Weather on August 15 in Ottawa
Historical weather data for August 15 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA
About This Date
August 15th in Ottawa, Canada typically brings pleasant summer weather, with average highs around 26°C and lows near 14°C. Over 54 years of records, the warmest August 15th was in 1978 (26°C average), while the coldest was 1979 (13°C) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 37% of August 15th dates historically, with the wettest August 15th recording 4.37" of rain. The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
Planning for August 15th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 28°C (82°F) | 12°C (53°F) | -- |
| 2023 | 24°C (75°F) | 14°C (57°F) | 0" |
| 2022 | 28°C (83°F) | 12°C (53°F) | 0" |
| 2021 | 24°C (76°F) | 9°C (49°F) | 0" |
| 2020 | 28°C (82°F) | 16°C (60°F) | 0" |
| 2019 | 24°C (76°F) | 8°C (46°F) | 0" |
| 2018 | 25°C (77°F) | 18°C (65°F) | 0.09" |
| 2017 | 26°C (79°F) | 18°C (64°F) | 0" |
| 2016 | 28°C (82°F) | 16°C (60°F) | 0" |
| 2015 | 28°C (83°F) | 19°C (66°F) | 0.02" |
| 2014 | 17°C (62°F) | 12°C (53°F) | 0.12" |
| 2013 | 24°C (76°F) | 12°C (53°F) | 0" |
| 2012 | 26°C (79°F) | -- | -- |
| 2011 | 24°C (76°F) | 17°C (63°F) | 0.07" |
| 2010 | 23°C (74°F) | 18°C (64°F) | 4.37" |
| 2009 | 31°C (87°F) | 17°C (63°F) | 0" |
| 2008 | 26°C (78°F) | 12°C (54°F) | 0.06" |
| 2007 | 24°C (75°F) | 13°C (55°F) | 0.11" |
| 2006 | 26°C (78°F) | 16°C (61°F) | 0" |
| 2005 | 28°C (82°F) | 14°C (57°F) | 0" |
| 2004 | 24°C (76°F) | 12°C (54°F) | 0" |
| 2003 | 31°C (87°F) | 17°C (63°F) | 0" |
| 2002 | 28°C (83°F) | 22°C (71°F) | 0.82" |
| 2001 | 30°C (86°F) | 10°C (50°F) | 0" |
| 2000 | 28°C (82°F) | 15°C (59°F) | 0" |
| 1999 | 25°C (77°F) | 12°C (54°F) | 0" |
| 1998 | 31°C (87°F) | 17°C (62°F) | 0.67" |
| 1997 | 25°C (77°F) | 13°C (55°F) | 0.58" |
| 1996 | 28°C (83°F) | 13°C (55°F) | 0.32" |
| 1995 | 32°C (90°F) | 19°C (66°F) | 0" |
| 1994 | 18°C (64°F) | 9°C (49°F) | 0" |
| 1993 | 28°C (83°F) | 14°C (58°F) | 0" |
| 1992 | 23°C (73°F) | 9°C (48°F) | 0" |
| 1991 | 31°C (87°F) | 16°C (61°F) | 0" |
| 1990 | 22°C (71°F) | 14°C (57°F) | 0.58" |
| 1989 | 29°C (85°F) | 16°C (61°F) | 0.32" |
| 1988 | 25°C (77°F) | 21°C (70°F) | 0.03" |
| 1987 | 27°C (80°F) | 20°C (68°F) | 0" |
| 1986 | 26°C (79°F) | 17°C (63°F) | 0.04" |
| 1985 | 23°C (73°F) | 17°C (63°F) | 0.55" |
| 1984 | 28°C (83°F) | 18°C (65°F) | 0" |
| 1983 | 28°C (83°F) | 14°C (58°F) | 0" |
| 1982 | 29°C (84°F) | 13°C (55°F) | 0" |
| 1981 | 18°C (64°F) | 15°C (59°F) | 1.7" |
| 1980 | 21°C (70°F) | 16°C (61°F) | 0.04" |
| 1979 | 15°C (59°F) | 12°C (53°F) | 0.04" |
| 1978 | 33°C (91°F) | 19°C (67°F) | 0" |
| 1977 | 23°C (73°F) | 11°C (52°F) | 0" |
| 1976 | 21°C (69°F) | 15°C (59°F) | 0.79" |
| 1975 | 28°C (82°F) | 12°C (53°F) | 0" |
| 1974 | 24°C (75°F) | 11°C (52°F) | 0" |
| 1973 | 24°C (76°F) | 17°C (62°F) | 0" |
| 1972 | 22°C (72°F) | 10°C (50°F) | 0" |
| 1971 | 21°C (70°F) | 12°C (53°F) | 0" |