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Cong Weather in September
September in Cong brings moderate temperatures, with daytime highs of 18°C (64°F) and nights around 10°C (50°F). Quite a bit of rainfall is expected, around 95 mm (3.7 in), so pack an umbrella.
Rainfall in Cong in September
Rain is expected on roughly 20 days, totalling around 95 mm (3.7 in) for the month. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.
Temperature in Cong in September
September in Cong brings moderate temperatures, with highs of 18°C (64°F) and nights around 10°C (50°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to 10°C (50°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Cong in September
This month sees fewer sunny days, with about 93 hours of sunshine, perfect for those who enjoy cooler temperatures.If your ideal day consists of dry skies and pleasant temperatures, September typically offers the best circumstances for Cong.
Cong Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
18°C (64°F)
Chance of Rain
68%
Precipitation
95 mm (3.7 in)
Rainy days
20 days
Humidity
83% *
Sunshine
93 hours *
Percentage Sunshine
26% *
* Data from: Claremorris, Ireland (28 KM, 17 Miles).
Cong Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Cong - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cong typically stay consistent throughout September, with daily highs averaging around 18°C (64°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 records for Cong in September
Browse day-by-day weather records for Cong spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cong historical weather extremes in September
According to our 50 years of weather records for Cong, the following extremes were recorded between 1976 and 2026.
- The hottest September day on record in Cong reached 26°C (79°F) (September 7, 2023).
- On September 26, 2024, Cong saw its coldest September day with temperatures maxing out at 10°C (50°F).
- The coldest night in September in Cong was on September 27, 1993, with a minimum of 0°C (32°F).
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
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Cong 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. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.
What To Do in Cong in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming4/10 -
Cycling6/10 -
Walking6/10 -
Camping4/10 -
Outdoor sports9/10
Cong 3-Day Forecast
More climate data for Cong
Temperature Rainfall Sunshine Humidity
See the full Cong climate overview or explore weather in Ireland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Westport
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