Pasadena, CA weather in August
In August, Pasadena sees highs around 91°F and lows around 63°F: hot and dry. Rain is rare. It is one of the warmest months in Pasadena.
- Normal high
- 91°F
- Normal low
- 63°F
- Wet days
- 0
- 0.03 in total
- Muggy days
- 1
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 90°F | 92°F |
| Normal low | 63°F | 63°F |
| Chance of a wet day | 1% | 1% |
| Sunrise / sunset | 6:03 am / 7:54 pm | 6:25 am / 7:20 pm |
| Daylight | 13.8 h | 12.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical August day
- 6 am66°Fdew point 57°F
- 9 am76°Fdew point 58°F
- Noon86°Fdew point 58°F
- 3 pm87°Fdew point 56°F
- 6 pm81°Fdew point 57°F
- 9 pm72°Fdew point 59°F
NOAA hourly normals (local standard time) from Burbank Glendale Pasadena Airport (13 mi away); average wind 6 mph; clear or few clouds in 94% of daytime hours, mostly cloudy or overcast in 5%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Hot dayshigh 90°F or more19 of 31
- Muggy daysdaily mean dew point 65°F or more1 of 31
- Wet daysat least 0.01 in of rain or melted snow0 of 31
- Notable rainat least 0.10 in0 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 0.03 in; a dry August brings about 0.0 in and a wet one about 0.02 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20201998: average high 97°F
- Coolest August2002: average high 87°F
- Wettest August1998: 0.5 in
- Driest August1992: no measurable precipitation
- Highest reading109°F (August 19, 2020)
- Lowest reading53°F (August 18, 1995)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 89°F | 91°F | 90°F |
| Normal low | 62°F | 63°F | 62°F |
| Wet days | 1 | 0 | 1 |
| Comfortable days | 1 | 0 | 3 |
| Daylight | 14.2 h | 13.4 h | 12.4 h |
Highs change by +2°F from July and -1°F into September.
Nearby alternatives in August
- Warmer: Santa Clarita, CA28 mi · high 97°F · 0 wet days
- Cooler: Los Angeles, CA9 mi · high 84°F · 0 wet days
How Pasadena ranks in August
- Normal high104th warmest of 378 cities; 25th of 60 in California
- Wet days41st driest of 378
- Comfortable days214th most of 341
What to pack for Pasadena in August
- Light, breathable clothing – highs near 91°F
- Layers – afternoons near 91°F but nights near 63°F
Heating and cooling
August has 0 heating degree days and 380 cooling degree days (base 65°F), 13% of the year's total heating and cooling demand.
Questions
How hot is Pasadena in August?
The normal high is 91°F and the normal low is 63°F. From 1991 to 2020 the hottest August reading was 109°F (most recently on August 19, 2020).
Does it rain a lot in Pasadena in August?
About 0 days in August have at least 0.01 in of precipitation, and the normal total is 0.03 in. The wettest August in 1991-2020 was in 1998 (0.5 in); the driest was in 1992, with no measurable precipitation.
Is August a good time to visit Pasadena?
August ranks 12th of 12 months on our comfort score for Pasadena (44 out of 100). It has almost no comfortable days and about 19 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain and frost dates: Pasadena (USC00046719), 0.0 mi NNW of the city center, 864 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: U C L A (USC00049152), 18 mi WSW of the city center, 430 ft (433 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Burbank Glendale Pasadena Airport (USW00023152), 13 mi WNW of the city center, 741 ft (122 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Burbank-Glendale-Pasa Arpt (722880-23152), 13 mi WNW of the city center, 731 ft (132 ft lower than the city). Hourly observations, 1991-2020.