March is one of the cooler months of the year in Saint John, with average highs near 2.1°C and lows around -6.5°C (mean -2.2°C). It is about average for rainfall, averaging 95 mm of rainfall and 86% relative humidity across the period.
March is one of the cooler months of the year in Saint John. Across 45 years of records, the warmest March in Saint John was 2012 — when the month averaged 1.2°C — while the coldest was 2015 at -6.6°C. Typical March days reach 2.1°C with nights near -6.5°C. The long-term trend is warming, about 0.4°C per decade.
March is about average for rainfall in Saint John, averaging 95 mm of rainfall. The wettest March on record was 2024 with 227 mm, while the driest was 2006 at 32 mm.
Relative humidity in Saint John during March averages 86%. The most humid March was 2015 at 97%, and the least humid was 2002 at 78%.
March receives about 3.5 kWh/m²/day of solar energy in Saint John. The sunniest March was 2021 at 4.1 kWh/m²/day, and the cloudiest was 2024 at 2.9.
Average wind speed in Saint John during March is 0.7 m/s. The windiest March was 2018 at 0.9 m/s, while the calmest were 2022, 2023 and 2025, among others at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -3.0°C | -2.5°C | -2.0°C | -2.2°C | -0.5°C | +2.5°C |
| Avg High | 1.4°C | 1.9°C | 2.3°C | 1.9°C | 3.7°C | +2.3°C |
| Avg Low | -7.3°C | -6.8°C | -6.4°C | -6.4°C | -4.7°C | +2.6°C |
| Avg Rain | 90 mm | 101 mm | 99 mm | 89 mm | 97 mm | +7 mm |
March temperatures in Saint John have risen by about 2.3°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -29.2°C (1982) to a record high of 21.7°C (2012).
Rainfall in March is about average for rainfall, averaging 95 mm, with a wettest year of 227 mm.
A quieter season to visit Saint John
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Saint John. That said, March — with days averaging 2.1°C and nights around -6.5°C (mean -2.2°C) and higher rainfall (95 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 4.4°C | -0.2°C | -4.7°C | 11.0°C | -15.6°C | 124 mm | 83% | 0.7 m/s | 3.3 |
| 2024 🌧️ | 4.4°C | 0.7°C | -2.9°C | 11.5°C | -12.1°C | 227 mm | 88% | 0.8 m/s | 2.9 |
| 2023 | 3.5°C | -0.3°C | -4.1°C | 7.4°C | -11.8°C | 44 mm | 83% | 0.7 m/s | 3.4 |
| 2022 | 3.0°C | -1.1°C | -5.3°C | 13.6°C | -21.1°C | 88 mm | 86% | 0.7 m/s | 3.2 |
| 2021 | 3.8°C | -1.3°C | -6.5°C | 14.5°C | -17.0°C | 55 mm | 81% | 0.8 m/s | 4.1 |
| 2020 | 3.2°C | -0.9°C | -5.0°C | 9.2°C | -12.4°C | 46 mm | 80% | 0.8 m/s | 3.7 |
| 2019 | 1.6°C | -2.8°C | -7.2°C | 12.5°C | -19.4°C | 72 mm | 86% | 0.7 m/s | 3.8 |
| 2018 | 1.9°C | -1.2°C | -4.4°C | 9.4°C | -14.6°C | 84 mm | 87% | 0.9 m/s | 3.1 |
| 2017 | 0.3°C | -4.3°C | -8.9°C | 9.4°C | -18.7°C | 79 mm | 79% | 0.8 m/s | 3.6 |
| 2016 | 1.9°C | -2.1°C | -6.1°C | 9.0°C | -18.3°C | 113 mm | 85% | 0.7 m/s | 3.1 |
| 2015 ❄️ | -2.1°C | -6.6°C | -11.2°C | 3.0°C | -25.6°C | 70 mm | 97% | 0.7 m/s | 3.4 |
| 2014 | -1.1°C | -5.9°C | -10.6°C | 7.2°C | -21.3°C | 137 mm | 86% | 0.8 m/s | 3.5 |
| 2013 | 3.1°C | -0.1°C | -3.4°C | 10.8°C | -13.1°C | 85 mm | 85% | 0.8 m/s | 3.3 |
| 2012 🔥 | 5.6°C | 1.2°C | -3.3°C | 21.7°C | -12.2°C | 66 mm | 85% | 0.7 m/s | 3.5 |
| 2011 | 2.8°C | -1.7°C | -6.2°C | 11.9°C | -25.3°C | 75 mm | 84% | 0.8 m/s | 3.8 |
| 2010 | 5.0°C | 1.0°C | -3.0°C | 14.5°C | -10.7°C | 104 mm | 82% | 0.8 m/s | 3.7 |
| 2009 | 2.5°C | -2.0°C | -6.5°C | 11.3°C | -19.7°C | 78 mm | 84% | 0.8 m/s | 3.7 |
| 2008 | 0.6°C | -3.9°C | -8.5°C | 5.5°C | -14.9°C | 133 mm | 86% | 0.8 m/s | 3.3 |
