Apex Wx

Overview:   High pressure to the south will provide dry and unusually mild weather across northern Maine Thursday, while low pressure moving through Canada approaches from the northwest. Southwest flow between these systems will draw warmer air into the County, with temperatures climbing into the 70s. The tightening pressure difference will also produce a breezy afternoon, with southwest gusts to around 20 mph.

Conditions will change Thursday night as clouds increase ahead of an approaching cold front. Rain will spread into northern Aroostook early Friday, becoming likely as the front crosses the region during the day. Moisture will be somewhat limited across the Valley, so rainfall should generally remain modest — generally less than 0.10 inch — and is unlikely to provide substantial drought relief. As the front moves east Friday evening, winds will turn northwest, showers will diminish, and cooler, drier Canadian air will begin arriving.

High pressure will build toward northern Maine Friday night and Saturday, bringing clearing skies and a much different air mass. Saturday will be sunny, dry, and considerably cooler, with northwest flow reinforcing the early-October chill. Winds should gradually diminish Saturday night, and mostly clear skies will favor strong nighttime cooling, with widespread frost possible between 3 a.m. Saturday night and 8 a.m. Sunday morning.

Thursday: Mostly sunny to partly sunny, warm, and increasingly breezy. Temperatures should reach the lower to middle 70s, with southwest winds increasing during the afternoon and gusting to around 20 mph. Clouds increase Thursday night as the front approaches, with showers becoming possible late. Lows remain mild, generally in the middle 50s.

Friday: Cloudy with rain likely, particularly during the morning and afternoon as the cold front crosses northern Maine. Temperatures should hold mainly in the upper 50s to lower 60s, with a west to northwest wind developing behind the front. NWS guidance places the daytime rain probability around 70% for northwest Aroostook. Rain chances decrease Friday evening, followed by partial clearing and much cooler conditions overnight. Lows fall into the upper 30s to lower 40s.

Saturday: Sunny, dry, and considerably cooler behind the front. Northwest winds may remain somewhat breezy during the day, with highs in the middle to upper 50s. Mostly clear Saturday night with light winds will favor strong cooling, with temperatures falling into the lower 30s and widespread frost possible overnight into early Sunday morning.

Sunday, October 4 – Wednesday, October 7

Overview:  High pressure will remain influential across northern Maine Sunday, providing a dry but frosty start to the period. Clear skies and light winds Saturday night will favor strong cooling, with widespread frost expected early Sunday. Sunshine and developing southerly flow should then allow temperatures to recover considerably during the afternoon.

Clouds will increase Sunday night as the weather pattern becomes more complicated. Low pressure crossing southern Canada will approach at the same time another system moves off the Mid-Atlantic coast. The interaction between these systems will determine how much rain reaches northern Aroostook Monday, making precipitation amounts more uncertain than usual. Rain is likely during the day, particularly from late morning onward, but current guidance does not yet support a dependable rainfall-total range.

The system will move east Monday night, followed by another surge of colder Canadian air. Tuesday will be breezy and noticeably colder, with only a slight chance of a lingering shower before drier air becomes established. High pressure will rebuild Wednesday, bringing mostly sunny skies and some temperature recovery. Clouds begin increasing Wednesday night as the next system approaches, with a slight chance of rain developing toward daybreak Thursday.

Sunday: Widespread frost early, followed by mostly sunny to partly sunny skies. After a cold start, temperatures should recover to the upper 50s to lower 60s. Winds become southerly around 5–8 mph. Clouds increase Sunday night, with a 30% chance of rain late and lows around the lower 40s. 

Monday: Mostly cloudy with rain likely, particularly from late morning onward. Highs should reach the middle to upper 50s, with the NWS currently carrying a 70% rain probability. Rainfall totals remain uncertain because the eventual interaction of the two low-pressure systems has not yet been resolved. Rain remains possible Monday evening before diminishing overnight. Lows fall into the lower 30s.

Tuesday: Partly sunny, breezy, and noticeably colder. A lingering rain shower is possible, but the chance is only around 20%. Renewed Canadian air should hold afternoon temperatures around the upper 40s to near 50°F. Partly cloudy and dry Tuesday night with lows around 30°F, with colder readings possible in sheltered locations.

Wednesday: High pressure will provide mostly sunny and dry conditions during the day. Temperatures should moderate somewhat, with highs in the middle to upper 50s. Partly cloudy Wednesday night with lows in the upper 30s. A slight chance of rain develops after 4 a.m. Thursday as the next system begins to approach.

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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