June is one of the warmer months of the year in Summerside, with average highs near 17.6°C and lows around 10.4°C (mean 14°C). It is about average for rainfall, averaging 91 mm of rainfall and 83% relative humidity across the period.
June is one of the warmer months of the year in Summerside. Across 45 years of records, the warmest June in Summerside was 2021 — when the month averaged 16.5°C — while the coldest was 1986 at 12.3°C. Typical June days reach 17.6°C with nights near 10.4°C. The long-term trend is warming, about 0.3°C per decade.
June is about average for rainfall in Summerside, averaging 91 mm of rainfall. The wettest June on record was 1981 with 162 mm, while the driest was 1999 at 31 mm.
Relative humidity in Summerside during June averages 83%. The most humid June was 2006 at 91%, and the least humid was 1999 at 76%.
June receives about 5.6 kWh/m²/day of solar energy in Summerside. The sunniest June was 1999 at 6.5 kWh/m²/day, and the cloudiest was 1984 at 4.6.
Average wind speed in Summerside during June is 3.4 m/s. The windiest June was 1985 at 4 m/s, while the calmest was 1983 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.4°C | 14.1°C | 13.9°C | 13.7°C | 15.3°C | +1.9°C |
| Avg High | 17.0°C | 18.0°C | 17.4°C | 17.1°C | 18.9°C | +1.9°C |
| Avg Low | 9.8°C | 10.2°C | 10.4°C | 10.3°C | 11.8°C | +2°C |
| Avg Rain | 102 mm | 63 mm | 92 mm | 108 mm | 93 mm | -9 mm |
June temperatures in Summerside have risen by about 1.8°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 2.7°C (2018) to a record high of 27.1°C (2024).
Rainfall in June is about average for rainfall, averaging 91 mm, with a wettest year of 162 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Summerside
June is one of the best times to visit Summerside. Expect days averaging 17.6°C and nights around 10.4°C (mean 14°C) — warmer than Summerside's yearly average — with higher rainfall (91 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 | 19.3°C | 15.4°C | 11.5°C | 27.1°C | 7.8°C | 78 mm | 81% | 3.7 m/s | 6.1 |
| 2024 | 18.7°C | 15.5°C | 12.4°C | 27.1°C | 6.5°C | 113 mm | 86% | 3.5 m/s | 5.4 |
| 2023 | 17.2°C | 14.0°C | 10.8°C | 25.2°C | 5.1°C | 122 mm | 88% | 3.7 m/s | 4.8 |
| 2022 | 18.5°C | 15.1°C | 11.6°C | 24.5°C | 5.3°C | 121 mm | 84% | 3.1 m/s | 5.8 |
| 2021 🔥 | 20.3°C | 16.5°C | 12.8°C | 26.3°C | 7.0°C | 80 mm | 83% | 3.6 m/s | 6.1 |
| 2020 | 19.1°C | 15.5°C | 11.9°C | 27.0°C | 6.0°C | 47 mm | 83% | 3.5 m/s | 5.8 |
| 2019 | 17.7°C | 14.1°C | 10.6°C | 21.7°C | 7.3°C | 140 mm | 82% | 3.2 m/s | 5.7 |
| 2018 | 16.1°C | 12.4°C | 8.6°C | 23.0°C | 2.7°C | 156 mm | 80% | 3.9 m/s | 5.6 |
| 2017 | 18.3°C | 14.7°C | 11.2°C | 22.6°C | 4.4°C | 82 mm | 84% | 3.5 m/s | 5.7 |
| 2016 | 16.6°C | 13.2°C | 9.8°C | 22.1°C | 4.0°C | 74 mm | 85% | 3.6 m/s | 5.6 |
| 2015 | 16.0°C | 12.7°C | 9.5°C | 20.7°C | 5.4°C | 115 mm | 83% | 3.6 m/s | 5.3 |
| 2014 | 17.5°C | 13.9°C | 10.4°C | 24.7°C | 4.8°C | 108 mm | 84% | 3.1 m/s | 5.6 |
| 2013 | 17.8°C | 14.4°C | 11.1°C | 23.7°C | 6.7°C | 102 mm | 84% | 3.3 m/s | 5.3 |
| 2012 | 17.5°C | 14.2°C | 11.0°C | 23.7°C | 8.2°C | 70 mm | 85% | 3.7 m/s | 5.7 |
| 2011 | 16.0°C | 12.9°C | 9.8°C | 22.0°C | 5.9°C | 90 mm | 87% | 3.3 m/s | 4.8 |
| 2010 | 17.4°C | 14.0°C | 10.6°C | 22.0°C | 6.6°C | 144 mm | 84% | 3.2 m/s | 5.2 |
| 2009 | 17.9°C | 14.7°C | 11.5°C | 23.4°C | 6.9°C | 109 mm | 85% | 3.4 m/s | 5.5 |
| 2008 | 17.4°C | 14.3°C | 11.3°C | 22.4°C | 7.6°C | 90 mm | 87% | 3.1 m/s | 4.9 |
