August is one of the warmer months of the year in Mckinney, with average highs near 36.5°C and lows around 24.3°C (mean 30.4°C). It is one of the drier months, averaging 59 mm of rainfall and 56% relative humidity across the period.
August is one of the warmer months of the year in Mckinney. Across 45 years of records, the warmest August in Mckinney was 2023 — when the month averaged 34.9°C — while the coldest was 1992 at 26.3°C. Typical August days reach 36.5°C with nights near 24.3°C. The long-term trend is warming, about 0.2°C per decade.
August is one of the drier months in Mckinney, averaging 59 mm of rainfall. The wettest August on record was 2022 with 158 mm, while the driest was 2000 at 0 mm.
Relative humidity in Mckinney during August averages 56%. The most humid August was 2007 at 76%, and the least humid was 2023 at 34%.
August receives about 6.1 kWh/m²/day of solar energy in Mckinney. The sunniest August was 2023 at 6.9 kWh/m²/day, and the cloudiest was 1996 at 5.1.
Average wind speed in Mckinney during August is 2.5 m/s. The windiest August was 1989 at 3 m/s, while the calmest was 1998 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 30.5°C | 29.7°C | 30.0°C | 30.7°C | 31.5°C | +1°C |
| Avg High | 36.8°C | 35.8°C | 35.9°C | 36.8°C | 37.8°C | +1°C |
| Avg Low | 24.2°C | 23.6°C | 24.2°C | 24.6°C | 25.2°C | +1°C |
| Avg Rain | 42 mm | 69 mm | 59 mm | 62 mm | 66 mm | +24 mm |
August temperatures in Mckinney have risen by about 1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 15.1°C (1989) to a record high of 45.4°C (2023).
Rainfall in August is one of the drier months, averaging 59 mm, with a wettest year of 158 mm.
A good time to visit Mckinney
August is a good time to visit Mckinney, with days averaging 36.5°C and nights around 24.3°C (mean 30.4°C, warmer than Mckinney's yearly average) and moderate rainfall. May and October are marginally more temperate, but August still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 36.5°C | 30.4°C | 24.3°C | 41.8°C | 22.0°C | 84 mm | 57% | 2.1 m/s | 5.8 |
| 2024 | 40.0°C | 32.9°C | 25.7°C | 43.8°C | 23.2°C | 12 mm | 45% | 2.6 m/s | 6.4 |
| 2023 🔥 | 42.1°C | 34.9°C | 27.7°C | 45.4°C | 21.2°C | 4 mm | 34% | 2.7 m/s | 6.9 |
| 2022 🌧️ | 35.7°C | 30.6°C | 25.4°C | 42.0°C | 21.9°C | 158 mm | 59% | 2.4 m/s | 5.8 |
| 2021 | 35.1°C | 29.6°C | 24.0°C | 38.7°C | 22.0°C | 98 mm | 66% | 2.5 m/s | 5.9 |
| 2020 | 37.1°C | 30.6°C | 24.2°C | 42.4°C | 19.5°C | 41 mm | 55% | 2.6 m/s | 6.6 |
| 2019 | 37.4°C | 31.5°C | 25.7°C | 41.2°C | 23.4°C | 72 mm | 59% | 2.5 m/s | 5.9 |
| 2018 | 35.2°C | 29.7°C | 24.1°C | 39.3°C | 21.0°C | 85 mm | 60% | 2.8 m/s | 6.2 |
| 2017 | 32.7°C | 28.0°C | 23.2°C | 36.8°C | 19.4°C | 141 mm | 73% | 2.5 m/s | 5.3 |
| 2016 | 33.9°C | 28.9°C | 23.8°C | 41.0°C | 20.6°C | 122 mm | 69% | 2.3 m/s | 5.7 |
| 2015 | 37.2°C | 30.4°C | 23.7°C | 41.9°C | 19.2°C | 14 mm | 54% | 2.6 m/s | 6.4 |
| 2014 | 36.2°C | 29.7°C | 23.3°C | 39.8°C | 19.3°C | 40 mm | 58% | 2.6 m/s | 6.4 |
| 2013 | 37.8°C | 31.2°C | 24.6°C | 41.7°C | 18.6°C | 18 mm | 50% | 2.4 m/s | 6.5 |
| 2012 | 36.9°C | 30.4°C | 24.0°C | 43.8°C | 17.4°C | 80 mm | 53% | 2.4 m/s | 6.1 |
| 2011 | 41.6°C | 34.8°C | 28.1°C | 44.9°C | 24.0°C | 18 mm | 37% | 2.6 m/s | 6.4 |
| 2010 | 38.9°C | 32.3°C | 25.7°C | 43.1°C | 19.0°C | 26 mm | 50% | 2.5 m/s | 6.4 |
| 2009 | 36.0°C | 29.6°C | 23.2°C | 39.2°C | 17.7°C | 48 mm | 61% | 2.8 m/s | 6.5 |
| 2008 | 34.4°C | 29.1°C | 23.7°C | 42.4°C | 20.7°C | 115 mm | 65% | 2.4 m/s | 5.5 |
