Weather on September 21 in Dublin
Historical weather data for September 21 in Dublin, Ireland
Based on 55 years of data from DUBLIN PHOENIX PARK
About This Date
September 21st in Dublin, Ireland typically brings mild fall weather, with average highs around 17°C and lows near 9°C. Over 55 years of records, the warmest September 21st was in 2013 (17°C average), while the coldest was 1979 (9°C) — a 15°F range across recorded history. Rain or other precipitation has occurred on about 56% of September 21st dates historically, with the wettest September 21st recording 1.36" of rain. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for September 21st in Dublin? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 14°C (58°F) | 6°C (42°F) | 3 mm |
| 2024 | 16°C (61°F) | 14°C (58°F) | 5 mm |
| 2023 | 17°C (63°F) | 6°C (42°F) | 0 mm |
| 2022 | 18°C (65°F) | 11°C (51°F) | 35 mm |
| 2021 | 18°C (65°F) | 12°C (53°F) | 0 mm |
| 2020 | 21°C (69°F) | 7°C (44°F) | 0 mm |
| 2019 | 21°C (69°F) | 13°C (55°F) | 25 mm |
| 2018 | 16°C (61°F) | 6°C (43°F) | 2 mm |
| 2017 | 17°C (62°F) | 9°C (49°F) | 3 mm |
| 2016 | 16°C (61°F) | 8°C (46°F) | 12 mm |
| 2015 | 17°C (63°F) | 11°C (51°F) | 21 mm |
| 2014 | 18°C (64°F) | 6°C (42°F) | 0 mm |
| 2013 | 24°C (75°F) | 11°C (51°F) | 0 mm |
| 2012 | 13°C (55°F) | -- | 15 mm |
| 2011 | 15°C (59°F) | 10°C (50°F) | -- |
| 2010 | 19°C (67°F) | 12°C (53°F) | -- |
| 2009 | 19°C (67°F) | 12°C (53°F) | -- |
| 2008 | 18°C (65°F) | 8°C (46°F) | -- |
| 2007 | 16°C (61°F) | 11°C (51°F) | 21 mm |
| 2006 | 19°C (67°F) | -- | 8 mm |
| 2005 | 21°C (69°F) | 11°C (51°F) | 0 mm |
| 2004 | 16°C (60°F) | 8°C (47°F) | 5 mm |
| 2003 | 22°C (72°F) | 6°C (42°F) | 15 mm |
| 2002 | 19°C (67°F) | 6°C (43°F) | 0 mm |
| 2001 | 17°C (62°F) | 6°C (42°F) | 0 mm |
| 2000 | 20°C (68°F) | 7°C (45°F) | 9 mm |
| 1999 | 19°C (67°F) | 12°C (53°F) | 0 mm |
| 1998 | 22°C (72°F) | 8°C (47°F) | 0 mm |
| 1997 | 19°C (66°F) | 14°C (57°F) | 0 mm |
| 1996 | 16°C (61°F) | 11°C (52°F) | 0 mm |
| 1995 | 17°C (63°F) | 7°C (44°F) | 0 mm |
| 1994 | 17°C (62°F) | 9°C (49°F) | 0 mm |
| 1993 | 18°C (64°F) | 8°C (47°F) | 8 mm |
| 1992 | 14°C (57°F) | 5°C (41°F) | 0 mm |
| 1991 | 19°C (66°F) | 10°C (50°F) | 15 mm |
| 1990 | 14°C (57°F) | 4°C (40°F) | 1 mm |
| 1989 | 19°C (66°F) | 14°C (57°F) | 10 mm |
| 1988 | 16°C (61°F) | 7°C (45°F) | 7 mm |
| 1987 | 18°C (64°F) | 10°C (50°F) | 12 mm |
| 1986 | 15°C (59°F) | 7°C (45°F) | 0 mm |
| 1985 | 21°C (70°F) | 10°C (50°F) | 0 mm |
| 1984 | 14°C (57°F) | 5°C (41°F) | 4 mm |
| 1983 | 14°C (57°F) | 6°C (43°F) | 0 mm |
| 1982 | 16°C (61°F) | 5°C (41°F) | 0 mm |
| 1981 | 17°C (62°F) | 8°C (46°F) | 1 mm |
| 1980 | 18°C (64°F) | 9°C (49°F) | 1 mm |
| 1979 | 13°C (56°F) | 4°C (39°F) | 4 mm |
| 1978 | 23°C (73°F) | 11°C (52°F) | 0 mm |
| 1977 | 13°C (55°F) | 8°C (46°F) | 1 mm |
| 1976 | 16°C (60°F) | 13°C (55°F) | 6 mm |
| 1975 | 17°C (63°F) | 8°C (47°F) | 0 mm |
| 1974 | 14°C (57°F) | 7°C (44°F) | 3 mm |
| 1973 | 16°C (60°F) | 6°C (42°F) | 6 mm |
| 1972 | 17°C (62°F) | 11°C (51°F) | 1 mm |
| 1971 | 19°C (67°F) | 14°C (57°F) | 0 mm |