June is one of the warmer months of the year in Saint John, with average highs near 20.1°C and lows around 10°C (mean 15.1°C). It is about average for rainfall, averaging 101 mm of rainfall and 83% relative humidity across the period.
June is one of the warmer months of the year in Saint John. Across 45 years of records, the warmest June in Saint John was 2021 — when the month averaged 17.2°C — while the coldest were 1986, 2004 and 2015 at 13.3°C. Typical June days reach 20.1°C with nights near 10°C. The long-term trend is warming, about 0.2°C per decade.
June is about average for rainfall in Saint John, averaging 101 mm of rainfall. The wettest June on record was 2006 with 205 mm, while the driest was 1983 at 37 mm.
Relative humidity in Saint John during June averages 83%. The most humid June was 2023 at 88%, and the least humid was 2000 at 80%.
June receives about 5.5 kWh/m²/day of solar energy in Saint John. The sunniest June was 1988 at 6.4 kWh/m²/day, and the cloudiest was 2023 at 4.3.
Average wind speed in Saint John during June is 0.5 m/s. The windiest Junes were 2021, 2023 and 2025, among others at 0.5 m/s, while the calmest were 2020, 2022 and 2024, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.5°C | 15.2°C | 15.1°C | 14.6°C | 15.9°C | +1.4°C |
| Avg High | 19.5°C | 20.6°C | 20.2°C | 19.4°C | 21.0°C | +1.5°C |
| Avg Low | 9.6°C | 9.9°C | 10.1°C | 9.9°C | 10.9°C | +1.3°C |
| Avg Rain | 112 mm | 81 mm | 93 mm | 127 mm | 85 mm | -27 mm |
June temperatures in Saint John have risen by about 1.3°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 0.9°C (2018) to a record high of 31°C (2025).
Rainfall in June is about average for rainfall, averaging 101 mm, with a wettest year of 205 mm.
One of the best times to visit Saint John
June is one of the best times to visit Saint John. Expect days averaging 20.1°C and nights around 10°C (mean 15.1°C) — warmer than Saint John's yearly average — with higher rainfall (101 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 | 20.9°C | 15.8°C | 10.8°C | 31.0°C | 7.1°C | 74 mm | 82% | 0.5 m/s | 5.6 |
| 2024 | 21.6°C | 16.6°C | 11.5°C | 30.0°C | 5.1°C | 87 mm | 84% | 0.4 m/s | 5.7 |
| 2023 | 19.2°C | 14.6°C | 10.0°C | 28.2°C | 3.8°C | 168 mm | 88% | 0.5 m/s | 4.3 |
| 2022 | 20.2°C | 15.3°C | 10.4°C | 27.8°C | 5.8°C | 82 mm | 84% | 0.4 m/s | 5.7 |
| 2021 🔥 | 22.5°C | 17.2°C | 12.0°C | 29.6°C | 7.3°C | 50 mm | 82% | 0.5 m/s | 6.1 |
| 2020 | 21.5°C | 16.0°C | 10.5°C | 28.8°C | 2.3°C | 49 mm | 81% | 0.4 m/s | 6.2 |
| 2019 | 19.8°C | 14.7°C | 9.5°C | 23.7°C | 5.4°C | 125 mm | 83% | 0.4 m/s | 5.8 |
| 2018 | 18.8°C | 13.5°C | 8.2°C | 26.4°C | 0.9°C | 154 mm | 81% | 0.5 m/s | 6.1 |
| 2017 | 20.2°C | 15.3°C | 10.5°C | 26.9°C | 5.4°C | 89 mm | 84% | 0.5 m/s | 5.6 |
| 2016 | 19.5°C | 14.5°C | 9.6°C | 24.8°C | 6.0°C | 94 mm | 83% | 0.5 m/s | 5.6 |
| 2015 | 17.7°C | 13.3°C | 8.9°C | 24.2°C | 4.3°C | 157 mm | 83% | 0.5 m/s | 5.5 |
| 2014 | 20.4°C | 15.5°C | 10.6°C | 28.2°C | 4.9°C | 160 mm | 83% | 0.4 m/s | 5.6 |
| 2013 | 19.7°C | 15.1°C | 10.5°C | 27.8°C | 7.0°C | 151 mm | 85% | 0.5 m/s | 5 |
| 2012 | 19.2°C | 14.7°C | 10.2°C | 26.6°C | 6.3°C | 96 mm | 84% | 0.5 m/s | 5.4 |
| 2011 | 19.1°C | 14.4°C | 9.8°C | 24.1°C | 5.5°C | 85 mm | 84% | 0.4 m/s | 5.2 |
| 2010 | 19.8°C | 15.3°C | 10.8°C | 26.8°C | 6.7°C | 162 mm | 85% | 0.4 m/s | 5.1 |
| 2009 | 19.8°C | 15.3°C | 10.8°C | 25.4°C | 5.2°C | 125 mm | 84% | 0.5 m/s | 4.9 |
