The climate in Shannon during September can be summarized as mild and a little damp.
September is in the fall / autumn in Shannon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 17°C (63°F), whilst at night 10°C (50°F) is normal.
|Daytime temperature||17.2°C 63°F|
|Nightly temperature||10°C 50°F|
|Average temperature||13.6°C 56.5°F|
|Daily sunshine||4 hrs|
|Avg rainfall||91 mm 3.6 ins|
|Rainy days||18 days|
|Sea temperature||15.4°C 59.6°F|
|Windspeed||16.9kph 11 mph|
On average September is the 5th wettest month of the year in Shannon with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 4 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 Shannon in September 2023.
|Hottest month:||July||19.2°C 66.6°F|
|Driest month:||April||59mm 2.3ins|
|Coldest month:||January||8.1°C 46.6°F|
|Wettest month:||December||109mm 4.3ins|