Dublin Weather in September
In September, Dublin averages a high of 18°C (64°F) and a low of 9°C (49°F), from 55 years of daily records (1971–2026).
18°C
Average high
64°F
9°C
Average low
49°F
27°C
Record high
80°F · September 8, 2023
0°C
Record low
32°F · September 22, 1979
What September Is Like in Dublin
- The coldest September reading, 0°C (32°F) on September 22, 1979, has not been matched in 47 years.
- September in Dublin has become 0.9°C (1.6°F) warmer on average: the 2011–2025 average against 1970–1989.
- The warmest September in the record was 2021; the coldest was 1974.
At least 1 mm of rain falls on 38% of September days, and the month averages 64 mm in total.
Warmest: 2021 (19.6°C)Latest: 2025 (17.7°C)10-year averageLong-run average (17.6°C)
Look Up a Day in September
See the weather in Dublin on any September date, year by year.
Source: NOAA GHCN-Daily, Dublin Phoenix Park (1971–2026). Averages cover 1971–2026. How we compute this