May is one of the cooler months of the year in Muswellbrook, with average highs near 18.6°C and lows around 8°C (mean 13.3°C). It is one of the drier months, averaging 55 mm of rainfall and 77% relative humidity across the period.
May is one of the cooler months of the year in Muswellbrook. Across 45 years of records, the warmest May in Muswellbrook was 2016 — when the month averaged 15.1°C — while the coldest was 2020 at 11.8°C. Typical May days reach 18.6°C with nights near 8°C. The long-term May temperature trend is broadly flat.
May is one of the drier months in Muswellbrook, averaging 55 mm of rainfall. The wettest May on record was 2025 with 161 mm, while the driest was 2018 at 8 mm.
Relative humidity in Muswellbrook during May averages 77%. The most humid May was 1989 at 91%, and the least humid was 2004 at 59%.
May receives about 3.1 kWh/m²/day of solar energy in Muswellbrook. The sunniest May was 2004 at 3.6 kWh/m²/day, and the cloudiest were 1989 and 2025 at 2.6.
Average wind speed in Muswellbrook during May is 0.7 m/s. The windiest Mays were 1994 and 2000 at 0.8 m/s, while the calmest were 2017, 2021 and 2024, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 13.2°C | 13.6°C | 13.3°C | 13.5°C | 12.8°C | -0.4°C |
| Avg High | 18.3°C | 18.6°C | 18.7°C | 19.3°C | 17.7°C | -0.6°C |
| Avg Low | 8.1°C | 8.6°C | 7.9°C | 7.7°C | 7.9°C | -0.2°C |
| Avg Rain | 66 mm | 65 mm | 47 mm | 37 mm | 63 mm | -3 mm |
May temperatures in Muswellbrook have stayed relatively stable across the record.
May has ranged from a record low of -1°C (1987) to a record high of 26.8°C (2013).
Rainfall in May is one of the drier months, averaging 55 mm, with a wettest year of 161 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.1°C per decade while lows fell 0.1°C per decade, widening the gap between day and night.
A quieter season to visit Muswellbrook
If your dates are flexible, the more temperate months of December and February tend to be the most comfortable for visiting Muswellbrook. That said, May — with days averaging 18.6°C and nights around 8°C (mean 13.3°C) and moderate rainfall (55 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🌧️ | 18.2°C | 14.0°C | 9.7°C | 23.0°C | 5.9°C | 161 mm | 86% | 0.7 m/s | 2.6 |
| 2024 | 17.6°C | 13.3°C | 9.0°C | 20.2°C | 4.0°C | 80 mm | 86% | 0.6 m/s | 2.9 |
| 2023 | 18.3°C | 12.0°C | 5.8°C | 22.1°C | 2.3°C | 15 mm | 69% | 0.7 m/s | 3.5 |
| 2022 | 17.5°C | 13.1°C | 8.6°C | 23.8°C | 2.6°C | 48 mm | 86% | 0.7 m/s | 2.9 |
| 2021 | 18.0°C | 12.8°C | 7.6°C | 22.6°C | 1.3°C | 33 mm | 80% | 0.6 m/s | 3.2 |
| 2020 ❄️ | 16.7°C | 11.8°C | 6.9°C | 21.8°C | 3.1°C | 39 mm | 82% | 0.7 m/s | 3.1 |
| 2019 | 20.4°C | 14.1°C | 7.9°C | 25.6°C | 0.3°C | 20 mm | 67% | 0.7 m/s | 3.4 |
| 2018 | 20.3°C | 13.9°C | 7.5°C | 25.4°C | 3.2°C | 8 mm | 64% | 0.7 m/s | 3.5 |
| 2017 | 19.7°C | 13.9°C | 8.2°C | 23.2°C | 1.0°C | 18 mm | 73% | 0.6 m/s | 3.3 |
| 2016 🔥 | 21.5°C | 15.1°C | 8.6°C | 25.9°C | 0.7°C | 13 mm | 62% | 0.7 m/s | 3.3 |
| 2015 | 17.0°C | 12.4°C | 7.9°C | 21.8°C | 1.8°C | 75 mm | 84% | 0.7 m/s | 2.9 |
| 2014 | 19.7°C | 14.1°C | 8.6°C | 24.7°C | 1.9°C | 18 mm | 73% | 0.7 m/s | 3.2 |
| 2013 | 18.9°C | 13.3°C | 7.6°C | 26.8°C | 2.8°C | 41 mm | 74% | 0.7 m/s | 3.4 |
| 2012 | 19.1°C | 12.8°C | 6.5°C | 25.3°C | 3.0°C | 21 mm | 69% | 0.6 m/s | 3.5 |
| 2011 | 17.3°C | 11.9°C | 6.5°C | 22.3°C | 1.4°C | 97 mm | 75% | 0.7 m/s | 3.2 |
| 2010 | 18.8°C | 13.3°C | 7.9°C | 24.4°C | 2.5°C | 63 mm | 76% | 0.6 m/s | 3 |
| 2009 | 17.8°C | 13.3°C | 8.7°C | 22.0°C | 5.1°C | 72 mm | 80% | 0.7 m/s | 2.9 |
