Blarney Weather in September

September in Blarney typically sees daytime highs of 18°C (64°F) and nighttime lows of 11°C (52°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Blarney in September

This month experiences about 17 days of rain according to historical data, averaging 75 mm (3 in). With rain spread across many days but low totals, showers are typically short and light rather than heavy.

Temperature in Blarney in September

Daytime highs in Blarney in September reach 18°C (64°F), with nights around 11°C (52°F). Conditions are often most pleasant around the middle of the day. With overnight lows of 11°C (52°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Blarney in September

The area experiences a moderate amount of sunshine, with approximately 128 hours of sunlight expected. This means a decent mix of sun and overcast.

Wind Speed in Blarney in September

September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in September

The water is 15°C (59°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Blarney.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Blarney's climate page.

Blarney Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 18°C (64°F)  

Water Temperature 15°C (59°F) *  

Chance of Rain 58%  

Precipitation 75 mm (3 in)  

Rainy days 17 days  

Humidity 75% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 128 hours *  

Percentage Sunshine 33% *  

* Data from: Cork, Ireland (10 KM, 6 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Blarney typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 12°C (54°F).

Average temperatures in September

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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

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Historical weather for Blarney in September

Browse day-by-day weather records for Blarney spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Blarney historical weather extremes in September

Our historical data for Blarney spans 1976 to 2025, revealing these weather extremes.

• The hottest September day on record in Blarney reached 25°C (77°F) (September 2, 1991).
• On September 22, 2018, Blarney saw its coldest September day with temperatures maxing out at 10°C (50°F).
• Nighttime temperatures dropped to 3°C (37°F) on September 15, 1986, marking the coldest September night on record.

What to Wear in Blarney 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. Wet weather is likely, so pack waterproof gear for multiple rainy days. The water temperature sits at about 15°C (59°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Blarney in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

6/10

Walking

6/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Ireland, check out our Blarney's climate page.

More climate data for Blarney

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Blarney climate overview or explore weather in Ireland.