May is one of the warmer months of the year in Brandon, with average highs near 18.1°C and lows around 4.9°C (mean 11.5°C). It is a relatively wet time of year, averaging 69 mm of rainfall and 63% relative humidity across the period.
May is one of the warmer months of the year in Brandon. Across 45 years of records, the warmest May in Brandon was 2018 — when the month averaged 15.8°C — while the coldest was 2004 at 7.8°C. Typical May days reach 18.1°C with nights near 4.9°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Brandon, averaging 69 mm of rainfall. The wettest May on record was 1999 with 169 mm, while the driest was 2002 at 18 mm.
Relative humidity in Brandon during May averages 63%. The most humid May was 2022 at 74%, and the least humid was 1989 at 52%.
May receives about 5.7 kWh/m²/day of solar energy in Brandon. The sunniest May was 2018 at 6.3 kWh/m²/day, and the cloudiest was 2022 at 4.9.
Average wind speed in Brandon during May is 3.4 m/s. The windiest Mays were 1999, 2010 and 2011, among others at 3.9 m/s, while the calmest was 1996 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.0°C | 11.2°C | 10.5°C | 11.8°C | 12.1°C | +0.1°C |
| Avg High | 18.9°C | 18.0°C | 17.0°C | 18.2°C | 18.5°C | -0.4°C |
| Avg Low | 5.0°C | 4.5°C | 4.1°C | 5.4°C | 5.6°C | +0.6°C |
| Avg Rain | 51 mm | 68 mm | 77 mm | 78 mm | 70 mm | +19 mm |
May temperatures in Brandon have risen by about 1.8°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -8.5°C (1984) to a record high of 33.3°C (1988).
Rainfall in May is a relatively wet time of year, averaging 69 mm, with a wettest year of 169 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Brandon
May is a good time to visit Brandon, with days averaging 18.1°C and nights around 4.9°C (mean 11.5°C, warmer than Brandon'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 | 20.9°C | 13.6°C | 6.2°C | 32.6°C | -1.1°C | 55 mm | 59% | 3.3 m/s | 6.2 |
| 2024 | 16.9°C | 11.2°C | 5.5°C | 26.2°C | 1.0°C | 120 mm | 71% | 3.4 m/s | 5 |
| 2023 | 21.9°C | 15.4°C | 8.8°C | 29.7°C | -2.0°C | 33 mm | 65% | 3.2 m/s | 5.8 |
| 2022 | 16.3°C | 10.4°C | 4.5°C | 23.7°C | -2.6°C | 144 mm | 74% | 3.7 m/s | 4.9 |
| 2021 | 18.2°C | 11.3°C | 4.4°C | 29.6°C | -3.2°C | 33 mm | 55% | 3.3 m/s | 6.1 |
| 2020 | 17.0°C | 10.7°C | 4.3°C | 26.8°C | -4.5°C | 33 mm | 65% | 3.3 m/s | 6.1 |
| 2019 | 16.8°C | 10.0°C | 3.2°C | 30.0°C | -3.6°C | 39 mm | 58% | 3.2 m/s | 6.2 |
| 2018 🔥 | 23.4°C | 15.8°C | 8.1°C | 31.0°C | -1.5°C | 31 mm | 53% | 3.3 m/s | 6.3 |
| 2017 | 18.3°C | 11.9°C | 5.5°C | 24.6°C | -1.1°C | 35 mm | 63% | 3.6 m/s | 5.9 |
| 2016 | 20.0°C | 13.7°C | 7.3°C | 32.1°C | -1.2°C | 82 mm | 60% | 3.5 m/s | 5.7 |
| 2015 | 17.9°C | 11.2°C | 4.4°C | 27.8°C | -2.0°C | 62 mm | 59% | 3.3 m/s | 5.7 |
| 2014 | 17.3°C | 10.9°C | 4.5°C | 29.8°C | -3.5°C | 82 mm | 69% | 3.2 m/s | 5.5 |
| 2013 | 17.5°C | 11.3°C | 5.2°C | 27.7°C | -5.4°C | 97 mm | 64% | 3.8 m/s | 5.3 |
| 2012 | 18.2°C | 12.0°C | 5.8°C | 28.4°C | 1.0°C | 81 mm | 64% | 3.6 m/s | 5.4 |
| 2011 | 15.7°C | 10.1°C | 4.4°C | 23.0°C | -4.6°C | 131 mm | 70% | 3.9 m/s | 5.1 |
| 2010 | 16.4°C | 11.0°C | 5.6°C | 27.2°C | -2.7°C | 138 mm | 68% | 3.9 m/s | 5.1 |
| 2009 | 15.6°C | 8.8°C | 2.0°C | 24.4°C | -5.2°C | 40 mm | 65% | 3.3 m/s | 5.8 |
| 2008 | 16.3°C | 9.6°C | 2.9°C | 23.7°C | -3.9°C | 72 mm | 59% | 3.3 m/s | 6.1 |
