June is one of the warmer months of the year in Ottawa, with average highs near 22.8°C and lows around 12°C (mean 17.4°C). It is a relatively wet time of year, averaging 99 mm of rainfall and 78% relative humidity across the period.
June is one of the warmer months of the year in Ottawa. Across 45 years of records, the warmest June in Ottawa was 2005 — when the month averaged 20.4°C — while the coldest was 1985 at 14.8°C. Typical June days reach 22.8°C with nights near 12°C. The long-term trend is warming, about 0.4°C per decade.
June is a relatively wet time of year in Ottawa, averaging 99 mm of rainfall. The wettest June on record was 2002 with 192 mm, while the driest was 1991 at 23 mm.
Relative humidity in Ottawa during June averages 78%. The most humid June was 2008 at 83%, and the least humid was 1988 at 73%.
June receives about 5.8 kWh/m²/day of solar energy in Ottawa. The sunniest June was 1995 at 6.7 kWh/m²/day, and the cloudiest were 1990 and 1996 at 5.
Average wind speed in Ottawa during June is 0.3 m/s. The windiest Junes 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 | 16.4°C | 17.6°C | 17.5°C | 17.3°C | 18.4°C | +2°C |
| Avg High | 21.9°C | 23.1°C | 22.9°C | 22.6°C | 23.8°C | +1.9°C |
| Avg Low | 10.9°C | 12.1°C | 12.1°C | 12.0°C | 12.9°C | +2°C |
| Avg Rain | 94 mm | 91 mm | 106 mm | 107 mm | 94 mm | 0 mm |
June temperatures in Ottawa have risen by about 2°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 0.6°C (1986) to a record high of 34.8°C (1989).
Rainfall in June is a relatively wet time of year, averaging 99 mm, with a wettest year of 192 mm.
One of the best times to visit Ottawa
June is one of the best times to visit Ottawa. Expect days averaging 22.8°C and nights around 12°C (mean 17.4°C) — warmer than Ottawa's yearly average — with higher rainfall (99 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 | 24.5°C | 18.7°C | 12.8°C | 33.4°C | 4.7°C | 64 mm | 75% | 0.3 m/s | 6 |
| 2024 | 23.9°C | 18.6°C | 13.3°C | 31.1°C | 8.2°C | 144 mm | 78% | 0.3 m/s | 5.5 |
| 2023 | 23.2°C | 18.1°C | 13.0°C | 34.4°C | 6.2°C | 72 mm | 79% | 0.3 m/s | 5.3 |
| 2022 | 22.8°C | 17.5°C | 12.2°C | 29.1°C | 6.5°C | 100 mm | 78% | 0.3 m/s | 5.5 |
| 2021 | 24.7°C | 19.2°C | 13.8°C | 30.8°C | 8.4°C | 108 mm | 75% | 0.3 m/s | 5.9 |
| 2020 | 24.0°C | 18.2°C | 12.4°C | 32.4°C | 4.5°C | 76 mm | 76% | 0.3 m/s | 6.1 |
| 2019 | 21.9°C | 16.5°C | 11.2°C | 27.2°C | 3.4°C | 111 mm | 79% | 0.3 m/s | 5.9 |
| 2018 | 22.4°C | 16.9°C | 11.3°C | 29.2°C | 7.6°C | 85 mm | 79% | 0.3 m/s | 6.1 |
| 2017 | 22.0°C | 17.3°C | 12.5°C | 28.6°C | 6.7°C | 143 mm | 82% | 0.3 m/s | 5.3 |
| 2016 | 23.3°C | 17.5°C | 11.7°C | 31.1°C | 5.6°C | 67 mm | 74% | 0.3 m/s | 6.3 |
| 2015 | 21.9°C | 16.3°C | 10.6°C | 27.1°C | 5.0°C | 105 mm | 78% | 0.3 m/s | 5.7 |
| 2014 | 23.3°C | 18.0°C | 12.6°C | 31.0°C | 7.8°C | 123 mm | 78% | 0.3 m/s | 5.9 |
| 2013 | 21.6°C | 16.7°C | 11.8°C | 28.5°C | 5.4°C | 147 mm | 81% | 0.3 m/s | 5.1 |
| 2012 | 24.0°C | 18.6°C | 13.2°C | 32.7°C | 8.5°C | 70 mm | 76% | 0.3 m/s | 6.1 |
| 2011 | 23.5°C | 17.9°C | 12.4°C | 28.6°C | 6.1°C | 95 mm | 79% | 0.3 m/s | 5.7 |
| 2010 | 22.4°C | 17.4°C | 12.4°C | 27.6°C | 7.5°C | 128 mm | 79% | 0.3 m/s | 5.1 |
| 2009 | 22.3°C | 16.8°C | 11.3°C | 31.7°C | 1.0°C | 73 mm | 78% | 0.3 m/s | 5.7 |
| 2008 | 23.4°C | 18.5°C | 13.6°C | 29.2°C | 8.0°C | 114 mm | 83% | 0.3 m/s | 5.4 |