| 2008 | 20.6°C | 15.6°C | 10.5°C | 26.0°C | 6.8°C | 73 mm | 85% | 0.4 m/s | 5 |
| 2007 | 20.5°C | 15.3°C | 10.0°C | 26.1°C | 5.6°C | 63 mm | 82% | 0.5 m/s | 5.9 |
| 2006 🌧️ | 20.1°C | 15.9°C | 11.6°C | 25.0°C | 8.8°C | 205 mm | 88% | 0.4 m/s | 4.4 |
| 2005 | 20.8°C | 15.4°C | 10.0°C | 28.6°C | 5.4°C | 68 mm | 84% | 0.4 m/s | 5.4 |
| 2004 | 18.3°C | 13.3°C | 8.4°C | 27.9°C | 3.4°C | 81 mm | 82% | 0.5 m/s | 5.5 |
| 2003 | 20.8°C | 15.3°C | 9.9°C | 28.8°C | 4.7°C | 84 mm | 81% | 0.4 m/s | 6 |
| 2002 | 18.5°C | 13.6°C | 8.7°C | 24.8°C | 3.3°C | 70 mm | 82% | 0.5 m/s | 5.6 |
| 2001 | 22.2°C | 16.9°C | 11.6°C | 30.5°C | 7.1°C | 96 mm | 81% | 0.5 m/s | 5.9 |
| 2000 | 19.9°C | 14.7°C | 9.5°C | 27.3°C | 3.7°C | 64 mm | 80% | 0.5 m/s | 5.4 |
| 1999 | 22.1°C | 16.7°C | 11.3°C | 26.8°C | 6.1°C | 43 mm | 81% | 0.5 m/s | 6.3 |
| 1998 | 19.4°C | 14.6°C | 9.9°C | 26.3°C | 4.8°C | 89 mm | 84% | 0.5 m/s | 4.8 |
| 1997 | 20.6°C | 15.0°C | 9.3°C | 28.9°C | 3.7°C | 74 mm | 82% | 0.4 m/s | 6 |
| 1996 | 19.8°C | 14.5°C | 9.1°C | 26.6°C | 4.7°C | 70 mm | 84% | 0.4 m/s | 5.5 |
| 1995 | 21.9°C | 16.1°C | 10.3°C | 29.1°C | 7.1°C | 73 mm | 81% | 0.4 m/s | 5.9 |
| 1994 | 20.9°C | 16.0°C | 11.0°C | 26.4°C | 5.7°C | 102 mm | 84% | 0.5 m/s | 5.6 |
| 1993 | 19.4°C | 14.1°C | 8.9°C | 27.1°C | 3.8°C | 138 mm | 84% | 0.5 m/s | 5.5 |
| 1992 | 19.8°C | 14.7°C | 9.6°C | 24.8°C | 5.4°C | 122 mm | 84% | 0.5 m/s | 5.7 |
| 1991 | 20.9°C | 15.3°C | 9.8°C | 28.5°C | 5.9°C | 46 mm | 81% | 0.5 m/s | 6 |
| 1990 | 20.7°C | 15.4°C | 10.0°C | 24.5°C | 5.0°C | 55 mm | 84% | 0.5 m/s | 5.6 |
| 1989 | 20.3°C | 15.5°C | 10.8°C | 26.7°C | 5.6°C | 82 mm | 84% | 0.4 m/s | 5.2 |
| 1988 | 19.1°C | 13.8°C | 8.5°C | 27.4°C | 2.3°C | 64 mm | 81% | 0.5 m/s | 6.4 |
| 1987 | 19.8°C | 14.9°C | 10.0°C | 25.6°C | 6.8°C | 106 mm | 83% | 0.5 m/s | 5.7 |
| 1986 ❄️ | 18.4°C | 13.3°C | 8.3°C | 22.9°C | 2.6°C | 60 mm | 80% | 0.5 m/s | 5.9 |
| 1985 | 18.8°C | 14.0°C | 9.2°C | 22.5°C | 6.4°C | 179 mm | 84% | 0.5 m/s | 5 |
| 1984 | 19.0°C | 14.3°C | 9.7°C | 27.7°C | 4.0°C | 198 mm | 84% | 0.5 m/s | 5 |
| 1983 | 21.1°C | 15.8°C | 10.5°C | 29.3°C | 4.6°C | 37 mm | 82% | 0.4 m/s | — |
| 1982 | 19.1°C | 14.2°C | 9.4°C | 23.0°C | 6.0°C | 132 mm | 81% | 0.5 m/s | — |
| 1981 | 19.7°C | 14.8°C | 9.8°C | 26.3°C | 5.4°C | 148 mm | 83% | 0.5 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 20.1°C with lows near 10°C (mean 15.1°C), based on 45 years of NASA POWER data.
June averages 101 mm of rainfall in Saint John, about average for rainfall. The wettest on record was 205 mm in 2006.
The hottest June reached 31°C in 2025. The coldest dipped to 0.9°C in 2018.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 1.3°C. Daytime highs moved from 19.5°C to 20.9°C and overnight lows from 9.7°C to 10.9°C over the same span.
June is one of the warmer months of the year in Saint John and about average for rainfall, so plan for around 20.1°C daytime highs and 10°C at night.
Not quite — June is the 10th coolest month in Saint John, averaging 15.1°C.
For June in Saint John, pack light layers you can adjust through the day, with typical highs of 20.1°C and lows of 10°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 83% — quite humid.
Average wind speed in June is 0.5 m/s. The windiest June on record averaged 0.5 m/s (1981).
The wettest June on record was 2006 with 205 mm. On average, June sees 101 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 Saint John 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.
