May is one of the warmer months of the year in Sylvan Lake, with average highs near 15.7°C and lows around 3.2°C (mean 9.5°C). It is a relatively wet time of year, averaging 68 mm of rainfall and 66% relative humidity across the period.
May is one of the warmer months of the year in Sylvan Lake. Across 45 years of records, the warmest May in Sylvan Lake was 2023 — when the month averaged 14.6°C — while the coldest was 1996 at 6.3°C. Typical May days reach 15.7°C with nights near 3.2°C. The long-term trend is warming, about 0.2°C per decade.
May is a relatively wet time of year in Sylvan Lake, averaging 68 mm of rainfall. The wettest May on record was 1981 with 123 mm, while the driest was 1988 at 23 mm.
Relative humidity in Sylvan Lake during May averages 66%. The most humid Mays were 1981 and 2007 at 74%, and the least humid was 1988 at 51%.
May receives about 5.5 kWh/m²/day of solar energy in Sylvan Lake. The sunniest May was 2015 at 6.2 kWh/m²/day, and the cloudiest was 2010 at 4.8.
Average wind speed in Sylvan Lake during May is 2.5 m/s. The windiest May was 2001 at 3.1 m/s, while the calmest was 2014 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.5°C | 9.4°C | 8.7°C | 9.7°C | 10.1°C | +0.6°C |
| Avg High | 15.8°C | 15.7°C | 15.0°C | 15.9°C | 16.5°C | +0.7°C |
| Avg Low | 3.1°C | 3.2°C | 2.6°C | 3.5°C | 3.7°C | +0.6°C |
| Avg Rain | 62 mm | 70 mm | 68 mm | 70 mm | 69 mm | +8 mm |
May temperatures in Sylvan Lake have risen by about 1.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -7.1°C (2004) to a record high of 30.6°C (1986).
Rainfall in May is a relatively wet time of year, averaging 68 mm, with a wettest year of 123 mm.
A good time to visit Sylvan Lake
May is a good time to visit Sylvan Lake, with days averaging 15.7°C and nights around 3.2°C (mean 9.5°C, warmer than Sylvan Lake's yearly average) and moderate rainfall. August and July 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 | 18.1°C | 11.2°C | 4.3°C | 29.2°C | -0.5°C | 99 mm | 70% | 2.5 m/s | 5.7 |
| 2024 | 14.5°C | 8.7°C | 2.9°C | 25.7°C | -2.5°C | 87 mm | 70% | 2.8 m/s | 5.1 |
| 2023 🔥 | 22.0°C | 14.6°C | 7.3°C | 28.6°C | 3.0°C | 42 mm | 62% | 2.4 m/s | 6 |
| 2022 | 14.8°C | 8.6°C | 2.4°C | 21.6°C | -2.0°C | 33 mm | 66% | 2.3 m/s | 5.4 |
| 2021 | 15.0°C | 8.9°C | 2.7°C | 23.6°C | -3.1°C | 72 mm | 67% | 2.5 m/s | 5.3 |
| 2020 | 14.8°C | 8.6°C | 2.4°C | 24.2°C | -3.3°C | 83 mm | 70% | 2.7 m/s | 5.2 |
| 2019 | 14.5°C | 8.6°C | 2.8°C | 25.5°C | -4.2°C | 59 mm | 70% | 2.3 m/s | 5.2 |
| 2018 | 19.4°C | 12.9°C | 6.4°C | 27.1°C | 1.2°C | 80 mm | 67% | 2.5 m/s | 6 |
| 2017 | 17.5°C | 11.3°C | 5.1°C | 26.3°C | -1.2°C | 70 mm | 69% | 2.5 m/s | 5.8 |
| 2016 | 16.6°C | 10.0°C | 3.4°C | 26.7°C | -2.3°C | 105 mm | 64% | 2.6 m/s | 5.6 |
| 2015 | 16.3°C | 9.3°C | 2.3°C | 24.7°C | -3.9°C | 34 mm | 59% | 2.7 m/s | 6.2 |
| 2014 | 13.6°C | 8.2°C | 2.7°C | 23.8°C | -4.7°C | 70 mm | 71% | 2.1 m/s | 5.2 |
| 2013 | 17.7°C | 11.2°C | 4.8°C | 27.7°C | -5.8°C | 88 mm | 65% | 2.4 m/s | 5.6 |
| 2012 | 15.1°C | 8.9°C | 2.6°C | 25.9°C | -2.3°C | 45 mm | 63% | 2.4 m/s | 5.6 |
| 2011 | 15.3°C | 9.0°C | 2.8°C | 21.4°C | -2.2°C | 62 mm | 66% | 2.6 m/s | 5.5 |
| 2010 | 12.9°C | 7.4°C | 2.0°C | 26.8°C | -3.6°C | 87 mm | 65% | 2.5 m/s | 4.8 |
| 2009 | 15.0°C | 8.1°C | 1.3°C | 26.2°C | -4.9°C | 43 mm | 62% | 2.5 m/s | 5.8 |
| 2008 | 15.4°C | 9.4°C | 3.3°C | 25.6°C | -4.6°C | 86 mm | 71% | 2.6 m/s | 5.2 |
