Alta weather in August

August in Alta: nice, rainy, with clean air — one of the weakest months to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Alta🇺🇸 United States · Rockies · Ski12
  1. 89Jan
  2. 86Feb
  3. 94Mar
  4. 79Apr
  5. 64May
  6. 26Jun
  7. 14Jul
  8. 12Aug
  9. 22Sep
  10. 69Oct
  11. 82Nov
  12. 91Dec

#12 of 12 months in Alta · #1397 of 1413 destinations to visit in August · comfort 12/100 (tier F)

Days
21°C
Nights
12°C
Wet days
13
Sun
12.4 h
Humidity
59%
Daylight
14 h
Alta, United States
Photo: Scott Catron from Sandy, Utah, USA · CC BY-SA 2.0

Traveller notes on Alta in August

Notes from nearby Park City (13 km away)

Alta doesn't have its own notes for August yet — these are about Park City, close enough to share the season.

Forum posters describe August daytime temperatures typically in the mid-70s to low-80sF, cooling into the 40s-60sF at night - genuinely comfortable, and consistently 10-15 degrees cooler than nearby Salt Lake City or Ogden at the same time. On air conditioning, opinions are mixed: several long-time residents say fans and evening breezes are enough most of the time thanks to the dry western climate (unlike Florida-style humidity), though posters acknowledge recent summers have brought the occasional genuine heat wave where AC is welcome - newer rental properties generally have it as standard. August also lines up with the Main Street Arts Festival and outdoor Utah Symphony concerts at Deer Valley, giving the pleasant weather a cultural draw alongside the usual outdoor activities.
Tripadvisor community · August · 5 days ago · about Park City · Read more on Tripadvisor ↗

Other months in Alta

Alta-forum threads on a September visit describe lift-served hiking access to Albion Basin as genuinely ending right around the start of the month, posters naming a season that typically runs from late June through the first few days of September. Regulars call Cecret Lake, Red and White Pine, Catherine's Pass and Grizzly Gulch real standard trails around Alta, several posters naming these the go-to routes in Little Cottonwood Canyon. Posters call fall color genuinely starting the last week of September into early October, several regulars naming this a reason to time a trip toward the later part of the month. Regulars call September mornings genuinely cool even with warm afternoons, several threads recommending layers for early hikes. Posters recommend checking lift and parking access before planning around Albion Basin, several regulars calling this standard given how the cutoff shifts year to year. The record: 17C days, 7.8C nights, 96.7mm across 12 days and 52 percent humidity.
AltaSeptemberRegular · September · 2 days ago · Read more on Tripadvisor ↗
Alta-forum threads on a November visit describe opening day as genuinely conditions-dependent, posters naming a typical window around November eighteenth to twenty-first though timing shifts with how much snow has fallen by then. Regulars call Alta's higher elevation and heavier natural snowfall a real advantage, several posters naming this why early-season conditions here hold up better than at nearby Utah resorts. Posters call a confirmed opening date genuinely unreliable to plan around, several regulars recommending flexible travel dates for a November trip. Regulars call early-season terrain considerably more limited than full winter, several threads warning only some runs are typically open right after opening day. Posters recommend checking daily snow reports before finalizing plans, several regulars calling this standard given how much conditions shift early in the season. The record: 1.4C days, -6.3C nights, 73mm across nearly 9 days and 66 percent humidity.
AltaNovemberRegular · November · 2 days ago · Read more on Tripadvisor ↗
Alta-forum threads on a July visit describe Albion Basin as genuinely at peak wildflower bloom, posters naming the seasonal gate opening July first as the real signal hiking there is finally possible. Regulars call the Cecret Lake trail a real standard pick, several posters naming it an easy, family-friendly way to reach the wildflower meadows. Posters call parking genuinely limited once the gate opens, several regulars recommending an early start or the shuttle to avoid a long wait at the trailhead. Regulars call July mornings comfortably cool before afternoon warmth sets in, several threads naming this the real window for a comfortable hike. Posters recommend checking bloom reports before a July trip, several regulars calling timing genuinely variable year to year depending on the past winter's runoff. The record: 22.8C days, 13.4C nights, 86.4mm across nearly 14 days and 44 percent humidity.
AltaJulyRegular · July · 3 days ago · Read more on Tripadvisor ↗
Alta-forum threads on an October visit describe this as genuinely off-season for skiing, posters calling the resort typically not opening lifts until around November eighteenth, conditions permitting, well after most October trips. Regulars call fall colors a real reason to visit anyway, several posters naming late September into early October a beautiful, genuinely lonely window for canyon scenery. Posters call weather risk genuinely rising as October goes on, several regulars warning an early system is possible even before the resort itself is ready to open. Regulars call this a real quiet stretch between summer hiking season and the winter rush, several threads describing October as neither one thing nor the other. Posters recommend treating an October trip as a scenery visit rather than a ski trip, several regulars calling this the honest expectation. The record: 7.7C days, -0.8C nights, an extraordinarily high 75.3mm across over 8 days and 58 percent humidity.
AltaOctoberRegular · October · 3 days ago · Read more on Tripadvisor ↗

Add your own note from Alta's card on the map.

Alta climate normals — August

Daytime high21°C / 70°F😎 nice
Nighttime low12°C / 54°F
Rainfall121 mm / 4.7 in🌧 rainy
Rainy days13 days
Humidity59%🍃 comfortable
Dew point7°C / 45°F
Sunshine12.4 h/day
Daylight13.7 h
Wind13 km/h / 8 mph
Air quality (US AQI)47🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Alta in August

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

BusySummer break in United States, school holidays in 2 of the markets that fill it(estimated)

JFMAMJJASOND

Peak crowdsBusyShoulder seasonQuiet

Best months for Alta's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Toughest weatherAlta's best weather comes in January, March and December — separate windows, not one continuous season.

JFMAMJJASOND

Best weatherFair weatherToughest weather

Nearby, and something's on

Within 300 km of Alta — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Alta?

Loading map…

Alta in August — FAQ

Is August a good time to visit Alta?
August in Alta: nice, rainy, with clean air — one of the weakest months to visit. It ranks #12 of 12 months for Alta on SeasonMap's comfort score (12/100).
What is the weather like in Alta in August?
In August, Alta averages a daily high of 21.3°C and a low of 12.4°C, with about 120.6 mm of rain over roughly 12.6 rainy days.
What is the air quality in Alta in August?
Alta has a mean US Air Quality Index of about 47 in August.

Within 300 km: Park City's Alpine wildflowers around 1 Jul – 15 Aug, and Arches National Park's Full car park road closures on 1 May – 31 Oct.