Juneau weather in August: Juneau, Alaska: normal highs, lows, rain and records for August
Juneau in August has a normal high of 63°F and a normal low of 49°F, a daily mean of 56°F, falling from 65°F on the 1st to 60°F by the 31st. Measurable precipitation falls on 19 days in a normal August, 6.41 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 17°C and low of 10°C, 163 mm of precipitation in August.
- NOAA stationJuneau Airport
- Station IDUSW00025309
- Location58.36°N 134.56°W
- Elevation16 ft (5 m)
- Population31,572
- Jan 33° 24°
- Feb 36° 25°
- Mar 39° 27°
- Apr 49° 33°
- May 58° 40°
- Jun 62° 47°
- Jul 64° 50°
- Aug 63° 49°
- Sep 56° 44°
- Oct 47° 37°
- Nov 38° 29°
- Dec 35° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Juneau in August?
The normal high is 63°F and the normal low 49°F, for a daily mean of 56.0°F. August is 1.0°F cooler than July and 5.9°F warmer than September. August is the 2nd warmest month of the year in Juneau and the 5th wettest. Across the month the normal high falls 5°F, from 65°F on August 1 to 60°F on August 31. From one year to the next August's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 54°F and 58°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 71%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 65°F | 51°F | 59% | 40% |
| August 8 | 64°F | 50°F | 60% | 42% |
| August 15 | 63°F | 50°F | 63% | 45% |
| August 22 | 62°F | 48°F | 67% | 48% |
| August 31 | 60°F | 47°F | 71% | 52% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 65°F | 51°F | 59% | 40% | 16 h 30 min |
| August 2 | 65°F | 51°F | 59% | 40% | 16 h 30 min |
| August 3 | 65°F | 51°F | 59% | 40% | 16 h 30 min |
| August 4 | 65°F | 51°F | 59% | 40% | 16 h 20 min |
| August 5 | 65°F | 51°F | 59% | 41% | 16 h 20 min |
| August 6 | 65°F | 51°F | 60% | 41% | 16 h 10 min |
| August 7 | 64°F | 50°F | 60% | 41% | 16 h 10 min |
| August 8 | 64°F | 50°F | 60% | 42% | 16 h |
| August 9 | 64°F | 50°F | 60% | 42% | 16 h |
| August 10 | 64°F | 50°F | 61% | 42% | 15 h 50 min |
| August 11 | 64°F | 50°F | 61% | 43% | 15 h 50 min |
| August 12 | 64°F | 50°F | 62% | 43% | 15 h 40 min |
| August 13 | 64°F | 50°F | 62% | 44% | 15 h 40 min |
| August 14 | 64°F | 50°F | 63% | 44% | 15 h 30 min |
| August 15 | 63°F | 50°F | 63% | 45% | 15 h 30 min |
| August 16 | 63°F | 49°F | 64% | 45% | 15 h 30 min |
| August 17 | 63°F | 49°F | 64% | 46% | 15 h 20 min |
| August 18 | 63°F | 49°F | 65% | 46% | 15 h 20 min |
| August 19 | 63°F | 49°F | 65% | 46% | 15 h 10 min |
| August 20 | 63°F | 49°F | 66% | 47% | 15 h 10 min |
| August 21 | 62°F | 49°F | 66% | 47% | 15 h |
| August 22 | 62°F | 48°F | 67% | 48% | 15 h |
| August 23 | 62°F | 48°F | 67% | 48% | 14 h 50 min |
| August 24 | 62°F | 48°F | 68% | 49% | 14 h 50 min |
| August 25 | 61°F | 48°F | 68% | 49% | 14 h 40 min |
| August 26 | 61°F | 48°F | 69% | 50% | 14 h 40 min |
| August 27 | 61°F | 47°F | 69% | 50% | 14 h 30 min |
| August 28 | 61°F | 47°F | 70% | 51% | 14 h 30 min |
| August 29 | 60°F | 47°F | 70% | 51% | 14 h 20 min |
| August 30 | 60°F | 47°F | 70% | 51% | 14 h 20 min |
| August 31 | 60°F | 47°F | 71% | 52% | 14 h 10 min |
- Normal high
- 63°FAugust average
- Normal low
- 49°FAugust average
- Precipitation
- 6.41 inmonth total
- Days with precipitation
- 190.01 inch or more
- Daylight
- 16 h 30 min to 14 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 6
- Days at 80°F or more
- 1
- Sunshine
- 56%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00025309; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Juneau in August?
On a given August day the chance of 0.01 inch or more is 64% on average, highest around August 31 (71%). In all, 6.41 in falls on 19 days of a normal August, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00025309.
How humid and windy is Juneau in August?
At 3 p.m. the normal temperature is 58°F with 76% relative humidity and a dew point of 50°F; at 6 a.m. it is 49°F with 95% humidity. The wind averages 7.1 mph, most often from the east-southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 48°F | 95% | 5.8 mph | – |
| 9 a.m. | 54°F | 50°F | 88% | 7.2 mph | 7% |
| noon | 57°F | 50°F | 79% | 9.6 mph | – |
| 3 p.m. | 58°F | 50°F | 76% | 9.3 mph | 5% |
| 6 p.m. | 55°F | 50°F | 82% | 7.5 mph | – |
| 9 p.m. | 52°F | 49°F | 91% | 5.9 mph | 11% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00025309. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Juneau?
The warmest August temperature on Juneau's official record (since 1943) is 85°F, on August 14, 2026; the coldest is 27°F, on August 25, 1948. The wettest August brought 12.31 in (1961).
The August mean against the 1991-2020 normal of 56.0°F: 2021 57.0°F (+1.0), 2022 58.1°F (+2.1), 2023 58.6°F (+2.6), 2024 56.9°F (+0.9), 2026 58.5°F (+2.5). 5 of 5 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 57.0°F | +1.0°F | 8.62 in |
| 2022 | 58.1°F | +2.1°F | 9.05 in |
| 2023 | 58.6°F | +2.6°F | 5.47 in |
| 2024 | 56.9°F | +0.9°F | 4.64 in |
| 2026 | 58.5°F | +2.5°F | 4.79 in |
Source: records: ACIS, NWS threaded record JNUthr; recent months: ACIS, station USW00025309. Records and recent months use complete months only.
How does August in Juneau compare across Alaska?
Across the 85 places PlainClimate covers in Alaska, August normal highs run from 45°F in Utqiaġvik to 68°F in Two Rivers; Juneau's is 63°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.