July is one of the warmer months of the year in Ottawa, with average highs near 25.4°C and lows around 14.9°C (mean 20.2°C). It is a relatively wet time of year, averaging 96 mm of rainfall and 79% relative humidity across the period.
July is one of the warmer months of the year in Ottawa. Across 45 years of records, the warmest July in Ottawa was 2020 — when the month averaged 23°C — while the coldest was 1992 at 17.1°C. Typical July days reach 25.4°C with nights near 14.9°C. The long-term trend is warming, about 0.4°C per decade.
July is a relatively wet time of year in Ottawa, averaging 96 mm of rainfall. The wettest July on record was 2009 with 202 mm, while the driest was 2001 at 45 mm.
Relative humidity in Ottawa during July averages 79%. The most humid July was 2009 at 84%, and the least humid was 2012 at 67%.
July receives about 5.8 kWh/m²/day of solar energy in Ottawa. The sunniest Julys were 1989 and 2018 at 6.6 kWh/m²/day, and the cloudiest was 2009 at 4.9.
Average wind speed in Ottawa during July is 0.3 m/s. The windiest Julys were 2023, 2024 and 2025, among others at 0.3 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.7°C | 19.6°C | 19.6°C | 20.7°C | 21.4°C | +1.7°C |
| Avg High | 25.1°C | 24.8°C | 24.5°C | 26.2°C | 26.8°C | +1.7°C |
| Avg Low | 14.3°C | 14.5°C | 14.6°C | 15.3°C | 15.9°C | +1.6°C |
| Avg Rain | 85 mm | 99 mm | 111 mm | 88 mm | 98 mm | +12 mm |
July temperatures in Ottawa have risen by about 1.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 5.7°C (1982) to a record high of 36°C (2018).
Rainfall in July is a relatively wet time of year, averaging 96 mm, with a wettest year of 202 mm.
One of the best times to visit Ottawa
July is one of the best times to visit Ottawa. Expect days averaging 25.4°C and nights around 14.9°C (mean 20.2°C) — warmer than Ottawa's yearly average — with higher rainfall (96 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.2°C | 22.2°C | 16.1°C | 33.8°C | 9.2°C | 59 mm | 73% | 0.3 m/s | 5.9 |
| 2024 | 27.0°C | 21.7°C | 16.3°C | 35.2°C | 10.1°C | 125 mm | 78% | 0.3 m/s | 5.8 |
| 2023 | 26.7°C | 21.5°C | 16.3°C | 31.7°C | 9.7°C | 134 mm | 79% | 0.3 m/s | 5.3 |
| 2022 | 26.1°C | 20.4°C | 14.6°C | 31.4°C | 8.6°C | 74 mm | 74% | 0.3 m/s | 6.1 |
| 2021 | 24.3°C | 19.4°C | 14.4°C | 30.1°C | 9.9°C | 112 mm | 77% | 0.3 m/s | 5.3 |
| 2020 🔥 | 28.2°C | 23.0°C | 17.7°C | 35.2°C | 14.0°C | 81 mm | 78% | 0.3 m/s | 6 |
| 2019 | 26.8°C | 21.5°C | 16.2°C | 31.6°C | 11.2°C | 58 mm | 79% | 0.3 m/s | 6.4 |
| 2018 | 27.0°C | 21.6°C | 16.3°C | 36.0°C | 10.4°C | 120 mm | 79% | 0.3 m/s | 6.6 |
| 2017 | 24.1°C | 19.5°C | 14.8°C | 28.2°C | 10.9°C | 189 mm | 82% | 0.3 m/s | 5.7 |
| 2016 | 26.6°C | 20.8°C | 15.0°C | 30.9°C | 11.5°C | 69 mm | 75% | 0.3 m/s | 5.9 |
| 2015 | 26.2°C | 20.1°C | 14.1°C | 32.6°C | 8.6°C | 77 mm | 75% | 0.3 m/s | 6 |
| 2014 | 23.9°C | 18.8°C | 13.7°C | 29.2°C | 10.6°C | 99 mm | 79% | 0.3 m/s | 5.4 |
| 2013 | 26.0°C | 20.6°C | 15.3°C | 32.4°C | 8.7°C | 68 mm | 79% | 0.3 m/s | 6 |
| 2012 | 28.0°C | 21.7°C | 15.4°C | 34.6°C | 10.8°C | 46 mm | 67% | 0.3 m/s | 6.5 |
| 2011 | 26.1°C | 21.1°C | 16.1°C | 32.1°C | 12.4°C | 70 mm | 79% | 0.3 m/s | 6.5 |
| 2010 | 27.1°C | 21.7°C | 16.4°C | 35.0°C | 9.6°C | 83 mm | 77% | 0.3 m/s | 6 |
| 2009 🌧️ | 22.6°C | 18.4°C | 14.2°C | 26.6°C | 8.5°C | 202 mm | 84% | 0.3 m/s | 4.9 |
| 2008 | 24.5°C | 19.7°C | 14.8°C | 28.3°C | 9.9°C | 109 mm | 82% | 0.3 m/s | 5.3 |
