
| Sunniest month: | May | 6.4hrs |
| Coldest month: | January | 6.3°C 43.3°F |
| Wettest month: | October | 96mm 3.8ins |
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