Ketchikan weather in August: Ketchikan, Alaska: normal highs, lows, rain and records for August
Ketchikan in August has a normal high of 65°F and a normal low of 53°F, a daily mean of 59°F, falling from 66°F on the 1st to 62°F by the 31st. Measurable precipitation falls on 17 days in a normal August, 11.30 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 18°C and low of 12°C, 287 mm of precipitation in August.
- NOAA stationKetchikan International Airport
- Station IDUSW00025325
- Location55.36°N 131.71°W
- Elevation76 ft (23 m)
- Population8,033
- Jan 40° 32°
- Feb 41° 32°
- Mar 44° 32°
- Apr 50° 37°
- May 57° 43°
- Jun 61° 49°
- Jul 65° 53°
- Aug 65° 53°
- Sep 59° 48°
- Oct 51° 41°
- Nov 44° 36°
- Dec 40° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Ketchikan in August?
The normal high is 65°F and the normal low 53°F, for a daily mean of 59.0°F. August is 0.2°F warmer than July and 5.4°F warmer than September. August is the warmest month of the year in Ketchikan and the 7th wettest. Across the month the normal high falls 4°F, from 66°F on August 1 to 62°F on August 31. From one year to the next August's mean temperature typically moves about 1.7°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 57°F and 61°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 62%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 66°F | 54°F | 49% | 34% |
| August 8 | 66°F | 54°F | 51% | 36% |
| August 15 | 65°F | 54°F | 54% | 40% |
| August 22 | 64°F | 53°F | 58% | 44% |
| August 31 | 62°F | 51°F | 62% | 48% |
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 | 66°F | 54°F | 49% | 34% | 16 h |
| August 2 | 66°F | 54°F | 50% | 34% | 16 h |
| August 3 | 66°F | 54°F | 50% | 35% | 15 h 50 min |
| August 4 | 66°F | 54°F | 50% | 35% | 15 h 50 min |
| August 5 | 66°F | 54°F | 50% | 35% | 15 h 50 min |
| August 6 | 66°F | 54°F | 50% | 36% | 15 h 40 min |
| August 7 | 66°F | 54°F | 51% | 36% | 15 h 40 min |
| August 8 | 66°F | 54°F | 51% | 36% | 15 h 30 min |
| August 9 | 66°F | 54°F | 51% | 37% | 15 h 30 min |
| August 10 | 66°F | 54°F | 52% | 37% | 15 h 30 min |
| August 11 | 66°F | 54°F | 52% | 38% | 15 h 20 min |
| August 12 | 66°F | 54°F | 53% | 38% | 15 h 20 min |
| August 13 | 65°F | 54°F | 53% | 39% | 15 h 10 min |
| August 14 | 65°F | 54°F | 54% | 39% | 15 h 10 min |
| August 15 | 65°F | 54°F | 54% | 40% | 15 h 10 min |
| August 16 | 65°F | 54°F | 55% | 40% | 15 h |
| August 17 | 65°F | 53°F | 55% | 41% | 15 h |
| August 18 | 65°F | 53°F | 56% | 41% | 14 h 50 min |
| August 19 | 65°F | 53°F | 56% | 42% | 14 h 50 min |
| August 20 | 64°F | 53°F | 57% | 43% | 14 h 50 min |
| August 21 | 64°F | 53°F | 57% | 43% | 14 h 40 min |
| August 22 | 64°F | 53°F | 58% | 44% | 14 h 40 min |
| August 23 | 64°F | 53°F | 58% | 44% | 14 h 30 min |
| August 24 | 64°F | 52°F | 59% | 45% | 14 h 30 min |
| August 25 | 64°F | 52°F | 59% | 45% | 14 h 20 min |
| August 26 | 63°F | 52°F | 60% | 46% | 14 h 20 min |
| August 27 | 63°F | 52°F | 60% | 46% | 14 h 10 min |
| August 28 | 63°F | 52°F | 61% | 47% | 14 h 10 min |
| August 29 | 63°F | 52°F | 61% | 47% | 14 h 10 min |
| August 30 | 63°F | 51°F | 62% | 48% | 14 h |
| August 31 | 62°F | 51°F | 62% | 48% | 14 h |
- Normal high
- 65°FAugust average
- Normal low
- 53°FAugust average
- Precipitation
- 11.30 inmonth total
- Days with precipitation
- 170.01 inch or more
- Daylight
- 16 h to 14 hAugust 1 to August 31
- Days at 70°F or more
- 6
- Sunshine
- 57%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00025325; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Ketchikan in August?
On a given August day the chance of 0.01 inch or more is 55% on average, highest around August 31 (62%). In all, 11.30 in falls on 17 days of a normal August, 4 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00025325.
How humid and windy is Ketchikan in August?
At 3 p.m. the normal temperature is 60°F with 75% relative humidity and a dew point of 52°F; at 6 a.m. it is 53°F with 93% humidity. The wind averages 7.4 mph, most often from the southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 53°F | 51°F | 93% | 6.0 mph | – |
| 9 a.m. | 57°F | 52°F | 84% | 8.8 mph | – |
| noon | 59°F | 52°F | 78% | 9.7 mph | – |
| 3 p.m. | 60°F | 52°F | 75% | 9.5 mph | – |
| 6 p.m. | 57°F | 52°F | 84% | 7.3 mph | – |
| 9 p.m. | 55°F | 52°F | 90% | 6.2 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00025325. 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 Ketchikan?
The warmest August temperature on this station's record (since 1910) is 89°F, on August 18, 1977; the coldest is 34°F, on August 31, 1913. The wettest August brought 33.90 in (1920).
The August mean against the 1991-2020 normal of 59.0°F: 2021 58.6°F (−0.4), 2022 61.7°F (+2.7), 2023 61.4°F (+2.4), 2024 62.0°F (+3.0), 2026 60.6°F (+1.6). 4 of 5 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 58.6°F | −0.4°F | 13.76 in |
| 2022 | 61.7°F | +2.7°F | 7.99 in |
| 2023 | 61.4°F | +2.4°F | 7.12 in |
| 2024 | 62.0°F | +3.0°F | 5.76 in |
| 2026 | 60.6°F | +1.6°F | 4.15 in |
Source: records: ACIS, station USW00025325; recent months: ACIS, station USW00025325. Records and recent months use complete months only.
How does August in Ketchikan 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; Ketchikan's is 65°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.