Big Sky weather in July

July in Big Sky: warm, a little rain, with clean air — one of the weakest months to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Big Sky🇺🇸 United States · Rockies · Ski14
  1. 90Jan
  2. 94Feb
  3. 83Mar
  4. 77Apr
  5. 50May
  6. 20Jun
  7. 14Jul
  8. 12Aug
  9. 23Sep
  10. 59Oct
  11. 74Nov
  12. 87Dec

#11 of 12 months in Big Sky · #1353 of 1413 destinations to visit in July · comfort 14/100 (tier F)

Days
26°C
Nights
12°C
Wet days
10
Sun
13.7 h
Humidity
53%
Daylight
15 h
Big Sky, United States
Photo: Alex Moliski · Pexels

Traveller notes on Big Sky in July

Big Sky-forum threads on a July visit describe this as genuinely peak season, posters recommending the chairlift or gondola up the mountain for anyone wanting the views without a full hike. Regulars call Beehive Basin the standout hike close to town, Ousel Falls named the easier first outing for anyone easing into the altitude. Posters recommend a ranch experience or horseback outing as a genuine change of pace from the trail-heavy itinerary most visitors default to. Regulars call late July the calendar's busiest stretch, Music in the Meadows, the farmers market and the PBR Rodeo all real draws worth timing a trip around. Posters recommend real bear spray for hikes further from town like Upper Beehive, wildlife encounters here a genuine possibility. Regulars call the daytime warmth genuinely comfortable, evenings still cool enough for a real layer once the sun drops. The record: 25.7C days feeling like 25C, 12C nights, 38.4mm across over 10 days and 53 percent humidity.
BigSkyJulyRegular · July · 1 month ago · Read more on Tripadvisor ↗

Other months in Big Sky

Big Sky-forum threads on an April visit describe closing as genuinely landing around the tenth or eleventh of the month, posters naming this timing as often falling near Easter. Regulars call steady late-season snowfall genuinely still standard, several posters naming warmer, longer days alongside notably thinner crowds as real advantages of visiting this late. Posters call the resort genuinely feeling local by April, several regulars naming this a real contrast to the busier winter peak. Regulars call spring corn snow genuinely some of the best value and conditions of the entire season, several threads naming this a real reason not to overlook April. Posters recommend Closing Weekend specifically if timing allows, several regulars calling this a real notable on-mountain event worth planning a trip around. The record: 6.6C days, -3.3C nights, 79.9mm across nearly 15 days and 72 percent humidity.
BigSkyAprilRegular · April · 1 month ago · Read more on Tripadvisor ↗
Big Sky-forum threads on a late May visit describe this as shoulder season, posters using it as a base for Yellowstone while asking whether local businesses would be open given the timing. Regulars call biking, horseback riding and rafting on the Gallatin River all real May options once conditions allow, several posters recommending these over anything snow-dependent this late in spring. Posters recommend checking the Big Sky and Bozeman Chamber event calendars directly, several regulars calling this the best way to confirm what's actually running during shoulder weeks. Regulars call lodging genuinely varied this time of year, ski-in options and condo complexes both mentioned as available even outside peak season. Posters recommend real flexibility around exact May plans, some businesses here still on reduced or seasonal schedules this early. The record: 11.8C days feeling like 10C, 1.2C nights, an extraordinarily high 93.8mm across over 16 days and 61 percent humidity.
BigSkyMayRegular · May · 1 month ago · Read more on Tripadvisor ↗
Big Sky-forum threads on March skiing are consistently enthusiastic, posters calling snow conditions rarely a problem this time of year and early March frequently named among the best stretches of the entire season. Regulars describe peak snowpack as typically landing around the first week of March, conditions often surpassing January simply because more has accumulated by then. Posters call the freeze-thaw cycle that defines classic spring skiing as not yet fully underway in March, a real advantage over April. Regulars recommend early-to-mid March as the more dependable target, temperatures generally sitting comfortably in the twenties and thirties Fahrenheit. Posters describe days as noticeably longer and milder than deep winter without sacrificing snow quality. Regulars recommend checking conditions before an April trip. The record: 3.1C days feeling like -1C, -6.3C nights, a notably high 47.1cm of fresh accumulation and 74 percent humidity.
BigSkyMarchRegular · March · 1 month ago · Read more on Tripadvisor ↗
Big Sky-forum threads on September conditions describe a genuinely pleasant pattern, cold mornings giving way to sunny, comfortably warm afternoons, aspen groves beginning their color change and crowds noticeably thinner than peak summer. Posters are direct this doesn't rule out an early accumulation at higher elevation, entirely possible even while the valley floor stays green and mild, a real reminder of how much conditions vary by altitude. Regulars name hiking, mountain biking, fly fishing and horseback riding all still genuinely strong September activities, the cooler air a real relief after the intensity of midsummer. Layers are standing advice regardless of how warm the afternoon runs, given how sharply temperatures drop once the sun goes down. Posters call September a real sweet spot for anyone prioritizing scenery and quiet over guaranteed warm weather. The record: 19.4C days feeling like 18C, 7.2C nights, a notably high 9cm of fresh accumulation and 60 percent humidity.
BigSkySeptemberRegular · September · 1 month ago · Read more on Tripadvisor ↗

