Yosemite Valley, CA weather in August
Expect hot, dry weather in Yosemite Valley in August, with highs near 89°F and lows near 57°F. Rain falls on about 1 day. It is one of the warmest months in Yosemite Valley.
- Normal high
- 89°F
- Normal low
- 57°F
- Wet days
- 1
- 0.2 in total
- Daylight
- 13.6 h
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 90°F | 87°F |
| Normal low | 58°F | 55°F |
| Chance of a wet day | 4% | 4% |
| Sunrise / sunset | 6:02 am / 8:07 pm | 6:27 am / 7:29 pm |
| Daylight | 14.1 h | 13.0 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)2 of 31
- Hot dayshigh 90°F or more17 of 31
- Wet daysat least 0.01 in of rain or melted snow1 of 31
- Notable rainat least 0.10 in0 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 0.2 in; a dry August brings about 0.0 in and a wet one about 0.08 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20202012: average high 93°F
- Coolest August2010: average high 85°F
- Wettest August2017: 2.3 in
- Driest August1991: no measurable precipitation
- Highest reading104°F (August 18, 2001)
- Lowest reading44°F (August 26, 2018)
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 | 89°F | 83°F |
| Normal low | 57°F | 57°F | 51°F |
| Wet days | 1 | 1 | 2 |
| Comfortable days | 2 | 2 | 8 |
| Daylight | 14.5 h | 13.6 h | 12.4 h |
Highs change by 0°F from July and -6°F into September.
Nearby alternatives in August
- Warmer: Fresno, CA70 mi · high 97°F · 0 wet days
- Cooler: Mammoth Lakes, CA34 mi · high 77°F · 2 wet days
How Yosemite Valley ranks in August
- Normal high148th warmest of 378 cities; 29th of 60 in California
- Wet days54th driest of 378
What to pack for Yosemite Valley in August
- Light, breathable clothing – highs near 89°F
- Layers – afternoons near 89°F but nights near 57°F
Heating and cooling
August has 4 heating degree days and 248 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Yosemite Valley in August?
The normal high is 89°F and the normal low is 57°F. From 1991 to 2020 the hottest August reading was 104°F (August 18, 2001).
Does it rain a lot in Yosemite Valley in August?
About 1 days in August have at least 0.01 in of precipitation, and the normal total is 0.2 in. The wettest August in 1991-2020 was in 2017 (2.3 in); the driest was in 1991, with no measurable precipitation.
Is August a good time to visit Yosemite Valley?
August ranks 9th of 12 months on our comfort score for Yosemite Valley (47 out of 100). It has about 2 comfortable days (judged by temperature only) and about 17 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain and frost dates: Yosemite Park Hq (USC00049855), 0.8 mi NW of the city center, 4,018 ft (52 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Hetch Hetchy (USC00043939), 19 mi NW of the city center, 3,870 ft (96 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: humidity and wind by hour, cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).