Apex Wx

Overview: High pressure responsible for the chilly start to Sunday will shift east of Maine, allowing southerly flow to develop ahead of an occluding low crossing northern Quebec and a separate coastal low moving toward Nova Scotia. After morning frost and patchy valley fog, increasing clouds and warm advection will help temperatures recover into the upper 50s. Moisture increases Sunday night as the two systems begin influencing northern Maine, with rain developing toward Monday morning.

Rain should become widespread Monday as stronger upper-level forcing approaches from the west while Atlantic moisture is drawn northward. Despite the high probability of rain, this does not appear to be a substantial precipitation event. Around 0.25–0.50 inch is possible near Fort Kent, with somewhat lower amounts elsewhere, providing only limited relief from ongoing dry conditions. Rain tapers during the afternoon and evening as the front crosses the County and winds turn west.

The more significant impact follows the front. Deepening low pressure over the northern Maritimes and strong high pressure advancing toward the Great Lakes will create a tight pressure gradient Monday night into Tuesday. Cold advection and daytime mixing should produce west winds around 20–25 mph Tuesday, with gusts 35–40 mph and locally higher. Considerable leaf loss near peak foliage and isolated power outages are possible before winds gradually diminish Tuesday night.

Sunday: Widespread morning frost and patchy fog will give way to increasing clouds. Temperatures should recover into the upper 50s, with south winds around 5–10 mph and occasional gusts near 20 mph. Sunday night will be mostly cloudy, with a 30% chance of showers developing late. The increasing clouds and southerly flow will keep temperatures considerably milder than Saturday night, with lows in the lower to middle 40s. 

Monday: Rain will become widespread during the morning, accompanied by patchy fog, before gradually tapering during the afternoon as the front crosses northern Maine. The chance of rain is around 90%, with approximately 0.25–0.50 inch currently forecast around Fort Kent. Highs will reach the lower to middle 50s. South winds around 10–15 mph will turn west during the afternoon, with gusts increasing behind the front. Monday night will become mostly cloudy and increasingly brisk, with only a slight chance of lingering evening rain. Lows fall into the lower to middle 30s, while west winds may gust around 30 to 35 mph.

Tuesday: Partly sunny, colder, and very windy as strong cold advection continues behind the departing system. Highs should reach only the upper 40s to lower 50s. West winds around 20–25 mph will frequently gust 35–40 mph, with locally stronger gusts possible across northern Aroostook. Considerable leaf loss and isolated power outages are possible. Winds gradually diminish Tuesday night as high pressure becomes more influential, allowing temperatures to fall into the upper 20s to around 30°F with frost developing toward Wednesday morning.

Wednesday, October 7 – Saturday, October 10

Overview: Tuesday will bring the most significant weather of the period as deep low pressure over the northern Maritimes and strong high pressure building toward the Great Lakes create a tight pressure difference across northern Maine. West winds will strengthen considerably, with gusts potentially reaching 35–40 mph across the County. The combination of strong winds and temperatures near 50°F will make for a chilly and blustery day. Substantial leaf loss is possible where foliage remains near peak, along with isolated power outages.

The pressure difference will relax Tuesday night as high pressure moves closer, allowing winds to diminish substantially. Wednesday should be much quieter, with mostly sunny skies, lighter winds, and dry conditions.

The high will shift east Wednesday night as another disturbance approaches, bringing increasing clouds and a chance of rain toward Thursday. Temperatures will moderate as southerly flow develops, but the pattern becomes increasingly unsettled Thursday into Friday. Rain chances generally increase from around 30–40% Thursday into Thursday night to near 50% Friday, although considerable dry time remains possible. Forecast confidence in the timing and rainfall amounts remains limited at present.

Wednesday: A quiet and seasonably cool day as high pressure moves across the region. Skies should be mostly sunny, with highs in the lower to middle 50s and substantially lighter winds than Tuesday. Clouds increase Wednesday night as the next disturbance approaches, with a 30% chance of rain developing late. Lows should fall into the upper 30s.

Thursday: Partly sunny with a 40–50% chance of rain, particularly as the approaching disturbance and frontal boundary move through northern Maine. Temperatures moderate into the upper 50s to around 60°F. Rainfall amounts currently appear light, and considerable dry time remains possible. Mostly cloudy Thursday night with lingering rain chances and lows in the upper 30s.

Friday: Partly sunny and somewhat cooler, with another 30–50% chance of rain or showers as additional shortwave energy crosses the region. Highs should reach the middle to upper 50s. Current guidance does not support substantial precipitation, and shower timing remains uncertain at this range. Friday night should be mostly cloudy with a continuing chance of showers and lows in the middle 30s.

Saturday: Partly sunny and cooler, with highs in the lower to middle 50s. A lingering shower cannot be completely ruled out early, but the overall trend is toward drier conditions as high pressure builds into the region. Skies become partly cloudy Saturday night, with lows falling into the lower 30s.

Weather Notice

Apex Wx forecasts are based on available observations, computer model guidance, and other meteorological data. Conditions and forecast guidance can change, and information displayed here may not reflect the latest official forecast or warning information. Always visit NWS Caribou for the latest official forecasts, watches, warnings, and advisories for northern Maine.

Apex Wx is a private weather information service unaffiliated with NOAA or the National Weather Service and operated by Joseph Becker. Dr. Becker earned a Certificate in Weather Forecasting from Penn State University and is a trained NWS SKYWARN Storm Spotter.

Credits

• Sun and Moon data from the U.S. Naval Observatory, with additional astronomical information from timeanddate.com.
• NOAA warning banner provided by WillyWeather.com.
• Through December 2026, additional archived Apex Wx weather data are available through the University of Utah's MesoWest.
• Current and archived Apex Wx weather data are available through Synoptic Data, the successor to MesoWest.
• Apex Wx logo by Joanna Becker © 2016. Visit Bushi and Brush Arts Dojo.

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