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Big Sky climate normals — July

Daytime high26°C / 78°F🌤 warm
Nighttime low12°C / 54°F
Feels like (high)25°C / 77°F
Rainfall38 mm / 1.5 in🌦 some rain
Rainy days10 days
Humidity53%🍃 comfortable
Dew point8°C / 46°F
Sunshine13.7 h/day
Daylight15.2 h
Wind13 km/h / 8 mph
Snowfall0.2 cm / 0.1 in
Air quality (US AQI)48🍃 good

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

Crowds in Big Sky in July

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.

Peak crowdstravelers describe it as peak season, Fourth of July in the mountains, Big Sky PBR

Sourced from traveler notes: “…ky-forum threads on a July visit describe this as genuinely peak season, posters recommending the chairlift or gondola up the mount…” — BigSkyJulyRegular

JFMAMJJASOND

Peak crowdsBusyShoulder seasonQuiet

Best months for Big Sky'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 weatherBig Sky's weather peaks December–February.

July coincides with Wildfire smoke season.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Big Sky in July

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Opening

    Yellowstone roads open

    15 Apr – 5 Nov · usuallyTrail seasonClosures

    The interior roads out of West Yellowstone are ploughed open in stages from mid-April and close again to cars in early November, after which it is snowcoach or nothing. Big Sky is an hour from that gate. Source ↗

  • Festival

    Music in the Mountains

    1 Jun – 10 Sep · usuallyMusic festival

    Free Thursday-evening concerts in Town Center park from early June to the start of September. Bring a blanket and something warm; the temperature drops the moment the sun goes behind Lone Peak. Source ↗

  • Holiday

    Fourth of July in the mountains

    3–5 JulNational holidayCrowdedBook early

    The Fourth of July weekend is one of the busiest of the mountain summer: lodging and campsites book out and roads into town are slow. Fireworks are often cancelled or replaced by drone shows when wildfire danger runs high. Source ↗

  • Festival

    Big Sky PBR

    17–19 JulSporting eventCrowdedBook early

    Three nights of professional bull riding in the events arena in the middle of July, and the busiest week of the Big Sky summer. Rooms in the valley go months ahead and the concerts run after the last ride. Source ↗

  • Hazard

    Wildfire smoke season

    15 Jul – 30 Sep · usually

    Most Augusts bring some smoke into the Gallatin Canyon from fires in Montana, Idaho and further west. The county issues air quality alerts, Lone Peak goes hazy, and hard hikes and lift-served biking are best moved to clear days. Source ↗

What's on around the world in July →

Nearby, and something's on

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

Where is Big Sky?

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Big Sky in July — FAQ

Is July a good time to visit Big Sky?
July in Big Sky: warm, a little rain, with clean air — one of the weakest months to visit. It ranks #11 of 12 months for Big Sky on SeasonMap's comfort score (14/100).
What is the weather like in Big Sky in July?
In July, Big Sky averages a daily high of 25.7°C and a low of 12°C, with about 38.4 mm of rain over roughly 10.2 rainy days.
What is the air quality in Big Sky in July?
Big Sky has a mean US Air Quality Index of about 48 in July.

Within 300 km: Bozeman's Mountain wildflowers around 20 Jun – 5 Aug, and Yellowstone National Park's Beartooth Highway open around 22 May – 12 Oct.