Apex Wx

Overview
Strong 1030 millibar (30.42 inHg) high pressure will build directly across northern Maine Saturday, bringing dry weather, increasing sunshine, and a cool early-October afternoon. As the center of the high settles over the region Saturday night, skies will remain mostly clear and winds will become light or calm. These conditions will favor strong nighttime cooling, with temperatures falling into the upper 20s to around 30°F across the Valley and widespread frost developing overnight into early Sunday.

The high will shift east Sunday, allowing southerly flow to develop. After the frosty start, temperatures should recover into the upper 50s while clouds gradually increase ahead of the next weather system. Patchy valley fog may develop Sunday night as moisture increases.

Conditions deteriorate Monday as low pressure moving through Canada interacts with another system near the East Coast. Rain should become widespread Monday, with current guidance suggesting roughly 0.25–0.50 inch, although amounts remain unusually uncertain because the interaction between the two systems is not yet resolved. Winds will shift west behind the system and become increasingly gusty late Monday. Rain should diminish Monday evening, followed by colder air and the potential for substantially stronger west winds Tuesday.

Saturday: Any early fog should dissipate quickly, followed by sunny and dry conditions. Highs should reach the middle 50s, with northwest winds around 5–10 mph and occasional higher gusts. Mostly clear Saturday night with winds becoming calm. Temperatures fall into the upper 20s to around 30°F, with widespread frost developing after midnight.

Sunday: Widespread frost early, followed by increasing clouds. Afternoon temperatures recover into the upper 50s, with light winds becoming southerly. Mostly cloudy Sunday night with lows in the lower to middle 40s. Patchy valley fog is possible, while rain chances begin increasing late as the next system approaches.

Monday: Cloudy with rain becoming widespread, especially during the morning and continuing into the afternoon. Highs should reach the lower to middle 50s. Current guidance suggests around 0.25–0.50 inch of rainfall, although totals remain unusually uncertain. South to southeast winds will turn west as the system passes, with gusts increasing into the 20–30 mph range. Rain diminishes Monday evening, followed by mostly cloudy skies and lows in the lower to middle 30s.

Tuesday, October 6 – Friday, October 9

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.

Tuesday: Partly sunny, brisk, and windy, with highs in the upper 40s to lower 50s. West winds should increase to around 18–23 mph, with gusts potentially reaching 35–40 mph. A brief shower cannot be ruled out, and colder guidance even indicates a slight possibility of a mixed rain/snow shower during the morning, with no accumulation expected. Partly cloudy Tuesday night with winds diminishing and lows in the lower 30s.

Wednesday: A quieter and dry day as high pressure builds across the region. Skies should be mostly sunny, with highs in the lower to middle 50s and much lighter winds. Clouds increase Wednesday night, with a 20–30% chance of rain developing late and lows in the upper 30s.

Thursday: Partly sunny and noticeably milder, with highs around the upper 50s to lower 60s. A 30–40% chance of rain develops as the next disturbance approaches, although considerable dry time remains possible. Mostly cloudy Thursday night with a 30–40% chance of rain and lows around 40°F.

Friday: Partly sunny with a chance of rain as the unsettled late-week pattern continues. Highs should reach the middle to upper 50s, with rain chances around 50%. Rainfall amounts and timing remain uncertain. A chance of rain continues through early Friday evening before ending around 9 p.m. Mostly cloudy afterward, with overnight lows falling into the middle 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.

How accurate are forecasts?

Forecast confidence generally decreases as lead time increases. Forecasts for the next few days usually provide considerably more detail and confidence than forecasts a week or more in advance. Beyond about 7 days, forecasts are most useful for identifying broader weather patterns and temperature or precipitation trends rather than predicting exact conditions at a particular place and time.

Individual computer-model runs—especially those depicting specific storms, snowfall amounts, or other details a week or more in advance—should not be treated as forecasts by themselves. Extended forecasts will change as new observations become available and models better resolve the evolving atmospheric pattern. Check updated forecasts as the event approaches.

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