April is one of the cooler months of the year in Saint John, with average highs near 9°C and lows around -0.4°C (mean 4.3°C). It is about average for rainfall, averaging 93 mm of rainfall and 82% relative humidity across the period.
April is one of the cooler months of the year in Saint John. Across 45 years of records, the warmest April in Saint John was 2010 — when the month averaged 6.9°C — while the coldest was 2003 at 2.2°C. Typical April days reach 9°C with nights near -0.4°C. The long-term trend is warming, about 0.2°C per decade.
April is about average for rainfall in Saint John, averaging 93 mm of rainfall. The wettest April on record was 2019 with 162 mm, while the driest was 1999 at 36 mm.
Relative humidity in Saint John during April averages 82%. The most humid April was 1983 at 87%, and the least humid was 2016 at 77%.
April receives about 4.5 kWh/m²/day of solar energy in Saint John. The sunniest April was 2016 at 5.3 kWh/m²/day, and the cloudiest was 2000 at 3.4.
Average wind speed in Saint John during April is 0.7 m/s. The windiest Aprils were 1981 and 1982 at 0.8 m/s, while the calmest were 2022, 2023 and 2025, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 4.2°C | 4.0°C | 4.2°C | 4.4°C | 4.9°C | +0.7°C |
| Avg High | 8.8°C | 8.8°C | 8.8°C | 9.0°C | 9.7°C | +0.9°C |
| Avg Low | -0.5°C | -0.8°C | -0.5°C | -0.2°C | 0.1°C | +0.6°C |
| Avg Rain | 98 mm | 85 mm | 96 mm | 98 mm | 83 mm | -15 mm |
April temperatures in Saint John have risen by about 1.5°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -11.7°C (1995) to a record high of 21.5°C (1987).
Rainfall in April is about average for rainfall, averaging 93 mm, with a wettest year of 162 mm.
A good time to visit Saint John
April is a good time to visit Saint John, with days averaging 9°C and nights around -0.4°C (mean 4.3°C, cooler than Saint John's yearly average) and higher rainfall. July and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 8.9°C | 4.6°C | 0.2°C | 18.0°C | -5.7°C | 121 mm | 81% | 0.6 m/s | 4 |
| 2024 | 10.0°C | 4.9°C | -0.2°C | 16.9°C | -4.8°C | 57 mm | 80% | 0.7 m/s | 4.9 |
| 2023 | 11.0°C | 5.9°C | 0.8°C | 16.7°C | -5.5°C | 41 mm | 80% | 0.6 m/s | 4.6 |
| 2022 | 9.5°C | 5.1°C | 0.6°C | 14.8°C | -3.3°C | 114 mm | 82% | 0.6 m/s | 4.1 |
| 2021 | 10.8°C | 5.9°C | 0.9°C | 19.2°C | -5.2°C | 82 mm | 82% | 0.7 m/s | 4.4 |
| 2020 | 7.8°C | 3.1°C | -1.6°C | 13.7°C | -4.8°C | 82 mm | 78% | 0.7 m/s | 5 |
| 2019 🌧️ | 8.2°C | 4.0°C | -0.1°C | 15.2°C | -6.7°C | 162 mm | 85% | 0.7 m/s | 3.8 |
| 2018 | 8.1°C | 3.7°C | -0.7°C | 18.4°C | -8.0°C | 130 mm | 80% | 0.7 m/s | 4.4 |
| 2017 | 10.2°C | 5.5°C | 0.8°C | 19.1°C | -5.0°C | 83 mm | 84% | 0.6 m/s | 3.9 |
| 2016 | 8.3°C | 3.2°C | -1.9°C | 20.0°C | -10.3°C | 74 mm | 77% | 0.7 m/s | 5.3 |
| 2015 | 7.3°C | 2.8°C | -1.7°C | 14.9°C | -10.5°C | 90 mm | 83% | 0.6 m/s | 4.6 |
| 2014 | 8.3°C | 3.9°C | -0.5°C | 14.0°C | -6.1°C | 97 mm | 85% | 0.7 m/s | 4.3 |
| 2013 | 9.0°C | 4.1°C | -0.7°C | 19.3°C | -5.1°C | 71 mm | 80% | 0.7 m/s | 4.7 |
| 2012 | 10.4°C | 5.8°C | 1.2°C | 17.9°C | -3.3°C | 112 mm | 83% | 0.6 m/s | 4.6 |
| 2011 | 8.9°C | 4.4°C | -0.1°C | 18.6°C | -4.5°C | 114 mm | 83% | 0.7 m/s | 4.2 |
| 2010 🔥 | 11.5°C | 6.9°C | 2.2°C | 16.1°C | -3.1°C | 47 mm | 83% | 0.6 m/s | 4.3 |
| 2009 | 10.2°C | 5.5°C | 0.8°C | 21.0°C | -4.0°C | 126 mm | 83% | 0.7 m/s | 4.6 |
