March is one of the cooler months of the year in St. John's, with average highs near 0.4°C and lows around -3.2°C (mean -1.4°C). It is about average for rainfall, averaging 114 mm of rainfall and 87% relative humidity across the period.
March is one of the cooler months of the year in St. John's. Across 45 years of records, the warmest March in St. John's was 1999 — when the month averaged 1°C — while the coldest was 2003 at -3.9°C. Typical March days reach 0.4°C with nights near -3.2°C. The long-term trend is warming, about 0.3°C per decade.
March is about average for rainfall in St. John's, averaging 114 mm of rainfall. The wettest March on record was 2008 with 185 mm, while the driest was 1990 at 65 mm.
Relative humidity in St. John's during March averages 87%. The most humid March was 1983 at 92%, and the least humid was 1990 at 82%.
March receives about 2.8 kWh/m²/day of solar energy in St. John's. The sunniest Marchs were 2016, 2019 and 2022 at 3.2 kWh/m²/day, and the cloudiest were 1991 and 2006 at 2.4.
Average wind speed in St. John's during March is 5.8 m/s. The windiest March was 2002 at 6.8 m/s, while the calmest was 2025 at 4.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -1.8°C | -1.6°C | -1.4°C | -1.4°C | -0.5°C | +1.3°C |
| Avg High | 0.2°C | 0.4°C | 0.3°C | 0.3°C | 1.1°C | +0.9°C |
| Avg Low | -3.8°C | -3.6°C | -3.0°C | -3.0°C | -2.1°C | +1.7°C |
| Avg Rain | 111 mm | 113 mm | 124 mm | 113 mm | 107 mm | -4 mm |
March temperatures in St. John's have risen by about 1.2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -18°C (1986) to a record high of 8.5°C (2022).
Rainfall in March is about average for rainfall, averaging 114 mm, with a wettest year of 185 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.1°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A quieter season to visit St. John's
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting St. John's. That said, March — with days averaging 0.4°C and nights around -3.2°C (mean -1.4°C) and higher rainfall (114 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 | 2.0°C | 0.3°C | -1.5°C | 7.3°C | -5.1°C | 91 mm | 87% | 4.7 m/s | 3 |
| 2024 | 1.6°C | 0.1°C | -1.4°C | 6.7°C | -5.0°C | 152 mm | 87% | 4.9 m/s | 2.7 |
| 2023 | -0.2°C | -1.2°C | -2.2°C | 2.6°C | -8.3°C | 83 mm | 88% | 6.2 m/s | 3.1 |
| 2022 | 0.9°C | -0.9°C | -2.6°C | 8.5°C | -8.2°C | 114 mm | 85% | 6 m/s | 3.2 |
| 2021 | 1.8°C | 0.1°C | -1.7°C | 7.8°C | -4.2°C | 84 mm | 85% | 5.6 m/s | 3.1 |
| 2020 | 0.3°C | -1.5°C | -3.3°C | 5.4°C | -9.9°C | 117 mm | 85% | 6.1 m/s | 2.9 |
| 2019 | -0.1°C | -1.9°C | -3.7°C | 4.9°C | -8.5°C | 74 mm | 84% | 5.3 m/s | 3.2 |
| 2018 | 1.1°C | 0.2°C | -0.7°C | 3.7°C | -2.6°C | 92 mm | 91% | 5.5 m/s | 2.7 |
| 2017 | 0.4°C | -1.6°C | -3.5°C | 4.6°C | -9.6°C | 150 mm | 86% | 6.4 m/s | 2.8 |
| 2016 | 0.3°C | -1.7°C | -3.7°C | 3.7°C | -7.6°C | 108 mm | 82% | 6.1 m/s | 3.2 |
| 2015 | -0.8°C | -3.1°C | -5.3°C | 2.1°C | -11.4°C | 129 mm | 85% | 5.4 m/s | 3.1 |
| 2014 | -1.5°C | -3.8°C | -6.0°C | 4.0°C | -13.8°C | 112 mm | 86% | 5.7 m/s | 3 |
| 2013 | 1.0°C | 0.1°C | -0.9°C | 3.2°C | -5.2°C | 121 mm | 91% | 5.6 m/s | 2.8 |
| 2012 | 0.4°C | -1.2°C | -2.9°C | 6.7°C | -9.1°C | 126 mm | 86% | 5.7 m/s | 2.8 |
| 2011 | 0.8°C | -0.7°C | -2.2°C | 4.5°C | -7.2°C | 98 mm | 86% | 6.4 m/s | 2.8 |
| 2010 | 1.4°C | 0.1°C | -1.2°C | 6.3°C | -4.8°C | 123 mm | 88% | 5.1 m/s | 3 |
| 2009 | 0.5°C | -1.3°C | -3.0°C | 5.1°C | -8.0°C | 137 mm | 87% | 6.1 m/s | 2.9 |
