Pomona, CA weather in August
Pomona is hot and dry in August: highs average 95°F and nights drop to about 65°F. Rain is rare. This is the peak of the warm season in Pomona. Midday heat is the main thing to plan around.
- Normal high
- 95°F
- Normal low
- 65°F
- Wet days
- 0
- 0.0 in total
- Daylight
- 13.4 h
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 95°F | 95°F |
| Normal low | 65°F | 65°F |
| Chance of a wet day | 1% | 1% |
| Sunrise / sunset | 6:02 am / 7:52 pm | 6:23 am / 7:18 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 (36 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 (temperature only: no humidity station nearby)1 of 31
- Hot dayshigh 90°F or more24 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 0.0 in; a dry August brings about 0.0 in and a wet one about 0.0 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20202020: average high 98°F
- Coolest August2002: average high 90°F
- Wettest August2014: 0.07 in
- Driest August1991: no measurable precipitation
- Highest reading112°F (August 31, 2017)
- Lowest reading56°F (August 8, 2011)
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 | 94°F | 95°F | 91°F |
| Normal low | 65°F | 65°F | 64°F |
| Wet days | 1 | 0 | 1 |
| Comfortable days | 1 | 1 | 4 |
| Daylight | 14.2 h | 13.4 h | 12.4 h |
Highs change by +1°F from July and -4°F into September.
Nearby alternatives in August
- Warmer: Palm Springs, CA71 mi · high 108°F · 1 wet day
- Cooler: West Covina, CA11 mi · high 84°F · 0 wet days
How Pomona ranks in August
- Normal high53rd warmest of 378 cities; 15th of 60 in California
- Wet days12th driest of 378
What to pack for Pomona in August
- Light, breathable clothing – highs near 95°F
- Layers – afternoons near 95°F but nights near 65°F
Heating and cooling
August has 0 heating degree days and 467 cooling degree days (base 65°F), 14% of the year's total heating and cooling demand.
Questions
How hot is Pomona in August?
The normal high is 95°F and the normal low is 65°F. From 1991 to 2020 the hottest August reading was 112°F (August 31, 2017).
Does it rain a lot in Pomona in August?
About 0 days in August have at least 0.01 in of precipitation, and the normal total is 0.00 in. The wettest August in 1991-2020 was in 2014 (0.07 in); the driest was in 1991, with no measurable precipitation.
Is August a good time to visit Pomona?
August ranks 12th of 12 months on our comfort score for Pomona (42 out of 100). It has about 1 comfortable day (judged by temperature only) and about 24 days at 90°F or hotter. The best months are March, April and May.
Where the numbers come from
- Temperature: Ontario Intl Airport (USW00003102), 8.7 mi E of the city center, 949 ft (100 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Rain: San Gabriel Canyon PH (USC00047776), 11 mi NW of the city center, 744 ft (105 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Covina City Yard Fc387b (USC00042090), 7.7 mi WNW of the city center, 607 ft (242 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Pomona/Fairplex (USC00047050), 2.0 mi NNW of the city center, 999 ft (150 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Burbank Glendale Pasadena Airport (USW00023152), 36 mi WNW of the city center, 741 ft (108 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: daily humidity and wind (no station close enough or similar enough in elevation).