Weather on September 30 in Ottawa
Historical weather data for September 30 in Ottawa, Canada
Based on 55 years of data from OTTAWA CDA RCS
About This Date
September 30th in Ottawa, Canada typically brings mild fall weather, with average highs around 17°C and lows near 7°C. Over 55 years of records, the warmest September 30th was in 1986 (21°C average), while the coldest was 1991 (4°C) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 40% of September 30th dates historically, with the wettest September 30th recording 1.87" of rain. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for September 30th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 21°C (70°F) | 14°C (58°F) | -- |
| 2024 | 24°C (75°F) | 11°C (51°F) | 0 mm |
| 2023 | 24°C (75°F) | 10°C (50°F) | 0 mm |
| 2022 | 19°C (66°F) | 2°C (35°F) | 0 mm |
| 2021 | 17°C (62°F) | 7°C (44°F) | 0 mm |
| 2020 | 17°C (62°F) | 11°C (51°F) | 35 mm |
| 2019 | 16°C (60°F) | 7°C (44°F) | 8 mm |
| 2018 | 11°C (52°F) | 6°C (42°F) | 1 mm |
| 2017 | 14°C (58°F) | 8°C (46°F) | 0 mm |
| 2016 | 18°C (65°F) | 11°C (52°F) | 0 mm |
| 2015 | 15°C (59°F) | 6°C (43°F) | 0 mm |
| 2014 | 17°C (62°F) | 8°C (47°F) | 0 mm |
| 2013 | 24°C (75°F) | 8°C (47°F) | 0 mm |
| 2012 | 13°C (56°F) | 10°C (50°F) | 47 mm |
| 2011 | 20°C (68°F) | 8°C (47°F) | 11 mm |
| 2010 | 16°C (60°F) | 11°C (52°F) | 39 mm |
| 2009 | 9°C (48°F) | 4°C (39°F) | 0 mm |
| 2008 | 17°C (62°F) | 10°C (50°F) | 21 mm |
| 2007 | 18°C (64°F) | 7°C (44°F) | 0 mm |
| 2006 | 16°C (61°F) | 0°C (32°F) | 0 mm |
| 2005 | 15°C (59°F) | 2°C (36°F) | 1 mm |
| 2004 | 18°C (65°F) | 4°C (39°F) | 0 mm |
| 2003 | 16°C (60°F) | 4°C (40°F) | 5 mm |
| 2002 | 19°C (66°F) | 8°C (46°F) | 36 mm |
| 2001 | 19°C (66°F) | 3°C (38°F) | 0 mm |
| 2000 | 20°C (68°F) | 3°C (38°F) | 0 mm |
| 1999 | 12°C (54°F) | 10°C (50°F) | 4 mm |
| 1998 | 19°C (67°F) | 13°C (56°F) | 27 mm |
| 1997 | 16°C (61°F) | 12°C (53°F) | 4 mm |
| 1996 | 13°C (56°F) | 6°C (42°F) | 0 mm |
| 1995 | 22°C (72°F) | 4°C (40°F) | 0 mm |
| 1994 | 12°C (54°F) | 6°C (42°F) | 0 mm |
| 1993 | 9°C (48°F) | 3°C (38°F) | 0 mm |
| 1992 | 7°C (44°F) | 1°C (34°F) | 0 mm |
| 1991 | 10°C (50°F) | -2°C (28°F) | 8 mm |
| 1990 | 11°C (52°F) | 9°C (49°F) | 17 mm |
| 1989 | 17°C (62°F) | 1°C (34°F) | 0 mm |
| 1988 | 22°C (71°F) | 6°C (42°F) | 0 mm |
| 1987 | 17°C (62°F) | 11°C (51°F) | 15 mm |
| 1986 | 24°C (75°F) | 17°C (63°F) | 1 mm |
| 1985 | 23°C (74°F) | 8°C (46°F) | 46 mm |
| 1984 | 14°C (58°F) | 1°C (34°F) | 0 mm |
| 1983 | 25°C (77°F) | 6°C (42°F) | 0 mm |
| 1982 | 23°C (73°F) | 9°C (48°F) | 0 mm |
| 1981 | 10°C (50°F) | -1°C (31°F) | 0 mm |
| 1980 | 19°C (66°F) | 11°C (52°F) | 1 mm |
| 1979 | 22°C (71°F) | 12°C (53°F) | 0 mm |
| 1978 | 19°C (66°F) | 8°C (46°F) | 25 mm |
| 1977 | 11°C (51°F) | 8°C (46°F) | 15 mm |
| 1976 | 14°C (58°F) | 6°C (43°F) | 0 mm |
| 1975 | 21°C (70°F) | 7°C (45°F) | 0 mm |
| 1974 | 11°C (52°F) | 5°C (41°F) | 0 mm |
| 1973 | 17°C (62°F) | 4°C (40°F) | 0 mm |
| 1972 | 7°C (45°F) | 4°C (39°F) | 26 mm |
| 1971 | 20°C (68°F) | 10°C (50°F) | 0 mm |