Kilkenny Weather in September
September in Kilkenny brings moderate temperatures, with highs of 18°C (64°F) and nights dropping to 10°C (50°F). Rainfall is on the higher side this month, averaging around 69 mm (2.7 in), so keep a rain jacket handy.
Rainfall in Kilkenny in September
Expect around 16 days of rain based on historical data, with 69 mm (2.7 in) average. 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 Kilkenny in September
Daytime highs in Kilkenny in September reach 18°C (64°F), with nights around 10°C (50°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. 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.For Kilkenny itself, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Kilkenny Temperature in September
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Kilkenny Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Kilkenny - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Kilkenny typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 11°C (52°F).
Average temperatures in September
Historical weather records for Kilkenny in September
Browse day-by-day weather records for Kilkenny spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Kilkenny historical weather extremes in September
Based on 49 years of weather observations in Kilkenny between 1976 and 2025, these are the recorded extremes.
- The hottest September day on record in Kilkenny reached 26°C (79°F) (September 3, 1991).
- Kilkenny experienced its chilliest September day on September 20, 2018, reaching only 10°C (50°F).
- Nighttime temperatures dropped to -1°C (30°F) on September 19, 1986, marking the coldest September night on record.
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 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 Kilkenny in September
For Kilkenny in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket.
What To Do in Kilkenny in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling6/10 -
Walking6/10 -
Camping4/10 -
Outdoor sports10/10
Kilkenny 3-Day Forecast
See the full Kilkenny climate overview or explore weather in Ireland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Westport
17°C (63°F) Doolin17°C (63°F) Kilkenny
18°C (64°F) Cork18°C (64°F) Kenmare18°C (64°F) Killarney17°C (63°F) Galway18°C (64°F) Dublin18°C (64°F) 
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