| 2007 | 24.1°C | 19.0°C | 13.9°C | 28.1°C | 8.1°C | 139 mm | 81% | 0.3 m/s | 5.6 |
| 2006 | 26.4°C | 21.2°C | 15.9°C | 31.5°C | 11.2°C | 111 mm | 81% | 0.3 m/s | 5.8 |
| 2005 | 26.1°C | 20.9°C | 15.6°C | 32.2°C | 10.8°C | 93 mm | 80% | 0.3 m/s | 6.1 |
| 2004 | 24.6°C | 19.8°C | 15.0°C | 29.4°C | 9.0°C | 127 mm | 83% | 0.3 m/s | 5.3 |
| 2003 | 24.8°C | 19.8°C | 14.7°C | 29.0°C | 11.3°C | 110 mm | 81% | 0.3 m/s | 5.4 |
| 2002 | 25.6°C | 20.4°C | 15.3°C | 31.1°C | 10.1°C | 69 mm | 79% | 0.3 m/s | 6.3 |
| 2001 | 23.9°C | 18.6°C | 13.4°C | 31.1°C | 7.7°C | 45 mm | 76% | 0.3 m/s | 5.9 |
| 2000 | 22.7°C | 18.2°C | 13.6°C | 28.0°C | 9.1°C | 101 mm | 81% | 0.3 m/s | 5.5 |
| 1999 | 27.1°C | 21.5°C | 15.9°C | 31.7°C | 10.7°C | 118 mm | 76% | 0.3 m/s | 6 |
| 1998 | 25.0°C | 19.7°C | 14.5°C | 32.7°C | 9.8°C | 86 mm | 78% | 0.3 m/s | 5.9 |
| 1997 | 24.9°C | 19.4°C | 13.9°C | 31.1°C | 9.5°C | 77 mm | 77% | 0.3 m/s | 6 |
| 1996 | 23.2°C | 18.4°C | 13.7°C | 27.3°C | 10.0°C | 124 mm | 82% | 0.3 m/s | 5.2 |
| 1995 | 25.9°C | 20.4°C | 14.8°C | 31.1°C | 8.7°C | 106 mm | 79% | 0.3 m/s | 5.4 |
| 1994 | 25.1°C | 20.1°C | 15.1°C | 28.8°C | 9.3°C | 98 mm | 83% | 0.3 m/s | 5.6 |
| 1993 | 25.1°C | 20.3°C | 15.5°C | 31.7°C | 10.3°C | 62 mm | 81% | 0.3 m/s | 5.7 |
| 1992 ❄️ | 21.9°C | 17.1°C | 12.2°C | 25.3°C | 6.7°C | 158 mm | 80% | 0.3 m/s | 5.9 |
| 1991 | 25.0°C | 19.7°C | 14.4°C | 31.3°C | 9.3°C | 64 mm | 77% | 0.3 m/s | 6.1 |
| 1990 | 24.8°C | 19.8°C | 14.7°C | 29.7°C | 8.2°C | 101 mm | 78% | 0.3 m/s | 5.9 |
| 1989 | 26.1°C | 20.1°C | 14.1°C | 35.5°C | 10.4°C | 57 mm | 76% | 0.3 m/s | 6.6 |
| 1988 | 27.0°C | 21.2°C | 15.4°C | 34.4°C | 8.7°C | 91 mm | 78% | 0.3 m/s | 5.6 |
| 1987 | 25.9°C | 20.5°C | 15.2°C | 30.6°C | 8.4°C | 123 mm | 79% | 0.3 m/s | 5.6 |
| 1986 | 23.8°C | 18.7°C | 13.5°C | 29.2°C | 8.2°C | 145 mm | 81% | 0.3 m/s | 5.7 |
| 1985 | 23.5°C | 18.4°C | 13.3°C | 27.5°C | 8.1°C | 90 mm | 79% | 0.3 m/s | 6.1 |
| 1984 | 24.2°C | 19.3°C | 14.3°C | 28.4°C | 10.0°C | 64 mm | 80% | 0.3 m/s | 5.1 |
| 1983 | 25.4°C | 20.1°C | 14.8°C | 29.7°C | 8.3°C | 75 mm | 80% | 0.3 m/s | — |
| 1982 | 24.9°C | 19.1°C | 13.4°C | 28.9°C | 5.7°C | 58 mm | 78% | 0.3 m/s | — |
| 1981 | 24.8°C | 19.8°C | 14.7°C | 30.2°C | 8.6°C | 67 mm | 81% | 0.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 25.4°C with lows near 14.9°C (mean 20.2°C), based on 45 years of NASA POWER data.
July averages 96 mm of rainfall in Ottawa, a relatively wet time of year. The wettest on record was 202 mm in 2009.
The hottest July reached 36°C in 2018. The coldest dipped to 5.7°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.7°C. Daytime highs moved from 24.6°C to 26.5°C and overnight lows from 14.1°C to 15.5°C over the same span.
July is one of the warmer months of the year in Ottawa and a relatively wet time of year, so plan for around 25.4°C daytime highs and 14.9°C at night.
Not quite — July is the 12th coolest month in Ottawa, averaging 20.2°C.
For July in Ottawa, pack light layers you can adjust through the day, with typical highs of 25.4°C and lows of 14.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 79% — quite humid.
Average wind speed in July is 0.3 m/s. The windiest July on record averaged 0.3 m/s (1981).
The wettest July on record was 2009 with 202 mm. On average, July sees 96 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Ottawa behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
