Clifden Weather in September
September in Clifden sees daytime temperatures around 17°C (63°F) and lows of 11°C (52°F) at night. With around 117 mm (4.6 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Clifden in September
You can typically expect 21 days of rain this month, averaging around 117 mm (4.6 in). Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Clifden in September
Daytime temperatures in Clifden reach 17°C (63°F) in September, dropping to 11°C (52°F) at night. The difference between afternoon and evening temperatures is usually noticeable. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Clifden in September
The area sees fewer sunny days, with a projection of about 93 hours of sunshine. This reduced sunlight makes it ideal for those who prefer overcast conditions over bright sunny days.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July and August typically offer the best weather for Clifden.
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 Clifden's climate page.
Clifden Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
17°C (63°F)
Chance of Rain
70%
Precipitation
117 mm (4.6 in)
Rainy days
21 days
Humidity
83% *
Sunshine
93 hours *
Percentage Sunshine
26% *
Daily Historical Temperatures
47-year average (1976-2025)
Based on our historical records, temperatures in Clifden 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 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
47-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 Clifden in September
Browse day-by-day weather records for Clifden spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Clifden historical weather extremes in September
Our historical data for Clifden spans 1999 to 2025, revealing these weather extremes.
- On September 7, 2023, temperatures climbed to 27°C (81°F), marking the warmest September day on record.
- The coldest September day was on September 24, 2012, with a maximum of 11°C (52°F).
- The lowest overnight temperature recorded in September was 1°C (34°F) (September 27, 2007).
- The wettest day in September Clifden was on September 11, 2015 with 53 mm (2.1 in) of precipitation.
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
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unpleasant
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What to Wear in Clifden in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. With limited sunshine expected, sunglasses aren't a priority for packing.What To Do in Clifden 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 Clifden's climate page.
Temperature Rainfall Sunshine Humidity
See the full Clifden climate overview or explore weather in Ireland.
