May is one of the warmer months of the year in New Tecumseth, with average highs near 18°C and lows around 5.8°C (mean 11.9°C). It is about average for rainfall, averaging 65 mm of rainfall and 74% relative humidity across the period.
May is one of the warmer months of the year in New Tecumseth. Across 45 years of records, the warmest May in New Tecumseth was 1998 — when the month averaged 15.7°C — while the coldest was 1997 at 7.1°C. Typical May days reach 18°C with nights near 5.8°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in New Tecumseth, averaging 65 mm of rainfall. The wettest May on record was 2000 with 153 mm, while the driest was 1987 at 21 mm.
Relative humidity in New Tecumseth during May averages 74%. The most humid May was 2011 at 86%, and the least humid was 1988 at 61%.
May receives about 5.5 kWh/m²/day of solar energy in New Tecumseth. The sunniest May was 2023 at 6.4 kWh/m²/day, and the cloudiest was 1984 at 4.3.
Average wind speed in New Tecumseth during May is 2.6 m/s. The windiest May was 1997 at 3.2 m/s, while the calmest were 1982, 2007 and 2023 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.2°C | 11.9°C | 10.9°C | 12.5°C | 12.0°C | -0.2°C |
| Avg High | 18.4°C | 18.2°C | 16.8°C | 18.5°C | 18.1°C | -0.3°C |
| Avg Low | 6.0°C | 5.5°C | 5.0°C | 6.5°C | 6.1°C | +0.1°C |
| Avg Rain | 55 mm | 58 mm | 88 mm | 69 mm | 50 mm | -5 mm |
May temperatures in New Tecumseth have risen by about 1.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -4.2°C (1986) to a record high of 31.5°C (1988).
Rainfall in May is about average for rainfall, averaging 65 mm, with a wettest year of 153 mm.
A good time to visit New Tecumseth
May is a good time to visit New Tecumseth, with days averaging 18°C and nights around 5.8°C (mean 11.9°C, warmer than New Tecumseth'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 | 16.7°C | 11.3°C | 5.9°C | 25.8°C | -0.4°C | 74 mm | 77% | 2.9 m/s | 5.3 |
| 2024 | 20.3°C | 14.2°C | 8.2°C | 27.1°C | 3.3°C | 61 mm | 76% | 2.3 m/s | 5.7 |
| 2023 | 18.2°C | 11.6°C | 5.0°C | 29.8°C | -1.1°C | 38 mm | 68% | 2.1 m/s | 6.4 |
| 2022 | 19.2°C | 12.9°C | 6.6°C | 29.4°C | -0.6°C | 57 mm | 76% | 2.4 m/s | 5.9 |
| 2021 | 18.1°C | 11.9°C | 5.7°C | 28.7°C | -2.5°C | 27 mm | 67% | 2.4 m/s | 5.9 |
| 2020 | 15.9°C | 10.4°C | 4.9°C | 29.3°C | -4.0°C | 45 mm | 73% | 2.8 m/s | 5.7 |
| 2019 | 15.7°C | 9.9°C | 4.0°C | 24.8°C | -1.3°C | 75 mm | 84% | 2.6 m/s | 4.7 |
| 2018 | 21.4°C | 14.2°C | 7.0°C | 28.7°C | -0.6°C | 58 mm | 76% | 2.4 m/s | 6.2 |
| 2017 | 14.9°C | 10.2°C | 5.5°C | 25.8°C | -1.1°C | 125 mm | 83% | 2.8 m/s | 4.8 |
| 2016 | 17.9°C | 11.9°C | 5.9°C | 28.4°C | -1.7°C | 42 mm | 76% | 2.2 m/s | 6.2 |
| 2015 | 20.8°C | 14.1°C | 7.3°C | 27.0°C | -1.6°C | 47 mm | 71% | 2.6 m/s | 5.7 |
| 2014 | 17.4°C | 11.8°C | 6.1°C | 24.9°C | 0.2°C | 52 mm | 80% | 2.5 m/s | 5.6 |
| 2013 | 18.7°C | 12.7°C | 6.6°C | 27.5°C | -0.4°C | 79 mm | 77% | 2.6 m/s | 6 |
| 2012 | 21.1°C | 14.5°C | 7.9°C | 31.4°C | 1.4°C | 38 mm | 71% | 2.2 m/s | 5.8 |
| 2011 | 16.8°C | 11.7°C | 6.6°C | 27.9°C | 0.2°C | 105 mm | 86% | 2.5 m/s | 4.5 |
| 2010 | 20.0°C | 13.9°C | 7.8°C | 30.5°C | -1.9°C | 69 mm | 73% | 2.6 m/s | 5.9 |
| 2009 | 17.1°C | 10.6°C | 4.1°C | 24.1°C | -2.0°C | 74 mm | 75% | 2.8 m/s | 5.8 |
| 2008 | 15.1°C | 9.5°C | 3.8°C | 22.5°C | -1.1°C | 83 mm | 77% | 2.9 m/s | 5.5 |
