August is one of the warmer months of the year in Gilbert, with average highs near 39.5°C and lows around 26.1°C (mean 32.8°C). It is a relatively wet time of year, averaging 40 mm of rainfall and 36% relative humidity across the period.
August is one of the warmer months of the year in Gilbert. Across 45 years of records, the warmest August in Gilbert was 2020 — when the month averaged 35.8°C — while the coldest was 1990 at 29.8°C. Typical August days reach 39.5°C with nights near 26.1°C. The long-term trend is warming, about 0.5°C per decade.
August is a relatively wet time of year in Gilbert, averaging 40 mm of rainfall. The wettest August on record was 1992 with 84 mm, while the driest was 2002 at 9 mm.
Relative humidity in Gilbert during August averages 36%. The most humid August was 1984 at 49%, and the least humid was 2009 at 24%.
August receives about 6.8 kWh/m²/day of solar energy in Gilbert. The sunniest August was 2009 at 7.3 kWh/m²/day, and the cloudiest was 1988 at 6.1.
Average wind speed in Gilbert during August is 1.8 m/s. The windiest Augusts were 1989 and 1996 at 2.1 m/s, while the calmest were 2018, 2021 and 2022, among others at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 32.0°C | 32.6°C | 32.5°C | 33.2°C | 34.1°C | +2.1°C |
| Avg High | 38.5°C | 39.3°C | 39.1°C | 40.0°C | 41.1°C | +2.6°C |
| Avg Low | 25.4°C | 25.9°C | 25.9°C | 26.5°C | 27.2°C | +1.8°C |
| Avg Rain | 46 mm | 46 mm | 36 mm | 34 mm | 39 mm | -7 mm |
August temperatures in Gilbert have risen by about 1.6°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 17.9°C (1990) to a record high of 47.9°C (2025).
Rainfall in August is a relatively wet time of year, averaging 40 mm, with a wettest year of 84 mm.
A quieter season to visit Gilbert
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting Gilbert. That said, August — with days averaging 39.5°C and nights around 26.1°C (mean 32.8°C) and moderate rainfall (40 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 42.1°C | 34.5°C | 27.0°C | 47.9°C | 24.2°C | 29 mm | 26% | 1.9 m/s | 7 |
| 2024 | 41.6°C | 34.6°C | 27.6°C | 46.1°C | 24.2°C | 30 mm | 31% | 1.9 m/s | 6.8 |
| 2023 | 42.2°C | 35.3°C | 28.4°C | 46.2°C | 24.2°C | 15 mm | 28% | 2 m/s | 6.7 |
| 2022 | 38.9°C | 32.5°C | 26.1°C | 42.9°C | 22.9°C | 63 mm | 45% | 1.6 m/s | 6.5 |
| 2021 | 38.5°C | 32.0°C | 25.6°C | 44.7°C | 21.3°C | 82 mm | 43% | 1.6 m/s | 6.7 |
| 2020 🔥 | 43.2°C | 35.8°C | 28.3°C | 46.0°C | 25.0°C | 17 mm | 25% | 2 m/s | 7 |
| 2019 | 42.1°C | 34.6°C | 27.2°C | 45.9°C | 25.3°C | 12 mm | 27% | 1.9 m/s | 7.1 |
| 2018 | 39.5°C | 33.0°C | 26.5°C | 45.7°C | 23.7°C | 50 mm | 38% | 1.6 m/s | 6.9 |
| 2017 | 39.9°C | 33.0°C | 26.1°C | 43.3°C | 20.8°C | 21 mm | 32% | 1.7 m/s | 7.1 |
| 2016 | 38.5°C | 32.2°C | 25.9°C | 42.7°C | 22.2°C | 43 mm | 39% | 1.7 m/s | 6.8 |
| 2015 | 40.6°C | 33.9°C | 27.2°C | 45.6°C | 25.0°C | 29 mm | 33% | 1.9 m/s | 6.9 |
| 2014 | 37.8°C | 31.3°C | 24.7°C | 41.7°C | 21.9°C | 62 mm | 40% | 1.6 m/s | 6.8 |
| 2013 | 39.5°C | 32.8°C | 26.1°C | 44.8°C | 22.4°C | 24 mm | 32% | 1.8 m/s | 6.2 |
| 2012 | 40.2°C | 33.6°C | 27.0°C | 46.1°C | 24.9°C | 47 mm | 37% | 1.6 m/s | 6.8 |
| 2011 | 42.4°C | 35.3°C | 28.2°C | 45.7°C | 26.2°C | 12 mm | 27% | 1.8 m/s | 7 |
| 2010 | 39.0°C | 32.5°C | 26.1°C | 43.7°C | 19.1°C | 38 mm | 38% | 1.8 m/s | 6.9 |
| 2009 | 40.8°C | 33.4°C | 25.9°C | 44.3°C | 20.5°C | 16 mm | 24% | 1.9 m/s | 7.3 |
| 2008 | 37.6°C | 31.8°C | 26.0°C | 44.2°C | 22.6°C | 74 mm | 43% | 1.6 m/s | 6.9 |
