August is one of the warmer months of the year in Anchorage, with average highs near 16.1°C and lows around 8.4°C (mean 12.3°C). It is a relatively wet time of year, averaging 181 mm of rainfall and 80% relative humidity across the period.
August is one of the warmer months of the year in Anchorage. Across 45 years of records, the warmest August in Anchorage was 2004 — when the month averaged 16.3°C — while the coldest was 1998 at 9.8°C. Typical August days reach 16.1°C with nights near 8.4°C. The long-term trend is warming, about 0.3°C per decade.
August is a relatively wet time of year in Anchorage, averaging 181 mm of rainfall. The wettest August on record was 2022 with 387 mm, while the driest was 2004 at 25 mm.
Relative humidity in Anchorage during August averages 80%. The most humid August was 1992 at 86%, and the least humid was 2019 at 69%.
August receives about 3.7 kWh/m²/day of solar energy in Anchorage. The sunniest August was 2015 at 4.6 kWh/m²/day, and the cloudiest was 2022 at 2.9.
Average wind speed in Anchorage during August is 1.7 m/s. The windiest August was 1984 at 2.3 m/s, while the calmest were 2002 and 2014 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.5°C | 11.9°C | 12.9°C | 12.5°C | 12.5°C | +1°C |
| Avg High | 15.5°C | 15.8°C | 16.9°C | 16.1°C | 16.2°C | +0.7°C |
| Avg Low | 7.5°C | 8.0°C | 8.8°C | 8.8°C | 8.9°C | +1.4°C |
| Avg Rain | 172 mm | 169 mm | 154 mm | 202 mm | 227 mm | +56 mm |
August temperatures in Anchorage have risen by about 1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -0.8°C (1984) to a record high of 28.9°C (2004).
Rainfall in August is a relatively wet time of year, averaging 181 mm, with a wettest year of 387 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°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 Anchorage
August is one of the best times to visit Anchorage. Expect days averaging 16.1°C and nights around 8.4°C (mean 12.3°C) — warmer than Anchorage's yearly average — with higher rainfall (181 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 | 16.4°C | 12.6°C | 8.7°C | 20.4°C | 4.3°C | 180 mm | 80% | 2 m/s | 3.6 |
| 2024 | 14.9°C | 11.3°C | 7.7°C | 21.6°C | 4.4°C | 273 mm | 82% | 1.9 m/s | 3.3 |
| 2023 | 17.3°C | 13.9°C | 10.5°C | 25.1°C | 7.3°C | 240 mm | 82% | 1.6 m/s | 3.3 |
| 2022 🌧️ | 15.1°C | 11.9°C | 8.8°C | 22.6°C | 4.9°C | 387 mm | 85% | 1.7 m/s | 2.9 |
| 2021 | 16.5°C | 12.4°C | 8.4°C | 27.2°C | 1.8°C | 151 mm | 77% | 1.6 m/s | 3.9 |
| 2020 | 17.0°C | 13.1°C | 9.3°C | 21.9°C | 5.3°C | 132 mm | 80% | 1.8 m/s | 4.1 |
| 2019 | 20.2°C | 15.4°C | 10.5°C | 25.0°C | 4.7°C | 37 mm | 69% | 1.9 m/s | 4.5 |
| 2018 | 15.7°C | 12.1°C | 8.4°C | 21.7°C | 5.0°C | 223 mm | 81% | 1.8 m/s | 3.2 |
| 2017 | 14.9°C | 11.8°C | 8.8°C | 24.7°C | 5.7°C | 222 mm | 85% | 1.6 m/s | 3.3 |
| 2016 | 16.3°C | 13.2°C | 10.0°C | 20.1°C | 6.8°C | 306 mm | 85% | 1.8 m/s | 3.2 |
| 2015 | 17.0°C | 12.6°C | 8.2°C | 25.2°C | 1.8°C | 74 mm | 71% | 2.1 m/s | 4.6 |
| 2014 | 15.8°C | 12.4°C | 9.0°C | 19.7°C | 2.0°C | 220 mm | 82% | 1.3 m/s | 3.4 |
| 2013 | 15.5°C | 12.3°C | 9.0°C | 18.4°C | 4.9°C | 262 mm | 82% | 1.7 m/s | 3.3 |
| 2012 | 15.7°C | 11.7°C | 7.7°C | 21.3°C | 4.2°C | 201 mm | 80% | 1.8 m/s | 3.7 |
| 2011 | 14.6°C | 11.2°C | 7.7°C | 19.4°C | 4.8°C | 304 mm | 83% | 1.7 m/s | 3.5 |
| 2010 | 15.6°C | 12.1°C | 8.7°C | 19.4°C | 4.8°C | 168 mm | 82% | 1.7 m/s | 3.4 |
| 2009 | 16.1°C | 12.0°C | 7.8°C | 22.2°C | 3.3°C | 147 mm | 77% | 1.6 m/s | 3.9 |
