June is one of the warmer months of the year in Sarnia, with average highs near 23.3°C and lows around 13°C (mean 18.2°C). It is a relatively wet time of year, averaging 80 mm of rainfall and 75% relative humidity across the period.
June is one of the warmer months of the year in Sarnia. Across 45 years of records, the warmest June in Sarnia was 2005 — when the month averaged 21.6°C — while the coldest was 1985 at 14.7°C. Typical June days reach 23.3°C with nights near 13°C. The long-term trend is warming, about 0.5°C per decade.
June is a relatively wet time of year in Sarnia, averaging 80 mm of rainfall. The wettest June on record was 1994 with 135 mm, while the driest was 1988 at 20 mm.
Relative humidity in Sarnia during June averages 75%. The most humid June was 2011 at 80%, and the least humid was 1988 at 61%.
June receives about 6.2 kWh/m²/day of solar energy in Sarnia. The sunniest June was 2020 at 7.3 kWh/m²/day, and the cloudiest was 1996 at 5.3.
Average wind speed in Sarnia during June is 2.9 m/s. The windiest Junes were 1988 and 1990 at 3.6 m/s, while the calmest was 1995 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.1°C | 18.0°C | 18.4°C | 18.2°C | 19.4°C | +2.3°C |
| Avg High | 22.4°C | 23.1°C | 23.4°C | 23.2°C | 24.6°C | +2.2°C |
| Avg Low | 11.7°C | 12.8°C | 13.3°C | 13.1°C | 14.2°C | +2.5°C |
| Avg Rain | 80 mm | 80 mm | 77 mm | 88 mm | 75 mm | -5 mm |
June temperatures in Sarnia have risen by about 2.8°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 3.1°C (1986) to a record high of 33.1°C (1988).
Rainfall in June is a relatively wet time of year, averaging 80 mm, with a wettest year of 135 mm.
One of the best times to visit Sarnia
June is one of the best times to visit Sarnia. Expect days averaging 23.3°C and nights around 13°C (mean 18.2°C) — warmer than Sarnia's yearly average — with higher rainfall (80 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 | 24.7°C | 19.7°C | 14.7°C | 31.0°C | 5.4°C | 104 mm | 76% | 2.9 m/s | 6 |
| 2024 | 24.6°C | 19.7°C | 14.8°C | 30.1°C | 8.0°C | 91 mm | 76% | 3.1 m/s | 6 |
| 2023 | 23.4°C | 18.3°C | 13.2°C | 29.9°C | 8.1°C | 65 mm | 70% | 2.7 m/s | 6.1 |
| 2022 | 24.2°C | 18.6°C | 13.0°C | 30.2°C | 6.9°C | 58 mm | 70% | 2.9 m/s | 6.8 |
| 2021 | 26.0°C | 21.1°C | 16.1°C | 30.6°C | 9.2°C | 86 mm | 71% | 3.1 m/s | 6.1 |
| 2020 | 24.6°C | 19.0°C | 13.4°C | 29.3°C | 7.2°C | 44 mm | 71% | 2.8 m/s | 7.3 |
| 2019 | 21.6°C | 16.4°C | 11.2°C | 27.8°C | 5.1°C | 88 mm | 79% | 2.9 m/s | 6 |
| 2018 | 23.4°C | 18.3°C | 13.2°C | 30.5°C | 7.7°C | 82 mm | 78% | 3 m/s | 5.9 |
| 2017 | 23.3°C | 18.6°C | 13.8°C | 29.0°C | 8.6°C | 107 mm | 79% | 3.3 m/s | 6.4 |
| 2016 | 23.9°C | 18.6°C | 13.2°C | 29.6°C | 6.8°C | 81 mm | 73% | 3 m/s | 6.9 |
| 2015 | 22.3°C | 17.0°C | 11.7°C | 27.3°C | 5.1°C | 123 mm | 80% | 3 m/s | 5.6 |
| 2014 | 23.3°C | 18.3°C | 13.2°C | 28.8°C | 7.9°C | 74 mm | 77% | 2.8 m/s | 6.2 |
| 2013 | 22.4°C | 17.9°C | 13.3°C | 28.3°C | 6.7°C | 92 mm | 80% | 2.9 m/s | 5.9 |
| 2012 | 24.5°C | 19.4°C | 14.3°C | 30.5°C | 8.9°C | 59 mm | 73% | 3.3 m/s | 6.7 |
| 2011 | 22.7°C | 17.7°C | 12.7°C | 27.3°C | 7.6°C | 79 mm | 80% | 2.9 m/s | 6.2 |
| 2010 | 24.2°C | 19.4°C | 14.5°C | 28.0°C | 10.1°C | 89 mm | 76% | 3.1 m/s | 6.1 |
| 2009 | 21.7°C | 16.6°C | 11.5°C | 29.2°C | 3.8°C | 102 mm | 78% | 2.7 m/s | 5.9 |
| 2008 | 23.6°C | 19.2°C | 14.8°C | 28.9°C | 9.2°C | 121 mm | 80% | 3.1 m/s | 5.6 |