| 2008 🌧️ | -0.2°C | -2.2°C | -4.2°C | 3.7°C | -8.0°C | 185 mm | 86% | 6.1 m/s | 2.6 |
| 2007 | 0.7°C | -1.0°C | -2.7°C | 4.4°C | -8.9°C | 71 mm | 86% | 6.1 m/s | 2.6 |
| 2006 | 0.5°C | -0.8°C | -2.1°C | 1.8°C | -7.3°C | 108 mm | 91% | 5.7 m/s | 2.4 |
| 2005 | 0.0°C | -1.4°C | -2.8°C | 2.7°C | -6.8°C | 156 mm | 87% | 5.3 m/s | 2.7 |
| 2004 | 0.9°C | -0.6°C | -2.1°C | 5.3°C | -4.7°C | 132 mm | 85% | 6 m/s | 2.7 |
| 2003 ❄️ | -1.6°C | -3.9°C | -6.2°C | 4.8°C | -13.2°C | 96 mm | 87% | 6 m/s | 3.1 |
| 2002 | 0.5°C | -1.6°C | -3.7°C | 5.0°C | -9.8°C | 107 mm | 83% | 6.8 m/s | 2.8 |
| 2001 | 0.2°C | -1.1°C | -2.3°C | 3.4°C | -6.4°C | 106 mm | 88% | 6.2 m/s | 2.7 |
| 2000 | 1.6°C | 0.1°C | -1.4°C | 4.9°C | -5.6°C | 142 mm | 90% | 5.4 m/s | 2.5 |
| 1999 🔥 | 2.4°C | 1.0°C | -0.4°C | 6.3°C | -2.9°C | 117 mm | 89% | 5.7 m/s | 2.9 |
| 1998 | 1.1°C | -0.3°C | -1.8°C | 5.1°C | -4.6°C | 93 mm | 87% | 5.2 m/s | 2.6 |
| 1997 | -1.2°C | -3.3°C | -5.4°C | 4.4°C | -12.4°C | 109 mm | 84% | 5.9 m/s | 3 |
| 1996 | 0.5°C | -1.1°C | -2.6°C | 3.7°C | -8.6°C | 69 mm | 85% | 5.3 m/s | 2.8 |
| 1995 | 0.2°C | -1.8°C | -3.8°C | 4.6°C | -9.7°C | 140 mm | 90% | 5.5 m/s | 2.5 |
| 1994 | 0.6°C | -1.6°C | -3.7°C | 7.2°C | -11.0°C | 176 mm | 89% | 5.3 m/s | 2.9 |
| 1993 | -0.1°C | -2.6°C | -5.1°C | 6.9°C | -10.5°C | 127 mm | 87% | 6.2 m/s | 2.9 |
| 1992 | 0.2°C | -2.3°C | -4.7°C | 5.0°C | -13.1°C | 107 mm | 86% | 6.6 m/s | 2.6 |
| 1991 | 0.6°C | -1.3°C | -3.2°C | 5.4°C | -9.4°C | 124 mm | 90% | 6 m/s | 2.4 |
| 1990 | -0.7°C | -3.2°C | -5.6°C | 4.6°C | -13.0°C | 65 mm | 82% | 5.4 m/s | 2.8 |
| 1989 | -0.6°C | -2.9°C | -5.2°C | 4.7°C | -10.8°C | 95 mm | 85% | 6 m/s | 2.8 |
| 1988 | 1.0°C | -0.7°C | -2.4°C | 6.2°C | -6.5°C | 115 mm | 87% | 6 m/s | 2.5 |
| 1987 | -0.7°C | -2.5°C | -4.3°C | 2.4°C | -12.5°C | 106 mm | 91% | 5.6 m/s | 2.7 |
| 1986 | 0.4°C | -2.5°C | -5.4°C | 4.6°C | -18.0°C | 154 mm | 88% | 5.6 m/s | 2.7 |
| 1985 | -1.2°C | -3.6°C | -5.9°C | 3.0°C | -13.6°C | 87 mm | 87% | 5.9 m/s | 3 |
| 1984 | 0.4°C | -0.9°C | -2.3°C | 4.2°C | -7.7°C | 119 mm | 88% | 5.4 m/s | 2.9 |
| 1983 | 0.9°C | -1.3°C | -3.4°C | 5.2°C | -11.9°C | 123 mm | 92% | 5.4 m/s | — |
| 1982 | -0.2°C | -2.3°C | -4.3°C | 6.0°C | -13.3°C | 91 mm | 86% | 5.8 m/s | — |
| 1981 | 1.5°C | 0.4°C | -0.6°C | 3.9°C | -4.3°C | 112 mm | 88% | 5.6 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 0.4°C with lows near -3.2°C (mean -1.4°C), based on 45 years of NASA POWER data.
March averages 114 mm of rainfall in St. John's, about average for rainfall. The wettest on record was 185 mm in 2008.
The hottest March reached 8.5°C in 2022. The coldest dipped to -18°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 1.2°C. Daytime highs moved from 0.3°C to 1.2°C and overnight lows from -3.3°C to -1.9°C over the same span.
March is one of the cooler months of the year in St. John's and about average for rainfall, so plan for around 0.4°C daytime highs and -3.2°C at night.
Not quite — March is the 3rd coolest month in St. John's, averaging -1.4°C.
For March in St. John's, pack warm layers and a jacket for chilly mornings, with typical highs of 0.4°C and lows of -3.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 87% — quite humid.
Average wind speed in March is 5.8 m/s. The windiest March on record averaged 6.8 m/s (2002).
The wettest March on record was 2008 with 185 mm. On average, March sees 114 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 St. John's 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.
