August is one of the warmer months of the year in Lethbridge, with average highs near 25.7°C and lows around 11.5°C (mean 18.6°C). It is about average for rainfall, averaging 41 mm of rainfall and 54% relative humidity across the period.
August is one of the warmer months of the year in Lethbridge. Across 45 years of records, the warmest August in Lethbridge was 2022 — when the month averaged 22°C — while the coldest was 1987 at 14.7°C. Typical August days reach 25.7°C with nights near 11.5°C. The long-term trend is warming, about 0.4°C per decade.
August is about average for rainfall in Lethbridge, averaging 41 mm of rainfall. The wettest August on record was 2005 with 96 mm, while the driest was 2001 at 4 mm.
Relative humidity in Lethbridge during August averages 54%. The most humid August was 1993 at 68%, and the least humid was 2001 at 37%.
August receives about 5.6 kWh/m²/day of solar energy in Lethbridge. The sunniest August was 2001 at 6.3 kWh/m²/day, and the cloudiest were 2004 and 2021 at 5.
Average wind speed in Lethbridge during August is 2 m/s. The windiest August was 1995 at 2.5 m/s, while the calmest was 1981 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.0°C | 18.3°C | 18.5°C | 18.6°C | 20.1°C | +2.1°C |
| Avg High | 25.1°C | 25.3°C | 25.9°C | 25.6°C | 27.1°C | +2°C |
| Avg Low | 10.9°C | 11.3°C | 11.2°C | 11.6°C | 13.2°C | +2.3°C |
| Avg Rain | 43 mm | 40 mm | 40 mm | 40 mm | 41 mm | -2 mm |
August temperatures in Lethbridge have risen by about 1.5°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -6.5°C (1992) to a record high of 38.2°C (2018).
Rainfall in August is about average for rainfall, averaging 41 mm, with a wettest year of 96 mm.
One of the best times to visit Lethbridge
August is one of the best times to visit Lethbridge. Expect days averaging 25.7°C and nights around 11.5°C (mean 18.6°C) — warmer than Lethbridge's yearly average — with moderate rainfall (41 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 | 26.4°C | 19.7°C | 13.1°C | 31.8°C | 9.1°C | 38 mm | 58% | 1.8 m/s | 5.6 |
| 2024 | 25.8°C | 19.3°C | 12.7°C | 35.7°C | 7.8°C | 67 mm | 56% | 2 m/s | 5.4 |
| 2023 | 27.7°C | 20.6°C | 13.4°C | 36.2°C | 7.5°C | 39 mm | 50% | 1.9 m/s | 5.7 |
| 2022 🔥 | 29.1°C | 22.0°C | 14.8°C | 34.8°C | 8.4°C | 33 mm | 49% | 2 m/s | 6 |
| 2021 | 25.7°C | 19.0°C | 12.4°C | 34.9°C | 5.7°C | 53 mm | 53% | 2.2 m/s | 5 |
| 2020 | 27.9°C | 20.2°C | 12.5°C | 34.3°C | 7.4°C | 14 mm | 45% | 2.2 m/s | 6.2 |
| 2019 | 25.5°C | 18.3°C | 11.2°C | 33.4°C | 6.7°C | 48 mm | 58% | 1.8 m/s | 5.5 |
| 2018 | 26.4°C | 19.1°C | 11.9°C | 38.2°C | 5.5°C | 29 mm | 49% | 2.2 m/s | 5.3 |
| 2017 | 26.9°C | 19.5°C | 12.0°C | 34.7°C | 7.8°C | 13 mm | 49% | 1.8 m/s | 5.3 |
| 2016 | 24.2°C | 17.7°C | 11.1°C | 31.3°C | 6.3°C | 58 mm | 59% | 1.9 m/s | 5.3 |
| 2015 | 26.6°C | 19.2°C | 11.8°C | 35.1°C | 3.4°C | 31 mm | 50% | 1.9 m/s | 5.4 |
| 2014 | 24.4°C | 18.2°C | 11.9°C | 32.0°C | 6.1°C | 69 mm | 64% | 1.8 m/s | 5.2 |
| 2013 | 25.7°C | 19.0°C | 12.2°C | 31.8°C | 9.1°C | 47 mm | 59% | 1.7 m/s | 5.5 |
| 2012 | 27.2°C | 19.3°C | 11.5°C | 33.0°C | 6.0°C | 38 mm | 52% | 1.9 m/s | 6 |
| 2011 | 26.4°C | 19.1°C | 11.8°C | 31.1°C | 6.3°C | 17 mm | 52% | 1.9 m/s | 6.2 |
| 2010 | 23.1°C | 16.7°C | 10.2°C | 33.1°C | 1.2°C | 53 mm | 60% | 2 m/s | 5.5 |
| 2009 | 24.5°C | 17.7°C | 10.8°C | 33.2°C | 5.1°C | 43 mm | 58% | 2 m/s | 5.2 |
| 2008 | 26.0°C | 18.8°C | 11.5°C | 35.5°C | 5.8°C | 35 mm | 49% | 2.4 m/s | 5.7 |
