Niagara-on-the-Lake Weather in May
Average highs run from 15°C on May 1 to 21°C on May 31, and lows from 6°C to 12°C. Normal precipitation for the month is 67 mm over about 12 wet days.
May day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 17°C
- Average low
- 9°C
- Precipitation
- 67 mm
- Record high
- 31°CMay 28, 2012
- Record low
- 0°CMay 9, 2020
- Daylight
- 14 h 08 min to 15 h 09 min
- Cloud cover
- 79%
- Humidity
- 83%
- Dew point
- 7°C
- Wind
- 15.8 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 15°C | 6°C | 25°C 2001 | 3°C 2008 | 41% |
| May 2 | 14°C | 7°C | 25°C 2001 | 4°C 2026 | 43% |
| May 3 | 14°C | 7°C | 27°C 2001 | 4°C 2005 | 43% |
| May 4 | 15°C | 7°C | 26°C 2001 | 2°C 2004 | 42% |
| May 5 | 14°C | 7°C | 25°C 2010 | 3°C 2019 | 42% |
| May 6 | 15°C | 7°C | 28°C 2000 | 4°C 2005 | 43% |
| May 7 | 14°C | 7°C | 24°C 2000 | 4°C 1997 | 44% |
| May 8 | 14°C | 7°C | 26°C 2000 | 1°C 2020 | 44% |
| May 9 | 16°C | 7°C | 26°C 2014 | 0°C 2020 | 43% |
| May 10 | 16°C | 8°C | 25°C 2001 | 4°C 2020 | 43% |
| May 11 | 16°C | 8°C | 26°C 1993 | 3°C 2020 | 42% |
| May 12 | 13°C | 7°C | 25°C 2023 | 3°C 2005 | 42% |
| May 13 | 14°C | 7°C | 23°C 2004 | 3°C 2020 | 43% |
| May 14 | 16°C | 8°C | 27°C 2004 | 5°C 2013 | 44% |
| May 15 | 17°C | 8°C | 28°C 2022 | 5°C 1994 | 45% |
| May 16 | 15°C | 8°C | 25°C 2025 | 5°C 2016 | 45% |
| May 17 | 15°C | 8°C | 28°C 1999 | 2°C 2013 | 45% |
| May 18 | 16°C | 8°C | 29°C 1999 | 5°C 1997 | 44% |
| May 19 | 17°C | 9°C | 28°C 1998 | 4°C 2002 | 44% |
| May 20 | 17°C | 9°C | 27°C 2010 | 4°C 2002 | 43% |
| May 21 | 17°C | 9°C | 29°C 2021 | 5°C 2002 | 42% |
| May 22 | 17°C | 9°C | 28°C 2013 | 5°C 2002 | 43% |
| May 23 | 18°C | 10°C | 24°C 2018 | 5°C 2015 | 42% |
| May 24 | 19°C | 10°C | 29°C 2007 | 6°C 2013 | 43% |
| May 25 | 19°C | 11°C | 30°C 2020 | 7°C 2003 | 44% |
| May 26 | 20°C | 11°C | 29°C 2010 | 7°C 1997 | 46% |
| May 27 | 19°C | 11°C | 29°C 2010 | 7°C 2008 | 47% |
| May 28 | 20°C | 11°C | 31°C 2012 | 6°C 2021 | 46% |
| May 29 | 20°C | 12°C | 29°C 2016 | 7°C 1996 | 46% |
| May 30 | 22°C | 12°C | 30°C 1999 | 7°C 1996 | 46% |
| May 31 | 21°C | 12°C | 30°C 2022 | 7°C 2015 | 46% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 6:10 AM, sunset 8:18 PM
- May 31
- sunrise 5:40 AM, sunset 8:49 PM
Other months
Sources
Records: NOAA GHCN-Daily, station CA006136699, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.