June is one of the warmer months of the year in St. Catharines, with average highs near 22.6°C and lows around 13.9°C (mean 18.3°C). It is a relatively wet time of year, averaging 77 mm of rainfall and 73% relative humidity across the period.
June is one of the warmer months of the year in St. Catharines. Across 45 years of records, the warmest June in St. Catharines was 2005 — when the month averaged 21.7°C — while the coldest was 1982 at 15.4°C. Typical June days reach 22.6°C with nights near 13.9°C. The long-term trend is warming, about 0.6°C per decade.
June is a relatively wet time of year in St. Catharines, averaging 77 mm of rainfall. The wettest June on record was 2000 with 171 mm, while the driest was 1988 at 21 mm.
Relative humidity in St. Catharines during June averages 73%. The most humid June was 2000 at 81%, and the least humid was 1988 at 59%.
June receives about 6 kWh/m²/day of solar energy in St. Catharines. The sunniest June was 2020 at 7.2 kWh/m²/day, and the cloudiest was 1996 at 5.
Average wind speed in St. Catharines during June is 2.7 m/s. The windiest Junes were 2012, 2017 and 2021, among others at 3.2 m/s, while the calmest were 1996, 2001 and 2009, among others at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.2°C | 17.9°C | 18.2°C | 18.7°C | 19.9°C | +2.7°C |
| Avg High | 21.6°C | 22.6°C | 22.3°C | 22.7°C | 24.3°C | +2.7°C |
| Avg Low | 12.8°C | 13.2°C | 14.1°C | 14.6°C | 15.5°C | +2.7°C |
| Avg Rain | 85 mm | 63 mm | 78 mm | 96 mm | 54 mm | -30 mm |
June temperatures in St. Catharines have risen by about 2.9°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 4.4°C (1992) to a record high of 32.9°C (2005).
Rainfall in June is a relatively wet time of year, averaging 77 mm, with a wettest year of 171 mm.
One of the best times to visit St. Catharines
June is one of the best times to visit St. Catharines. Expect days averaging 22.6°C and nights around 13.9°C (mean 18.3°C) — warmer than St. Catharines's yearly average — with moderate rainfall (77 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 | 24.2°C | 19.9°C | 15.6°C | 30.4°C | 6.2°C | 49 mm | 73% | 2.9 m/s | 6 |
| 2024 | 24.9°C | 20.7°C | 16.5°C | 31.4°C | 11.1°C | 65 mm | 71% | 2.8 m/s | 5.6 |
| 2023 | 23.1°C | 18.9°C | 14.7°C | 29.1°C | 11.2°C | 67 mm | 70% | 2.5 m/s | 5.7 |
| 2022 | 24.1°C | 19.2°C | 14.3°C | 31.1°C | 9.1°C | 49 mm | 66% | 2.9 m/s | 6.5 |
| 2021 | 25.3°C | 20.9°C | 16.6°C | 30.4°C | 11.3°C | 51 mm | 67% | 3.2 m/s | 6.2 |
| 2020 | 24.5°C | 19.8°C | 15.1°C | 30.0°C | 8.7°C | 43 mm | 69% | 2.7 m/s | 7.2 |
| 2019 | 21.2°C | 17.1°C | 13.0°C | 27.6°C | 5.8°C | 106 mm | 76% | 2.6 m/s | 6.1 |
| 2018 | 22.9°C | 19.0°C | 15.0°C | 28.9°C | 9.8°C | 74 mm | 74% | 2.7 m/s | 6 |
| 2017 | 22.4°C | 18.7°C | 15.0°C | 27.3°C | 9.0°C | 89 mm | 77% | 3.2 m/s | 5.9 |
| 2016 | 24.4°C | 19.7°C | 15.1°C | 29.3°C | 8.1°C | 36 mm | 65% | 3 m/s | 6.9 |
| 2015 | 21.9°C | 17.7°C | 13.5°C | 25.6°C | 8.1°C | 142 mm | 78% | 2.7 m/s | 5.8 |
| 2014 | 23.2°C | 18.9°C | 14.7°C | 28.8°C | 9.1°C | 93 mm | 78% | 2.4 m/s | 6.1 |
| 2013 | 21.6°C | 18.0°C | 14.4°C | 27.8°C | 7.6°C | 122 mm | 79% | 2.6 m/s | 5.7 |
| 2012 | 24.4°C | 20.1°C | 15.8°C | 30.0°C | 9.7°C | 73 mm | 70% | 3.2 m/s | 6.2 |
| 2011 | 21.8°C | 18.0°C | 14.2°C | 25.9°C | 6.7°C | 91 mm | 80% | 2.6 m/s | 6.1 |
| 2010 | 23.1°C | 19.3°C | 15.5°C | 27.0°C | 8.9°C | 130 mm | 76% | 2.9 m/s | 5.6 |
| 2009 | 21.5°C | 17.4°C | 13.4°C | 28.9°C | 6.2°C | 94 mm | 75% | 2.3 m/s | 5.8 |