| 2008 | 15.4°C | 11.7°C | 8.1°C | 18.7°C | 5.0°C | 59 mm | 79% | 1.4 m/s | 3.6 |
| 2007 | 17.5°C | 13.5°C | 9.4°C | 23.8°C | 6.7°C | 128 mm | 79% | 1.5 m/s | 3.9 |
| 2006 | 14.2°C | 11.1°C | 7.9°C | 20.7°C | 2.0°C | 335 mm | 83% | 1.7 m/s | 3.1 |
| 2005 | 18.4°C | 14.1°C | 9.9°C | 26.9°C | 4.6°C | 75 mm | 76% | 1.5 m/s | 4 |
| 2004 🔥 | 21.2°C | 16.3°C | 11.3°C | 28.9°C | 5.2°C | 25 mm | 71% | 1.4 m/s | 4.5 |
| 2003 | 16.5°C | 12.8°C | 9.2°C | 24.9°C | 5.9°C | 231 mm | 80% | 1.6 m/s | 3.7 |
| 2002 | 17.0°C | 13.1°C | 9.1°C | 26.1°C | 6.3°C | 192 mm | 77% | 1.3 m/s | 3.8 |
| 2001 | 16.6°C | 13.0°C | 9.4°C | 22.9°C | 6.4°C | 238 mm | 81% | 1.8 m/s | 3.5 |
| 2000 | 15.7°C | 11.1°C | 6.4°C | 22.5°C | 1.2°C | 110 mm | 74% | 1.9 m/s | 4.2 |
| 1999 | 15.4°C | 12.1°C | 8.7°C | 21.4°C | 6.2°C | 193 mm | 83% | 1.8 m/s | 3.8 |
| 1998 ❄️ | 13.5°C | 9.8°C | 6.2°C | 21.1°C | 1.4°C | 179 mm | 82% | 2.1 m/s | 3.4 |
| 1997 | 17.5°C | 13.4°C | 9.2°C | 23.2°C | 5.2°C | 168 mm | 78% | 1.9 m/s | 3.7 |
| 1996 | 15.4°C | 11.3°C | 7.2°C | 20.8°C | 2.0°C | 128 mm | 77% | 1.7 m/s | 3.6 |
| 1995 | 15.7°C | 12.0°C | 8.3°C | 19.5°C | 6.0°C | 147 mm | 79% | 1.9 m/s | 3.7 |
| 1994 | 17.9°C | 13.5°C | 9.1°C | 24.3°C | 1.1°C | 83 mm | 76% | 1.9 m/s | 3.9 |
| 1993 | 16.3°C | 12.4°C | 8.5°C | 23.4°C | 2.4°C | 250 mm | 82% | 1.9 m/s | 3.7 |
| 1992 | 13.7°C | 10.4°C | 7.1°C | 19.7°C | 3.9°C | 251 mm | 86% | 1.5 m/s | 3.4 |
| 1991 | 15.2°C | 11.1°C | 6.9°C | 19.5°C | 2.0°C | 154 mm | 79% | 1.9 m/s | 3.9 |
| 1990 | 17.6°C | 13.4°C | 9.2°C | 27.9°C | 4.4°C | 136 mm | 77% | 1.4 m/s | 3.5 |
| 1989 | 16.1°C | 12.6°C | 9.1°C | 23.9°C | 5.5°C | 308 mm | 85% | 1.8 m/s | 3.1 |
| 1988 | 15.0°C | 11.4°C | 7.7°C | 20.9°C | 4.1°C | 234 mm | 81% | 1.7 m/s | 3.6 |
| 1987 | 17.5°C | 12.9°C | 8.3°C | 24.8°C | -0.1°C | 79 mm | 73% | 1.9 m/s | 4.2 |
| 1986 | 13.4°C | 9.9°C | 6.3°C | 18.9°C | 2.6°C | 192 mm | 84% | 1.7 m/s | 3.6 |
| 1985 | 15.0°C | 11.1°C | 7.3°C | 21.6°C | 3.6°C | 168 mm | 79% | 1.8 m/s | 3.5 |
| 1984 | 15.6°C | 11.5°C | 7.3°C | 23.5°C | -0.8°C | 168 mm | 76% | 2.3 m/s | 4 |
| 1983 | 15.4°C | 11.2°C | 7.0°C | 23.4°C | 2.0°C | 145 mm | 77% | 1.9 m/s | — |
| 1982 | 16.3°C | 11.9°C | 7.4°C | 19.8°C | 4.3°C | 73 mm | 75% | 1.5 m/s | — |
| 1981 | 15.1°C | 11.2°C | 7.4°C | 22.9°C | 2.9°C | 180 mm | 83% | 1.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 16.1°C with lows near 8.4°C (mean 12.3°C), based on 45 years of NASA POWER data.
August averages 181 mm of rainfall in Anchorage, a relatively wet time of year. The wettest on record was 387 mm in 2022.
The hottest August reached 28.9°C in 2004. The coldest dipped to -0.8°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1°C. Daytime highs moved from 15.5°C to 16°C and overnight lows from 7.3°C to 8.8°C over the same span.
August is one of the warmer months of the year in Anchorage and a relatively wet time of year, so plan for around 16.1°C daytime highs and 8.4°C at night.
Not quite — August is the 11th coolest month in Anchorage, averaging 12.3°C.
For August in Anchorage, pack light layers you can adjust through the day, with typical highs of 16.1°C and lows of 8.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 80% — quite humid.
Average wind speed in August is 1.7 m/s. The windiest August on record averaged 2.3 m/s (1984).
The wettest August on record was 2022 with 387 mm. On average, August sees 181 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 Anchorage 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.