| 2007 | 26.5°C | 18.7°C | 10.9°C | 33.2°C | 4.4°C | 14 mm | 47% | 2 m/s | 5.8 |
| 2006 | 25.9°C | 18.4°C | 10.8°C | 34.3°C | 6.5°C | 31 mm | 50% | 1.7 m/s | 6 |
| 2005 🌧️ | 23.0°C | 16.2°C | 9.5°C | 31.2°C | 4.1°C | 96 mm | 62% | 2 m/s | 5.7 |
| 2004 | 24.3°C | 17.8°C | 11.4°C | 32.7°C | 8.4°C | 82 mm | 63% | 1.8 m/s | 5 |
| 2003 | 29.7°C | 21.5°C | 13.4°C | 35.9°C | 7.2°C | 14 mm | 42% | 1.9 m/s | 5.7 |
| 2002 | 22.7°C | 16.0°C | 9.3°C | 29.7°C | 4.2°C | 53 mm | 60% | 1.7 m/s | 5.3 |
| 2001 | 29.3°C | 21.0°C | 12.8°C | 36.4°C | 8.6°C | 4 mm | 37% | 2.2 m/s | 6.3 |
| 2000 | 27.0°C | 19.2°C | 11.4°C | 34.6°C | 4.7°C | 30 mm | 45% | 2.1 m/s | 6 |
| 1999 | 27.0°C | 19.8°C | 12.5°C | 33.8°C | 7.0°C | 29 mm | 52% | 2.2 m/s | 5.6 |
| 1998 | 28.1°C | 20.6°C | 13.2°C | 33.5°C | 8.7°C | 18 mm | 47% | 2 m/s | 6.2 |
| 1997 | 24.8°C | 17.9°C | 11.0°C | 32.9°C | 4.1°C | 49 mm | 58% | 1.9 m/s | 5.8 |
| 1996 | 26.4°C | 19.1°C | 11.7°C | 32.1°C | 7.3°C | 12 mm | 48% | 2.4 m/s | 5.9 |
| 1995 | 22.9°C | 16.0°C | 9.1°C | 29.1°C | 6.3°C | 43 mm | 57% | 2.5 m/s | 5.7 |
| 1994 | 26.4°C | 19.1°C | 11.8°C | 34.8°C | 3.0°C | 19 mm | 50% | 1.7 m/s | 5.5 |
| 1993 | 21.1°C | 15.1°C | 9.1°C | 26.5°C | 3.7°C | 77 mm | 68% | 1.9 m/s | 5.5 |
| 1992 | 22.8°C | 15.8°C | 8.8°C | 31.9°C | -6.5°C | 65 mm | 58% | 2 m/s | 5.7 |
| 1991 | 27.0°C | 20.0°C | 12.9°C | 34.0°C | 8.6°C | 49 mm | 55% | 1.9 m/s | 5.8 |
| 1990 | 26.1°C | 19.3°C | 12.5°C | 33.8°C | 6.5°C | 42 mm | 57% | 2.1 m/s | 5.8 |
| 1989 | 22.9°C | 16.9°C | 10.9°C | 31.3°C | 5.0°C | 76 mm | 60% | 2 m/s | 5.1 |
| 1988 | 26.2°C | 18.5°C | 10.7°C | 32.5°C | 6.9°C | 34 mm | 46% | 2.1 m/s | 5.5 |
| 1987 ❄️ | 21.4°C | 14.7°C | 8.1°C | 30.5°C | 4.5°C | 80 mm | 62% | 1.9 m/s | 5.2 |
| 1986 | 26.8°C | 19.1°C | 11.5°C | 32.3°C | 6.8°C | 22 mm | 49% | 1.9 m/s | 5.8 |
| 1985 | 23.0°C | 15.9°C | 8.8°C | 30.5°C | 3.3°C | 81 mm | 56% | 1.9 m/s | 5.5 |
| 1984 | 27.4°C | 19.7°C | 12.1°C | 34.1°C | 4.6°C | 23 mm | 47% | 2.2 m/s | 5.6 |
| 1983 | 27.4°C | 20.2°C | 12.9°C | 33.7°C | 8.3°C | 24 mm | 55% | 2 m/s | — |
| 1982 | 24.1°C | 17.2°C | 10.2°C | 29.3°C | 6.1°C | 34 mm | 56% | 2.3 m/s | — |
| 1981 | 27.1°C | 19.9°C | 12.6°C | 31.4°C | 7.0°C | 15 mm | 54% | 1.6 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 25.7°C with lows near 11.5°C (mean 18.6°C), based on 45 years of NASA POWER data.
August averages 41 mm of rainfall in Lethbridge, about average for rainfall. The wettest on record was 96 mm in 2005.
The hottest August reached 38.2°C in 2018. The coldest dipped to -6.5°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.5°C. Daytime highs moved from 25.8°C to 26.9°C and overnight lows from 11.3°C to 13.3°C over the same span.
August is one of the warmer months of the year in Lethbridge and about average for rainfall, so plan for around 25.7°C daytime highs and 11.5°C at night.
Not quite — August is the 11th coolest month in Lethbridge, averaging 18.6°C.
For August in Lethbridge, pack light layers you can adjust through the day, with typical highs of 25.7°C and lows of 11.5°C.
Relative humidity in August averages 54% — relatively dry.
Average wind speed in August is 2 m/s. The windiest August on record averaged 2.5 m/s (1995).
The wettest August on record was 2005 with 96 mm. On average, August sees 41 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 Lethbridge 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.
