アーカディア国立公園の月別の天気

Acadia-forum threads on a January visit describe most of Park Loop Road as genuinely closed for winter, posters naming the section past Sand Beach and Thunder Hole as the real exception that stays plowed, parking included. Regulars call the carriage roads a real draw when snow allows, several posters naming grooming for cross-country skiing as a standard winter feature here. Posters call Cadillac Mountain Sports in Bar Harbor the real place to rent skis, several regulars naming this the standard way to get outfitted for a January visit. Regulars call a handful of local restaurants genuinely still open on winter weekends, several threads naming Red Sky, Rogue Cafe and Side Street Cafe among the options. Posters recommend confirming current road and trail conditions before a January trip, several regulars calling this standard given how much winter access varies. The record: 0C days, -7.9C nights, an extraordinarily high 113.6mm across nearly 10 days and 75 percent humidity.

Acadia-forum threads on an April visit describe this as genuinely mud season locally, posters calling a real difference between early April, which often still feels like winter, and the later part of the month. Regulars call daytime temperatures typically in the mid-fifties with nights dropping into the mid-thirties, a surprise flurry still possible even late in the month. Posters call the Loop Road usually not opening until around April 15, access considerably more limited before that date. Regulars call trails here a mix of icy patches and real mud, though the upside is black flies haven't emerged yet this early in spring. Posters recommend Blackwoods for self-check-in camping given how many other campgrounds stay closed, most posters recommending June or October instead for a fuller Acadia experience. The record: 8.5C days feeling like 7C, 0.6C nights, an extraordinarily high 117.3mm across over 11 days and 72 percent humidity.

Acadia's forum calls June generally good — mild with cool evenings and noticeable morning fog along the coast, early June often bright and sunny with highs in the 70s°F. Regulars flag black flies as a genuine nuisance this time of year, worth packing repellent for, and note wildflowers including lupine fields are in full bloom, with late June typically more reliable weather-wise than early June.

July in Acadia is sun with ocean fog mixed in - forum forecasts for the second week run lows in the upper 50s F and highs near 70, with warmer spells reported some years, and morning sea fog common enough to plan around. One 4 July visitor found it foggy enough not to bother with Cadillac at all; another argues a foggy day is the best time to go up, to watch it pour into Frenchman Bay. The practical July facts: Cadillac's summit road needs a timed-entry pass booked online, rangers hold traffic for about half an hour when the lot fills, and Sand Beach, Jordan Pond House and the summit are the three places that get crowded. The record: 21C days, 13.8C nights, 7.8 precipitation days, humidity 84 percent, and a 14.9C sea.

Acadia-forum threads on September visits describe conditions as genuinely mild through the day, comfortable enough for swimming in the lakes earlier in the month, evenings turning cool but never harsh. Posters describe a real range across the month, one stretch bringing fog and a cooler, damper day near the fifties Fahrenheit while another delivers sunny mid-seventies the same week. Regulars call September a genuine sweet spot for crowds, kids back in school and leaf-peeping still weeks away, the park noticeably emptier than peak summer. Posters recommend real layers, conditions here shifting meaningfully day to day. Regulars describe every restaurant and attraction as still fully open in September, unlike the wind-down by mid-October. Posters call Cadillac Mountain sunrise and the carriage roads genuine highlights regardless of conditions. The record: 18.4C days feeling like 18C, 10.5C nights, an extraordinarily high 93mm across nearly 7 days and 81 percent humidity.

Acadia-forum threads on October fall foliage consistently name mid-month, around the 12th to 20th in a typical year, as the strongest bet for peak color, early October still mostly bright reds and yellows with the display shifting toward bronze and gold by the back half of the month. Posters are candid the display is genuinely uneven at any single point - one tree can be at brilliant peak while another nearby has already gone dull, and a third stays green, so a visit any week in October usually catches something worthwhile. Days stay comfortable, dipping into the 40s or 50s Fahrenheit at night, a real jacket standing advice for evening viewpoints like Cadillac Mountain. Late October is called leafless but still scenic thanks to the park's abundant pine cover, and no accumulation is typically expected that late in the month. The record: 13.6C days feeling like 11C, 6C nights, 117mm across 9.6 days, a 12.8C sea, 78 percent humidity and 7.1 hours of sun.

Acadia-forum threads on a November visit describe the Park Loop Road and Cadillac Mountain drive as still genuinely doable this time of year, posters calling the views actually better once the leaves have dropped. Regulars call most shops and restaurants in town closed for the season by November, though the park itself never shuts down regardless of month. Posters describe mid-November as capable of turning properly wintry, real snow possible on any given day this late in the month. Regulars recommend real layers and waterproof boots regardless of forecast, conditions here shifting quickly once a coastal system moves through. Posters call the quieter trails a genuine upside this time of year, crowds a fraction of the summer peak. Regulars recommend checking current park and road conditions directly before any hike, especially on the higher trails. The record: 7.4C days feeling like 3C, -0.3C nights, 115.6mm across over 10 days and 72 percent humidity.

Forum posters note Acadia often lacks reliable snow cover even in December, so a classic snowy postcard scene isn't guaranteed this early in winter. The Park Loop Road officially closes December 15th (earlier if snow or ice arrives first), but posters point out meaningful access remains: the Ocean Road section past Sand Beach and Thunder Hole stays plowed, along with routes to Sieur de Monts and Jordan Pond. If enough snow does fall, some of the park's carriage roads get groomed for cross-country skiing. Posters describe a handful of hotels and restaurants staying open through the winter, and consistently frame a December visit as trading limited road access and services for a genuinely quiet, uncrowded version of the park.