May is one of the warmer months of the year in Stone Mountain, with average highs near 25.9°C and lows around 14.2°C (mean 20°C). It is about average for rainfall, averaging 100 mm of rainfall and 76% relative humidity across the period.
May is one of the warmer months of the year in Stone Mountain. Across 45 years of records, the warmest May in Stone Mountain was 2004 — when the month averaged 22.5°C — while the coldest was 1997 at 17.2°C. Typical May days reach 25.9°C with nights near 14.2°C. The long-term trend is warming, about 0.3°C per decade.
May is about average for rainfall in Stone Mountain, averaging 100 mm of rainfall. The wettest May on record was 2003 with 239 mm, while the driest was 2007 at 29 mm.
Relative humidity in Stone Mountain during May averages 76%. The most humid May was 2009 at 86%, and the least humid was 2007 at 58%.
May receives about 6 kWh/m²/day of solar energy in Stone Mountain. The sunniest Mays were 2007 and 2019 at 6.8 kWh/m²/day, and the cloudiest were 1991 and 2009 at 4.8.
Average wind speed in Stone Mountain during May is 1.1 m/s. The windiest Mays were 2006, 2008 and 2009, among others at 1.2 m/s, while the calmest were 1982 and 1987 at 0.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.3°C | 19.6°C | 20.4°C | 20.7°C | 20.0°C | +0.7°C |
| Avg High | 25.5°C | 25.2°C | 26.6°C | 26.4°C | 25.5°C | 0°C |
| Avg Low | 13.1°C | 13.9°C | 14.3°C | 15.1°C | 14.6°C | +1.5°C |
| Avg Rain | 101 mm | 93 mm | 93 mm | 108 mm | 106 mm | +5 mm |
May temperatures in Stone Mountain have risen by about 1.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 2.7°C (2011) to a record high of 35°C (2006).
Rainfall in May is about average for rainfall, averaging 100 mm, with a wettest year of 239 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Stone Mountain
May is one of the best times to visit Stone Mountain. Expect days averaging 25.9°C and nights around 14.2°C (mean 20°C) — warmer than Stone Mountain's yearly average — with higher rainfall (100 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 25.1°C | 20.3°C | 15.5°C | 29.8°C | 9.4°C | 193 mm | 82% | 1.1 m/s | 5.3 |
| 2024 | 26.7°C | 21.6°C | 16.4°C | 29.4°C | 10.1°C | 124 mm | 80% | 0.9 m/s | 5.8 |
| 2023 | 24.5°C | 19.2°C | 14.0°C | 30.8°C | 5.3°C | 65 mm | 81% | 1.1 m/s | 5.6 |
| 2022 | 27.7°C | 21.5°C | 15.3°C | 32.5°C | 8.9°C | 62 mm | 74% | 1.1 m/s | 6.2 |
| 2021 | 24.8°C | 19.0°C | 13.1°C | 31.3°C | 6.3°C | 122 mm | 76% | 1.1 m/s | 6.4 |
| 2020 | 24.0°C | 18.5°C | 13.0°C | 29.5°C | 4.2°C | 68 mm | 81% | 1.1 m/s | 6.4 |
| 2019 | 28.0°C | 22.3°C | 16.7°C | 32.4°C | 7.9°C | 56 mm | 77% | 1 m/s | 6.8 |
| 2018 | 27.1°C | 21.9°C | 16.8°C | 32.2°C | 9.5°C | 137 mm | 81% | 0.9 m/s | 5.9 |
| 2017 | 26.4°C | 20.4°C | 14.4°C | 32.8°C | 5.8°C | 178 mm | 75% | 1.1 m/s | 6.2 |
| 2016 | 25.5°C | 19.6°C | 13.6°C | 32.3°C | 5.7°C | 69 mm | 77% | 1.1 m/s | 6.5 |
| 2015 | 26.6°C | 21.0°C | 15.4°C | 29.7°C | 7.5°C | 107 mm | 77% | 0.9 m/s | 6.6 |
| 2014 | 25.5°C | 20.0°C | 14.5°C | 30.2°C | 6.7°C | 102 mm | 81% | 1 m/s | 6.3 |
| 2013 | 23.7°C | 18.4°C | 13.0°C | 28.3°C | 4.2°C | 150 mm | 81% | 1.1 m/s | 5.9 |
| 2012 | 28.2°C | 22.2°C | 16.3°C | 34.7°C | 9.4°C | 95 mm | 73% | 1 m/s | 6.3 |
| 2011 | 26.7°C | 20.1°C | 13.6°C | 33.6°C | 2.7°C | 47 mm | 73% | 1.1 m/s | 6.7 |
| 2010 | 26.6°C | 21.4°C | 16.2°C | 30.2°C | 8.0°C | 142 mm | 82% | 1 m/s | 5.9 |
| 2009 | 24.3°C | 19.9°C | 15.5°C | 29.3°C | 5.8°C | 144 mm | 86% | 1.2 m/s | 4.8 |
