August is one of the warmer months of the year in Granby, with average highs near 23.5°C and lows around 13.7°C (mean 18.6°C). It is a relatively wet time of year, averaging 110 mm of rainfall and 82% relative humidity across the period.
August is one of the warmer months of the year in Granby. Across 45 years of records, the warmest August in Granby was 2021 — when the month averaged 21.9°C — while the coldest was 1982 at 15.8°C. Typical August days reach 23.5°C with nights near 13.7°C. The long-term trend is warming, about 0.4°C per decade.
August is a relatively wet time of year in Granby, averaging 110 mm of rainfall. The wettest August on record was 2006 with 189 mm, while the driest was 2002 at 41 mm.
Relative humidity in Granby during August averages 82%. The most humid August was 2004 at 85%, and the least humid was 2021 at 76%.
August receives about 5 kWh/m²/day of solar energy in Granby. The sunniest August was 2002 at 5.6 kWh/m²/day, and the cloudiest was 1988 at 4.4.
Average wind speed in Granby during August is 0.3 m/s. The windiest Augusts were 2023, 2024 and 2025, among others at 0.3 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.6°C | 18.3°C | 18.7°C | 19.2°C | 19.4°C | +1.8°C |
| Avg High | 22.7°C | 23.3°C | 23.5°C | 24.0°C | 24.4°C | +1.7°C |
| Avg Low | 12.6°C | 13.2°C | 13.9°C | 14.4°C | 14.4°C | +1.8°C |
| Avg Rain | 116 mm | 107 mm | 114 mm | 104 mm | 109 mm | -8 mm |
August temperatures in Granby have risen by about 1.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 3.1°C (1982) to a record high of 35°C (1984).
Rainfall in August is a relatively wet time of year, averaging 110 mm, with a wettest year of 189 mm.
One of the best times to visit Granby
August is one of the best times to visit Granby. Expect days averaging 23.5°C and nights around 13.7°C (mean 18.6°C) — warmer than Granby's yearly average — with higher rainfall (110 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 | 24.0°C | 18.6°C | 13.1°C | 30.0°C | 7.0°C | 122 mm | 77% | 0.3 m/s | 5.4 |
| 2024 | 23.9°C | 19.1°C | 14.3°C | 32.5°C | 7.4°C | 138 mm | 83% | 0.3 m/s | 4.5 |
| 2023 | 22.6°C | 18.0°C | 13.4°C | 26.1°C | 8.3°C | 110 mm | 84% | 0.3 m/s | 4.6 |
| 2022 | 25.2°C | 20.0°C | 14.9°C | 31.4°C | 10.2°C | 109 mm | 78% | 0.3 m/s | 4.9 |
| 2021 🔥 | 27.1°C | 21.9°C | 16.8°C | 32.1°C | 11.3°C | 53 mm | 76% | 0.3 m/s | 4.9 |
| 2020 | 23.4°C | 18.8°C | 14.2°C | 29.4°C | 8.2°C | 118 mm | 82% | 0.3 m/s | 5.1 |
| 2019 | 23.8°C | 18.8°C | 13.8°C | 27.4°C | 9.9°C | 112 mm | 81% | 0.3 m/s | 5.4 |
| 2018 | 25.9°C | 20.9°C | 15.9°C | 29.9°C | 8.8°C | 84 mm | 82% | 0.3 m/s | 4.9 |
| 2017 | 22.7°C | 18.1°C | 13.5°C | 27.1°C | 9.1°C | 91 mm | 81% | 0.3 m/s | 5.3 |
| 2016 | 25.2°C | 20.5°C | 15.8°C | 28.9°C | 10.7°C | 122 mm | 81% | 0.3 m/s | 5.1 |
| 2015 | 23.8°C | 19.2°C | 14.7°C | 29.3°C | 9.8°C | 78 mm | 84% | 0.3 m/s | 5 |
| 2014 | 23.3°C | 18.5°C | 13.7°C | 30.5°C | 9.3°C | 84 mm | 83% | 0.3 m/s | 5.1 |
| 2013 | 23.0°C | 18.2°C | 13.4°C | 27.2°C | 9.2°C | 85 mm | 82% | 0.3 m/s | 5.2 |
| 2012 | 24.8°C | 19.9°C | 15.0°C | 28.9°C | 8.8°C | 85 mm | 81% | 0.3 m/s | 5.1 |
| 2011 | 23.4°C | 18.9°C | 14.4°C | 27.2°C | 9.3°C | 178 mm | 84% | 0.3 m/s | 4.8 |
| 2010 | 23.8°C | 18.9°C | 13.9°C | 29.9°C | 8.2°C | 118 mm | 83% | 0.3 m/s | 5.1 |
| 2009 | 23.7°C | 19.1°C | 14.5°C | 29.2°C | 7.3°C | 75 mm | 84% | 0.3 m/s | 5 |
| 2008 | 22.6°C | 18.1°C | 13.6°C | 26.9°C | 8.8°C | 124 mm | 84% | 0.3 m/s | 5 |
