August is one of the warmer months of the year in Yellowknife, with average highs near 18.3°C and lows around 10.9°C (mean 14.6°C). It is a relatively wet time of year, averaging 52 mm of rainfall and 69% relative humidity across the period.
August is one of the warmer months of the year in Yellowknife. Across 45 years of records, the warmest August in Yellowknife was 1989 — when the month averaged 18.7°C — while the coldest was 2019 at 11.2°C. Typical August days reach 18.3°C with nights near 10.9°C. The long-term August temperature trend is broadly flat.
August is a relatively wet time of year in Yellowknife, averaging 52 mm of rainfall. The wettest August on record was 2001 with 109 mm, while the driest was 1992 at 12 mm.
Relative humidity in Yellowknife during August averages 69%. The most humid August was 2019 at 79%, and the least humid was 1994 at 58%.
August receives about 4.1 kWh/m²/day of solar energy in Yellowknife. The sunniest Augusts were 1989 and 1992 at 4.6 kWh/m²/day, and the cloudiest was 2019 at 3.6.
Average wind speed in Yellowknife during August is 3.9 m/s. The windiest August was 2020 at 4.5 m/s, while the calmest were 1993, 2013 and 2016 at 3.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.7°C | 15.0°C | 13.5°C | 14.7°C | 15.2°C | +0.5°C |
| Avg High | 18.5°C | 19.0°C | 17.1°C | 18.3°C | 19.0°C | +0.5°C |
| Avg Low | 10.9°C | 11.1°C | 10.0°C | 11.1°C | 11.4°C | +0.5°C |
| Avg Rain | 47 mm | 47 mm | 67 mm | 48 mm | 53 mm | +5 mm |
August temperatures in Yellowknife have risen by about 0.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 0.2°C (1982) to a record high of 30.6°C (1989).
Rainfall in August is a relatively wet time of year, averaging 52 mm, with a wettest year of 109 mm.
One of the best times to visit Yellowknife
August is one of the best times to visit Yellowknife. Expect days averaging 18.3°C and nights around 10.9°C (mean 14.6°C) — warmer than Yellowknife's yearly average — with moderate rainfall (52 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 | 20.0°C | 16.1°C | 12.2°C | 26.0°C | 6.6°C | 45 mm | 70% | 3.5 m/s | 4.2 |
| 2024 | 18.9°C | 15.2°C | 11.6°C | 28.4°C | 7.9°C | 58 mm | 70% | 4.1 m/s | 4.2 |
| 2023 | 19.8°C | 16.0°C | 12.1°C | 24.6°C | 7.8°C | 41 mm | 69% | 3.5 m/s | 3.9 |
| 2022 | 19.8°C | 15.8°C | 11.7°C | 28.0°C | 7.2°C | 63 mm | 68% | 3.6 m/s | 4.5 |
| 2021 | 17.8°C | 13.8°C | 9.9°C | 29.9°C | 4.1°C | 38 mm | 73% | 3.7 m/s | 4 |
| 2020 | 17.6°C | 14.3°C | 11.1°C | 26.7°C | 3.0°C | 71 mm | 76% | 4.5 m/s | 3.8 |
| 2019 ❄️ | 14.4°C | 11.2°C | 8.1°C | 22.0°C | 1.8°C | 52 mm | 79% | 4 m/s | 3.6 |
| 2018 | 15.9°C | 12.6°C | 9.2°C | 24.2°C | 3.5°C | 74 mm | 77% | 3.7 m/s | 4 |
| 2017 | 21.3°C | 17.5°C | 13.6°C | 29.8°C | 6.5°C | 45 mm | 67% | 3.9 m/s | 4.2 |
| 2016 | 19.7°C | 15.7°C | 11.8°C | 25.6°C | 5.0°C | 24 mm | 63% | 3.4 m/s | 4.4 |
| 2015 | 18.4°C | 14.9°C | 11.5°C | 24.5°C | 4.3°C | 53 mm | 68% | 4 m/s | 4.3 |
| 2014 | 17.8°C | 14.0°C | 10.1°C | 27.5°C | 2.9°C | 53 mm | 67% | 3.8 m/s | 3.7 |
| 2013 | 19.4°C | 15.6°C | 11.9°C | 26.4°C | 3.3°C | 31 mm | 65% | 3.4 m/s | 4.2 |
| 2012 | 19.9°C | 16.3°C | 12.7°C | 25.9°C | 7.2°C | 49 mm | 68% | 3.8 m/s | 3.9 |
| 2011 | 17.6°C | 14.4°C | 11.3°C | 24.3°C | 4.0°C | 69 mm | 72% | 4 m/s | 4.2 |
| 2010 | 18.2°C | 14.8°C | 11.3°C | 23.5°C | 5.0°C | 34 mm | 66% | 3.8 m/s | 3.9 |
| 2009 | 17.9°C | 14.2°C | 10.4°C | 23.5°C | 6.8°C | 57 mm | 73% | 4.1 m/s | 4 |
| 2008 | 19.0°C | 15.2°C | 11.4°C | 28.7°C | 3.1°C | 72 mm | 69% | 4.1 m/s | 3.9 |
