May is one of the warmer months of the year in Tinley Park, with average highs near 20.2°C and lows around 9.1°C (mean 14.7°C). It is a relatively wet time of year, averaging 107 mm of rainfall and 77% relative humidity across the period.
May is one of the warmer months of the year in Tinley Park. Across 45 years of records, the warmest May in Tinley Park was 2018 — when the month averaged 18.2°C — while the coldest was 1997 at 11.2°C. Typical May days reach 20.2°C with nights near 9.1°C. The long-term trend is warming, about 0.5°C per decade.
May is a relatively wet time of year in Tinley Park, averaging 107 mm of rainfall. The wettest May on record was 1996 with 202 mm, while the driest was 1992 at 22 mm.
Relative humidity in Tinley Park during May averages 77%. The most humid May was 1991 at 85%, and the least humid was 2023 at 68%.
May receives about 5.4 kWh/m²/day of solar energy in Tinley Park. The sunniest May was 1994 at 6.7 kWh/m²/day, and the cloudiest was 1996 at 4.4.
Average wind speed in Tinley Park during May is 3.3 m/s. The windiest Mays were 1997 and 2017 at 3.7 m/s, while the calmest was 1982 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.0°C | 14.0°C | 14.5°C | 15.5°C | 15.3°C | +1.3°C |
| Avg High | 19.7°C | 19.4°C | 20.1°C | 20.9°C | 20.8°C | +1.1°C |
| Avg Low | 8.3°C | 8.5°C | 8.8°C | 10.2°C | 9.8°C | +1.5°C |
| Avg Rain | 110 mm | 106 mm | 101 mm | 118 mm | 95 mm | -15 mm |
May temperatures in Tinley Park have risen by about 2.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of -3°C (2020) to a record high of 33.2°C (2012).
Rainfall in May is a relatively wet time of year, averaging 107 mm, with a wettest year of 202 mm.
A good time to visit Tinley Park
May is a good time to visit Tinley Park, with days averaging 20.2°C and nights around 9.1°C (mean 14.7°C, warmer than Tinley Park's yearly average) and higher rainfall. August and July 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 | 19.8°C | 14.3°C | 8.7°C | 27.9°C | 2.9°C | 56 mm | 74% | 3.3 m/s | 5.6 |
| 2024 | 22.7°C | 17.0°C | 11.3°C | 28.2°C | 7.8°C | 103 mm | 76% | 3.1 m/s | 6.1 |
| 2023 | 22.0°C | 15.8°C | 9.5°C | 30.8°C | 1.8°C | 43 mm | 68% | 3 m/s | 6.1 |
| 2022 | 21.1°C | 16.1°C | 11.1°C | 29.4°C | 3.4°C | 93 mm | 80% | 3.6 m/s | 5.1 |
| 2021 | 20.0°C | 14.6°C | 9.2°C | 30.3°C | 1.3°C | 99 mm | 71% | 3.1 m/s | 5.4 |
| 2020 | 19.0°C | 13.9°C | 8.8°C | 28.4°C | -3.0°C | 175 mm | 80% | 3.1 m/s | 5.6 |
| 2019 | 19.6°C | 14.3°C | 8.9°C | 26.4°C | 3.7°C | 173 mm | 81% | 3.3 m/s | 4.8 |
| 2018 🔥 | 23.8°C | 18.2°C | 12.7°C | 32.8°C | 6.9°C | 105 mm | 80% | 2.8 m/s | 5.7 |
| 2017 | 18.8°C | 13.7°C | 8.5°C | 27.2°C | 1.0°C | 91 mm | 80% | 3.7 m/s | 5.6 |
| 2016 | 20.0°C | 14.8°C | 9.6°C | 28.5°C | 0.9°C | 87 mm | 76% | 3.2 m/s | 5.6 |
| 2015 | 21.8°C | 16.3°C | 10.8°C | 27.1°C | 2.0°C | 118 mm | 76% | 3.4 m/s | 5 |
| 2014 | 20.5°C | 14.9°C | 9.3°C | 28.6°C | 2.8°C | 110 mm | 76% | 3.3 m/s | 5.7 |
| 2013 | 21.4°C | 16.1°C | 10.9°C | 27.6°C | 1.1°C | 117 mm | 79% | 3.1 m/s | 5.3 |
| 2012 | 23.1°C | 17.3°C | 11.5°C | 33.2°C | 5.4°C | 85 mm | 72% | 3.2 m/s | 6.3 |
| 2011 | 19.1°C | 14.2°C | 9.2°C | 28.8°C | 0.9°C | 146 mm | 84% | 3.5 m/s | 4.7 |
| 2010 | 21.0°C | 15.6°C | 10.2°C | 30.3°C | 0.9°C | 148 mm | 79% | 3.2 m/s | 5.2 |
| 2009 | 19.8°C | 14.2°C | 8.6°C | 26.9°C | 1.8°C | 102 mm | 78% | 3 m/s | 5.6 |
| 2008 | 17.7°C | 12.3°C | 6.8°C | 25.3°C | 2.0°C | 90 mm | 78% | 3.5 m/s | 5.2 |