| 2007 | 18.0°C | 11.7°C | 5.4°C | 27.8°C | -0.9°C | 123 mm | 70% | 3.7 m/s | 5 |
| 2006 | 19.2°C | 12.6°C | 6.0°C | 31.9°C | -1.6°C | 74 mm | 67% | 3.4 m/s | 5.4 |
| 2005 | 16.0°C | 10.2°C | 4.3°C | 25.0°C | -5.1°C | 92 mm | 67% | 3.8 m/s | 5.2 |
| 2004 ❄️ | 13.9°C | 7.8°C | 1.7°C | 23.6°C | -6.5°C | 137 mm | 65% | 3.6 m/s | 5.1 |
| 2003 | 19.6°C | 12.8°C | 6.0°C | 27.7°C | -1.7°C | 45 mm | 56% | 3.5 m/s | 5.7 |
| 2002 | 15.9°C | 8.6°C | 1.3°C | 28.9°C | -6.0°C | 18 mm | 53% | 3.7 m/s | 6.2 |
| 2001 | 18.2°C | 12.1°C | 6.0°C | 28.1°C | -1.1°C | 91 mm | 66% | 3.6 m/s | 5.6 |
| 2000 | 17.6°C | 11.2°C | 4.9°C | 28.4°C | -2.2°C | 79 mm | 62% | 3.4 m/s | 5.5 |
| 1999 🌧️ | 16.8°C | 11.0°C | 5.2°C | 28.5°C | -1.8°C | 169 mm | 71% | 3.9 m/s | 5 |
| 1998 | 19.7°C | 12.9°C | 6.2°C | 26.9°C | -0.2°C | 69 mm | 63% | 3.2 m/s | 5.9 |
| 1997 | 16.3°C | 9.4°C | 2.5°C | 28.2°C | -4.9°C | 38 mm | 64% | 3.4 m/s | 6.1 |
| 1996 | 15.1°C | 9.0°C | 2.8°C | 22.9°C | -4.1°C | 81 mm | 68% | 2.6 m/s | 5.5 |
| 1995 | 16.7°C | 10.1°C | 3.5°C | 29.7°C | -2.8°C | 66 mm | 67% | 3 m/s | 5.5 |
| 1994 | 20.2°C | 12.8°C | 5.5°C | 28.5°C | -3.9°C | 50 mm | 59% | 3.6 m/s | 6.1 |
| 1993 | 18.7°C | 11.4°C | 4.1°C | 28.5°C | -1.3°C | 38 mm | 56% | 3.1 m/s | 5.7 |
| 1992 | 19.3°C | 12.0°C | 4.6°C | 31.0°C | -2.4°C | 44 mm | 63% | 3.6 m/s | 5.9 |
| 1991 | 19.7°C | 13.5°C | 7.3°C | 29.2°C | -3.1°C | 58 mm | 64% | 3.4 m/s | 5.3 |
| 1990 | 17.1°C | 10.3°C | 3.5°C | 25.5°C | -4.2°C | 68 mm | 62% | 3.1 m/s | 6 |
| 1989 | 20.9°C | 13.6°C | 6.2°C | 28.6°C | -4.5°C | 36 mm | 52% | 3.2 m/s | 6 |
| 1988 | 21.3°C | 14.1°C | 6.8°C | 33.3°C | -1.4°C | 63 mm | 63% | 3.3 m/s | 5.3 |
| 1987 | 21.8°C | 14.4°C | 7.1°C | 31.2°C | 0.6°C | 34 mm | 58% | 3.5 m/s | 5.9 |
| 1986 | 19.2°C | 12.4°C | 5.5°C | 30.6°C | -4.5°C | 66 mm | 67% | 3.9 m/s | 6.1 |
| 1985 | 20.5°C | 13.5°C | 6.4°C | 27.7°C | 1.6°C | 36 mm | 60% | 3.2 m/s | 5.7 |
| 1984 | 16.6°C | 9.6°C | 2.6°C | 31.4°C | -8.5°C | 27 mm | 62% | 3.4 m/s | 5.7 |
| 1983 | 15.0°C | 8.0°C | 0.9°C | 25.8°C | -6.6°C | 55 mm | 66% | 3.6 m/s | — |
| 1982 | 17.1°C | 11.3°C | 5.5°C | 28.1°C | -3.0°C | 82 mm | 71% | 3.4 m/s | — |
| 1981 | 17.3°C | 10.7°C | 4.1°C | 28.6°C | -6.2°C | 61 mm | 63% | 3.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.1°C with lows near 4.9°C (mean 11.5°C), based on 45 years of NASA POWER data.
May averages 69 mm of rainfall in Brandon, a relatively wet time of year. The wettest on record was 169 mm in 1999.
The hottest May reached 33.3°C in 1988. The coldest dipped to -8.5°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.8°C. Daytime highs moved from 17.3°C to 18.8°C and overnight lows from 3.9°C to 5.9°C over the same span.
May is one of the warmer months of the year in Brandon and a relatively wet time of year, so plan for around 18.1°C daytime highs and 4.9°C at night.
Not quite — May is the 8th coolest month in Brandon, averaging 11.5°C.
For May in Brandon, pack warm layers and a jacket for chilly mornings, with typical highs of 18.1°C and lows of 4.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 63% — moderately humid.
Average wind speed in May is 3.4 m/s. The windiest May on record averaged 3.9 m/s (1986).
The wettest May on record was 1999 with 169 mm. On average, May sees 69 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 Brandon 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.
