May is one of the warmer months of the year in Kawartha Lakes, with average highs near 18.2°C and lows around 6.2°C (mean 12.2°C). It is about average for rainfall, averaging 55 mm of rainfall and 73% relative humidity across the period.
May is one of the warmer months of the year in Kawartha Lakes. Across 45 years of records, the warmest May in Kawartha Lakes was 1998 — when the month averaged 15.7°C — while the coldest was 1997 at 7.9°C. Typical May days reach 18.2°C with nights near 6.2°C. The long-term trend is warming, about 0.4°C per decade.
May is about average for rainfall in Kawartha Lakes, averaging 55 mm of rainfall. The wettest May on record was 2002 with 161 mm, while the driest was 2021 at 11 mm.
Relative humidity in Kawartha Lakes during May averages 73%. The most humid May was 2004 at 83%, and the least humid was 2021 at 61%.
May receives about 5.5 kWh/m²/day of solar energy in Kawartha Lakes. The sunniest May was 2023 at 6.5 kWh/m²/day, and the cloudiest was 1984 at 4.2.
Average wind speed in Kawartha Lakes during May is 1.9 m/s. The windiest May was 1997 at 2.3 m/s, while the calmest were 1982 and 2007 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.2°C | 11.8°C | 11.1°C | 13.2°C | 13.1°C | +0.9°C |
| Avg High | 18.0°C | 17.9°C | 16.9°C | 19.4°C | 19.4°C | +1.4°C |
| Avg Low | 6.3°C | 5.8°C | 5.4°C | 7.1°C | 6.8°C | +0.5°C |
| Avg Rain | 54 mm | 61 mm | 77 mm | 44 mm | 28 mm | -25 mm |
May temperatures in Kawartha Lakes have risen by about 2.7°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -3.7°C (2020) to a record high of 32°C (2012).
Rainfall in May is about average for rainfall, averaging 55 mm, with a wettest year of 161 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A good time to visit Kawartha Lakes
May is a good time to visit Kawartha Lakes, with days averaging 18.2°C and nights around 6.2°C (mean 12.2°C, warmer than Kawartha Lakes's yearly average) and moderate 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 | 18.4°C | 12.6°C | 6.8°C | 27.2°C | 0.9°C | 57 mm | 71% | 2.1 m/s | 5.2 |
| 2024 | 21.5°C | 15.5°C | 9.5°C | 29.0°C | 4.7°C | 30 mm | 70% | 1.8 m/s | 5.5 |
| 2023 | 19.4°C | 12.6°C | 5.7°C | 31.3°C | -0.6°C | 20 mm | 63% | 1.7 m/s | 6.5 |
| 2022 | 20.9°C | 14.3°C | 7.6°C | 30.2°C | 0.8°C | 30 mm | 67% | 1.9 m/s | 5.7 |
| 2021 | 19.3°C | 12.6°C | 6.0°C | 29.7°C | -3.2°C | 11 mm | 61% | 1.9 m/s | 5.9 |
| 2020 | 17.1°C | 11.2°C | 5.4°C | 30.3°C | -3.7°C | 21 mm | 68% | 2 m/s | 5.8 |
| 2019 | 15.6°C | 10.1°C | 4.7°C | 21.0°C | -0.4°C | 59 mm | 79% | 1.9 m/s | 4.6 |
| 2018 | 21.6°C | 14.6°C | 7.7°C | 29.5°C | -0.3°C | 38 mm | 71% | 1.8 m/s | 6.1 |
| 2017 | 15.8°C | 11.0°C | 6.2°C | 26.1°C | -0.7°C | 96 mm | 80% | 2 m/s | 4.7 |
| 2016 | 18.8°C | 12.6°C | 6.4°C | 28.9°C | 0.0°C | 23 mm | 72% | 1.7 m/s | 6.1 |
| 2015 | 21.4°C | 14.7°C | 8.0°C | 27.7°C | -0.4°C | 28 mm | 66% | 2.1 m/s | 5.7 |
| 2014 | 18.8°C | 12.7°C | 6.6°C | 26.1°C | 0.4°C | 34 mm | 73% | 1.8 m/s | 5.5 |
| 2013 | 20.2°C | 13.8°C | 7.3°C | 28.4°C | 0.3°C | 43 mm | 69% | 1.9 m/s | 6.1 |
| 2012 | 22.2°C | 15.4°C | 8.6°C | 32.0°C | 2.1°C | 26 mm | 64% | 1.8 m/s | 5.9 |
| 2011 | 18.3°C | 12.7°C | 7.1°C | 28.0°C | 0.0°C | 52 mm | 80% | 1.9 m/s | 4.5 |
| 2010 | 21.0°C | 14.7°C | 8.3°C | 31.6°C | -1.6°C | 41 mm | 68% | 1.9 m/s | 6 |
| 2009 | 16.7°C | 10.7°C | 4.7°C | 23.5°C | -1.1°C | 55 mm | 76% | 2.1 m/s | 5.8 |
| 2008 | 15.3°C | 9.8°C | 4.4°C | 21.6°C | -0.3°C | 78 mm | 76% | 2.1 m/s | 5.5 |
