Weather on September 21 in Vienna
Historical weather data for September 21 in Vienna, Austria
Based on 55 years of data from WIEN
About This Date
September 21st in Vienna, Austria typically brings mild fall weather, with average highs around 21°C and lows near 12°C. Over 55 years of records, the warmest September 21st was in 2023 (23°C average), while the coldest was 1977 (10°C) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 40% of September 21st dates historically, with the wettest September 21st recording 1.94" of rain. The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Vienna? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 29°C (85°F) | 17°C (62°F) | -- |
| 2024 | 23°C (73°F) | 9°C (49°F) | -- |
| 2023 | 28°C (83°F) | 17°C (62°F) | 0 mm |
| 2022 | 16°C (61°F) | 9°C (48°F) | 0 mm |
| 2021 | 17°C (62°F) | 11°C (51°F) | 3 mm |
| 2020 | 24°C (76°F) | 12°C (53°F) | 0 mm |
| 2019 | 20°C (68°F) | 6°C (42°F) | 0 mm |
| 2018 | 29°C (84°F) | 15°C (59°F) | 43 mm |
| 2017 | 17°C (62°F) | 10°C (50°F) | 0 mm |
| 2016 | 18°C (65°F) | 11°C (52°F) | 2 mm |
| 2015 | 19°C (66°F) | 11°C (51°F) | 0 mm |
| 2014 | 26°C (78°F) | 16°C (61°F) | 6 mm |
| 2013 | 17°C (63°F) | 13°C (55°F) | 7 mm |
| 2012 | 18°C (65°F) | 4°C (40°F) | 0 mm |
| 2011 | 20°C (68°F) | 12°C (54°F) | 0 mm |
| 2010 | 22°C (71°F) | 8°C (46°F) | 0 mm |
| 2009 | 24°C (75°F) | 13°C (55°F) | 0 mm |
| 2008 | 12°C (53°F) | 9°C (48°F) | 6 mm |
| 2007 | 18°C (65°F) | 6°C (42°F) | 0 mm |
| 2006 | 22°C (71°F) | 12°C (53°F) | 0 mm |
| 2005 | 16°C (61°F) | 9°C (49°F) | 1 mm |
| 2004 | 22°C (72°F) | 16°C (60°F) | 0 mm |
| 2003 | 29°C (85°F) | 13°C (55°F) | 0 mm |
| 2002 | 19°C (67°F) | 12°C (53°F) | 19 mm |
| 2001 | 20°C (68°F) | 9°C (49°F) | 6 mm |
| 2000 | 18°C (64°F) | 13°C (55°F) | 1 mm |
| 1999 | 23°C (73°F) | 15°C (59°F) | 38 mm |
| 1998 | 18°C (64°F) | 12°C (54°F) | 0 mm |
| 1997 | 17°C (62°F) | 4°C (40°F) | 0 mm |
| 1996 | 13°C (56°F) | 11°C (51°F) | 49 mm |
| 1995 | 16°C (60°F) | 12°C (53°F) | 1 mm |
| 1994 | 18°C (65°F) | 12°C (54°F) | 0 mm |
| 1993 | 22°C (71°F) | 13°C (55°F) | 0 mm |
| 1992 | 23°C (73°F) | 11°C (51°F) | 0 mm |
| 1991 | 21°C (69°F) | 12°C (54°F) | 0 mm |
| 1990 | 18°C (65°F) | 9°C (49°F) | 15 mm |
| 1989 | 25°C (77°F) | 15°C (59°F) | 0 mm |
| 1988 | 16°C (60°F) | 12°C (54°F) | 3 mm |
| 1987 | 25°C (77°F) | 16°C (61°F) | 0 mm |
| 1986 | 21°C (70°F) | 7°C (45°F) | 0 mm |
| 1985 | 28°C (82°F) | 15°C (59°F) | 0 mm |
| 1984 | 18°C (64°F) | 14°C (57°F) | 9 mm |
| 1983 | 21°C (69°F) | 10°C (50°F) | 0 mm |
| 1982 | 23°C (74°F) | 14°C (58°F) | 0 mm |
| 1981 | 24°C (75°F) | 15°C (59°F) | 0 mm |
| 1980 | 19°C (67°F) | 16°C (60°F) | 0 mm |
| 1979 | 21°C (70°F) | 14°C (57°F) | 0 mm |
| 1978 | 12°C (54°F) | 8°C (46°F) | 0 mm |
| 1977 | 12°C (54°F) | 8°C (46°F) | 1 mm |
| 1976 | 14°C (58°F) | 9°C (49°F) | 8 mm |
| 1975 | 23°C (74°F) | 13°C (55°F) | 0 mm |
| 1974 | 18°C (65°F) | 11°C (52°F) | 2 mm |
| 1973 | 26°C (78°F) | 13°C (56°F) | 21 mm |
| 1972 | 18°C (65°F) | 9°C (48°F) | 1 mm |
| 1971 | 20°C (68°F) | 6°C (43°F) | 0 mm |