| 2008 | 22.6°C | 19.0°C | 15.3°C | 26.6°C | 9.3°C | 95 mm | 80% | 3.1 m/s | 5.6 |
| 2007 | 24.8°C | 20.0°C | 15.2°C | 30.0°C | 8.0°C | 38 mm | 66% | 2.7 m/s | 6.9 |
| 2006 | 23.3°C | 19.3°C | 15.3°C | 28.4°C | 8.6°C | 59 mm | 71% | 2.6 m/s | 5.9 |
| 2005 🔥 | 25.8°C | 21.7°C | 17.5°C | 32.9°C | 12.5°C | 49 mm | 73% | 2.5 m/s | 6.2 |
| 2004 | 20.9°C | 17.1°C | 13.2°C | 24.8°C | 7.5°C | 68 mm | 78% | 2.8 m/s | 6.1 |
| 2003 | 19.8°C | 15.5°C | 11.2°C | 26.0°C | 4.4°C | 66 mm | 80% | 2.6 m/s | 6 |
| 2002 | 21.1°C | 16.9°C | 12.8°C | 27.0°C | 5.5°C | 68 mm | 81% | 2.4 m/s | 5.7 |
| 2001 | 22.0°C | 17.5°C | 13.1°C | 28.9°C | 7.0°C | 66 mm | 75% | 2.3 m/s | 5.9 |
| 2000 🌧️ | 21.1°C | 17.4°C | 13.7°C | 25.5°C | 8.6°C | 171 mm | 81% | 3.2 m/s | 5.1 |
| 1999 | 24.0°C | 19.1°C | 14.2°C | 30.2°C | 7.8°C | 65 mm | 68% | 2.4 m/s | 6.1 |
| 1998 | 23.2°C | 18.9°C | 14.5°C | 29.7°C | 6.9°C | 72 mm | 72% | 2.7 m/s | 5.7 |
| 1997 | 23.3°C | 18.9°C | 14.5°C | 28.1°C | 10.3°C | 73 mm | 73% | 2.5 m/s | 6.3 |
| 1996 | 22.2°C | 17.7°C | 13.2°C | 28.2°C | 7.5°C | 86 mm | 79% | 2.3 m/s | 5 |
| 1995 | 23.8°C | 18.9°C | 14.0°C | 30.1°C | 8.1°C | 32 mm | 69% | 2.4 m/s | 6.2 |
| 1994 | 23.0°C | 17.9°C | 12.9°C | 31.9°C | 4.4°C | 80 mm | 71% | 2.6 m/s | 5.9 |
| 1993 | 20.8°C | 16.2°C | 11.5°C | 26.2°C | 5.7°C | 92 mm | 74% | 2.9 m/s | 5.9 |
| 1992 | 21.1°C | 16.1°C | 11.0°C | 26.4°C | 4.4°C | 42 mm | 67% | 2.3 m/s | 6.3 |
| 1991 | 23.6°C | 18.8°C | 14.0°C | 28.6°C | 8.1°C | 24 mm | 67% | 2.6 m/s | 6.6 |
| 1990 | 20.8°C | 16.4°C | 12.0°C | 27.7°C | 5.1°C | 65 mm | 76% | 3.1 m/s | 5.6 |
| 1989 | 21.4°C | 17.3°C | 13.1°C | 28.4°C | 9.2°C | 114 mm | 79% | 2.4 m/s | 5.4 |
| 1988 | 22.0°C | 16.6°C | 11.1°C | 29.2°C | 5.5°C | 21 mm | 59% | 3.1 m/s | 6.5 |
| 1987 | 24.1°C | 19.7°C | 15.3°C | 29.3°C | 8.6°C | 87 mm | 69% | 3.1 m/s | 6 |
| 1986 | 20.7°C | 16.3°C | 11.8°C | 25.2°C | 6.3°C | 102 mm | 74% | 3.1 m/s | 6.2 |
| 1985 | 20.0°C | 15.7°C | 11.4°C | 24.5°C | 6.8°C | 67 mm | 72% | 3.1 m/s | 6.4 |
| 1984 | 21.5°C | 17.4°C | 13.3°C | 25.4°C | 7.6°C | 118 mm | 78% | 3 m/s | 5.8 |
| 1983 | 22.9°C | 18.3°C | 13.7°C | 28.8°C | 6.2°C | 46 mm | 73% | 2.4 m/s | — |
| 1982 ❄️ | 19.4°C | 15.4°C | 11.4°C | 25.5°C | 7.8°C | 107 mm | 79% | 2.5 m/s | — |
| 1981 | 22.5°C | 18.2°C | 13.9°C | 27.0°C | 7.4°C | 99 mm | 75% | 3.1 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 22.6°C with lows near 13.9°C (mean 18.3°C), based on 45 years of NASA POWER data.
June averages 77 mm of rainfall in St. Catharines, a relatively wet time of year. The wettest on record was 171 mm in 2000.
The hottest June reached 32.9°C in 2005. The coldest dipped to 4.4°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.9°C. Daytime highs moved from 21.3°C to 24.3°C and overnight lows from 12.7°C to 15.5°C over the same span.
June is one of the warmer months of the year in St. Catharines and a relatively wet time of year, so plan for around 22.6°C daytime highs and 13.9°C at night.
Not quite — June is the 10th coolest month in St. Catharines, averaging 18.3°C.
For June in St. Catharines, pack light layers you can adjust through the day, with typical highs of 22.6°C and lows of 13.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 73% — moderately humid.
Average wind speed in June is 2.7 m/s. The windiest June on record averaged 3.2 m/s (2000).
The wettest June on record was 2000 with 171 mm. On average, June sees 77 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 St. Catharines 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.