| 2007 | 2.1°C | -2.4°C | -6.8°C | 9.3°C | -21.0°C | 66 mm | 84% | 0.8 m/s | 3.5 |
| 2006 | 3.6°C | -0.6°C | -4.8°C | 13.2°C | -16.9°C | 32 mm | 82% | 0.7 m/s | 3.7 |
| 2005 | 2.5°C | -1.7°C | -5.8°C | 9.3°C | -16.0°C | 118 mm | 83% | 0.7 m/s | 3.7 |
| 2004 | 1.9°C | -2.1°C | -6.2°C | 8.7°C | -15.1°C | 76 mm | 83% | 0.7 m/s | 3.7 |
| 2003 | 0.8°C | -4.1°C | -9.1°C | 10.1°C | -21.9°C | 161 mm | 92% | 0.7 m/s | 3.2 |
| 2002 | 3.0°C | -1.4°C | -5.9°C | 12.7°C | -11.4°C | 124 mm | 78% | 0.7 m/s | 3.4 |
| 2001 | 1.0°C | -2.8°C | -6.6°C | 10.9°C | -23.6°C | 96 mm | 89% | 0.8 m/s | 3.5 |
| 2000 | 5.1°C | 0.7°C | -3.7°C | 11.6°C | -12.4°C | 109 mm | 86% | 0.8 m/s | 3.6 |
| 1999 | 4.1°C | 0.3°C | -3.6°C | 14.6°C | -12.1°C | 147 mm | 87% | 0.8 m/s | 3.4 |
| 1998 | 3.9°C | -0.3°C | -4.5°C | 21.3°C | -14.4°C | 100 mm | 87% | 0.7 m/s | 3.4 |
| 1997 | -1.4°C | -5.6°C | -9.8°C | 7.4°C | -21.0°C | 104 mm | 91% | 0.7 m/s | 3.7 |
| 1996 | 1.5°C | -2.8°C | -7.1°C | 8.3°C | -17.8°C | 86 mm | 85% | 0.7 m/s | 3.6 |
| 1995 | 2.4°C | -1.8°C | -6.0°C | 9.3°C | -17.7°C | 67 mm | 87% | 0.7 m/s | 3 |
| 1994 | 1.4°C | -2.3°C | -6.1°C | 7.0°C | -20.2°C | 167 mm | 91% | 0.7 m/s | 3.2 |
| 1993 | 1.4°C | -3.8°C | -9.0°C | 17.1°C | -21.2°C | 90 mm | 91% | 0.8 m/s | 3.6 |
| 1992 | -0.4°C | -5.3°C | -10.2°C | 10.3°C | -23.3°C | 69 mm | 87% | 0.7 m/s | 4 |
| 1991 | 3.0°C | -1.2°C | -5.3°C | 9.5°C | -11.5°C | 129 mm | 88% | 0.8 m/s | 3.6 |
| 1990 | 2.6°C | -2.0°C | -6.6°C | 10.0°C | -18.5°C | 54 mm | 81% | 0.7 m/s | 3.8 |
| 1989 | 0.6°C | -4.4°C | -9.4°C | 15.7°C | -24.5°C | 71 mm | 87% | 0.8 m/s | 3.7 |
| 1988 | 3.0°C | -2.3°C | -7.5°C | 11.8°C | -16.3°C | 36 mm | 80% | 0.7 m/s | 3.7 |
| 1987 | 0.7°C | -3.3°C | -7.3°C | 13.9°C | -21.2°C | 92 mm | 96% | 0.7 m/s | 3.1 |
| 1986 | 1.6°C | -3.2°C | -8.0°C | 13.2°C | -18.5°C | 120 mm | 88% | 0.7 m/s | 3.6 |
| 1985 | 1.8°C | -3.0°C | -7.8°C | 12.5°C | -20.6°C | 72 mm | 80% | 0.8 m/s | 3.9 |
| 1984 | -1.5°C | -5.0°C | -8.5°C | 6.1°C | -21.4°C | 132 mm | 87% | 0.8 m/s | 3.6 |
| 1983 | 2.6°C | -1.3°C | -5.2°C | 10.6°C | -16.7°C | 125 mm | 87% | 0.8 m/s | — |
| 1982 | 1.0°C | -3.5°C | -7.9°C | 8.8°C | -29.2°C | 78 mm | 88% | 0.7 m/s | — |
| 1981 | 2.9°C | -0.6°C | -4.1°C | 10.1°C | -11.8°C | 87 mm | 87% | 0.7 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 2.1°C with lows near -6.5°C (mean -2.2°C), based on 45 years of NASA POWER data.
March averages 95 mm of rainfall in Saint John, about average for rainfall. The wettest on record was 227 mm in 2024.
The hottest March reached 21.7°C in 2012. The coldest dipped to -29.2°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 2.3°C. Daytime highs moved from 1.4°C to 3.8°C and overnight lows from -6.7°C to -4.7°C over the same span.
March is one of the cooler months of the year in Saint John and about average for rainfall, so plan for around 2.1°C daytime highs and -6.5°C at night.
Not quite — March is the 4th coolest month in Saint John, averaging -2.2°C.
For March in Saint John, pack warm layers and a jacket for chilly mornings, with typical highs of 2.1°C and lows of -6.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 86% — quite humid.
Average wind speed in March is 0.7 m/s. The windiest March on record averaged 0.9 m/s (2018).
The wettest March on record was 2024 with 227 mm. On average, March sees 95 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 March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
