May is one of the cooler months of the year in Tumby Bay, with average highs near 17.6°C and lows around 14.6°C (mean 16.1°C). It is about average for rainfall, averaging 38 mm of rainfall and 73% relative humidity across the period.
May is one of the cooler months of the year in Tumby Bay. Across 45 years of records, the warmest Mays in Tumby Bay were 2002, 2013 and 2014 — when the month averaged 17.3°C — while the coldest were 1995, 2006 and 2020 at 15°C. Typical May days reach 17.6°C with nights near 14.6°C. The long-term May temperature trend is broadly flat.
May is about average for rainfall in Tumby Bay, averaging 38 mm of rainfall. The wettest May on record was 1997 with 69 mm, while the driest was 2024 at 2 mm.
Relative humidity in Tumby Bay during May averages 73%. The most humid May was 1988 at 77%, and the least humid was 2021 at 67%.
May receives about 2.8 kWh/m²/day of solar energy in Tumby Bay. The sunniest Mays were 2024 and 2025 at 3.2 kWh/m²/day, and the cloudiest was 1997 at 2.4.
Average wind speed in Tumby Bay during May is 5 m/s. The windiest May was 2007 at 6.3 m/s, while the calmest were 2005, 2009 and 2024, among others at 4.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.8°C | 15.9°C | 16.2°C | 16.3°C | 16.2°C | +0.4°C |
| Avg High | 17.4°C | 17.5°C | 17.6°C | 17.9°C | 17.6°C | +0.2°C |
| Avg Low | 14.2°C | 14.5°C | 14.8°C | 14.8°C | 14.6°C | +0.4°C |
| Avg Rain | 47 mm | 42 mm | 42 mm | 33 mm | 16 mm | -30 mm |
May temperatures in Tumby Bay have risen by about 0.6°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 10.7°C (2000) to a record high of 26°C (2002).
Rainfall in May is about average for rainfall, averaging 38 mm, with a wettest year of 69 mm.
A good time to visit Tumby Bay
May is a good time to visit Tumby Bay, with days averaging 17.6°C and nights around 14.6°C (mean 16.1°C, close to Tumby Bay'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 | 17.1°C | 15.4°C | 23.6°C | 12.4°C | 15 mm | 68% | 4.9 m/s | 3.2 |
| 2024 | 17.6°C | 16.1°C | 14.5°C | 20.6°C | 12.7°C | 2 mm | 75% | 4.1 m/s | 3.2 |
| 2023 | 17.4°C | 16.0°C | 14.6°C | 20.1°C | 12.9°C | 19 mm | 75% | 4.9 m/s | 2.6 |
| 2022 | 17.6°C | 16.3°C | 14.9°C | 21.4°C | 13.2°C | 24 mm | 73% | 5.1 m/s | 3.1 |
| 2021 | 18.0°C | 16.5°C | 15.0°C | 23.8°C | 12.4°C | 11 mm | 67% | 4.8 m/s | 2.8 |
| 2020 | 16.5°C | 15.0°C | 13.4°C | 21.3°C | 11.4°C | 28 mm | 72% | 5.8 m/s | 2.8 |
| 2019 | 17.5°C | 16.0°C | 14.5°C | 22.6°C | 12.9°C | 27 mm | 73% | 5.4 m/s | 2.7 |
| 2018 | 18.0°C | 16.6°C | 15.1°C | 24.3°C | 13.1°C | 9 mm | 70% | 5.3 m/s | 2.5 |
| 2017 | 18.0°C | 16.4°C | 14.8°C | 21.4°C | 12.9°C | 8 mm | 70% | 4.8 m/s | 2.9 |
| 2016 | 18.6°C | 16.8°C | 15.0°C | 22.5°C | 13.4°C | 23 mm | 73% | 6.2 m/s | 2.8 |
| 2015 | 16.9°C | 15.5°C | 14.1°C | 22.2°C | 12.7°C | 14 mm | 75% | 5.5 m/s | 2.7 |
| 2014 | 19.0°C | 17.3°C | 15.5°C | 23.1°C | 12.4°C | 59 mm | 76% | 4.4 m/s | 2.8 |
| 2013 | 19.0°C | 17.3°C | 15.5°C | 25.1°C | 13.4°C | 51 mm | 73% | 4.9 m/s | 2.7 |
| 2012 | 17.1°C | 15.7°C | 14.3°C | 23.8°C | 12.2°C | 56 mm | 73% | 5 m/s | 2.6 |
| 2011 | 16.8°C | 15.6°C | 14.4°C | 22.3°C | 12.4°C | 34 mm | 73% | 4.9 m/s | 2.7 |
| 2010 | 17.9°C | 16.2°C | 14.5°C | 23.1°C | 12.6°C | 47 mm | 74% | 4.8 m/s | 2.8 |
| 2009 | 17.2°C | 16.3°C | 15.3°C | 20.6°C | 14.3°C | 14 mm | 76% | 4.1 m/s | 2.6 |
| 2008 | 18.1°C | 16.5°C | 14.8°C | 21.7°C | 12.6°C | 37 mm | 76% | 4.5 m/s | 3 |