| 2008 | 25.9°C | 19.6°C | 13.3°C | 32.3°C | 7.8°C | 81 mm | 75% | 1.2 m/s | 6.2 |
| 2007 | 29.3°C | 21.6°C | 14.0°C | 32.5°C | 7.6°C | 29 mm | 58% | 1.1 m/s | 6.8 |
| 2006 | 26.7°C | 20.4°C | 14.1°C | 35.0°C | 7.7°C | 56 mm | 72% | 1.2 m/s | 6.3 |
| 2005 | 24.2°C | 18.1°C | 12.0°C | 30.0°C | 4.8°C | 59 mm | 78% | 1 m/s | 6.2 |
| 2004 🔥 | 28.9°C | 22.5°C | 16.1°C | 33.5°C | 3.7°C | 89 mm | 70% | 1.1 m/s | 5.9 |
| 2003 🌧️ | 24.7°C | 20.1°C | 15.4°C | 28.7°C | 9.4°C | 239 mm | 86% | 1.1 m/s | 4.9 |
| 2002 | 26.6°C | 19.9°C | 13.3°C | 31.7°C | 4.3°C | 94 mm | 71% | 1.1 m/s | 6.2 |
| 2001 | 25.7°C | 19.7°C | 13.8°C | 30.1°C | 8.1°C | 98 mm | 76% | 1 m/s | 6.2 |
| 2000 | 29.4°C | 22.3°C | 15.1°C | 34.2°C | 8.3°C | 46 mm | 65% | 1.1 m/s | 6.3 |
| 1999 | 26.6°C | 19.9°C | 13.2°C | 30.0°C | 5.5°C | 91 mm | 71% | 1.1 m/s | 6.3 |
| 1998 | 27.2°C | 21.7°C | 16.3°C | 30.7°C | 8.9°C | 93 mm | 80% | 1 m/s | 6.7 |
| 1997 ❄️ | 23.1°C | 17.2°C | 11.4°C | 27.9°C | 5.2°C | 120 mm | 78% | 1.2 m/s | 5.9 |
| 1996 | 26.4°C | 20.8°C | 15.3°C | 30.6°C | 5.6°C | 67 mm | 81% | 1 m/s | 6.6 |
| 1995 | 26.0°C | 20.4°C | 14.7°C | 31.1°C | 6.1°C | 78 mm | 76% | 1.1 m/s | 6.1 |
| 1994 | 24.0°C | 18.0°C | 12.0°C | 28.7°C | 7.6°C | 69 mm | 78% | 1.1 m/s | 6.5 |
| 1993 | 24.3°C | 19.0°C | 13.7°C | 29.9°C | 6.2°C | 106 mm | 81% | 1 m/s | 5.8 |
| 1992 | 23.8°C | 18.0°C | 12.2°C | 28.5°C | 5.6°C | 47 mm | 77% | 1.1 m/s | 5.8 |
| 1991 | 26.4°C | 21.7°C | 17.0°C | 31.1°C | 8.3°C | 158 mm | 84% | 1.1 m/s | 4.8 |
| 1990 | 24.4°C | 18.8°C | 13.2°C | 28.9°C | 6.2°C | 102 mm | 79% | 1.1 m/s | 6 |
| 1989 | 23.3°C | 17.4°C | 11.5°C | 31.0°C | 3.8°C | 105 mm | 79% | 1.2 m/s | 5.9 |
| 1988 | 26.5°C | 19.2°C | 12.0°C | 33.5°C | 6.5°C | 35 mm | 65% | 1 m/s | 6.3 |
| 1987 | 26.0°C | 21.0°C | 16.0°C | 29.2°C | 10.0°C | 71 mm | 81% | 0.8 m/s | 5.6 |
| 1986 | 28.1°C | 21.2°C | 14.4°C | 32.6°C | 6.2°C | 92 mm | 64% | 1.1 m/s | 5.6 |
| 1985 | 25.5°C | 19.6°C | 13.6°C | 33.0°C | 7.0°C | 115 mm | 74% | 1.1 m/s | 5.7 |
| 1984 | 24.2°C | 18.1°C | 12.0°C | 28.2°C | 4.8°C | 152 mm | 81% | 1.1 m/s | 5.5 |
| 1983 | 23.8°C | 18.0°C | 12.2°C | 26.7°C | 6.4°C | 113 mm | 81% | 1.2 m/s | — |
| 1982 | 26.0°C | 20.4°C | 14.8°C | 29.3°C | 5.8°C | 95 mm | 78% | 0.8 m/s | — |
| 1981 | 26.1°C | 18.9°C | 11.6°C | 31.4°C | 5.9°C | 129 mm | 67% | 1.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 25.9°C with lows near 14.2°C (mean 20°C), based on 45 years of NASA POWER data.
May averages 100 mm of rainfall in Stone Mountain, about average for rainfall. The wettest on record was 239 mm in 2003.
The hottest May reached 35°C in 2006. The coldest dipped to 2.7°C in 2011.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.3°C. Daytime highs moved from 25.1°C to 25.8°C and overnight lows from 12.8°C to 14.9°C over the same span.
May is one of the warmer months of the year in Stone Mountain and about average for rainfall, so plan for around 25.9°C daytime highs and 14.2°C at night.
Not quite — May is the 8th coolest month in Stone Mountain, averaging 20°C.
For May in Stone Mountain, pack light layers you can adjust through the day, with typical highs of 25.9°C and lows of 14.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 76% — quite humid.
Average wind speed in May is 1.1 m/s. The windiest May on record averaged 1.2 m/s (1983).
The wettest May on record was 2003 with 239 mm. On average, May sees 100 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 Stone Mountain 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.
