Vejret i Big Sky i september

Big Sky i september: behageligt, lidt regn, med ren luft — ikke det bedste tidspunkt at tage afsted.

Opdateret september 2026 · klimanormaler fra ERA5-reanalysen

Big Sky🇺🇸 United States · Rocky Mountains · Ski23
  1. 90jan.
  2. 94feb.
  3. 83mar.
  4. 77apr.
  5. 50maj
  6. 20jun.
  7. 14jul.
  8. 12aug.
  9. 23sep.
  10. 59okt.
  11. 74nov.
  12. 87dec.

Nr. 9 af 12 måneder i Big Sky · Nr. 1362 af 1413 rejsemål at besøge i september · komfort 23/100 (niveau F)

Dage
19°C
Nætter
7°C
Våde dage
10
Sol
10.3 h
Luftfugtighed
60%
Dagslys
13 h
Big Sky, United States
Foto: Alex Moliski · Pexels

Noter fra rejsende om Big Sky i september

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 · for 3 dage siden · Læs mere på Tripadvisor ↗

Andre måneder i 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 · for 2 dage siden · Læs mere på 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 · maj · for 3 dage siden · Læs mere på Tripadvisor ↗
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 · juli · for 3 dage siden · Læs mere på 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 · marts · for 3 dage siden · Læs mere på Tripadvisor ↗

Tilføj din egen note fra Big Sky på kortet.

Klimanormaler for Big Sky — september

Dagtemperatur19°C / 67°F😎 behageligt
Nattemperatur7°C / 45°F
Føles som (dag)17°C / 63°F
Nedbør63 mm / 2.5 in🌦 lidt regn
Regnvejrsdage10 dage
Luftfugtighed60 %🍃 behageligt
Dugpunkt4°C / 40°F
Solskin10.3 t/dag
Dagslys12.5 t
Vind12 km/t / 8 mph
Snefald9 cm / 3.5 in
Luftkvalitet (US AQI)39🍃 god

Månedsgennemsnit fra ERA5-reanalysen. AQI er det gennemsnitlige amerikanske luftkvalitetsindeks for måneden.

Travlhed i Big Sky i september

Hvor travlt der er på selve stedet — skoleferier og masseferier, de måneder en redaktør har markeret, og hvor eftertragtet vejret gør dem. Aldrig en del af komfortscoren.

TravltSummer break i United States(anslået)

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TætpakketTravltSkuldersæsonStille

Bedste måneder for vejret i Big Sky

Rangeret efter dette rejsemåls egen klimakomfortscore året igennem — noget andet end, hvor travlt der bliver (se Travlhed ovenfor).

Pænt vejrVejret i Big Sky topper december–februar.

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Bedste vejrPænt vejrHårdeste vejr

Det sker i Big Sky i september

Tilbagevendende sæsonbegivenheder, naturfænomener, lukninger og helligdage — kurateret og med kilder.

  • Åbning

    Yellowstone roads open

    15. apr. – 5. nov. · normaltVandresæsonLukninger

    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. Kilde ↗

  • Festival

    Music in the Mountains

    1. jun. – 10. sep. · normaltMusikfestival

    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. Kilde ↗

  • Risiko

    Wildfire smoke season

    15. jul. – 30. sep. · normalt

    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. Kilde ↗

Det sker rundt om i verden i september →

Lige i nærheden sker der noget

Inden for 300 km fra Big Sky — en dagstur eller et kort hop — hvor der sker noget denne måned. Aldrig en del af komfortscoren.

Hvor ligger Big Sky?

Indlæser kort…

Big Sky i september — ofte stillede spørgsmål

Er september et godt tidspunkt at besøge Big Sky?
Big Sky i september: behageligt, lidt regn, med ren luft — ikke det bedste tidspunkt at tage afsted. Måneden ligger nr. 9 ud af 12 for Big Sky på SeasonMaps komfortscore (23/100).
Hvordan er vejret i Big Sky i september?
I september har Big Sky i gennemsnit en dagtemperatur på 19.4 °C og en nattemperatur på 7.2 °C, med omkring 62.9 mm regn fordelt på cirka 9.7 regnvejrsdage.
Hvordan er luftkvaliteten i Big Sky i september?
Big Sky har et gennemsnitligt amerikansk luftkvalitetsindeks på omkring 39 i september.
Sner det i Big Sky i september?
Big Sky får omtrent 9 cm sne i september.

Inden for 300 km: Bozeman's Golden eagle migration, omkring 15. sep. – 31. okt. og Yellowstone National Park's Beartooth Highway open, omkring 22. maj – 12. okt..

Vejret i Big Sky i september: 19 °C, 10 regnvejrsdage, 10 t sol | SeasonMap