Carrick on Shannon Weather in September
September in Carrick on Shannon brings moderate temperatures around 17°C (63°F) during the day, dropping to 10°C (50°F) at night, with quite a bit of rainfall expected, averaging around 90 mm (3.5 in) for the month.
Rainfall in Carrick on Shannon in September
You can expect rain on roughly 20 days based on historical data, averaging 90 mm (3.5 in) for the month. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Carrick on Shannon in September
Daytime temperatures in Carrick on Shannon reach 17°C (63°F) in September, dropping to 10°C (50°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 10°C (50°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Carrick on Shannon in September
With limited sunshine this month, there are about 93 hours of sun. It's ideal for those who prefer a cooler, cloudier climate.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Carrick on Shannon's climate page.
Carrick on Shannon Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
17°C (63°F)
Chance of Rain
67%
Precipitation
90 mm (3.5 in)
Rainy days
20 days
Humidity
83% *
Sunshine
93 hours *
Percentage Sunshine
26% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Carrick on Shannon typically stay consistent throughout September, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Carrick on Shannon in September
Browse day-by-day weather records for Carrick on Shannon spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Carrick on Shannon historical weather extremes in September
The extremes listed below come from historical weather data collected in Carrick on Shannon from 1976 through 2025.
- The hottest September day on record in Carrick on Shannon reached 26°C (79°F) (September 7, 2023).
- On September 26, 2024, Carrick on Shannon saw its coldest September day with temperatures maxing out at 9°C (48°F).
- The lowest overnight temperature recorded in September was 0°C (32°F) (September 30, 1991).
Best Places in Ireland in September
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Carrick on Shannon in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. You can probably leave your sunglasses at home, because sunny days are pretty rare this month.What To Do in Carrick on Shannon in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Carrick on Shannon's climate page.
Temperature Rainfall Sunshine Humidity
See the full Carrick on Shannon climate overview or explore weather in Ireland.
