Apex Wx

Fort Kent & the Saint John Valley, Maine
Weather Information

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Thursday, September 10 – Saturday, September 12

Overview: The low-pressure system responsible for Wednesday night’s rain will continue moving east across northern Maine today, with its cold front sweeping through the region. Lingering morning showers will become increasingly scattered before ending as deeper moisture moves east. Behind the front, west to northwest flow strengthens as cooler and progressively drier air spreads into Fort Kent and the Saint John Valley. The pressure difference between the departing low and high pressure building from the west will keep winds noticeable, with gusts around 30 mph possible today.

Friday will be considerably cooler despite increasing sunshine. Lingering clouds gradually diminish as drier air arrives, although a northwest breeze continues through much of the day. High pressure moves closer Friday night, allowing skies to clear and winds to weaken. These conditions favor efficient nighttime cooling, with temperatures near 40°F across much of the Valley and locally colder readings possible in sheltered locations. Saturday brings a substantial rebound as the air mass moderates, with abundant sunshine, lighter winds, and temperatures climbing into the lower to mid-70s.

Thursday: A few showers linger this morning as the frontal system moves through northern Maine, followed by mostly cloudy to partly sunny conditions and decreasing shower coverage. Highs reach the upper 60s to around 70°F. West winds increase to around 15–20 mph, with gusts approaching 30 mph. Thursday night turns partly cloudy, cooler, and drier, with west winds gradually easing to around 10–15 mph. Lows fall into the mid-40s.

Friday: A cooler and breezy day follows the frontal passage. Lingering clouds give way to increasing sunshine as high pressure builds toward the Valley, with highs only in the upper 50s to lower 60s. Northwest winds remain noticeable during the day. Friday night becomes clear as winds diminish, allowing temperatures to fall to around 40°F, with locally colder readings possible in sheltered Valley locations.

Saturday: High pressure provides an excellent start to the weekend. Mostly sunny to sunny skies, dry conditions, and much lighter winds accompany a substantial temperature rebound, with highs reaching the lower to mid-70s. Saturday night begins mostly clear before some clouds increase later as high pressure shifts east. Lows settle into the upper 40s to around 50°F.

Sunday, September 13 – Wednesday, September 16

Overview: The pleasant weather Saturday will be relatively short-lived as high pressure shifts east and a strengthening south to southwest flow develops ahead of the next cold front approaching from Canada. Milder and increasingly humid air will spread into northern Maine Saturday night into Sunday, with clouds thickening and showers becoming increasingly likely. Rain may become fairly widespread Sunday, with locally moderate amounts possible, and enough instability may develop for an isolated thunderstorm.

The front moves east Sunday night, followed by a pronounced change Monday as cooler and drier west to northwest flow spreads across Fort Kent and the Saint John Valley. Some sunshine will return, although a northwest breeze will reinforce the cooler feel. High pressure moves closer Monday night, allowing winds to diminish and temperatures to fall toward 40°F, with colder sheltered locations potentially reaching the upper 30s. Tuesday provides a brief period of mainly dry, seasonably cool weather before clouds increase and another frontal system brings renewed shower chances Tuesday night.

Sunday: Clouds increase as the next cold front approaches northern Maine, with showers becoming increasingly likely and an isolated thunderstorm possible. Highs reach the lower to mid-70s as southerly flow brings milder and more humid air into the Valley. Rain may become widespread for a time, with locally moderate amounts possible. Showers taper Sunday night as the front moves east and winds turn west, with lows in the lower to mid-50s.

Monday: A notably cooler day follows the frontal passage. Lingering clouds give way to intervals of sunshine as drier west to northwest flow spreads across northern Maine. Highs reach only the upper 50s to lower 60s, with a noticeable northwest breeze. Monday night becomes partly cloudy to mostly clear as winds diminish. Lows fall to around 40°F, with upper 30s possible in colder sheltered Valley locations.

Tuesday: High pressure provides a mainly dry and seasonably cool day, with a mixture of sunshine and clouds and highs in the mid-60s. Winds remain relatively light before clouds increase later as another frontal system approaches. Tuesday night becomes mostly cloudy with a chance of showers, with lows around 50°F.

Wednesday: The latest guidance favors improving conditions as the frontal system moves east. Clouds gradually give way to increasing sunshine, with highs recovering into the mid- to upper 60s. West to northwest winds may remain somewhat noticeable behind the front before diminishing later. Wednesday night trends mostly clear and seasonably cool, with lows generally in the lower to mid-40s.