| 2007 | 23.1°C | 17.8°C | 12.5°C | 29.3°C | 6.3°C | 110 mm | 81% | 0.3 m/s | 5.2 |
| 2006 🌧️ | 21.9°C | 17.3°C | 12.6°C | 29.8°C | 6.4°C | 189 mm | 82% | 0.3 m/s | 5.2 |
| 2005 | 24.3°C | 19.5°C | 14.6°C | 28.2°C | 8.2°C | 131 mm | 82% | 0.3 m/s | 5 |
| 2004 | 22.7°C | 18.0°C | 13.3°C | 26.9°C | 7.3°C | 136 mm | 85% | 0.3 m/s | 4.6 |
| 2003 | 24.4°C | 19.8°C | 15.2°C | 29.0°C | 7.3°C | 106 mm | 83% | 0.3 m/s | 4.6 |
| 2002 | 24.3°C | 19.4°C | 14.5°C | 30.3°C | 8.2°C | 41 mm | 81% | 0.3 m/s | 5.6 |
| 2001 | 25.3°C | 20.0°C | 14.7°C | 31.9°C | 8.4°C | 109 mm | 79% | 0.3 m/s | 5.3 |
| 2000 | 22.6°C | 17.8°C | 13.0°C | 27.1°C | 7.1°C | 124 mm | 84% | 0.3 m/s | 4.7 |
| 1999 | 22.6°C | 17.8°C | 13.0°C | 28.0°C | 7.6°C | 89 mm | 81% | 0.3 m/s | 5.1 |
| 1998 | 23.9°C | 19.1°C | 14.3°C | 29.5°C | 8.2°C | 113 mm | 81% | 0.3 m/s | 5.1 |
| 1997 | 22.4°C | 17.5°C | 12.5°C | 28.2°C | 7.9°C | 99 mm | 80% | 0.3 m/s | 5 |
| 1996 | 23.6°C | 18.3°C | 13.1°C | 28.3°C | 6.9°C | 59 mm | 81% | 0.3 m/s | 5.3 |
| 1995 | 24.0°C | 18.5°C | 12.9°C | 29.1°C | 6.8°C | 104 mm | 79% | 0.3 m/s | 5.3 |
| 1994 | 22.1°C | 17.1°C | 12.1°C | 27.0°C | 6.9°C | 91 mm | 82% | 0.3 m/s | 5 |
| 1993 | 24.2°C | 19.2°C | 14.3°C | 28.2°C | 8.7°C | 94 mm | 83% | 0.3 m/s | 5.2 |
| 1992 | 22.1°C | 17.3°C | 12.5°C | 27.6°C | 7.6°C | 118 mm | 84% | 0.3 m/s | 4.7 |
| 1991 | 23.8°C | 19.0°C | 14.2°C | 28.7°C | 7.8°C | 153 mm | 83% | 0.3 m/s | 4.9 |
| 1990 | 24.0°C | 18.8°C | 13.5°C | 28.0°C | 7.0°C | 149 mm | 83% | 0.3 m/s | 5.2 |
| 1989 | 22.3°C | 17.5°C | 12.7°C | 30.7°C | 4.7°C | 137 mm | 82% | 0.3 m/s | 5.1 |
| 1988 | 23.5°C | 18.8°C | 14.1°C | 30.5°C | 5.9°C | 166 mm | 83% | 0.3 m/s | 4.4 |
| 1987 | 22.5°C | 16.9°C | 11.4°C | 30.1°C | 5.3°C | 57 mm | 78% | 0.3 m/s | 5 |
| 1986 | 22.1°C | 16.9°C | 11.7°C | 28.5°C | 3.5°C | 136 mm | 83% | 0.3 m/s | 4.8 |
| 1985 | 22.0°C | 16.9°C | 11.7°C | 26.3°C | 5.8°C | 74 mm | 81% | 0.3 m/s | 4.7 |
| 1984 | 24.6°C | 19.8°C | 15.1°C | 35.0°C | 7.2°C | 99 mm | 82% | 0.3 m/s | 5.4 |
| 1983 | 23.7°C | 18.6°C | 13.5°C | 29.8°C | 6.7°C | 107 mm | 81% | 0.3 m/s | — |
| 1982 ❄️ | 21.0°C | 15.8°C | 10.6°C | 30.7°C | 3.1°C | 135 mm | 80% | 0.3 m/s | — |
| 1981 | 22.7°C | 17.6°C | 12.5°C | 28.8°C | 6.1°C | 134 mm | 82% | 0.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 23.5°C with lows near 13.7°C (mean 18.6°C), based on 45 years of NASA POWER data.
August averages 110 mm of rainfall in Granby, a relatively wet time of year. The wettest on record was 189 mm in 2006.
The hottest August reached 35°C in 1984. The coldest dipped to 3.1°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.8°C. Daytime highs moved from 22.8°C to 24.6°C and overnight lows from 12.7°C to 14.5°C over the same span.
August is one of the warmer months of the year in Granby and a relatively wet time of year, so plan for around 23.5°C daytime highs and 13.7°C at night.
Not quite — August is the 11th coolest month in Granby, averaging 18.6°C.
For August in Granby, pack light layers you can adjust through the day, with typical highs of 23.5°C and lows of 13.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 82% — quite humid.
Average wind speed in August is 0.3 m/s. The windiest August on record averaged 0.3 m/s (1981).
The wettest August on record was 2006 with 189 mm. On average, August sees 110 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 Granby 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.
