Arcata weather in August: Arcata, California: normal highs, lows, rain and records for August
Arcata in August has a normal high of 65°F and a normal low of 51°F, a daily mean of 58°F, holding near 65°F all month. Measurable precipitation falls on 6 days in a normal August, 0.26 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 18°C and low of 11°C, 7 mm of precipitation in August.
- NOAA stationArcata Eureka Airport
- Station IDUSW00024283
- Location40.98°N 124.11°W
- Elevation200 ft (61 m)
- Population18,748
- Jan 56° 41°
- Feb 57° 41°
- Mar 57° 41°
- Apr 58° 43°
- May 60° 46°
- Jun 63° 49°
- Jul 63° 51°
- Aug 65° 51°
- Sep 65° 49°
- Oct 64° 45°
- Nov 59° 42°
- Dec 56° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Arcata in August?
The normal high is 65°F and the normal low 51°F, for a daily mean of 57.9°F. August is 0.5°F warmer than July and 1.1°F warmer than September. August is the warmest month of the year in Arcata and the 11th wettest. Across the month the normal high rises 1°F, from 64°F on August 1 to 65°F on August 31. From one year to the next August's mean temperature typically moves about 1.3°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 57°F and 59°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 22%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 64°F | 52°F | 18% | 1% |
| August 8 | 64°F | 52°F | 18% | 1% |
| August 15 | 65°F | 52°F | 19% | 1% |
| August 22 | 65°F | 51°F | 20% | 2% |
| August 31 | 65°F | 50°F | 22% | 3% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 30, coldest night August 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 64°F | 52°F | 18% | 1% | 14 h 20 min |
| August 2 | 64°F | 52°F | 18% | 1% | 14 h 20 min |
| August 3 | 64°F | 52°F | 18% | 1% | 14 h 20 min |
| August 4 | 64°F | 52°F | 18% | 1% | 14 h 20 min |
| August 5 | 64°F | 52°F | 18% | 1% | 14 h 10 min |
| August 6 | 64°F | 52°F | 18% | 1% | 14 h 10 min |
| August 7 | 64°F | 52°F | 18% | 1% | 14 h 10 min |
| August 8 | 64°F | 52°F | 18% | 1% | 14 h 10 min |
| August 9 | 64°F | 52°F | 18% | 1% | 14 h 10 min |
| August 10 | 64°F | 52°F | 18% | 1% | 14 h |
| August 11 | 64°F | 52°F | 18% | 1% | 14 h |
| August 12 | 64°F | 52°F | 18% | 1% | 14 h |
| August 13 | 64°F | 52°F | 18% | 1% | 14 h |
| August 14 | 65°F | 52°F | 19% | 1% | 13 h 50 min |
| August 15 | 65°F | 52°F | 19% | 1% | 13 h 50 min |
| August 16 | 65°F | 51°F | 19% | 1% | 13 h 50 min |
| August 17 | 65°F | 51°F | 19% | 1% | 13 h 50 min |
| August 18 | 65°F | 51°F | 19% | 1% | 13 h 40 min |
| August 19 | 65°F | 51°F | 19% | 2% | 13 h 40 min |
| August 20 | 65°F | 51°F | 19% | 2% | 13 h 40 min |
| August 21 | 65°F | 51°F | 20% | 2% | 13 h 40 min |
| August 22 | 65°F | 51°F | 20% | 2% | 13 h 30 min |
| August 23 | 65°F | 51°F | 20% | 2% | 13 h 30 min |
| August 24 | 65°F | 51°F | 20% | 2% | 13 h 30 min |
| August 25 | 65°F | 51°F | 20% | 2% | 13 h 30 min |
| August 26 | 65°F | 51°F | 21% | 2% | 13 h 20 min |
| August 27 | 65°F | 50°F | 21% | 2% | 13 h 20 min |
| August 28 | 65°F | 50°F | 21% | 2% | 13 h 20 min |
| August 29 | 65°F | 50°F | 22% | 3% | 13 h 20 min |
| August 30 | 65°F | 50°F | 22% | 3% | 13 h 10 min |
| August 31 | 65°F | 50°F | 22% | 3% | 13 h 10 min |
- Normal high
- 65°FAugust average
- Normal low
- 51°FAugust average
- Precipitation
- 0.26 inmonth total
- Days with precipitation
- 60.01 inch or more
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 3
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024283; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Arcata in August?
On a given August day the chance of 0.01 inch or more is 19% on average, highest around August 31 (22%). In all, 0.26 in falls on 6 days of a normal August.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024283.
How humid and windy is Arcata in August?
At 3 p.m. the normal temperature is 63°F with 73% relative humidity and a dew point of 54°F; at 6 a.m. it is 52°F with 96% humidity. The wind averages 5.1 mph, most often from the northwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 52°F | 51°F | 96% | 2.1 mph | – |
| 9 a.m. | 58°F | 54°F | 86% | 4.3 mph | – |
| noon | 62°F | 54°F | 76% | 8.3 mph | – |
| 3 p.m. | 63°F | 54°F | 73% | 9.9 mph | 68% |
| 6 p.m. | 60°F | 54°F | 81% | 7.3 mph | 65% |
| 9 p.m. | 55°F | 53°F | 92% | 3.4 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024283. 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 Arcata?
The warmest August temperature on this station's record (since 1945) is 81°F, on August 15, 2020; the coldest is 38°F, on August 26, 1995. The wettest August brought 1.58 in (2024).
The August mean against the 1991-2020 normal of 57.9°F: 2021 57.2°F (−0.7), 2022 59.4°F (+1.5), 2023 61.6°F (+3.7), 2024 58.3°F (+0.4), 2025 58.1°F (+0.2), 2026 58.2°F (+0.3). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 57.2°F | −0.7°F | 0.01 in |
| 2022 | 59.4°F | +1.5°F | 0.00 in |
| 2023 | 61.6°F | +3.7°F | 0.07 in |
| 2024 | 58.3°F | +0.4°F | 1.58 in |
| 2025 | 58.1°F | +0.2°F | 0.06 in |
| 2026 | 58.2°F | +0.3°F | 0.03 in |
Source: records: ACIS, station USW00024283; recent months: ACIS, station USW00024283. Records and recent months use complete months only.
How does August in Arcata compare across California?
Across the 219 places PlainClimate covers in California, August normal highs run from 63°F in Bodega to 109°F in Needles; Arcata's is 65°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.