May is one of the warmer months of the year in Fredericton, with average highs near 16°C and lows around 4.6°C (mean 10.3°C). It is about average for rainfall, averaging 96 mm of rainfall and 81% relative humidity across the period.
May is one of the warmer months of the year in Fredericton. Across 45 years of records, the warmest May in Fredericton was 1999 — when the month averaged 13°C — while the coldest was 2005 at 7.9°C. Typical May days reach 16°C with nights near 4.6°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Fredericton, averaging 96 mm of rainfall. The wettest May on record was 1990 with 176 mm, while the driest was 1982 at 19 mm.
Relative humidity in Fredericton during May averages 81%. The most humid May was 2011 at 87%, and the least humid was 1987 at 76%.
May receives about 5.1 kWh/m²/day of solar energy in Fredericton. The sunniest May was 2018 at 6.4 kWh/m²/day, and the cloudiest were 2005 and 2011 at 4.
Average wind speed in Fredericton during May is 0.2 m/s. The windiest Mays were 2022, 2023 and 2025, among others at 0.2 m/s, while the calmest were 2014, 2015 and 2024, among others at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.4°C | 10.1°C | 10.0°C | 10.5°C | 10.7°C | +0.3°C |
| Avg High | 16.1°C | 15.8°C | 15.6°C | 16.0°C | 16.6°C | +0.5°C |
| Avg Low | 4.6°C | 4.3°C | 4.5°C | 5.0°C | 4.8°C | +0.2°C |
| Avg Rain | 105 mm | 101 mm | 92 mm | 105 mm | 66 mm | -39 mm |
May temperatures in Fredericton have risen by about 1.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -4.5°C (1987) to a record high of 28.8°C (1992).
Rainfall in May is about average for rainfall, averaging 96 mm, with a wettest year of 176 mm.
A good time to visit Fredericton
May is a good time to visit Fredericton, with days averaging 16°C and nights around 4.6°C (mean 10.3°C, warmer than Fredericton's yearly average) and higher rainfall. July and August are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.7°C | 10.4°C | 5.2°C | 25.2°C | -2.6°C | 95 mm | 82% | 0.2 m/s | 4.4 |
| 2024 | 17.8°C | 12.0°C | 6.2°C | 24.5°C | -1.5°C | 42 mm | 82% | 0.1 m/s | 5.3 |
| 2023 | 16.2°C | 10.0°C | 3.8°C | 28.3°C | -1.1°C | 62 mm | 77% | 0.2 m/s | 5.8 |
| 2022 | 17.9°C | 11.4°C | 5.0°C | 26.1°C | -3.4°C | 55 mm | 78% | 0.2 m/s | 6.1 |
| 2021 | 16.6°C | 10.6°C | 4.5°C | 27.9°C | -0.7°C | 65 mm | 77% | 0.2 m/s | 5.5 |
| 2020 | 15.5°C | 9.7°C | 3.9°C | 27.9°C | -0.7°C | 78 mm | 79% | 0.2 m/s | 5.9 |
| 2019 | 13.6°C | 8.3°C | 3.0°C | 21.1°C | -2.9°C | 89 mm | 81% | 0.2 m/s | 4.8 |
| 2018 | 17.4°C | 10.6°C | 3.9°C | 25.9°C | -2.9°C | 80 mm | 78% | 0.2 m/s | 6.4 |
| 2017 | 14.9°C | 9.8°C | 4.7°C | 27.4°C | 0.7°C | 158 mm | 84% | 0.2 m/s | 4.6 |
| 2016 | 16.2°C | 10.7°C | 5.1°C | 25.0°C | -0.1°C | 70 mm | 82% | 0.2 m/s | 5 |
| 2015 | 17.6°C | 11.8°C | 5.9°C | 26.7°C | -1.3°C | 91 mm | 81% | 0.1 m/s | 5.4 |
| 2014 | 14.8°C | 9.7°C | 4.5°C | 21.1°C | 0.6°C | 97 mm | 84% | 0.1 m/s | 4.8 |
| 2013 | 16.4°C | 10.9°C | 5.4°C | 27.3°C | 0.0°C | 139 mm | 84% | 0.1 m/s | 5 |
| 2012 | 16.6°C | 11.3°C | 6.0°C | 25.3°C | 0.3°C | 110 mm | 83% | 0.2 m/s | 4.8 |
| 2011 | 14.8°C | 10.2°C | 5.6°C | 23.0°C | -1.7°C | 150 mm | 87% | 0.1 m/s | 4 |
| 2010 | 17.3°C | 11.6°C | 5.8°C | 26.7°C | -0.6°C | 64 mm | 78% | 0.2 m/s | 5.8 |
| 2009 | 15.8°C | 10.4°C | 5.0°C | 25.0°C | 1.3°C | 96 mm | 81% | 0.2 m/s | 5 |
| 2008 | 15.2°C | 9.7°C | 4.2°C | 23.2°C | -2.7°C | 45 mm | 80% | 0.2 m/s | 5.6 |