| 2007 | 32.8°C | 28.2°C | 23.6°C | 36.1°C | 21.4°C | 40 mm | 76% | 2.4 m/s | 6.1 |
| 2006 | 38.4°C | 32.2°C | 26.0°C | 41.6°C | 19.2°C | 41 mm | 49% | 2.8 m/s | 6.3 |
| 2005 | 36.4°C | 30.3°C | 24.3°C | 40.7°C | 21.8°C | 60 mm | 59% | 2.1 m/s | 6 |
| 2004 | 32.3°C | 26.7°C | 21.1°C | 36.6°C | 15.8°C | 80 mm | 67% | 2.3 m/s | 6.1 |
| 2003 | 37.2°C | 31.0°C | 24.9°C | 43.3°C | 21.2°C | 64 mm | 54% | 2.3 m/s | 5.6 |
| 2002 | 36.0°C | 29.9°C | 23.9°C | 39.2°C | 19.4°C | 48 mm | 58% | 2.7 m/s | 6 |
| 2001 | 35.1°C | 29.9°C | 24.7°C | 41.2°C | 21.5°C | 96 mm | 60% | 2.4 m/s | 5.8 |
| 2000 | 40.0°C | 33.2°C | 26.3°C | 43.1°C | 22.4°C | 0 mm | 37% | 2.9 m/s | 6.7 |
| 1999 | 39.9°C | 33.0°C | 26.1°C | 42.4°C | 21.2°C | 8 mm | 39% | 2.5 m/s | 6.6 |
| 1998 | 37.1°C | 31.2°C | 25.2°C | 42.7°C | 21.9°C | 50 mm | 54% | 2 m/s | 5.9 |
| 1997 | 35.3°C | 28.9°C | 22.6°C | 39.4°C | 17.3°C | 72 mm | 61% | 2.6 m/s | 6 |
| 1996 | 32.8°C | 27.9°C | 23.0°C | 40.0°C | 20.7°C | 145 mm | 70% | 2.4 m/s | 5.1 |
| 1995 | 36.3°C | 30.5°C | 24.6°C | 40.7°C | 21.5°C | 44 mm | 61% | 2.4 m/s | 6.3 |
| 1994 | 35.9°C | 29.3°C | 22.7°C | 39.8°C | 18.0°C | 87 mm | 58% | 2.6 m/s | 6.3 |
| 1993 | 38.2°C | 32.1°C | 25.9°C | 42.1°C | 21.7°C | 37 mm | 48% | 2.8 m/s | 6.2 |
| 1992 ❄️ | 32.5°C | 26.3°C | 20.1°C | 36.3°C | 15.3°C | 50 mm | 66% | 2.4 m/s | 5.9 |
| 1991 | 33.7°C | 28.1°C | 22.6°C | 37.1°C | 19.5°C | 136 mm | 66% | 2.1 m/s | 5.5 |
| 1990 | 36.2°C | 29.6°C | 23.1°C | 42.0°C | 16.7°C | 61 mm | 56% | 2.4 m/s | 6.3 |
| 1989 | 33.6°C | 27.9°C | 22.1°C | 38.8°C | 15.1°C | 54 mm | 65% | 3 m/s | 5.8 |
| 1988 | 38.4°C | 31.9°C | 25.5°C | 42.7°C | 17.7°C | 24 mm | 47% | 2.7 m/s | 5.9 |
| 1987 | 37.9°C | 31.7°C | 25.6°C | 41.9°C | 17.9°C | 36 mm | 48% | 2.9 m/s | 6.2 |
| 1986 | 36.0°C | 29.6°C | 23.2°C | 43.1°C | 16.1°C | 49 mm | 53% | 2.8 m/s | 5.7 |
| 1985 | 39.7°C | 32.8°C | 25.9°C | 42.4°C | 21.6°C | 9 mm | 40% | 2.8 m/s | 6.6 |
| 1984 | 37.1°C | 30.7°C | 24.4°C | 42.6°C | 19.9°C | 47 mm | 48% | 2.5 m/s | 5.6 |
| 1983 | 35.9°C | 30.0°C | 24.2°C | 40.0°C | 22.3°C | 81 mm | 62% | 2.6 m/s | — |
| 1982 | 36.9°C | 30.5°C | 24.1°C | 41.1°C | 21.1°C | 31 mm | 55% | 2.8 m/s | — |
| 1981 | 36.1°C | 29.6°C | 23.1°C | 39.6°C | 17.1°C | 47 mm | 54% | 2.7 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 36.5°C with lows near 24.3°C (mean 30.4°C), based on 45 years of NASA POWER data.
August averages 59 mm of rainfall in Mckinney, one of the drier months. The wettest on record was 158 mm in 2022.
The hottest August reached 45.4°C in 2023. The coldest dipped to 15.1°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1°C. Daytime highs moved from 37.1°C to 37.9°C and overnight lows from 24.3°C to 25.4°C over the same span.
August is one of the warmer months of the year in Mckinney and one of the drier months, so plan for around 36.5°C daytime highs and 24.3°C at night.
Not quite — August is the 12th coolest month in Mckinney, averaging 30.4°C.
For August in Mckinney, pack light, breathable clothing and sun protection, with typical highs of 36.5°C and lows of 24.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 56% — moderately humid.
Average wind speed in August is 2.5 m/s. The windiest August on record averaged 3 m/s (1989).
The wettest August on record was 2022 with 158 mm. On average, August sees 59 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 Mckinney behaves each August, 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 August specifically, along with year-by-year records and how the month has changed over the decades.
