Weather on September 21 in Dublin
Historical weather data for September 21 in Dublin, Ireland
Based on 56 years of data from DUBLIN PHOENIX PARK
About This Date
September 21st in Dublin, Ireland typically brings mild fall weather, with average highs around 18°C and lows near 9°C. Over 56 years of records, the warmest September 21st was in 2026 (19°C average), while the coldest was 1979 (9°C) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 52% of September 21st dates historically, with the wettest September 21st recording 0.54" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
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) |
|---|---|---|---|
| 2026 | 25°C (77°F) | 13°C (56°F) | -- |
| 2025 | 14°C (58°F) | 6°C (42°F) | 1 mm |
| 2024 | 16°C (61°F) | 14°C (58°F) | 2 mm |
| 2023 | 17°C (63°F) | 6°C (42°F) | 0 mm |
| 2022 | 18°C (65°F) | 11°C (51°F) | 14 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) | 10 mm |
| 2018 | 16°C (61°F) | 6°C (43°F) | 1 mm |
| 2017 | 17°C (62°F) | 9°C (49°F) | 1 mm |
| 2016 | 16°C (61°F) | 8°C (46°F) | 5 mm |
| 2015 | 17°C (63°F) | 11°C (51°F) | 8 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) | -- | 6 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) | 8 mm |
| 2006 | 19°C (67°F) | -- | 3 mm |
| 2005 | 21°C (69°F) | 11°C (51°F) | 0 mm |
| 2004 | 16°C (60°F) | 8°C (47°F) | 2 mm |
| 2003 | 22°C (72°F) | 6°C (42°F) | 6 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) | 4 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) | 3 mm |
| 1992 | 14°C (57°F) | 5°C (41°F) | 0 mm |
| 1991 | 19°C (66°F) | 10°C (50°F) | 6 mm |
| 1990 | 14°C (57°F) | 4°C (40°F) | 0 mm |
| 1989 | 19°C (66°F) | 14°C (57°F) | 4 mm |
| 1988 | 16°C (61°F) | 7°C (45°F) | 3 mm |
| 1987 | 18°C (64°F) | 10°C (50°F) | 5 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) | 2 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) | 0 mm |
| 1979 | 13°C (56°F) | 4°C (39°F) | 2 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) | 2 mm |
| 1975 | 17°C (63°F) | 8°C (47°F) | 0 mm |
| 1974 | 14°C (57°F) | 7°C (44°F) | 1 mm |
| 1973 | 16°C (60°F) | 6°C (42°F) | 2 mm |
| 1972 | 17°C (62°F) | 11°C (51°F) | 0 mm |
| 1971 | 19°C (67°F) | 14°C (57°F) | 0 mm |