August is one of the warmer months of the year in Rexburg, with average highs near 28°C and lows around 11.9°C (mean 20°C). It is one of the drier months, averaging 30 mm of rainfall and 44% relative humidity across the period.
August is one of the warmer months of the year in Rexburg. Across 45 years of records, the warmest Augusts in Rexburg were 2001 and 2003 — when the month averaged 22.6°C — while the coldest was 1993 at 16.2°C. Typical August days reach 28°C with nights near 11.9°C. The long-term trend is warming, about 0.2°C per decade.
August is one of the drier months in Rexburg, averaging 30 mm of rainfall. The wettest August on record was 2014 with 122 mm, while the driest was 2016 at 6 mm.
Relative humidity in Rexburg during August averages 44%. The most humid August was 2014 at 61%, and the least humid was 1988 at 26%.
August receives about 6.4 kWh/m²/day of solar energy in Rexburg. The sunniest August was 1988 at 7 kWh/m²/day, and the cloudiest was 2014 at 5.4.
Average wind speed in Rexburg during August is 2.1 m/s. The windiest August was 1985 at 2.6 m/s, while the calmest was 2017 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.5°C | 19.7°C | 20.2°C | 19.8°C | 20.9°C | +1.4°C |
| Avg High | 27.6°C | 27.8°C | 28.5°C | 27.8°C | 28.5°C | +0.9°C |
| Avg Low | 11.3°C | 11.6°C | 11.9°C | 11.9°C | 13.4°C | +2.1°C |
| Avg Rain | 26 mm | 28 mm | 24 mm | 31 mm | 46 mm | +20 mm |
August temperatures in Rexburg have risen by about 1.1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 0.7°C (1992) to a record high of 37.1°C (2000).
Rainfall in August is one of the drier months, averaging 30 mm, with a wettest year of 122 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.1°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
One of the best times to visit Rexburg
August is one of the best times to visit Rexburg. Expect days averaging 28°C and nights around 11.9°C (mean 20°C) — warmer than Rexburg's yearly average — with low rainfall (30 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 | 29.7°C | 21.8°C | 13.9°C | 34.7°C | 9.7°C | 43 mm | 38% | 2 m/s | 6.2 |
| 2024 | 28.5°C | 20.6°C | 12.7°C | 35.3°C | 4.8°C | 39 mm | 45% | 2.1 m/s | 6.3 |
| 2023 | 26.6°C | 19.9°C | 13.2°C | 33.4°C | 6.9°C | 75 mm | 58% | 2 m/s | 5.9 |
| 2022 | 29.9°C | 22.4°C | 15.0°C | 34.8°C | 11.1°C | 38 mm | 45% | 1.7 m/s | 6.2 |
| 2021 | 26.7°C | 19.3°C | 11.9°C | 34.2°C | 6.9°C | 67 mm | 48% | 2.1 m/s | 5.7 |
| 2020 | 29.4°C | 21.4°C | 13.5°C | 34.6°C | 5.3°C | 12 mm | 44% | 2 m/s | 6.7 |
| 2019 | 28.6°C | 20.6°C | 12.6°C | 32.6°C | 7.9°C | 13 mm | 46% | 2 m/s | 6.9 |
| 2018 | 26.9°C | 19.0°C | 11.2°C | 34.9°C | 1.6°C | 21 mm | 48% | 2 m/s | 6.3 |
| 2017 | 26.6°C | 19.4°C | 12.2°C | 31.5°C | 8.5°C | 19 mm | 52% | 1.5 m/s | 6.3 |
| 2016 | 28.4°C | 19.8°C | 11.2°C | 32.8°C | 5.7°C | 6 mm | 37% | 2.2 m/s | 6.8 |
| 2015 | 27.4°C | 19.6°C | 11.7°C | 32.9°C | 5.7°C | 35 mm | 48% | 2.1 m/s | 6.1 |
| 2014 🌧️ | 24.2°C | 17.7°C | 11.3°C | 31.7°C | 4.9°C | 122 mm | 61% | 1.6 m/s | 5.4 |
| 2013 | 30.4°C | 22.1°C | 13.9°C | 34.0°C | 10.7°C | 10 mm | 37% | 2.2 m/s | 6.3 |
| 2012 | 30.1°C | 21.4°C | 12.8°C | 34.3°C | 7.4°C | 9 mm | 38% | 1.9 m/s | 6.7 |
| 2011 | 28.5°C | 20.2°C | 11.9°C | 32.8°C | 7.3°C | 31 mm | 50% | 1.9 m/s | 6.8 |
| 2010 | 26.7°C | 18.5°C | 10.3°C | 32.2°C | 4.3°C | 41 mm | 47% | 2.3 m/s | 6.6 |
| 2009 | 26.1°C | 18.4°C | 10.6°C | 32.3°C | 5.7°C | 37 mm | 52% | 1.8 m/s | 6.3 |