| 2007 | 24.9°C | 19.6°C | 14.2°C | 30.6°C | 7.2°C | 32 mm | 68% | 2.9 m/s | 6.9 |
| 2006 | 23.1°C | 18.3°C | 13.5°C | 29.4°C | 8.0°C | 57 mm | 72% | 3.1 m/s | 6.4 |
| 2005 🔥 | 26.6°C | 21.6°C | 16.5°C | 32.8°C | 10.5°C | 66 mm | 74% | 2.8 m/s | 6.3 |
| 2004 | 22.1°C | 16.9°C | 11.8°C | 27.8°C | 5.2°C | 71 mm | 76% | 3 m/s | 6.2 |
| 2003 | 22.1°C | 16.5°C | 10.9°C | 30.1°C | 3.2°C | 63 mm | 74% | 3 m/s | 5.9 |
| 2002 | 23.6°C | 18.4°C | 13.1°C | 30.0°C | 6.9°C | 56 mm | 78% | 2.8 m/s | 6.1 |
| 2001 | 23.4°C | 18.2°C | 13.0°C | 29.4°C | 5.7°C | 78 mm | 76% | 2.6 m/s | 6.4 |
| 2000 | 23.4°C | 18.6°C | 13.8°C | 28.9°C | 8.7°C | 128 mm | 75% | 3.5 m/s | 5.6 |
| 1999 | 24.8°C | 19.6°C | 14.3°C | 30.4°C | 7.1°C | 89 mm | 69% | 2.6 m/s | 6.3 |
| 1998 | 23.4°C | 18.6°C | 13.8°C | 30.4°C | 5.7°C | 52 mm | 74% | 3 m/s | 5.9 |
| 1997 | 23.3°C | 18.3°C | 13.2°C | 28.6°C | 8.3°C | 50 mm | 76% | 2.8 m/s | 6.3 |
| 1996 | 23.0°C | 18.3°C | 13.7°C | 28.9°C | 6.5°C | 132 mm | 80% | 2.7 m/s | 5.3 |
| 1995 | 24.2°C | 19.0°C | 13.7°C | 32.3°C | 7.5°C | 54 mm | 73% | 2.4 m/s | 6 |
| 1994 🌧️ | 23.7°C | 18.1°C | 12.5°C | 31.5°C | 3.8°C | 135 mm | 73% | 2.8 m/s | 6 |
| 1993 | 21.6°C | 16.4°C | 11.2°C | 26.6°C | 3.1°C | 115 mm | 78% | 3 m/s | 5.5 |
| 1992 | 21.0°C | 15.6°C | 10.2°C | 27.3°C | 4.3°C | 62 mm | 69% | 2.7 m/s | 6.5 |
| 1991 | 24.4°C | 19.2°C | 13.9°C | 28.9°C | 8.1°C | 41 mm | 73% | 2.8 m/s | 6.7 |
| 1990 | 21.9°C | 16.8°C | 11.8°C | 27.3°C | 4.9°C | 69 mm | 76% | 3.6 m/s | 5.8 |
| 1989 | 22.9°C | 17.9°C | 12.9°C | 29.5°C | 7.5°C | 109 mm | 78% | 2.5 m/s | 5.5 |
| 1988 | 23.8°C | 17.5°C | 11.1°C | 33.1°C | 6.0°C | 20 mm | 61% | 3.6 m/s | 7.2 |
| 1987 | 24.0°C | 18.6°C | 13.1°C | 29.6°C | 5.8°C | 75 mm | 73% | 2.9 m/s | 6.3 |
| 1986 | 21.8°C | 16.3°C | 10.7°C | 27.0°C | 3.1°C | 122 mm | 77% | 3.2 m/s | 6.2 |
| 1985 ❄️ | 19.9°C | 14.7°C | 9.6°C | 24.8°C | 5.3°C | 53 mm | 73% | 3.1 m/s | 6.7 |
| 1984 | 22.9°C | 17.7°C | 12.4°C | 26.7°C | 7.4°C | 88 mm | 77% | 3.2 m/s | 5.9 |
| 1983 | 23.0°C | 17.6°C | 12.1°C | 28.6°C | 4.2°C | 81 mm | 75% | 2.5 m/s | — |
| 1982 | 20.1°C | 15.1°C | 10.1°C | 25.2°C | 5.2°C | 98 mm | 78% | 2.8 m/s | — |
| 1981 | 23.1°C | 18.2°C | 13.2°C | 28.3°C | 5.8°C | 73 mm | 75% | 3.3 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 23.3°C with lows near 13°C (mean 18.2°C), based on 45 years of NASA POWER data.
June averages 80 mm of rainfall in Sarnia, a relatively wet time of year. The wettest on record was 135 mm in 1994.
The hottest June reached 33.1°C in 1988. The coldest dipped to 3.1°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.8°C. Daytime highs moved from 21.8°C to 24.6°C and overnight lows from 11.5°C to 14.4°C over the same span.
June is one of the warmer months of the year in Sarnia and a relatively wet time of year, so plan for around 23.3°C daytime highs and 13°C at night.
Not quite — June is the 10th coolest month in Sarnia, averaging 18.2°C.
For June in Sarnia, pack light layers you can adjust through the day, with typical highs of 23.3°C and lows of 13°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 75% — moderately humid.
Average wind speed in June is 2.9 m/s. The windiest June on record averaged 3.6 m/s (1988).
The wettest June on record was 1994 with 135 mm. On average, June sees 80 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 Sarnia 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.
