Weather on September 21 in Perth
Historical weather data for September 21 in Perth, Australia
Based on 53 years of data from PERTH REGIONAL OFFICE
About This Date
September 21st in Perth, Australia typically brings mild fall weather, with average highs around 21°C and lows near 11°C. Over 53 years of records, the warmest September 21st was in 1983 (22°C average), while the coldest was 1972 (12°C) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 49% of September 21st dates historically, with the wettest September 21st recording 1.36" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Perth? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 27°C (81°F) | 10°C (50°F) | 1 mm |
| 2024 | 20°C (68°F) | 8°C (46°F) | 0 mm |
| 2023 | 25°C (77°F) | 9°C (49°F) | 0 mm |
| 2022 | 21°C (70°F) | 9°C (49°F) | 1 mm |
| 2021 | 26°C (79°F) | 13°C (55°F) | 0 mm |
| 2020 | 18°C (65°F) | 11°C (52°F) | 9 mm |
| 2019 | 19°C (66°F) | 6°C (42°F) | 0 mm |
| 2018 | 25°C (77°F) | 9°C (48°F) | 0 mm |
| 2017 | 22°C (71°F) | 17°C (63°F) | 10 mm |
| 2016 | 23°C (74°F) | 5°C (41°F) | 0 mm |
| 2015 | 23°C (74°F) | 9°C (49°F) | 0 mm |
| 2014 | 22°C (71°F) | 16°C (61°F) | 0 mm |
| 2013 | 22°C (71°F) | 9°C (49°F) | 5 mm |
| 2012 | 22°C (71°F) | 13°C (55°F) | 3 mm |
| 2011 | 20°C (68°F) | 12°C (54°F) | 3 mm |
| 2010 | 26°C (78°F) | 7°C (45°F) | 0 mm |
| 2009 | 18°C (64°F) | 13°C (55°F) | 7 mm |
| 2008 | 17°C (63°F) | 13°C (55°F) | 9 mm |
| 2007 | 22°C (71°F) | 8°C (47°F) | 0 mm |
| 2006 | 21°C (69°F) | 14°C (58°F) | 12 mm |
| 2005 | 17°C (62°F) | 12°C (54°F) | 14 mm |
| 2004 | 16°C (61°F) | 10°C (50°F) | 6 mm |
| 2003 | 19°C (67°F) | 12°C (53°F) | 1 mm |
| 2002 | 19°C (66°F) | 13°C (55°F) | 0 mm |
| 2001 | 22°C (71°F) | 8°C (47°F) | 0 mm |
| 2000 | 23°C (74°F) | 7°C (45°F) | 0 mm |
| 1999 | 17°C (62°F) | 13°C (56°F) | 8 mm |
| 1998 | 16°C (60°F) | 8°C (47°F) | 29 mm |
| 1997 | 22°C (71°F) | 13°C (55°F) | 0 mm |
| 1996 | 22°C (72°F) | 8°C (46°F) | 0 mm |
| 1995 | 19°C (67°F) | 6°C (43°F) | 0 mm |
| 1994 | 19°C (67°F) | 13°C (56°F) | 0 mm |
| 1991 | 20°C (68°F) | 9°C (49°F) | 0 mm |
| 1990 | 19°C (67°F) | 7°C (44°F) | 0 mm |
| 1989 | 21°C (69°F) | 13°C (56°F) | 18 mm |
| 1988 | 20°C (68°F) | 13°C (56°F) | 18 mm |
| 1987 | 23°C (73°F) | 11°C (52°F) | 0 mm |
| 1986 | 19°C (67°F) | 11°C (52°F) | 4 mm |
| 1985 | 18°C (64°F) | 15°C (59°F) | 6 mm |
| 1984 | 22°C (71°F) | 9°C (48°F) | 0 mm |
| 1983 | 29°C (84°F) | 15°C (59°F) | 0 mm |
| 1982 | 19°C (67°F) | 15°C (59°F) | 24 mm |
| 1981 | 17°C (63°F) | 9°C (49°F) | 0 mm |
| 1980 | 19°C (67°F) | 14°C (57°F) | 2 mm |
| 1979 | 19°C (67°F) | 13°C (56°F) | 35 mm |
| 1978 | 19°C (66°F) | 11°C (51°F) | 6 mm |
| 1977 | 18°C (64°F) | 17°C (62°F) | 0 mm |
| 1976 | 24°C (75°F) | 11°C (51°F) | 0 mm |
| 1975 | 18°C (64°F) | 13°C (56°F) | 6 mm |
| 1974 | 20°C (68°F) | 11°C (51°F) | 0 mm |
| 1973 | 21°C (70°F) | 9°C (48°F) | 0 mm |
| 1972 | 18°C (64°F) | 6°C (43°F) | 5 mm |
| 1971 | 20°C (68°F) | 13°C (56°F) | 9 mm |