アスペン 8月の天気
アスペンの8月:暖かい、ときどき雨、空気がきれい — 一年で最も訪れにくい月のひとつ。
2026年9月更新 · ERA5再解析による気候平年値
アスペンでは12か月中11位 · 8月に訪れたい旅行先で1413か所中1376位 · 快適スコア14/100(Fランク)
- 日中
- 25°C
- 夜
- 9°C
- 雨の日
- 8
- 日照
- 12.2 h
- 湿度
- 57%
- 日の長さ
- 14 h

8月のアスペンについての旅行者の声
Forum posters describe August as consistently great - typically 75-79F, rarely breaking 80F even at the height of summer, making for comfortable hiking and biking throughout the day. Afternoon showers in the mountains are a regular feature, but posters say they come and go quickly and mornings are reliably good, so they rarely derail a full day outdoors. Mosquitoes aren't much of a concern in Aspen proper, though posters note a wetter summer can bring more of them out near lakes on a hike. August also counts as locally busy thanks to a full slate of cultural programming - classical music, dance and other festivals - that posters say is worth building an itinerary around alongside the hiking and biking.
アスペンのほかの月
Aspen-forum threads on an April visit describe Aspen Mountain and Snowmass as typically staying open to around April twentieth, posters naming Buttermilk as closing earlier and Highlands roughly a week before, though Highlands can extend on weekends after a fresh dump. Regulars call spring days here genuinely bluebird, several posters naming softening afternoon corn snow and fewer crowds as real advantages over peak winter. Posters call closing-day traditions a real feature of the season's end, several regulars naming Bacon Appreciation Day at Buttermilk and Hawaiian shirts on Aspen Mountain as standard send-offs. Regulars call real sun protection genuinely necessary despite the cold air, several threads warning glare off remaining snow catches visitors off guard. Posters recommend checking closing dates before an April trip, several regulars calling this standard given how much they vary. The record: 11.2C days, -2.5C nights, 58.4mm across nearly 9 days and 65 percent humidity.
Aspen-forum threads on a June visit describe early June as genuinely quiet compared with later in the month, posters calling the transition from lingering cover to wildflowers still underway at the start. Regulars call higher elevations capable of holding real accumulation well into June depending on the season's snowpack. Posters recommend Maroon Bells as a real must, though parking requires taking a shuttle bus this time of year rather than driving directly. Regulars call Aspen genuinely pricier than many comparable mountain towns, summer visitors describing it as aimed at a wealthier crowd. Posters recommend hiking and biking as strong June options once the month gets fully underway, conditions considered reliable by mid-month. The record: 23.3C days feeling like 24C, 7C nights, 26.4mm across nearly 5 days and 38 percent humidity.
Aspen-forum threads on early March describe conditions as genuinely excellent by seasonal standards, posters calling this stretch through mid-March the best combination of deep base and manageable crowds before Spring Break arrives. Regulars call the snow base near its peak for the season, expert terrain still holding real texture with long mogul runs not yet groomed flat. Posters describe daytime readings in town as comfortably mild while mid-mountain stays genuinely cold, a proper shell layer standing advice for the upper lifts regardless of how warm Aspen itself feels. Regulars call March hard to predict, some years delivering the best skiing of the season. Posters recommend booking before Spring Break hits if flexible, crowds climbing considerably once that window opens. Regulars call Aspen and Snowmass both worth checking for the better conditions on a given day. The record: 6.4C days feeling like 3C, -6.3C nights, 72.3mm across over 10 days and 69 percent humidity.
Aspen-forum threads on Maroon Bells and Independence Pass conditions describe September mornings as clear, crisp and genuinely gorgeous, most days comfortable in the low seventies Fahrenheit with plenty of sunshine. Posters call a brief afternoon shower a near-daily feature, the odds rising as the day wears on. Regulars are direct nights can plunge into the thirties and forties, and posters describe real accumulation as entirely possible mid-month, one visitor reporting a night with a genuine dusting during an otherwise mild week. Posters recommend real layers covering the range from cold mornings to a warm midday. Regulars call the changing aspen groves the reason locals name September their favorite month. Posters recommend checking current pass conditions before a high-elevation drive given how quickly things can turn. The record: 21.7C days feeling like 20C, 5.9C nights, a notably high 3cm of fresh accumulation and 55 percent humidity.
地図のアスペンのカードから自分のメモを追加できます。
アスペンの気候平年値 — 8月
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。
8月のアスペンの混雑
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、主な訪問国のうち2か国で学校休暇(推定)
ピークの混雑混雑ショルダーシーズン閑散
アスペンの天気が良い月
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)。
天気が厳しいアスペンの天気がピークを迎えるのは12月〜2月で、特に良いのは1月ごろです。
8月はAfternoon monsoon stormsと重なります。
天気が最高天気はまずまず天気が厳しい
8月のアスペンのイベント
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。
- ルール
Maroon Bells reservations
5月15日〜10月31日早めの予約をMaroon Creek Road is reservation-only for the whole open season: a parking slot or a shuttle seat from Aspen Highlands, both booked in advance. Nothing about turning up unannounced works here. 出典 ↗
- 祭り
Aspen Music Festival
7月1日〜8月23日 · 例年Eight weeks of concerts under the tent at the Benedict Music Tent, hundreds of them free or cheap, with students practising in the open all over the west end. It runs July into late August. 出典 ↗
- 自然
Alpine wildflowers
7月1日〜8月10日 · 例年野の花・花の見頃Columbine on the Cathedral Lake and Crater Lake trails from the first week of July, later and better the higher the trail starts. Afternoon storms are the reason people walk early here. 出典 ↗
- 要注意
Afternoon monsoon storms
7月5日〜9月5日 · 例年嵐のシーズンMidsummer pulls moisture up the Rockies and builds thunderheads over the peaks most afternoons. Above tree line the rule is simple: be off the ridge by noon. 出典 ↗
近くで開催中のイベント
アスペンから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。
アスペンはどこにある?
8月のアスペン — よくある質問
- 8月はアスペンを訪れるのに良い時期ですか?
- アスペンの8月:暖かい、ときどき雨、空気がきれい — 一年で最も訪れにくい月のひとつ。SeasonMapの快適スコアでは、アスペンの12か月中11位です(14/100)。
- 8月のアスペンはどんな天気ですか?
- 8月のアスペンは、平均最高気温24.6°C、最低気温9.4°C、降水量は約47.8 mmで、雨の日はおよそ7.9日です。
- 8月のアスペンの大気質はどうですか?
- 8月のアスペンの米国大気質指数(US AQI)は、平均約44です。
300 km圏内:VailのBravo! Vail(6月25日〜8月6日ごろ)、Rocky Mountain National ParkのTrail Ridge Road season(5月25日〜10月15日ごろ)。