| 2007 | 15.2°C | 11.8°C | 8.4°C | 21.9°C | 2.4°C | 32 mm | 69% | 3.7 m/s | 4.1 |
| 2006 | 18.5°C | 15.1°C | 11.8°C | 23.5°C | 6.6°C | 75 mm | 69% | 3.5 m/s | 4.2 |
| 2005 | 16.5°C | 13.0°C | 9.4°C | 24.1°C | 2.5°C | 68 mm | 74% | 4.3 m/s | 3.9 |
| 2004 | 16.4°C | 12.8°C | 9.2°C | 24.4°C | 2.9°C | 15 mm | 64% | 3.6 m/s | 4.2 |
| 2003 | 18.7°C | 14.6°C | 10.6°C | 27.9°C | 4.2°C | 80 mm | 70% | 4.2 m/s | 4.2 |
| 2002 | 15.7°C | 12.3°C | 8.9°C | 21.9°C | 0.5°C | 69 mm | 75% | 3.9 m/s | 4.1 |
| 2001 🌧️ | 17.1°C | 13.6°C | 10.1°C | 26.8°C | 3.9°C | 109 mm | 76% | 4.3 m/s | 3.8 |
| 2000 | 15.8°C | 12.7°C | 9.6°C | 26.8°C | 1.9°C | 93 mm | 69% | 3.7 m/s | 4 |
| 1999 | 19.6°C | 15.5°C | 11.4°C | 27.5°C | 1.2°C | 43 mm | 64% | 4 m/s | 4.3 |
| 1998 | 20.3°C | 16.6°C | 12.9°C | 28.2°C | 7.8°C | 69 mm | 69% | 4.2 m/s | 4.1 |
| 1997 | 19.7°C | 15.8°C | 12.0°C | 28.6°C | 0.2°C | 48 mm | 68% | 3.6 m/s | 4.4 |
| 1996 | 18.7°C | 14.9°C | 11.1°C | 23.4°C | 2.8°C | 49 mm | 68% | 3.7 m/s | 3.8 |
| 1995 | 17.2°C | 13.7°C | 10.2°C | 24.5°C | 3.7°C | 38 mm | 67% | 4 m/s | 3.9 |
| 1994 | 21.5°C | 17.2°C | 13.0°C | 30.4°C | 5.4°C | 40 mm | 58% | 3.8 m/s | 4.5 |
| 1993 | 18.6°C | 14.7°C | 10.7°C | 25.9°C | 4.6°C | 45 mm | 66% | 3.4 m/s | 4.2 |
| 1992 | 18.2°C | 13.9°C | 9.6°C | 27.1°C | 1.1°C | 12 mm | 62% | 4.4 m/s | 4.6 |
| 1991 | 19.0°C | 15.2°C | 11.3°C | 28.1°C | 1.0°C | 47 mm | 67% | 4.1 m/s | 4.2 |
| 1990 | 16.7°C | 12.7°C | 8.8°C | 26.5°C | 4.6°C | 75 mm | 70% | 3.9 m/s | 3.8 |
| 1989 🔥 | 22.5°C | 18.7°C | 14.8°C | 30.6°C | 5.9°C | 12 mm | 64% | 3.5 m/s | 4.6 |
| 1988 | 19.1°C | 15.4°C | 11.7°C | 22.7°C | 6.1°C | 51 mm | 77% | 4.1 m/s | 4 |
| 1987 | 15.9°C | 12.0°C | 8.1°C | 20.8°C | 1.2°C | 46 mm | 65% | 4.1 m/s | 4.3 |
| 1986 | 17.4°C | 13.7°C | 10.1°C | 26.8°C | 0.9°C | 70 mm | 71% | 3.6 m/s | 4.1 |
| 1985 | 15.2°C | 11.6°C | 7.9°C | 20.4°C | 2.3°C | 75 mm | 73% | 3.7 m/s | 4 |
| 1984 | 19.5°C | 15.6°C | 11.8°C | 28.6°C | 1.8°C | 42 mm | 70% | 3.9 m/s | 4.1 |
| 1983 | 18.4°C | 14.8°C | 11.2°C | 25.2°C | 5.1°C | 80 mm | 76% | 3.5 m/s | — |
| 1982 | 16.7°C | 13.1°C | 9.5°C | 26.8°C | 0.2°C | 22 mm | 65% | 4 m/s | — |
| 1981 | 22.2°C | 17.7°C | 13.2°C | 30.3°C | 2.6°C | 27 mm | 61% | 3.7 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 18.3°C with lows near 10.9°C (mean 14.6°C), based on 45 years of NASA POWER data.
August averages 52 mm of rainfall in Yellowknife, a relatively wet time of year. The wettest on record was 109 mm in 2001.
The hottest August reached 30.6°C in 1989. The coldest dipped to 0.2°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.8°C. Daytime highs moved from 18.4°C to 19.3°C and overnight lows from 10.7°C to 11.5°C over the same span.
August is one of the warmer months of the year in Yellowknife and a relatively wet time of year, so plan for around 18.3°C daytime highs and 10.9°C at night.
Not quite — August is the 11th coolest month in Yellowknife, averaging 14.6°C.
For August in Yellowknife, pack light layers you can adjust through the day, with typical highs of 18.3°C and lows of 10.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 69% — moderately humid.
Average wind speed in August is 3.9 m/s. The windiest August on record averaged 4.5 m/s (2020).
The wettest August on record was 2001 with 109 mm. On average, August sees 52 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 Yellowknife 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.