| 2007 | 23.6°C | 17.8°C | 12.0°C | 30.3°C | 3.7°C | 67 mm | 78% | 0.3 m/s | 6.2 |
| 2006 | 23.1°C | 17.9°C | 12.8°C | 29.2°C | 5.6°C | 111 mm | 79% | 0.3 m/s | 5.4 |
| 2005 🔥 | 25.8°C | 20.4°C | 15.1°C | 33.4°C | 9.0°C | 99 mm | 80% | 0.3 m/s | 5.7 |
| 2004 | 21.7°C | 15.9°C | 10.1°C | 28.1°C | 4.2°C | 82 mm | 77% | 0.3 m/s | 6.5 |
| 2003 | 22.9°C | 17.2°C | 11.5°C | 30.0°C | 5.2°C | 83 mm | 77% | 0.3 m/s | 6.3 |
| 2002 🌧️ | 21.7°C | 16.4°C | 11.2°C | 27.6°C | 3.4°C | 192 mm | 79% | 0.3 m/s | 5.4 |
| 2001 | 23.9°C | 18.4°C | 12.9°C | 29.9°C | 4.7°C | 107 mm | 79% | 0.3 m/s | 6 |
| 2000 | 21.0°C | 15.9°C | 10.9°C | 26.1°C | 3.8°C | 132 mm | 80% | 0.3 m/s | 5.1 |
| 1999 | 24.8°C | 19.1°C | 13.4°C | 30.9°C | 6.1°C | 85 mm | 76% | 0.3 m/s | 5.8 |
| 1998 | 23.1°C | 18.3°C | 13.4°C | 31.6°C | 4.8°C | 151 mm | 79% | 0.3 m/s | 5.1 |
| 1997 | 24.1°C | 18.2°C | 12.2°C | 30.4°C | 6.5°C | 61 mm | 77% | 0.3 m/s | 6.6 |
| 1996 | 22.4°C | 17.4°C | 12.4°C | 28.8°C | 6.8°C | 87 mm | 82% | 0.3 m/s | 5 |
| 1995 | 24.5°C | 18.3°C | 12.2°C | 31.3°C | 6.7°C | 88 mm | 75% | 0.3 m/s | 6.7 |
| 1994 | 23.7°C | 18.2°C | 12.7°C | 33.3°C | 5.5°C | 149 mm | 79% | 0.3 m/s | 5.6 |
| 1993 | 21.4°C | 16.0°C | 10.7°C | 26.9°C | 4.3°C | 110 mm | 80% | 0.3 m/s | 5.6 |
| 1992 | 21.2°C | 15.8°C | 10.4°C | 27.0°C | 5.4°C | 69 mm | 77% | 0.3 m/s | 6 |
| 1991 | 23.4°C | 17.6°C | 11.8°C | 29.0°C | 6.7°C | 23 mm | 76% | 0.3 m/s | 6.5 |
| 1990 | 22.2°C | 17.2°C | 12.1°C | 29.1°C | 4.4°C | 88 mm | 81% | 0.3 m/s | 5 |
| 1989 | 22.9°C | 17.7°C | 12.4°C | 34.8°C | 6.9°C | 90 mm | 80% | 0.3 m/s | 5.6 |
| 1988 | 21.4°C | 15.4°C | 9.5°C | 29.8°C | 4.0°C | 86 mm | 73% | 0.3 m/s | 6.5 |
| 1987 | 22.9°C | 17.6°C | 12.4°C | 28.6°C | 4.7°C | 96 mm | 79% | 0.3 m/s | 5.9 |
| 1986 | 20.8°C | 14.9°C | 9.0°C | 26.2°C | 0.6°C | 117 mm | 77% | 0.3 m/s | 6.1 |
| 1985 ❄️ | 20.0°C | 14.8°C | 9.6°C | 24.9°C | 5.0°C | 107 mm | 79% | 0.3 m/s | 5.4 |
| 1984 | 23.0°C | 17.1°C | 11.3°C | 28.6°C | 5.5°C | 69 mm | 78% | 0.3 m/s | 5.8 |
| 1983 | 23.3°C | 17.6°C | 11.9°C | 32.0°C | 2.4°C | 52 mm | 77% | 0.3 m/s | — |
| 1982 | 20.6°C | 15.6°C | 10.7°C | 25.8°C | 5.0°C | 101 mm | 78% | 0.3 m/s | — |
| 1981 | 22.3°C | 16.8°C | 11.4°C | 28.8°C | 4.8°C | 130 mm | 81% | 0.3 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 22.8°C with lows near 12°C (mean 17.4°C), based on 45 years of NASA POWER data.
June averages 99 mm of rainfall in Ottawa, a relatively wet time of year. The wettest on record was 192 mm in 2002.
The hottest June reached 34.8°C in 1989. The coldest dipped to 0.6°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2°C. Daytime highs moved from 21.8°C to 23.8°C and overnight lows from 11°C to 13°C over the same span.
June is one of the warmer months of the year in Ottawa and a relatively wet time of year, so plan for around 22.8°C daytime highs and 12°C at night.
Not quite — June is the 10th coolest month in Ottawa, averaging 17.4°C.
For June in Ottawa, pack light layers you can adjust through the day, with typical highs of 22.8°C and lows of 12°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 78% — quite humid.
Average wind speed in June is 0.3 m/s. The windiest June on record averaged 0.3 m/s (1981).
The wettest June on record was 2002 with 192 mm. On average, June sees 99 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
