May is one of the cooler months of the year in Seymour, with average highs near 16.4°C and lows around 5.9°C (mean 11.1°C). It is about average for rainfall, averaging 52 mm of rainfall and 80% relative humidity across the period.
May is one of the cooler months of the year in Seymour. Across 45 years of records, the warmest May in Seymour was 1988 — when the month averaged 12.6°C — while the coldest was 2020 at 9.3°C. Typical May days reach 16.4°C with nights near 5.9°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Seymour, averaging 52 mm of rainfall. The wettest May on record was 1988 with 119 mm, while the driest was 1991 at 9 mm.
Relative humidity in Seymour during May averages 80%. The most humid May was 1989 at 88%, and the least humid was 2005 at 70%.
May receives about 2.3 kWh/m²/day of solar energy in Seymour. The sunniest May was 2025 at 2.9 kWh/m²/day, and the cloudiest was 1988 at 2.
Average wind speed in Seymour during May is 2 m/s. The windiest May was 1994 at 2.6 m/s, while the calmest were 2003, 2008 and 2024, among others at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.1°C | 11.0°C | 11.5°C | 11.3°C | 11.1°C | 0°C |
| Avg High | 16.1°C | 16.2°C | 16.9°C | 16.4°C | 16.5°C | +0.4°C |
| Avg Low | 6.2°C | 5.8°C | 6.0°C | 6.1°C | 5.6°C | -0.6°C |
| Avg Rain | 77 mm | 53 mm | 44 mm | 48 mm | 33 mm | -45 mm |
May temperatures in Seymour have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -0.1°C (1997) to a record high of 26.5°C (2002).
Rainfall in May is about average for rainfall, averaging 52 mm, with a wettest year of 119 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0°C per decade, widening the gap between day and night.
A good time to visit Seymour
May is a good time to visit Seymour, with days averaging 16.4°C and nights around 5.9°C (mean 11.1°C, cooler than Seymour's yearly average) and moderate rainfall. February and January 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 | 18.7°C | 12.5°C | 6.3°C | 24.8°C | 1.2°C | 9 mm | 70% | 2 m/s | 2.9 |
| 2024 | 17.8°C | 11.9°C | 6.1°C | 21.2°C | 2.0°C | 47 mm | 78% | 1.6 m/s | 2.7 |
| 2023 | 15.5°C | 10.1°C | 4.8°C | 20.1°C | 2.1°C | 31 mm | 81% | 2 m/s | 2.2 |
| 2022 | 16.0°C | 11.1°C | 6.2°C | 20.1°C | 2.3°C | 27 mm | 83% | 1.7 m/s | 2.1 |
| 2021 | 17.1°C | 11.4°C | 5.7°C | 23.8°C | 0.4°C | 49 mm | 76% | 2.1 m/s | 2.4 |
| 2020 ❄️ | 14.0°C | 9.3°C | 4.6°C | 18.0°C | 1.2°C | 31 mm | 87% | 2.3 m/s | 2.4 |
| 2019 | 16.8°C | 11.7°C | 6.7°C | 21.3°C | 1.6°C | 57 mm | 78% | 2.3 m/s | 2.1 |
| 2018 | 17.3°C | 11.8°C | 6.3°C | 26.1°C | 2.9°C | 43 mm | 76% | 2.4 m/s | 2.1 |
| 2017 | 16.6°C | 11.3°C | 6.0°C | 20.6°C | 2.5°C | 21 mm | 79% | 1.9 m/s | 2.4 |
| 2016 | 16.9°C | 11.8°C | 6.7°C | 24.0°C | 0.4°C | 57 mm | 78% | 2.5 m/s | 2.2 |
| 2015 | 15.9°C | 10.8°C | 5.7°C | 21.1°C | 1.9°C | 45 mm | 81% | 2.4 m/s | 2.2 |
| 2014 | 17.0°C | 12.1°C | 7.2°C | 21.7°C | 1.5°C | 62 mm | 84% | 1.9 m/s | 2.2 |
| 2013 | 16.7°C | 11.2°C | 5.6°C | 23.6°C | 2.2°C | 40 mm | 78% | 2 m/s | 2.3 |
| 2012 | 15.6°C | 10.4°C | 5.1°C | 20.7°C | 1.7°C | 55 mm | 81% | 2.1 m/s | 2.2 |
| 2011 | 14.8°C | 9.9°C | 4.9°C | 19.6°C | 1.2°C | 43 mm | 83% | 1.9 m/s | 2.1 |
| 2010 | 16.7°C | 11.6°C | 6.4°C | 21.2°C | 1.6°C | 52 mm | 82% | 1.8 m/s | 2.4 |
| 2009 | 17.5°C | 11.9°C | 6.3°C | 20.8°C | 3.1°C | 19 mm | 79% | 2 m/s | 2.5 |
| 2008 | 16.5°C | 11.0°C | 5.4°C | 19.9°C | 2.5°C | 37 mm | 80% | 1.6 m/s | 2.2 |