| 2008 | 11.0°C | 5.6°C | 0.2°C | 18.5°C | -3.8°C | 53 mm | 81% | 0.6 m/s | 4.7 |
| 2007 | 7.3°C | 3.0°C | -1.2°C | 18.4°C | -4.4°C | 117 mm | 82% | 0.7 m/s | 4.1 |
| 2006 | 9.9°C | 5.2°C | 0.5°C | 16.8°C | -2.9°C | 67 mm | 81% | 0.7 m/s | 4.6 |
| 2005 | 10.0°C | 5.1°C | 0.2°C | 17.3°C | -4.1°C | 127 mm | 82% | 0.6 m/s | 4.4 |
| 2004 | 8.3°C | 4.0°C | -0.3°C | 19.8°C | -5.6°C | 98 mm | 83% | 0.6 m/s | 4.1 |
| 2003 ❄️ | 7.2°C | 2.2°C | -2.8°C | 19.7°C | -11.4°C | 69 mm | 80% | 0.6 m/s | 4.7 |
| 2002 | 7.8°C | 3.6°C | -0.6°C | 16.5°C | -4.4°C | 142 mm | 82% | 0.6 m/s | 3.9 |
| 2001 | 8.0°C | 3.4°C | -1.1°C | 16.0°C | -4.6°C | 40 mm | 81% | 0.7 m/s | 4.5 |
| 2000 | 8.5°C | 4.1°C | -0.3°C | 15.8°C | -5.1°C | 126 mm | 84% | 0.6 m/s | 3.4 |
| 1999 | 9.5°C | 4.7°C | 0.0°C | 14.9°C | -4.8°C | 36 mm | 79% | 0.7 m/s | 4.5 |
| 1998 | 10.0°C | 5.3°C | 0.5°C | 18.5°C | -3.8°C | 94 mm | 81% | 0.6 m/s | 4.8 |
| 1997 | 6.9°C | 2.4°C | -2.1°C | 13.5°C | -6.7°C | 70 mm | 81% | 0.7 m/s | 4.7 |
| 1996 | 8.6°C | 4.2°C | -0.2°C | 16.9°C | -5.9°C | 107 mm | 83% | 0.7 m/s | 4 |
| 1995 | 7.9°C | 2.9°C | -2.1°C | 13.7°C | -11.7°C | 68 mm | 81% | 0.6 m/s | 4.3 |
| 1994 | 9.5°C | 4.5°C | -0.5°C | 18.3°C | -8.2°C | 132 mm | 82% | 0.6 m/s | 4.5 |
| 1993 | 8.9°C | 4.4°C | -0.1°C | 15.0°C | -4.4°C | 95 mm | 83% | 0.7 m/s | 4 |
| 1992 | 7.5°C | 2.8°C | -2.0°C | 15.4°C | -7.3°C | 44 mm | 79% | 0.6 m/s | 4.9 |
| 1991 | 10.0°C | 4.8°C | -0.4°C | 17.3°C | -5.1°C | 90 mm | 82% | 0.6 m/s | 4.8 |
| 1990 | 9.0°C | 4.1°C | -0.8°C | 20.7°C | -5.8°C | 111 mm | 85% | 0.6 m/s | 4.2 |
| 1989 | 7.6°C | 3.1°C | -1.3°C | 15.3°C | -4.7°C | 90 mm | 84% | 0.6 m/s | 4.2 |
| 1988 | 8.2°C | 3.9°C | -0.4°C | 14.2°C | -5.1°C | 109 mm | 84% | 0.7 m/s | 4.6 |
| 1987 | 11.4°C | 6.1°C | 0.9°C | 21.5°C | -3.2°C | 60 mm | 83% | 0.6 m/s | 5.1 |
| 1986 | 10.1°C | 5.4°C | 0.7°C | 19.9°C | -5.2°C | 111 mm | 85% | 0.6 m/s | 4.5 |
| 1985 | 8.6°C | 3.3°C | -2.0°C | 17.7°C | -7.6°C | 39 mm | 78% | 0.7 m/s | 5.1 |
| 1984 | 8.9°C | 4.0°C | -0.8°C | 17.3°C | -5.0°C | 122 mm | 84% | 0.7 m/s | 4.6 |
| 1983 | 9.3°C | 5.1°C | 0.9°C | 16.1°C | -5.0°C | 133 mm | 87% | 0.6 m/s | — |
| 1982 | 6.6°C | 2.3°C | -2.1°C | 15.8°C | -10.9°C | 108 mm | 83% | 0.8 m/s | — |
| 1981 | 8.9°C | 4.3°C | -0.2°C | 14.2°C | -7.8°C | 113 mm | 81% | 0.8 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 9°C with lows near -0.4°C (mean 4.3°C), based on 45 years of NASA POWER data.
April averages 93 mm of rainfall in Saint John, about average for rainfall. The wettest on record was 162 mm in 2019.
The hottest April reached 21.5°C in 1987. The coldest dipped to -11.7°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.5°C. Daytime highs moved from 8.5°C to 10°C and overnight lows from -0.8°C to 0.5°C over the same span.
April is one of the cooler months of the year in Saint John and about average for rainfall, so plan for around 9°C daytime highs and -0.4°C at night.
Not quite — April is the 6th coolest month in Saint John, averaging 4.3°C.
For April in Saint John, pack warm layers and a jacket for chilly mornings, with typical highs of 9°C and lows of -0.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 82% — quite humid.
Average wind speed in April is 0.7 m/s. The windiest April on record averaged 0.8 m/s (1981).
The wettest April on record was 2019 with 162 mm. On average, April sees 93 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