| 2007 | 39.4°C | 33.2°C | 26.9°C | 43.9°C | 22.8°C | 29 mm | 40% | 1.6 m/s | 6.7 |
| 2006 | 37.3°C | 31.4°C | 25.4°C | 40.8°C | 21.3°C | 44 mm | 43% | 1.6 m/s | 6.7 |
| 2005 | 37.9°C | 31.6°C | 25.3°C | 44.0°C | 22.0°C | 46 mm | 43% | 1.6 m/s | 6.7 |
| 2004 | 39.5°C | 32.3°C | 25.2°C | 44.5°C | 20.9°C | 25 mm | 30% | 1.8 m/s | 6.8 |
| 2003 | 39.3°C | 32.9°C | 26.6°C | 46.6°C | 22.2°C | 40 mm | 38% | 1.9 m/s | 6.8 |
| 2002 | 41.1°C | 33.5°C | 26.0°C | 44.3°C | 21.4°C | 9 mm | 24% | 2 m/s | 7 |
| 2001 | 39.3°C | 32.5°C | 25.7°C | 44.4°C | 22.4°C | 31 mm | 37% | 1.7 m/s | 6.8 |
| 2000 | 39.2°C | 32.7°C | 26.1°C | 45.2°C | 20.2°C | 41 mm | 37% | 1.8 m/s | 6.5 |
| 1999 | 39.9°C | 32.7°C | 25.6°C | 44.6°C | 21.5°C | 33 mm | 32% | 1.8 m/s | 6.6 |
| 1998 | 40.7°C | 34.0°C | 27.3°C | 45.0°C | 24.4°C | 28 mm | 34% | 1.9 m/s | 6.9 |
| 1997 | 39.1°C | 32.8°C | 26.5°C | 44.0°C | 23.7°C | 52 mm | 40% | 1.8 m/s | 6.6 |
| 1996 | 40.3°C | 33.4°C | 26.6°C | 44.4°C | 21.2°C | 24 mm | 35% | 2.1 m/s | 7.2 |
| 1995 | 40.5°C | 33.8°C | 27.1°C | 46.2°C | 24.0°C | 54 mm | 38% | 1.8 m/s | 6.9 |
| 1994 | 41.1°C | 34.4°C | 27.7°C | 45.4°C | 26.0°C | 20 mm | 33% | 2 m/s | 6.9 |
| 1993 | 38.7°C | 32.1°C | 25.5°C | 45.1°C | 21.6°C | 64 mm | 37% | 1.9 m/s | 6.5 |
| 1992 🌧️ | 37.4°C | 31.1°C | 24.8°C | 43.7°C | 18.9°C | 84 mm | 45% | 1.7 m/s | 6.7 |
| 1991 | 39.0°C | 32.3°C | 25.5°C | 43.5°C | 23.4°C | 26 mm | 33% | 1.9 m/s | 6.5 |
| 1990 ❄️ | 36.8°C | 29.8°C | 22.8°C | 42.2°C | 17.9°C | 71 mm | 42% | 2 m/s | 6.8 |
| 1989 | 38.7°C | 31.6°C | 24.6°C | 42.1°C | 18.9°C | 24 mm | 35% | 2.1 m/s | 7.2 |
| 1988 | 38.1°C | 31.7°C | 25.3°C | 43.8°C | 22.1°C | 73 mm | 44% | 2 m/s | 6.1 |
| 1987 | 37.7°C | 31.1°C | 24.4°C | 42.2°C | 19.8°C | 33 mm | 37% | 1.8 m/s | 6.9 |
| 1986 | 38.5°C | 32.3°C | 26.2°C | 43.5°C | 23.7°C | 54 mm | 41% | 1.7 m/s | 6.6 |
| 1985 | 40.7°C | 33.4°C | 26.1°C | 45.4°C | 22.6°C | 20 mm | 30% | 1.9 m/s | 6.9 |
| 1984 | 36.5°C | 30.6°C | 24.7°C | 42.6°C | 21.4°C | 54 mm | 49% | 1.6 m/s | 6.2 |
| 1983 | 37.5°C | 31.1°C | 24.7°C | 43.1°C | 20.6°C | 78 mm | 47% | 1.7 m/s | — |
| 1982 | 38.1°C | 32.0°C | 25.9°C | 43.3°C | 23.1°C | 59 mm | 44% | 1.7 m/s | — |
| 1981 | 41.0°C | 34.1°C | 27.1°C | 44.9°C | 23.7°C | 21 mm | 31% | 2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 39.5°C with lows near 26.1°C (mean 32.8°C), based on 45 years of NASA POWER data.
August averages 40 mm of rainfall in Gilbert, a relatively wet time of year. The wettest on record was 84 mm in 1992.
The hottest August reached 47.9°C in 2025. The coldest dipped to 17.9°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.6°C. Daytime highs moved from 38.8°C to 40.7°C and overnight lows from 25.7°C to 26.9°C over the same span.
August is one of the warmer months of the year in Gilbert and a relatively wet time of year, so plan for around 39.5°C daytime highs and 26.1°C at night.
Not quite — August is the 11th coolest month in Gilbert, averaging 32.8°C.
For August in Gilbert, pack light, breathable clothing and sun protection, with typical highs of 39.5°C and lows of 26.1°C.
Relative humidity in August averages 36% — relatively dry.
Average wind speed in August is 1.8 m/s. The windiest August on record averaged 2.1 m/s (1989).
The wettest August on record was 1992 with 84 mm. On average, August sees 40 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 Gilbert 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.