| 2007 | 16.9°C | 13.4°C | 9.8°C | 21.5°C | 4.0°C | 86 mm | 85% | 3.2 m/s | 5.8 |
| 2006 | 17.7°C | 14.4°C | 11.1°C | 23.0°C | 7.2°C | 160 mm | 91% | 3.2 m/s | 4.8 |
| 2005 | 17.4°C | 13.6°C | 9.8°C | 24.6°C | 5.9°C | 71 mm | 84% | 3.6 m/s | 5.8 |
| 2004 | 16.1°C | 12.5°C | 9.0°C | 22.7°C | 5.1°C | 101 mm | 82% | 3.4 m/s | 6 |
| 2003 | 18.2°C | 14.4°C | 10.6°C | 27.0°C | 4.7°C | 96 mm | 84% | 3.1 m/s | 5.6 |
| 2002 | 16.1°C | 12.5°C | 8.9°C | 22.7°C | 4.2°C | 71 mm | 81% | 3.5 m/s | 5.6 |
| 2001 | 18.8°C | 15.2°C | 11.7°C | 26.1°C | 6.8°C | 66 mm | 83% | 3.2 m/s | 6 |
| 2000 | 17.7°C | 14.0°C | 10.3°C | 23.9°C | 4.0°C | 73 mm | 79% | 3.3 m/s | 6.2 |
| 1999 | 20.3°C | 16.1°C | 11.9°C | 24.8°C | 6.7°C | 31 mm | 76% | 3.2 m/s | 6.5 |
| 1998 | 17.4°C | 14.0°C | 10.6°C | 22.6°C | 6.0°C | 67 mm | 82% | 3.6 m/s | 5.4 |
| 1997 | 17.0°C | 13.3°C | 9.5°C | 25.6°C | 3.8°C | 58 mm | 83% | 2.9 m/s | 5.4 |
| 1996 | 18.5°C | 14.5°C | 10.5°C | 23.2°C | 4.1°C | 50 mm | 81% | 3.3 m/s | 6.2 |
| 1995 | 18.7°C | 14.3°C | 10.0°C | 24.4°C | 5.3°C | 84 mm | 79% | 3.1 m/s | 5.9 |
| 1994 | 18.4°C | 14.4°C | 10.3°C | 23.7°C | 3.3°C | 99 mm | 84% | 3.5 m/s | 5.6 |
| 1993 | 17.2°C | 13.2°C | 9.2°C | 24.2°C | 3.8°C | 88 mm | 81% | 3.5 m/s | 5 |
| 1992 | 17.4°C | 13.5°C | 9.6°C | 22.8°C | 4.0°C | 62 mm | 83% | 3 m/s | 5.7 |
| 1991 | 17.5°C | 13.6°C | 9.8°C | 23.0°C | 5.5°C | 45 mm | 81% | 3.4 m/s | 5.9 |
| 1990 | 18.0°C | 14.2°C | 10.4°C | 22.5°C | 3.1°C | 44 mm | 85% | 3.6 m/s | 5.8 |
| 1989 | 18.0°C | 14.5°C | 11.0°C | 23.7°C | 6.2°C | 65 mm | 85% | 3.1 m/s | 5.4 |
| 1988 | 16.0°C | 12.5°C | 9.0°C | 23.6°C | 4.7°C | 62 mm | 84% | 3.8 m/s | 5.5 |
| 1987 | 17.1°C | 13.5°C | 9.9°C | 21.0°C | 5.9°C | 124 mm | 83% | 3.3 m/s | 5.7 |
| 1986 ❄️ | 16.2°C | 12.3°C | 8.5°C | 20.7°C | 4.9°C | 70 mm | 81% | 3.6 m/s | 6.2 |
| 1985 | 16.3°C | 12.7°C | 9.2°C | 19.8°C | 6.1°C | 156 mm | 86% | 4 m/s | 5.4 |
| 1984 | 16.7°C | 13.2°C | 9.7°C | 22.9°C | 3.9°C | 119 mm | 85% | 3.7 m/s | 4.6 |
| 1983 | 18.2°C | 14.5°C | 10.8°C | 24.8°C | 6.9°C | 36 mm | 83% | 2.8 m/s | — |
| 1982 | 16.2°C | 12.9°C | 9.6°C | 20.3°C | 4.8°C | 123 mm | 85% | 3.1 m/s | — |
| 1981 🌧️ | 18.0°C | 14.3°C | 10.7°C | 25.2°C | 6.8°C | 162 mm | 85% | 3.6 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 17.6°C with lows near 10.4°C (mean 14°C), based on 45 years of NASA POWER data.
June averages 91 mm of rainfall in Summerside, about average for rainfall. The wettest on record was 162 mm in 1981.
The hottest June reached 27.1°C in 2024. The coldest dipped to 2.7°C in 2018.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 1.8°C. Daytime highs moved from 17.1°C to 18.8°C and overnight lows from 10°C to 11.8°C over the same span.
June is one of the warmer months of the year in Summerside and about average for rainfall, so plan for around 17.6°C daytime highs and 10.4°C at night.
Not quite — June is the 9th coolest month in Summerside, averaging 14°C.
For June in Summerside, pack light layers you can adjust through the day, with typical highs of 17.6°C and lows of 10.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 83% — quite humid.
Average wind speed in June is 3.4 m/s. The windiest June on record averaged 4 m/s (1985).
The wettest June on record was 1981 with 162 mm. On average, June sees 91 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 Summerside 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.