| 2008 | 18.7°C | 12.9°C | 7.0°C | 21.2°C | 4.1°C | 18 mm | 76% | 0.6 m/s | 3.4 |
| 2007 | 20.8°C | 14.8°C | 8.8°C | 25.7°C | 2.3°C | 39 mm | 69% | 0.6 m/s | 3.5 |
| 2006 | 18.8°C | 12.8°C | 6.7°C | 22.6°C | 2.2°C | 10 mm | 67% | 0.6 m/s | 3.4 |
| 2005 | 19.4°C | 13.9°C | 8.4°C | 23.9°C | 3.3°C | 41 mm | 72% | 0.6 m/s | 3.2 |
| 2004 | 20.2°C | 13.5°C | 6.7°C | 23.1°C | 0.0°C | 25 mm | 59% | 0.6 m/s | 3.6 |
| 2003 | 18.7°C | 14.0°C | 9.2°C | 24.2°C | 3.5°C | 68 mm | 79% | 0.7 m/s | 2.9 |
| 2002 | 18.4°C | 13.3°C | 8.1°C | 25.0°C | 3.0°C | 48 mm | 75% | 0.6 m/s | 3 |
| 2001 | 16.7°C | 12.2°C | 7.7°C | 21.4°C | 3.8°C | 102 mm | 84% | 0.6 m/s | 3 |
| 2000 | 17.0°C | 12.2°C | 7.4°C | 22.6°C | 1.7°C | 48 mm | 82% | 0.8 m/s | 3.1 |
| 1999 | 20.0°C | 14.4°C | 8.9°C | 23.0°C | 2.2°C | 13 mm | 77% | 0.7 m/s | 3.2 |
| 1998 | 17.2°C | 12.6°C | 8.0°C | 20.1°C | 1.5°C | 151 mm | 83% | 0.7 m/s | 2.9 |
| 1997 | 19.0°C | 14.1°C | 9.2°C | 24.7°C | 3.5°C | 63 mm | 78% | 0.6 m/s | 2.8 |
| 1996 | 18.9°C | 13.9°C | 8.9°C | 24.0°C | 3.2°C | 90 mm | 80% | 0.7 m/s | 3 |
| 1995 | 17.8°C | 13.4°C | 9.1°C | 24.0°C | 3.0°C | 109 mm | 80% | 0.7 m/s | 2.7 |
| 1994 | 18.9°C | 12.9°C | 6.9°C | 25.3°C | 2.0°C | 19 mm | 67% | 0.8 m/s | 3.5 |
| 1993 | 19.3°C | 13.8°C | 8.3°C | 24.9°C | 3.6°C | 33 mm | 73% | 0.6 m/s | 3.2 |
| 1992 | 18.0°C | 13.1°C | 8.2°C | 22.7°C | 3.3°C | 24 mm | 79% | 0.6 m/s | 3 |
| 1991 | 18.9°C | 14.1°C | 9.2°C | 24.4°C | 4.6°C | 76 mm | 79% | 0.6 m/s | 2.7 |
| 1990 | 17.6°C | 13.3°C | 9.0°C | 21.8°C | 4.3°C | 71 mm | 88% | 0.6 m/s | 3.1 |
| 1989 | 17.5°C | 13.8°C | 10.1°C | 21.9°C | 2.5°C | 103 mm | 91% | 0.7 m/s | 2.6 |
| 1988 | 18.0°C | 13.4°C | 8.8°C | 22.9°C | 4.8°C | 50 mm | 84% | 0.6 m/s | 2.8 |
| 1987 | 18.1°C | 12.7°C | 7.3°C | 22.8°C | -1.0°C | 66 mm | 76% | 0.7 m/s | 3 |
| 1986 | 19.9°C | 14.2°C | 8.5°C | 23.6°C | 4.5°C | 28 mm | 71% | 0.7 m/s | 3.1 |
| 1985 | 17.8°C | 13.0°C | 8.3°C | 23.4°C | 2.2°C | 69 mm | 84% | 0.7 m/s | 3.1 |
| 1984 | 17.9°C | 12.5°C | 7.1°C | 23.2°C | 2.8°C | 35 mm | 79% | 0.6 m/s | 3.2 |
| 1983 | 17.6°C | 13.0°C | 8.3°C | 21.1°C | 3.3°C | 100 mm | 84% | 0.7 m/s | — |
| 1982 | 19.7°C | 13.1°C | 6.5°C | 23.4°C | 0.2°C | 10 mm | 61% | 0.7 m/s | — |
| 1981 | 18.0°C | 12.8°C | 7.7°C | 22.1°C | 3.1°C | 133 mm | 77% | 0.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 18.6°C with lows near 8°C (mean 13.3°C), based on 45 years of NASA POWER data.
May averages 55 mm of rainfall in Muswellbrook, one of the drier months. The wettest on record was 161 mm in 2025.
The hottest May reached 26.8°C in 2013. The coldest dipped to -1°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.1°C — but days and nights have moved in opposite directions. Overnight lows rose from 7.6°C to 8.1°C while daytime highs eased from 18.2°C to 17.9°C, narrowing the gap between day and night.
May is one of the cooler months of the year in Muswellbrook and one of the drier months, so plan for around 18.6°C daytime highs and 8°C at night.
Not quite — May is the 4th coolest month in Muswellbrook, averaging 13.3°C.
For May in Muswellbrook, pack light layers you can adjust through the day, with typical highs of 18.6°C and lows of 8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 77% — quite humid.
Average wind speed in May is 0.7 m/s. The windiest May on record averaged 0.8 m/s (1994).
The wettest May on record was 2025 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 Muswellbrook 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.