| 2007 | 17.5°C | 12.5°C | 7.6°C | 21.0°C | 2.7°C | 93 mm | 81% | 2.3 m/s | 2.2 |
| 2006 | 15.7°C | 10.4°C | 5.0°C | 19.9°C | 2.0°C | 34 mm | 82% | 2 m/s | 2.2 |
| 2005 | 18.7°C | 12.5°C | 6.2°C | 24.1°C | 2.9°C | 9 mm | 70% | 1.9 m/s | 2.7 |
| 2004 | 16.0°C | 10.4°C | 4.7°C | 20.0°C | 0.7°C | 39 mm | 80% | 2.1 m/s | 2.2 |
| 2003 | 17.4°C | 12.0°C | 6.6°C | 23.1°C | 1.0°C | 53 mm | 78% | 1.6 m/s | 2.5 |
| 2002 | 17.9°C | 12.2°C | 6.5°C | 26.5°C | 2.7°C | 35 mm | 73% | 1.8 m/s | 2.5 |
| 2001 | 16.4°C | 11.3°C | 6.1°C | 22.3°C | 3.9°C | 19 mm | 81% | 1.7 m/s | 2.4 |
| 2000 | 15.2°C | 10.5°C | 5.7°C | 21.5°C | 0.6°C | 99 mm | 83% | 2.2 m/s | 2.1 |
| 1999 | 16.8°C | 11.3°C | 5.8°C | 22.3°C | 0.1°C | 80 mm | 76% | 2 m/s | 2.3 |
| 1998 | 16.3°C | 11.2°C | 6.1°C | 22.1°C | 1.2°C | 25 mm | 81% | 1.9 m/s | 2.3 |
| 1997 | 16.1°C | 11.1°C | 6.2°C | 26.0°C | -0.1°C | 81 mm | 79% | 2 m/s | 2.1 |
| 1996 | 16.4°C | 11.0°C | 5.6°C | 23.4°C | 2.1°C | 30 mm | 82% | 1.8 m/s | 2.2 |
| 1995 | 15.1°C | 10.6°C | 6.1°C | 20.1°C | 1.8°C | 91 mm | 85% | 2 m/s | 2.3 |
| 1994 | 16.1°C | 10.7°C | 5.4°C | 21.6°C | 1.5°C | 35 mm | 76% | 2.6 m/s | 2.3 |
| 1993 | 16.5°C | 11.2°C | 5.9°C | 23.1°C | 0.8°C | 47 mm | 79% | 1.7 m/s | 2.3 |
| 1992 | 15.1°C | 10.4°C | 5.6°C | 20.9°C | 0.3°C | 101 mm | 86% | 1.8 m/s | 2.3 |
| 1991 | 17.3°C | 11.4°C | 5.6°C | 21.4°C | 2.1°C | 9 mm | 76% | 1.6 m/s | 2.4 |
| 1990 | 16.6°C | 11.1°C | 5.5°C | 23.1°C | 0.5°C | 30 mm | 80% | 2.1 m/s | 2.4 |
| 1989 | 16.3°C | 11.8°C | 7.4°C | 20.6°C | 1.2°C | 85 mm | 88% | 1.9 m/s | 2.2 |
| 1988 🔥 🌧️ | 16.9°C | 12.6°C | 8.2°C | 26.2°C | 2.6°C | 119 mm | 85% | 1.8 m/s | 2 |
| 1987 | 15.8°C | 10.9°C | 5.9°C | 21.3°C | 1.0°C | 76 mm | 82% | 2.1 m/s | 2.1 |
| 1986 | 15.6°C | 10.7°C | 5.9°C | 20.1°C | 1.3°C | 89 mm | 84% | 1.7 m/s | 2.2 |
| 1985 | 16.5°C | 11.2°C | 5.9°C | 24.3°C | 0.2°C | 70 mm | 78% | 1.9 m/s | 2.4 |
| 1984 | 16.4°C | 10.9°C | 5.4°C | 21.8°C | 2.6°C | 19 mm | 76% | 1.8 m/s | 2.7 |
| 1983 | 15.5°C | 11.0°C | 6.5°C | 19.1°C | 1.6°C | 106 mm | 87% | 2 m/s | — |
| 1982 | 15.8°C | 10.1°C | 4.4°C | 21.3°C | 1.0°C | 42 mm | 77% | 2 m/s | — |
| 1981 | 16.1°C | 10.9°C | 5.8°C | 23.0°C | 0.3°C | 90 mm | 79% | 2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 16.4°C with lows near 5.9°C (mean 11.1°C), based on 45 years of NASA POWER data.
May averages 52 mm of rainfall in Seymour, about average for rainfall. The wettest on record was 119 mm in 1988.
The hottest May reached 26.5°C in 2002. The coldest dipped to -0.1°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.6°C. Daytime highs moved from 16.1°C to 17°C and overnight lows from 5.6°C to 5.8°C over the same span.
May is one of the cooler months of the year in Seymour and about average for rainfall, so plan for around 16.4°C daytime highs and 5.9°C at night.
Not quite — May is the 5th coolest month in Seymour, averaging 11.1°C.
For May in Seymour, pack warm layers and a jacket for chilly mornings, with typical highs of 16.4°C and lows of 5.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 80% — quite humid.
Average wind speed in May is 2 m/s. The windiest May on record averaged 2.6 m/s (1994).
The wettest May on record was 1988 with 119 mm. On average, May sees 52 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 Seymour 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.