| 2007 | 22.1°C | 16.3°C | 10.5°C | 28.2°C | 3.3°C | 53 mm | 77% | 3.2 m/s | 5.8 |
| 2006 | 19.9°C | 14.7°C | 9.5°C | 29.8°C | 3.3°C | 104 mm | 77% | 3 m/s | 5.4 |
| 2005 | 19.9°C | 13.9°C | 7.9°C | 25.8°C | -1.2°C | 40 mm | 72% | 3.2 m/s | 5.6 |
| 2004 | 21.5°C | 16.0°C | 10.5°C | 28.6°C | -0.1°C | 149 mm | 79% | 3.6 m/s | 5 |
| 2003 | 19.2°C | 13.4°C | 7.7°C | 27.0°C | 1.8°C | 118 mm | 76% | 3.6 m/s | 5.2 |
| 2002 | 18.3°C | 12.2°C | 6.2°C | 28.1°C | -0.1°C | 131 mm | 79% | 3.6 m/s | 5.3 |
| 2001 | 20.8°C | 15.2°C | 9.7°C | 29.8°C | 4.4°C | 104 mm | 74% | 3.4 m/s | 5 |
| 2000 | 22.2°C | 16.4°C | 10.6°C | 27.7°C | 3.7°C | 118 mm | 75% | 3.4 m/s | 4.5 |
| 1999 | 21.6°C | 15.9°C | 10.2°C | 27.4°C | 4.4°C | 86 mm | 76% | 3.4 m/s | 5.7 |
| 1998 | 22.5°C | 17.2°C | 11.9°C | 29.4°C | 6.8°C | 103 mm | 79% | 2.9 m/s | 5.9 |
| 1997 ❄️ | 16.9°C | 11.2°C | 5.6°C | 25.3°C | 1.8°C | 106 mm | 74% | 3.7 m/s | 5.2 |
| 1996 🌧️ | 18.4°C | 12.7°C | 6.9°C | 28.2°C | -0.2°C | 202 mm | 80% | 3.3 m/s | 4.4 |
| 1995 | 18.3°C | 13.2°C | 8.0°C | 23.9°C | 2.8°C | 131 mm | 77% | 3.2 m/s | 4.9 |
| 1994 | 18.7°C | 12.6°C | 6.4°C | 26.6°C | 0.4°C | 33 mm | 73% | 2.9 m/s | 6.7 |
| 1993 | 19.4°C | 14.0°C | 8.5°C | 26.2°C | 2.3°C | 77 mm | 80% | 3.4 m/s | 5.4 |
| 1992 | 18.8°C | 12.9°C | 7.0°C | 26.2°C | 1.0°C | 22 mm | 72% | 3.1 m/s | 5.9 |
| 1991 | 22.3°C | 17.7°C | 13.1°C | 28.5°C | 3.0°C | 141 mm | 85% | 2.9 m/s | 5.3 |
| 1990 | 17.5°C | 12.3°C | 7.1°C | 22.6°C | 1.3°C | 162 mm | 79% | 3.6 m/s | 5 |
| 1989 | 18.7°C | 13.1°C | 7.4°C | 26.3°C | -2.0°C | 140 mm | 73% | 3.3 m/s | 5.4 |
| 1988 | 21.3°C | 14.6°C | 7.9°C | 29.7°C | 2.4°C | 41 mm | 69% | 3.2 m/s | 6.4 |
| 1987 | 22.4°C | 16.6°C | 10.9°C | 27.0°C | 2.1°C | 151 mm | 76% | 3.1 m/s | 5.9 |
| 1986 | 19.7°C | 14.4°C | 9.0°C | 27.2°C | 2.0°C | 97 mm | 79% | 3.2 m/s | 5.1 |
| 1985 | 20.7°C | 15.0°C | 9.2°C | 26.7°C | 4.1°C | 57 mm | 74% | 3.6 m/s | 5.7 |
| 1984 | 17.6°C | 12.0°C | 6.4°C | 24.9°C | 0.1°C | 140 mm | 78% | 3.5 m/s | 5 |
| 1983 | 17.0°C | 11.6°C | 6.3°C | 23.6°C | -1.0°C | 113 mm | 80% | 3.6 m/s | — |
| 1982 | 22.7°C | 17.1°C | 11.6°C | 26.7°C | 5.3°C | 114 mm | 79% | 2.7 m/s | — |
| 1981 | 17.5°C | 11.9°C | 6.3°C | 25.3°C | -0.3°C | 136 mm | 76% | 3.5 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 20.2°C with lows near 9.1°C (mean 14.7°C), based on 45 years of NASA POWER data.
May averages 107 mm of rainfall in Tinley Park, a relatively wet time of year. The wettest on record was 202 mm in 1996.
The hottest May reached 33.2°C in 2012. The coldest dipped to -3°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.1°C. Daytime highs moved from 19.1°C to 21.1°C and overnight lows from 8°C to 10°C over the same span.
May is one of the warmer months of the year in Tinley Park and a relatively wet time of year, so plan for around 20.2°C daytime highs and 9.1°C at night.
Not quite — May is the 8th coolest month in Tinley Park, averaging 14.7°C.
For May in Tinley Park, pack light layers you can adjust through the day, with typical highs of 20.2°C and lows of 9.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 77% — quite humid.
Average wind speed in May is 3.3 m/s. The windiest May on record averaged 3.7 m/s (1997).
The wettest May on record was 1996 with 202 mm. On average, May sees 107 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 Tinley Park 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.
