Weather on August 18 in Ottawa
Historical weather data for August 18 in Ottawa, Canada
Based on 54 years of data from OTTAWA CDA
About This Date
August 18th in Ottawa, Canada typically brings pleasant summer weather, with average highs around 25°C and lows near 14°C. Over 54 years of records, the warmest August 18th was in 2002 (27°C average), while the coldest was 1977 (15°C) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 37% of August 18th dates historically, with the wettest August 18th recording 2.12" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for August 18th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 23°C (74°F) | 11°C (51°F) | 0 mm |
| 2023 | 23°C (73°F) | 14°C (57°F) | 8 mm |
| 2022 | 27°C (81°F) | 17°C (63°F) | 0 mm |
| 2021 | 30°C (86°F) | 21°C (70°F) | 0 mm |
| 2020 | 22°C (72°F) | 14°C (57°F) | 7 mm |
| 2019 | 27°C (81°F) | 16°C (60°F) | 6 mm |
| 2018 | 25°C (77°F) | 16°C (60°F) | 0 mm |
| 2017 | 23°C (73°F) | 16°C (61°F) | 9 mm |
| 2016 | 27°C (81°F) | 14°C (58°F) | 1 mm |
| 2015 | 32°C (89°F) | 19°C (67°F) | 0 mm |
| 2014 | 21°C (70°F) | 10°C (50°F) | 0 mm |
| 2013 | 28°C (82°F) | 13°C (55°F) | 0 mm |
| 2012 | 22°C (72°F) | 13°C (55°F) | 0 mm |
| 2011 | 29°C (84°F) | 17°C (62°F) | 25 mm |
| 2010 | 24°C (75°F) | 13°C (56°F) | 0 mm |
| 2009 | 28°C (83°F) | 19°C (67°F) | 3 mm |
| 2008 | 29°C (85°F) | 14°C (58°F) | 42 mm |
| 2007 | 18°C (65°F) | 11°C (52°F) | 0 mm |
| 2006 | 29°C (85°F) | 14°C (58°F) | 0 mm |
| 2005 | 20°C (68°F) | 9°C (49°F) | 0 mm |
| 2004 | 26°C (79°F) | 17°C (63°F) | 14 mm |
| 2003 | 27°C (81°F) | 16°C (60°F) | 0 mm |
| 2002 | 31°C (88°F) | 23°C (73°F) | 0 mm |
| 2001 | 27°C (81°F) | 18°C (65°F) | 0 mm |
| 2000 | 21°C (70°F) | 9°C (48°F) | 0 mm |
| 1999 | 25°C (77°F) | 17°C (63°F) | 0 mm |
| 1998 | 17°C (63°F) | 13°C (55°F) | 0 mm |
| 1997 | 23°C (73°F) | 11°C (51°F) | 0 mm |
| 1996 | 26°C (79°F) | 17°C (62°F) | 1 mm |
| 1995 | 29°C (84°F) | 20°C (68°F) | 0 mm |
| 1994 | 26°C (79°F) | 14°C (58°F) | 0 mm |
| 1993 | 27°C (80°F) | 18°C (64°F) | 0 mm |
| 1992 | 24°C (76°F) | 12°C (53°F) | 1 mm |
| 1991 | 24°C (75°F) | 18°C (64°F) | 0 mm |
| 1990 | 29°C (85°F) | 20°C (68°F) | 54 mm |
| 1989 | 25°C (77°F) | 9°C (48°F) | 0 mm |
| 1988 | 19°C (67°F) | 11°C (52°F) | 0 mm |
| 1987 | 26°C (79°F) | 18°C (64°F) | 0 mm |
| 1986 | 26°C (78°F) | 18°C (64°F) | 0 mm |
| 1985 | 30°C (86°F) | 13°C (55°F) | 14 mm |
| 1984 | 23°C (73°F) | 8°C (46°F) | 2 mm |
| 1983 | 27°C (81°F) | 18°C (65°F) | 0 mm |
| 1982 | 26°C (79°F) | 9°C (48°F) | 0 mm |
| 1981 | 24°C (76°F) | 8°C (46°F) | 0 mm |
| 1980 | 26°C (79°F) | 14°C (57°F) | 1 mm |
| 1979 | 17°C (63°F) | 13°C (56°F) | 21 mm |
| 1978 | 26°C (78°F) | 17°C (62°F) | 1 mm |
| 1977 | 18°C (64°F) | 12°C (54°F) | 1 mm |
| 1976 | 26°C (78°F) | 9°C (49°F) | 0 mm |
| 1975 | 24°C (75°F) | 14°C (58°F) | 0 mm |
| 1974 | 28°C (82°F) | 16°C (60°F) | 16 mm |
| 1973 | 29°C (85°F) | 19°C (66°F) | 14 mm |
| 1972 | 23°C (73°F) | 16°C (60°F) | 0 mm |
| 1971 | 28°C (83°F) | 14°C (57°F) | 0 mm |