| 2008 | 28.4°C | 19.7°C | 11.1°C | 33.1°C | 4.9°C | 21 mm | 41% | 2.2 m/s | 6.9 |
| 2007 | 29.3°C | 21.0°C | 12.6°C | 34.1°C | 7.4°C | 32 mm | 40% | 2.4 m/s | 6.3 |
| 2006 | 27.2°C | 18.9°C | 10.6°C | 32.0°C | 3.0°C | 16 mm | 43% | 2 m/s | 6.8 |
| 2005 | 27.2°C | 19.2°C | 11.3°C | 32.6°C | 5.0°C | 36 mm | 47% | 1.9 m/s | 6.6 |
| 2004 | 26.5°C | 18.7°C | 10.9°C | 33.2°C | 4.2°C | 44 mm | 46% | 2.2 m/s | 6.4 |
| 2003 | 30.9°C | 22.6°C | 14.3°C | 36.9°C | 8.8°C | 21 mm | 37% | 2.3 m/s | 6.1 |
| 2002 | 27.7°C | 19.3°C | 10.8°C | 33.0°C | 5.9°C | 11 mm | 33% | 2.5 m/s | 6.8 |
| 2001 🔥 | 31.3°C | 22.6°C | 13.9°C | 35.3°C | 9.6°C | 9 mm | 32% | 2 m/s | 6.6 |
| 2000 | 30.5°C | 21.7°C | 13.0°C | 37.1°C | 8.4°C | 17 mm | 33% | 2.5 m/s | 6.4 |
| 1999 | 28.0°C | 20.2°C | 12.3°C | 32.3°C | 6.5°C | 46 mm | 46% | 2.1 m/s | 6.2 |
| 1998 | 28.7°C | 20.6°C | 12.4°C | 32.8°C | 7.3°C | 18 mm | 46% | 1.9 m/s | 6.5 |
| 1997 | 27.0°C | 19.4°C | 11.8°C | 32.2°C | 6.9°C | 48 mm | 53% | 2.1 m/s | 6.7 |
| 1996 | 27.9°C | 19.4°C | 10.9°C | 32.3°C | 5.9°C | 14 mm | 39% | 2.1 m/s | 6.9 |
| 1995 | 27.1°C | 18.9°C | 10.7°C | 32.3°C | 5.4°C | 25 mm | 46% | 2.3 m/s | 6.8 |
| 1994 | 30.4°C | 21.8°C | 13.3°C | 35.5°C | 7.4°C | 15 mm | 34% | 2.1 m/s | 6.6 |
| 1993 ❄️ | 23.9°C | 16.2°C | 8.5°C | 30.3°C | 1.2°C | 51 mm | 54% | 2.2 m/s | 6.5 |
| 1992 | 27.8°C | 19.6°C | 11.3°C | 33.9°C | 0.7°C | 11 mm | 35% | 2.2 m/s | 6.6 |
| 1991 | 28.8°C | 20.8°C | 12.7°C | 32.4°C | 8.9°C | 30 mm | 42% | 2.1 m/s | 6.4 |
| 1990 | 28.5°C | 20.1°C | 11.7°C | 35.9°C | 8.0°C | 22 mm | 40% | 2.1 m/s | 6.2 |
| 1989 | 25.5°C | 18.0°C | 10.4°C | 31.7°C | 3.0°C | 31 mm | 44% | 2.2 m/s | 6 |
| 1988 | 29.6°C | 20.4°C | 11.2°C | 34.3°C | 7.9°C | 7 mm | 26% | 2.5 m/s | 7 |
| 1987 | 26.2°C | 17.8°C | 9.4°C | 31.5°C | 4.0°C | 16 mm | 41% | 2.1 m/s | 6.5 |
| 1986 | 28.5°C | 20.3°C | 12.1°C | 33.3°C | 7.6°C | 37 mm | 43% | 1.9 m/s | 6.3 |
| 1985 | 26.4°C | 17.7°C | 9.0°C | 33.1°C | 4.2°C | 7 mm | 36% | 2.6 m/s | 6.6 |
| 1984 | 26.7°C | 19.1°C | 11.5°C | 31.1°C | 8.1°C | 47 mm | 52% | 1.8 m/s | 5.8 |
| 1983 | 27.2°C | 20.1°C | 13.0°C | 34.0°C | 9.0°C | 51 mm | 56% | 1.8 m/s | — |
| 1982 | 28.3°C | 20.3°C | 12.2°C | 33.2°C | 8.5°C | 27 mm | 48% | 2.2 m/s | — |
| 1981 | 30.4°C | 21.5°C | 12.5°C | 34.3°C | 5.8°C | 10 mm | 34% | 2.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 28°C with lows near 11.9°C (mean 20°C), based on 45 years of NASA POWER data.
August averages 30 mm of rainfall in Rexburg, one of the drier months. The wettest on record was 122 mm in 2014.
The hottest August reached 37.1°C in 2000. The coldest dipped to 0.7°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.1°C. Daytime highs moved from 27.8°C to 28.3°C and overnight lows from 11.6°C to 13.3°C over the same span.
August is one of the warmer months of the year in Rexburg and one of the drier months, so plan for around 28°C daytime highs and 11.9°C at night.
Not quite — August is the 11th coolest month in Rexburg, averaging 20°C.
For August in Rexburg, pack light layers you can adjust through the day, with typical highs of 28°C and lows of 11.9°C.
Relative humidity in August averages 44% — relatively dry.
Average wind speed in August is 2.1 m/s. The windiest August on record averaged 2.6 m/s (1985).
The wettest August on record was 2014 with 122 mm. On average, August sees 30 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 Rexburg 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.
