Big Sky 9月の天気

Big Skyの9月:快適、ときどき雨、空気がきれい — ベストとはいえない時期。

2026年9月更新 · ERA5再解析による気候平年値

Big Sky🇺🇸 アメリカ合衆国 · ロッキー山脈 · スキー23
  1. 901月
  2. 942月
  3. 833月
  4. 774月
  5. 505月
  6. 206月
  7. 147月
  8. 128月
  9. 239月
  10. 5910月
  11. 7411月
  12. 8712月

Big Skyでは12か月中9位 · 9月に訪れたい旅行先で1413か所中1362位 · 快適スコア23/100(Fランク)

日中
19°C
7°C
雨の日
10
日照
10.3 h
湿度
60%
日の長さ
13 h
Big Sky(アメリカ合衆国)
写真: Alex Moliski · Pexels

9月のBig Skyについての旅行者の声

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 · 9月 · 3日前 · Tripadvisorで続きを読む ↗

Big Skyのほかの月

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 · 4月 · 2日前 · Tripadvisorで続きを読む ↗
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 · 5月 · 3日前 · Tripadvisorで続きを読む ↗
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 · 7月 · 3日前 · Tripadvisorで続きを読む ↗
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 · 3月 · 3日前 · Tripadvisorで続きを読む ↗

地図のBig Skyのカードから自分のメモを追加できます。

Big Skyの気候平年値 — 9月

日中の最高気温19°C / 67°F😎 快適
夜の最低気温7°C / 45°F
体感温度(最高)17°C / 63°F
降水量63 mm / 2.5 in🌦 ときどき雨
雨の日数10日
湿度60%🍃 快適
露点4°C / 40°F
日照10.3時間/日
日の長さ12.5時間
12 km/h / 8 mph
降雪量9 cm / 3.5 in
大気質(US AQI)39🍃 良好

ERA5再解析による月平均値です。AQIはその月の平均US AQI(米国大気質指数)です。

9月のBig Skyの混雑

その場所自体の混み具合 — 学校休暇や大型連休、編集部がタグ付けした月、そして天気の良さによる人気の高さ。快適スコアには含まれません。

混雑アメリカ合衆国のSummer break(推定)

123456789101112

ピークの混雑混雑ショルダーシーズン閑散

Big Skyの天気が良い月

この旅行先自身の一年間の快適スコアでランキングしています — 混み具合とは別のものです(上の「混雑」を参照)。

天気はまずまずBig Skyの天気がピークを迎えるのは12月〜2月です。

123456789101112

天気が最高天気はまずまず天気が厳しい

9月のBig Skyのイベント

毎年の季節のイベント、自然の見どころ、休業、祝日 — 厳選し出典を明記しています。

  • オープン

    Yellowstone roads open

    4月15日〜11月5日 · 例年トレイルシーズン休業

    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. 出典 ↗

  • 祭り

    Music in the Mountains

    6月1日〜9月10日 · 例年音楽祭

    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. 出典 ↗

  • 要注意

    Wildfire smoke season

    7月15日〜9月30日 · 例年

    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. 出典 ↗

9月の世界のイベント →

近くで開催中のイベント

Big Skyから300 km以内 — 日帰りやちょっとした移動で行けて、今月何かがある場所です。快適スコアには含まれません。

Big Skyはどこにある?

地図を読み込み中…

9月のBig Sky — よくある質問

9月はBig Skyを訪れるのに良い時期ですか?
Big Skyの9月:快適、ときどき雨、空気がきれい — ベストとはいえない時期。SeasonMapの快適スコアでは、Big Skyの12か月中9位です(23/100)。
9月のBig Skyはどんな天気ですか?
9月のBig Skyは、平均最高気温19.4°C、最低気温7.2°C、降水量は約62.9 mmで、雨の日はおよそ9.7日です。
9月のBig Skyの大気質はどうですか?
9月のBig Skyの米国大気質指数(US AQI)は、平均約39です。
9月のBig Skyは雪が降りますか?
9月のBig Skyの降雪量は、およそ9 cmです。

300 km圏内:BozemanのGolden eagle migration(9月15日〜10月31日ごろ)、Yellowstone National ParkのBeartooth Highway open(5月22日〜10月12日ごろ)。

Big Sky 9月の天気:19°C、雨の日10日、日照10時間 | SeasonMap