| 2007 | 18.6°C | 16.8°C | 14.9°C | 24.1°C | 11.9°C | 54 mm | 75% | 6.3 m/s | 2.8 |
| 2006 | 16.2°C | 15.0°C | 13.8°C | 19.2°C | 12.1°C | 50 mm | 74% | 4.6 m/s | 2.6 |
| 2005 | 18.3°C | 16.9°C | 15.6°C | 25.0°C | 14.1°C | 18 mm | 74% | 4.1 m/s | 2.6 |
| 2004 | 17.4°C | 15.9°C | 14.3°C | 20.1°C | 11.7°C | 43 mm | 74% | 5.3 m/s | 2.9 |
| 2003 | 17.7°C | 16.2°C | 14.7°C | 23.8°C | 13.4°C | 45 mm | 75% | 4.6 m/s | 2.8 |
| 2002 🔥 | 18.9°C | 17.3°C | 15.7°C | 26.0°C | 12.8°C | 35 mm | 68% | 4.7 m/s | 3 |
| 2001 | 17.2°C | 16.0°C | 14.8°C | 22.2°C | 13.0°C | 63 mm | 73% | 4.4 m/s | 2.7 |
| 2000 | 16.8°C | 15.5°C | 14.2°C | 21.1°C | 10.7°C | 60 mm | 75% | 5.2 m/s | 2.8 |
| 1999 | 17.9°C | 16.2°C | 14.6°C | 21.8°C | 13.1°C | 46 mm | 73% | 5 m/s | 2.6 |
| 1998 | 17.9°C | 16.2°C | 14.6°C | 21.5°C | 13.3°C | 16 mm | 74% | 4.6 m/s | 2.7 |
| 1997 🌧️ | 16.7°C | 15.6°C | 14.5°C | 23.4°C | 12.9°C | 69 mm | 77% | 5 m/s | 2.4 |
| 1996 | 17.4°C | 15.8°C | 14.3°C | 23.2°C | 12.1°C | 23 mm | 74% | 4.1 m/s | 2.9 |
| 1995 ❄️ | 16.4°C | 15.0°C | 13.6°C | 21.4°C | 12.5°C | 67 mm | 74% | 5.1 m/s | 2.6 |
| 1994 | 17.9°C | 16.1°C | 14.3°C | 23.8°C | 13.2°C | 36 mm | 71% | 6 m/s | 2.9 |
| 1993 | 18.1°C | 16.6°C | 15.0°C | 23.6°C | 12.5°C | 38 mm | 74% | 4.6 m/s | 2.9 |
| 1992 | 17.0°C | 15.5°C | 14.0°C | 23.2°C | 11.4°C | 66 mm | 75% | 4.8 m/s | 2.8 |
| 1991 | 17.2°C | 15.9°C | 14.6°C | 20.6°C | 13.1°C | 29 mm | 72% | 4.2 m/s | 2.6 |
| 1990 | 18.2°C | 16.6°C | 15.1°C | 24.0°C | 11.6°C | 35 mm | 73% | 5.2 m/s | 2.9 |
| 1989 | 17.5°C | 16.1°C | 14.8°C | 21.2°C | 12.7°C | 58 mm | 77% | 5.3 m/s | 2.7 |
| 1988 | 18.1°C | 16.5°C | 14.9°C | 23.2°C | 12.9°C | 62 mm | 77% | 5.3 m/s | 2.7 |
| 1987 | 16.9°C | 15.3°C | 13.7°C | 21.2°C | 10.9°C | 52 mm | 75% | 5.5 m/s | 2.6 |
| 1986 | 17.1°C | 15.6°C | 14.0°C | 20.4°C | 12.2°C | 29 mm | 75% | 4.9 m/s | 2.8 |
| 1985 | 17.1°C | 15.6°C | 14.1°C | 22.2°C | 12.2°C | 36 mm | 69% | 4.8 m/s | 2.9 |
| 1984 | 17.8°C | 16.0°C | 14.3°C | 22.5°C | 12.9°C | 36 mm | 71% | 5.1 m/s | 2.8 |
| 1983 | 16.8°C | 15.4°C | 14.0°C | 20.0°C | 12.0°C | 36 mm | 76% | 4.8 m/s | — |
| 1982 | 17.7°C | 16.0°C | 14.2°C | 22.0°C | 12.1°C | 43 mm | 71% | 5.4 m/s | — |
| 1981 | 17.4°C | 15.8°C | 14.2°C | 22.9°C | 11.5°C | 68 mm | 72% | 6.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 17.6°C with lows near 14.6°C (mean 16.1°C), based on 45 years of NASA POWER data.
May averages 38 mm of rainfall in Tumby Bay, about average for rainfall. The wettest on record was 69 mm in 1997.
The hottest May reached 26°C in 2002. The coldest dipped to 10.7°C in 2000.
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 17.4°C to 17.9°C and overnight lows from 14.2°C to 14.9°C over the same span.
May is one of the cooler months of the year in Tumby Bay and about average for rainfall, so plan for around 17.6°C daytime highs and 14.6°C at night.
Not quite — May is the 6th coolest month in Tumby Bay, averaging 16.1°C.
For May in Tumby Bay, pack light layers you can adjust through the day, with typical highs of 17.6°C and lows of 14.6°C.
Relative humidity in May averages 73% — moderately humid.
Average wind speed in May is 5 m/s. The windiest May on record averaged 6.3 m/s (2007).
The wettest May on record was 1997 with 69 mm. On average, May sees 38 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 Tumby Bay 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.