| 2007 | 15.5°C | 9.8°C | 4.1°C | 28.5°C | -1.1°C | 80 mm | 81% | 0.1 m/s | 5.2 |
| 2006 | 17.6°C | 12.1°C | 6.6°C | 24.7°C | 0.4°C | 125 mm | 83% | 0.2 m/s | 4.8 |
| 2005 ❄️ | 12.3°C | 7.9°C | 3.5°C | 20.2°C | -2.1°C | 153 mm | 84% | 0.2 m/s | 4 |
| 2004 | 16.1°C | 10.0°C | 4.0°C | 25.2°C | -3.2°C | 61 mm | 79% | 0.1 m/s | 4.9 |
| 2003 | 15.6°C | 9.8°C | 4.1°C | 27.1°C | -3.2°C | 97 mm | 81% | 0.2 m/s | 4.7 |
| 2002 | 14.9°C | 9.3°C | 3.8°C | 23.3°C | -1.9°C | 85 mm | 78% | 0.2 m/s | 5.4 |
| 2001 | 18.2°C | 11.9°C | 5.5°C | 26.6°C | -1.4°C | 74 mm | 80% | 0.1 m/s | 5.6 |
| 2000 | 14.6°C | 9.3°C | 4.0°C | 20.2°C | -2.0°C | 100 mm | 81% | 0.2 m/s | 5.1 |
| 1999 🔥 | 19.6°C | 13.0°C | 6.4°C | 26.6°C | -1.0°C | 49 mm | 78% | 0.2 m/s | 6 |
| 1998 | 18.9°C | 12.8°C | 6.7°C | 25.9°C | 0.0°C | 84 mm | 82% | 0.1 m/s | 5.4 |
| 1997 | 13.6°C | 8.5°C | 3.5°C | 20.4°C | -2.0°C | 125 mm | 82% | 0.2 m/s | 4.8 |
| 1996 | 14.0°C | 8.5°C | 3.0°C | 21.6°C | -3.3°C | 122 mm | 80% | 0.2 m/s | 5 |
| 1995 | 15.4°C | 9.8°C | 4.1°C | 20.9°C | -2.2°C | 86 mm | 81% | 0.2 m/s | 4.8 |
| 1994 | 14.0°C | 8.9°C | 3.7°C | 26.2°C | -2.5°C | 146 mm | 83% | 0.2 m/s | 4.9 |
| 1993 | 15.8°C | 10.4°C | 4.9°C | 20.9°C | -1.1°C | 100 mm | 81% | 0.2 m/s | 4.8 |
| 1992 | 16.5°C | 9.8°C | 3.2°C | 28.8°C | -3.9°C | 29 mm | 77% | 0.1 m/s | 6.1 |
| 1991 | 16.9°C | 10.8°C | 4.7°C | 24.5°C | -1.6°C | 96 mm | 81% | 0.2 m/s | 5.4 |
| 1990 🌧️ | 13.4°C | 8.3°C | 3.1°C | 23.4°C | -1.2°C | 176 mm | 83% | 0.1 m/s | 4.8 |
| 1989 | 18.4°C | 12.8°C | 7.2°C | 25.0°C | 2.2°C | 139 mm | 84% | 0.2 m/s | 4.4 |
| 1988 | 17.2°C | 11.1°C | 5.0°C | 25.0°C | -2.0°C | 79 mm | 80% | 0.2 m/s | 5.1 |
| 1987 | 16.8°C | 10.4°C | 4.0°C | 25.9°C | -4.5°C | 69 mm | 76% | 0.2 m/s | 5.7 |
| 1986 | 16.1°C | 10.1°C | 4.1°C | 26.3°C | -4.2°C | 83 mm | 79% | 0.2 m/s | 5.2 |
| 1985 | 15.0°C | 9.0°C | 2.9°C | 22.8°C | -3.7°C | 125 mm | 81% | 0.2 m/s | 5.5 |
| 1984 | 14.8°C | 9.7°C | 4.6°C | 23.4°C | 0.1°C | 154 mm | 83% | 0.2 m/s | 4.3 |
| 1983 | 14.1°C | 9.5°C | 4.8°C | 20.1°C | -2.6°C | 160 mm | 85% | 0.2 m/s | — |
| 1982 | 16.3°C | 10.0°C | 3.7°C | 24.4°C | -1.8°C | 19 mm | 79% | 0.2 m/s | — |
| 1981 | 16.5°C | 10.8°C | 5.1°C | 23.6°C | -2.6°C | 118 mm | 83% | 0.2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16°C with lows near 4.6°C (mean 10.3°C), based on 45 years of NASA POWER data.
May averages 96 mm of rainfall in Fredericton, about average for rainfall. The wettest on record was 176 mm in 1990.
The hottest May reached 28.8°C in 1992. The coldest dipped to -4.5°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.1°C. Daytime highs moved from 15.3°C to 16.8°C and overnight lows from 4.2°C to 4.9°C over the same span.
May is one of the warmer months of the year in Fredericton and about average for rainfall, so plan for around 16°C daytime highs and 4.6°C at night.
Not quite — May is the 8th coolest month in Fredericton, averaging 10.3°C.
For May in Fredericton, pack warm layers and a jacket for chilly mornings, with typical highs of 16°C and lows of 4.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 81% — quite humid.
Average wind speed in May is 0.2 m/s. The windiest May on record averaged 0.2 m/s (1981).
The wettest May on record was 1990 with 176 mm. On average, May sees 96 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 Fredericton behaves each May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
