The climate in Belfast during September can be summarized as mild and a little damp.
September is in the fall / autumn in Belfast and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 16°C (61°F), whilst at night 9°C (48°F) is normal.
|Daytime temperature||15.9°C 60.6°F|
|Nightly temperature||8.9°C 48°F|
|Average temperature||12.4°C 54.3°F|
|Daily sunshine||4.2 hrs|
|Avg rainfall||94 mm 3.7 ins|
|Rainy days||17 days|
|Sea temperature||14.7°C 58.5°F|
|Windspeed||19.1kph 12 mph|
On average September is the 5th wettest month of the year in Belfast with around 94mm 3.7 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 4.2 hours of sunshine per day.
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 Belfast in September 2022.
|Hottest month:||July||18.2°C 64.8°F|
|Driest month:||April||63mm 2.5ins|
|Coldest month:||January||6.7°C 44.1°F|
|Wettest month:||January||101mm 4ins|