| 2007 | 19.0°C | 12.3°C | 5.7°C | 28.2°C | -0.2°C | 49 mm | 71% | 1.6 m/s | 6.1 |
| 2006 | 18.8°C | 13.2°C | 7.6°C | 31.4°C | 0.0°C | 52 mm | 75% | 1.9 m/s | 5.3 |
| 2005 | 16.6°C | 10.5°C | 4.5°C | 24.4°C | -2.3°C | 12 mm | 71% | 1.7 m/s | 5.8 |
| 2004 | 16.8°C | 11.3°C | 5.7°C | 24.6°C | -2.9°C | 107 mm | 83% | 1.9 m/s | 4.8 |
| 2003 | 15.7°C | 10.6°C | 5.5°C | 20.4°C | -0.3°C | 78 mm | 81% | 1.9 m/s | 4.9 |
| 2002 🌧️ | 14.0°C | 8.6°C | 3.1°C | 23.4°C | -2.2°C | 161 mm | 81% | 2.2 m/s | 5.2 |
| 2001 | 18.3°C | 12.6°C | 7.0°C | 24.7°C | 0.1°C | 90 mm | 78% | 1.9 m/s | 5.6 |
| 2000 | 17.5°C | 11.8°C | 6.2°C | 25.1°C | 0.3°C | 87 mm | 80% | 2 m/s | 4.8 |
| 1999 | 20.0°C | 13.7°C | 7.4°C | 28.7°C | 1.4°C | 60 mm | 70% | 1.8 m/s | 6 |
| 1998 🔥 | 21.9°C | 15.7°C | 9.4°C | 29.5°C | 3.6°C | 34 mm | 70% | 1.8 m/s | 5.9 |
| 1997 ❄️ | 13.2°C | 7.9°C | 2.5°C | 21.4°C | -2.7°C | 52 mm | 76% | 2.3 m/s | 4.9 |
| 1996 | 16.2°C | 10.1°C | 4.0°C | 25.3°C | -1.5°C | 55 mm | 71% | 1.8 m/s | 5.7 |
| 1995 | 18.7°C | 12.1°C | 5.5°C | 27.4°C | -2.2°C | 35 mm | 66% | 2.1 m/s | 5.5 |
| 1994 | 16.4°C | 10.5°C | 4.6°C | 26.8°C | -1.1°C | 113 mm | 74% | 2 m/s | 5.4 |
| 1993 | 17.9°C | 11.6°C | 5.4°C | 27.4°C | 0.1°C | 72 mm | 73% | 2 m/s | 5.3 |
| 1992 | 18.1°C | 11.8°C | 5.6°C | 27.4°C | 0.3°C | 43 mm | 69% | 1.7 m/s | 6.1 |
| 1991 | 20.3°C | 14.4°C | 8.5°C | 27.0°C | -1.2°C | 73 mm | 78% | 1.8 m/s | 5.6 |
| 1990 | 15.9°C | 10.3°C | 4.8°C | 24.4°C | -2.3°C | 70 mm | 72% | 2.1 m/s | 4.8 |
| 1989 | 18.6°C | 12.8°C | 7.1°C | 28.1°C | 0.3°C | 40 mm | 70% | 2 m/s | 5 |
| 1988 | 20.9°C | 14.2°C | 7.5°C | 30.0°C | -0.2°C | 37 mm | 64% | 1.9 m/s | 5.5 |
| 1987 | 21.2°C | 14.4°C | 7.7°C | 30.8°C | -1.5°C | 22 mm | 62% | 2.1 m/s | 5.7 |
| 1986 | 20.0°C | 14.1°C | 8.2°C | 27.8°C | -3.3°C | 34 mm | 71% | 2 m/s | 5.6 |
| 1985 | 17.6°C | 11.8°C | 6.0°C | 23.7°C | -2.2°C | 62 mm | 78% | 1.9 m/s | 5.4 |
| 1984 | 13.9°C | 8.8°C | 3.7°C | 22.9°C | -1.9°C | 53 mm | 79% | 2.2 m/s | 4.2 |
| 1983 | 14.0°C | 8.7°C | 3.5°C | 21.0°C | -3.3°C | 100 mm | 81% | 2.1 m/s | — |
| 1982 | 19.3°C | 13.7°C | 8.1°C | 24.1°C | 1.5°C | 50 mm | 78% | 1.6 m/s | — |
| 1981 | 16.7°C | 10.9°C | 5.1°C | 24.7°C | -2.2°C | 83 mm | 76% | 1.8 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.2°C with lows near 6.2°C (mean 12.2°C), based on 45 years of NASA POWER data.
May averages 55 mm of rainfall in Kawartha Lakes, about average for rainfall. The wettest on record was 161 mm in 2002.
The hottest May reached 32°C in 2012. The coldest dipped to -3.7°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.7°C. Daytime highs moved from 16.3°C to 19.9°C and overnight lows from 5.3°C to 7.1°C over the same span.
May is one of the warmer months of the year in Kawartha Lakes and about average for rainfall, so plan for around 18.2°C daytime highs and 6.2°C at night.
Not quite — May is the 8th coolest month in Kawartha Lakes, averaging 12.2°C.
For May in Kawartha Lakes, pack warm layers and a jacket for chilly mornings, with typical highs of 18.2°C and lows of 6.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 73% — moderately humid.
Average wind speed in May is 1.9 m/s. The windiest May on record averaged 2.3 m/s (1997).
The wettest May on record was 2002 with 161 mm. On average, May sees 55 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 Kawartha Lakes 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.
