Dublin Weather in September

During September, Dublin experiences moderate daytime temperatures of 18°C (64°F) and cooler nights around 11°C (52°F). Expect quite a bit of rainfall. Around 74 mm (2.9 in) is typical.

Rainfall in Dublin in September

Typically, about 15 days will experience rainfall, with an average of 74 mm (2.9 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 Dublin in September

In September, Dublin sees moderate temperatures, with highs of 18°C (64°F). Nights drop to around 11°C (52°F). A light jacket or extra layer can be useful, especially outside the warmest hours 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 Dublin in September

With about 128 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

Wind Speed in Dublin in September

September sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

Average water temperature in September

At 15°C (59°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.

Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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

Dublin Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 18°C (64°F)  

Water Temperature 15°C (59°F)  

Chance of Rain 50%  

Precipitation 74 mm (2.9 in)  

Rainy days 15 days  

Humidity 71%  

Windspeed 4 m/s (8 knots)  

Sunshine 128 hours  

Percentage Sunshine 33%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Dublin 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

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

Historical weather for Dublin in September

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

Historical weather Temperatures Precipitation

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

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

Dublin historical weather extremes in September

According to our 49 years of weather records for Dublin, the following extremes were recorded between 1976 and 2025.

• Dublin recorded its highest September temperature of 26°C (79°F) on September 6, 2023.
• The coldest September day was on September 17, 2013, with a maximum of 10°C (50°F).
• The lowest overnight temperature recorded in September was 1°C (34°F) (September 26, 2020).
• Peak precipitation in September occurred on September 5, 2008, when 35 mm (1.4 in) of precipitation was measured.

What to Wear in Dublin 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. Rain gear is recommended, you can expect wet weather on multiple 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. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Dublin 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 Dublin's climate page.

More climate data for Dublin

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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