Shannon Weather in September
What's the weather like in Shannon (Munster) in September 2025?
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 |
| Humidity | 84% |
| 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.
September temperatures in Shannon
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 Shannon in September 2025.
Other monthly averages
Best places to visit in September
Shannon weather stats
| Hottest month: | July | 19.2°C 66.6°F |
|---|---|---|
| Driest month: | April | 59mm 2.3ins |
| Sunniest month: | May | 6.2hrs |
| Coldest month: | January | 8.1°C 46.6°F |
| Wettest month: | December | 109mm 4.3ins |
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