Pasadena weather in August: Pasadena, California: normal highs, lows, rain and records for August
Pasadena in August has a normal high of 91°F and a normal low of 63°F, a daily mean of 77°F, rising from 90°F on the 1st to 92°F by the 31st. Measurable precipitation falls on 0 days in a normal August, 0.03 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 17°C, 1 mm of precipitation in August.
- NOAA stationPasadena
- Station IDUSC00046719
- Location34.15°N 118.14°W
- Elevation864 ft (263 m)
- From the centerunder 1 mile
- Population137,195
- Jan 68° 46°
- Feb 69° 46°
- Mar 73° 48°
- Apr 76° 51°
- May 78° 54°
- Jun 84° 58°
- Jul 89° 62°
- Aug 91° 63°
- Sep 90° 62°
- Oct 83° 56°
- Nov 75° 50°
- Dec 67° 45°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pasadena in August?
The normal high is 91°F and the normal low 63°F, for a daily mean of 77.2°F. August is 1.6°F warmer than July and 1.4°F warmer than September. August is the warmest month of the year in Pasadena and the 12th wettest. Across the month the normal high rises 2°F, from 90°F on August 1 to 92°F on August 31. From one year to the next August's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 75°F and 79°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 2%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 90°F | 63°F | 2% | 0% |
| August 8 | 91°F | 63°F | 1% | 0% |
| August 15 | 91°F | 63°F | 1% | 0% |
| August 22 | 92°F | 63°F | 1% | 0% |
| August 31 | 92°F | 63°F | 2% | 0% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 27, coldest night August 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 90°F | 63°F | 2% | 0% | 13 h 50 min |
| August 2 | 90°F | 63°F | 1% | 0% | 13 h 50 min |
| August 3 | 90°F | 63°F | 1% | 0% | 13 h 50 min |
| August 4 | 90°F | 63°F | 1% | 0% | 13 h 50 min |
| August 5 | 90°F | 63°F | 1% | 0% | 13 h 50 min |
| August 6 | 91°F | 63°F | 1% | 0% | 13 h 40 min |
| August 7 | 91°F | 63°F | 1% | 0% | 13 h 40 min |
| August 8 | 91°F | 63°F | 1% | 0% | 13 h 40 min |
| August 9 | 91°F | 63°F | 1% | 0% | 13 h 40 min |
| August 10 | 91°F | 63°F | 1% | 0% | 13 h 40 min |
| August 11 | 91°F | 63°F | 1% | 0% | 13 h 40 min |
| August 12 | 91°F | 63°F | 1% | 0% | 13 h 30 min |
| August 13 | 91°F | 63°F | 1% | 0% | 13 h 30 min |
| August 14 | 91°F | 63°F | 1% | 0% | 13 h 30 min |
| August 15 | 91°F | 63°F | 1% | 0% | 13 h 30 min |
| August 16 | 91°F | 63°F | 1% | 0% | 13 h 30 min |
| August 17 | 92°F | 63°F | 1% | 0% | 13 h 20 min |
| August 18 | 92°F | 63°F | 1% | 0% | 13 h 20 min |
| August 19 | 92°F | 63°F | 1% | 0% | 13 h 20 min |
| August 20 | 92°F | 63°F | 1% | 0% | 13 h 20 min |
| August 21 | 92°F | 63°F | 1% | 0% | 13 h 20 min |
| August 22 | 92°F | 63°F | 1% | 0% | 13 h 10 min |
| August 23 | 92°F | 63°F | 1% | 0% | 13 h 10 min |
| August 24 | 92°F | 63°F | 1% | 0% | 13 h 10 min |
| August 25 | 92°F | 63°F | 1% | 0% | 13 h 10 min |
| August 26 | 92°F | 63°F | 1% | 0% | 13 h 10 min |
| August 27 | 92°F | 63°F | 1% | 0% | 13 h 10 min |
| August 28 | 92°F | 63°F | 1% | 0% | 13 h |
| August 29 | 92°F | 63°F | 1% | 0% | 13 h |
| August 30 | 92°F | 63°F | 1% | 0% | 13 h |
| August 31 | 92°F | 63°F | 2% | 0% | 13 h |
- Normal high
- 91°FAugust average
- Normal low
- 63°FAugust average
- Precipitation
- 0.03 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 19
- Daylight
- 13 h 50 min to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 31
- Sunshine
- 97%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00046719; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pasadena in August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 1 (2%). In all, 0.03 in falls on 0 days of a normal August.
In a normal August in Pasadena, 19 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00046719.
What are the records for August in Pasadena?
The warmest August temperature on this station's record (since 1893) is 109°F, on August 19, 2020; the coldest is 43°F, on August 28, 1912. The wettest August brought 4.61 in (2023).
The August mean against the 1991-2020 normal of 77.2°F: 2021 79.8°F (+2.6), 2022 82.7°F (+5.5), 2023 79.6°F (+2.4), 2024 80.0°F (+2.8), 2025 80.5°F (+3.3), 2026 82.7°F (+5.5). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.8°F | +2.6°F | 0.00 in |
| 2022 | 82.7°F | +5.5°F | 0.00 in |
| 2023 | 79.6°F | +2.4°F | 4.61 in |
| 2024 | 80.0°F | +2.8°F | 0.00 in |
| 2025 | 80.5°F | +3.3°F | 0.00 in |
| 2026 | 82.7°F | +5.5°F | 0.00 in |
Source: records: ACIS, station USC00046719; recent months: ACIS, station USC00046719. Records and recent months use complete months only.
How does August in Pasadena 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; Pasadena's is 91°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.