| 2007 | 19.1°C | 12.4°C | 5.7°C | 28.8°C | -0.7°C | 56 mm | 71% | 2.1 m/s | 6 |
| 2006 | 18.3°C | 12.6°C | 6.9°C | 30.6°C | -0.6°C | 67 mm | 76% | 2.6 m/s | 5.2 |
| 2005 | 16.2°C | 10.2°C | 4.3°C | 24.3°C | -2.5°C | 25 mm | 72% | 2.2 m/s | 6 |
| 2004 | 16.6°C | 10.9°C | 5.2°C | 25.5°C | -3.9°C | 118 mm | 84% | 2.7 m/s | 4.7 |
| 2003 | 15.2°C | 10.0°C | 4.7°C | 21.2°C | -0.7°C | 115 mm | 82% | 2.7 m/s | 4.9 |
| 2002 | 14.0°C | 8.4°C | 2.7°C | 24.2°C | -2.5°C | 84 mm | 79% | 3.1 m/s | 5.2 |
| 2001 | 18.5°C | 12.6°C | 6.6°C | 25.3°C | 0.2°C | 101 mm | 75% | 2.7 m/s | 5.7 |
| 2000 🌧️ | 17.6°C | 11.9°C | 6.2°C | 25.4°C | 0.7°C | 153 mm | 81% | 2.8 m/s | 4.8 |
| 1999 | 20.4°C | 13.5°C | 6.7°C | 30.0°C | 1.2°C | 58 mm | 67% | 2.5 m/s | 5.9 |
| 1998 🔥 | 22.2°C | 15.7°C | 9.1°C | 31.0°C | 3.2°C | 35 mm | 68% | 2.5 m/s | 6 |
| 1997 ❄️ | 12.5°C | 7.1°C | 1.6°C | 20.5°C | -2.8°C | 80 mm | 79% | 3.2 m/s | 4.8 |
| 1996 | 16.0°C | 9.8°C | 3.6°C | 26.5°C | -3.0°C | 68 mm | 73% | 2.5 m/s | 5.6 |
| 1995 | 18.7°C | 12.1°C | 5.5°C | 27.3°C | -1.9°C | 36 mm | 65% | 2.9 m/s | 5.5 |
| 1994 | 16.8°C | 10.5°C | 4.2°C | 28.9°C | -1.6°C | 85 mm | 71% | 2.9 m/s | 5.4 |
| 1993 | 18.2°C | 11.8°C | 5.3°C | 28.7°C | 1.0°C | 55 mm | 68% | 2.9 m/s | 5.2 |
| 1992 | 19.1°C | 12.1°C | 5.1°C | 28.4°C | 0.1°C | 35 mm | 65% | 2.3 m/s | 6 |
| 1991 | 21.2°C | 15.1°C | 9.0°C | 28.5°C | -1.4°C | 69 mm | 75% | 2.5 m/s | 5.8 |
| 1990 | 17.1°C | 10.9°C | 4.8°C | 25.3°C | -1.4°C | 58 mm | 66% | 3 m/s | 5.2 |
| 1989 | 18.9°C | 12.7°C | 6.5°C | 28.5°C | -0.3°C | 31 mm | 66% | 2.9 m/s | 5.1 |
| 1988 | 21.5°C | 14.5°C | 7.5°C | 31.5°C | -0.2°C | 31 mm | 61% | 2.6 m/s | 5.8 |
| 1987 | 21.6°C | 14.6°C | 7.6°C | 31.1°C | -1.7°C | 21 mm | 62% | 2.8 m/s | 5.8 |
| 1986 | 19.9°C | 13.9°C | 7.9°C | 28.9°C | -4.2°C | 55 mm | 73% | 2.8 m/s | 5.4 |
| 1985 | 18.0°C | 12.0°C | 6.0°C | 25.5°C | -0.3°C | 68 mm | 78% | 2.7 m/s | 5.4 |
| 1984 | 14.1°C | 8.6°C | 3.1°C | 23.7°C | -2.7°C | 55 mm | 79% | 3 m/s | 4.3 |
| 1983 | 13.9°C | 8.3°C | 2.6°C | 20.0°C | -3.6°C | 102 mm | 81% | 3 m/s | — |
| 1982 | 19.9°C | 13.9°C | 7.8°C | 25.4°C | 2.3°C | 55 mm | 78% | 2.1 m/s | — |
| 1981 | 17.4°C | 11.3°C | 5.1°C | 26.9°C | -2.1°C | 76 mm | 70% | 2.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18°C with lows near 5.8°C (mean 11.9°C), based on 45 years of NASA POWER data.
May averages 65 mm of rainfall in New Tecumseth, about average for rainfall. The wettest on record was 153 mm in 2000.
The hottest May reached 31.5°C in 1988. The coldest dipped to -4.2°C in 1986.
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 16.7°C to 18.5°C and overnight lows from 4.9°C to 6.3°C over the same span.
May is one of the warmer months of the year in New Tecumseth and about average for rainfall, so plan for around 18°C daytime highs and 5.8°C at night.
Not quite — May is the 8th coolest month in New Tecumseth, averaging 11.9°C.
For May in New Tecumseth, pack warm layers and a jacket for chilly mornings, with typical highs of 18°C and lows of 5.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 74% — moderately humid.
Average wind speed in May is 2.6 m/s. The windiest May on record averaged 3.2 m/s (1997).
The wettest May on record was 2000 with 153 mm. On average, May sees 65 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 New Tecumseth 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.