| 2007 | 14.6°C | 8.5°C | 2.4°C | 22.7°C | -1.4°C | 114 mm | 74% | 2.7 m/s | 5.4 |
| 2006 | 17.1°C | 10.8°C | 4.5°C | 29.5°C | -3.4°C | 57 mm | 65% | 2.5 m/s | 5.8 |
| 2005 | 16.1°C | 9.7°C | 3.4°C | 21.9°C | -5.3°C | 69 mm | 67% | 2.6 m/s | 6 |
| 2004 | 13.5°C | 7.6°C | 1.8°C | 23.3°C | -7.1°C | 63 mm | 66% | 2.4 m/s | 5 |
| 2003 | 13.2°C | 7.7°C | 2.2°C | 25.2°C | -5.1°C | 72 mm | 73% | 2.5 m/s | 5 |
| 2002 | 12.6°C | 6.4°C | 0.3°C | 21.8°C | -6.7°C | 80 mm | 67% | 2.7 m/s | 5.1 |
| 2001 | 17.8°C | 11.1°C | 4.3°C | 28.0°C | -2.3°C | 36 mm | 54% | 3.1 m/s | 5.7 |
| 2000 | 14.2°C | 8.1°C | 2.0°C | 22.0°C | -2.2°C | 64 mm | 65% | 2.4 m/s | 5.4 |
| 1999 | 14.1°C | 8.3°C | 2.5°C | 26.7°C | -3.4°C | 54 mm | 65% | 2.4 m/s | 5.4 |
| 1998 | 20.0°C | 13.1°C | 6.2°C | 25.7°C | 1.5°C | 55 mm | 59% | 2.4 m/s | 5.8 |
| 1997 | 15.0°C | 8.8°C | 2.6°C | 24.4°C | -3.9°C | 78 mm | 69% | 2.5 m/s | 5.4 |
| 1996 ❄️ | 11.6°C | 6.3°C | 1.0°C | 22.7°C | -6.9°C | 59 mm | 74% | 2.2 m/s | 5 |
| 1995 | 16.3°C | 9.5°C | 2.7°C | 29.0°C | -2.9°C | 58 mm | 64% | 2.3 m/s | 5.4 |
| 1994 | 16.7°C | 10.4°C | 4.2°C | 26.0°C | -1.7°C | 78 mm | 65% | 2.5 m/s | 5 |
| 1993 | 18.3°C | 11.5°C | 4.7°C | 29.6°C | -1.5°C | 49 mm | 63% | 2.8 m/s | 5.5 |
| 1992 | 15.1°C | 8.6°C | 2.1°C | 27.3°C | -4.2°C | 104 mm | 67% | 2.4 m/s | 5.4 |
| 1991 | 15.1°C | 9.3°C | 3.4°C | 23.0°C | -4.0°C | 87 mm | 68% | 2.4 m/s | 5.4 |
| 1990 | 14.4°C | 8.6°C | 2.7°C | 23.3°C | -3.3°C | 75 mm | 72% | 2.4 m/s | 5 |
| 1989 | 15.3°C | 8.9°C | 2.4°C | 24.0°C | -1.6°C | 58 mm | 63% | 2.5 m/s | 5.4 |
| 1988 | 19.5°C | 12.2°C | 4.9°C | 30.0°C | -2.9°C | 23 mm | 51% | 2.6 m/s | 5.7 |
| 1987 | 17.9°C | 10.6°C | 3.3°C | 27.5°C | -6.4°C | 46 mm | 60% | 2.4 m/s | 5.8 |
| 1986 | 15.9°C | 9.6°C | 3.3°C | 30.6°C | -6.0°C | 71 mm | 71% | 2.5 m/s | 5.4 |
| 1985 | 16.8°C | 10.5°C | 4.2°C | 25.7°C | -2.1°C | 49 mm | 64% | 2.4 m/s | 6 |
| 1984 | 12.7°C | 7.0°C | 1.4°C | 22.4°C | -3.5°C | 83 mm | 71% | 2.7 m/s | 5 |
| 1983 | 14.9°C | 8.8°C | 2.7°C | 24.5°C | -4.0°C | 43 mm | 72% | 2.5 m/s | — |
| 1982 | 14.4°C | 7.8°C | 1.3°C | 25.0°C | -3.1°C | 58 mm | 67% | 2.8 m/s | — |
| 1981 🌧️ | 15.1°C | 9.7°C | 4.3°C | 21.8°C | -1.5°C | 123 mm | 74% | 2.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 15.7°C with lows near 3.2°C (mean 9.5°C), based on 45 years of NASA POWER data.
May averages 68 mm of rainfall in Sylvan Lake, a relatively wet time of year. The wettest on record was 123 mm in 1981.
The hottest May reached 30.6°C in 1986. The coldest dipped to -7.1°C in 2004.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.6°C. Daytime highs moved from 14.8°C to 16.9°C and overnight lows from 2.8°C to 3.9°C over the same span.
May is one of the warmer months of the year in Sylvan Lake and a relatively wet time of year, so plan for around 15.7°C daytime highs and 3.2°C at night.
Not quite — May is the 8th coolest month in Sylvan Lake, averaging 9.5°C.
For May in Sylvan Lake, pack warm layers and a jacket for chilly mornings, with typical highs of 15.7°C and lows of 3.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 66% — moderately humid.
Average wind speed in May is 2.5 m/s. The windiest May on record averaged 3.1 m/s (2001).
The wettest May on record was 1981 with 123 mm. On average, May sees 68 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 Sylvan Lake 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.
