Apex Wx

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Thursday, October 8 – Saturday, October 10

Overview:  A cold front crossing northern Maine Thursday, accompanied by an upper-level disturbance, will bring widespread showers and the possibility of isolated thunderstorms. Increasing afternoon instability and colder air aloft could support small hail in a stronger shower, although severe weather is not expected. Despite the high probability of precipitation, rainfall should remain moderate, with 0.25–0.50 inch expected around Fort Kent and locally higher amounts possible in thunderstorms. Although welcome given ongoing dry conditions, this rainfall is unlikely to provide substantial drought relief. Temperatures will reach the upper 50s before cooler air begins moving into the Saint John Valley behind the front.

Cooler west to northwest flow develops Thursday night into Friday as an upper-level trough moves across the region. Lingering moisture and instability will maintain a 40% chance of showers Friday, while west winds around 10–15 mph may gust near 25 mph. Temperatures fall back into the lower 50s before skies begin clearing Friday night. Lows could reach the upper 20s, although lingering winds may limit frost formation in exposed locations.

High pressure builds toward northern New England Saturday, bringing sunny, dry, and colder conditions. Northwest winds will remain brisk, with occasional gusts around 25 mph, while highs reach only the upper 40s. Saturday night will bring another period of subfreezing temperatures, with lows in the upper 20s and frost likely where winds diminish, particularly in sheltered portions of the Valley

Thursday: Mostly cloudy with numerous showers and isolated thunderstorms possible during the afternoon. The chance of rain is around 70%, with 0.25–0.50 inch of rainfall expected. Highs will reach the upper 50s. South to southwest winds around 5–10 mph may gust near 20 mph. Thursday night will become partly cloudy as showers diminish, with a 50% chance of lingering evening rain and lows in the mid-30s.

Friday: Partly sunny, cooler, and breezy, with a 20% chance of afternoon showers. Most of the day should remain dry. Highs will reach the lower 50s, with west winds around 10–15 mph and occasional gusts near 25 mph. Friday night will become mostly clear and colder, with lows in the upper 20s to lower 30s. Frost is possible in sheltered portions of the Valley, although lingering winds may limit cooling in more exposed locations.

Saturday: Mostly sunny, dry, and seasonably cool as high pressure builds across northern Maine. Highs will reach the lower 50s. Northwest winds may remain somewhat brisk during the day before gradually diminishing. Saturday night will be mostly clear initially, becoming partly cloudy later, with lows in the lower 30s. Frost remains possible, especially in sheltered valleys where winds become light.

Sunday, October 11 – Wednesday, October 14

Overview: High pressure shifting south and east of New England will establish a strengthening southwest flow Sunday, bringing unusually mild weather to northern Maine. Sunshine, warm advection, and daytime mixing should allow temperatures to reach the upper 60s, with southwest winds occasionally gusting around 20–25 mph. Increasing clouds and persistent southwest flow will limit nighttime cooling, keeping temperatures in the upper 40s.

The warm pattern continues Monday, with highs potentially reaching the upper 60s to around 70°F. Meanwhile, the remnants of Tropical Storm Isaias are expected to remain well south of the Saint John Valley, while a separate low-pressure system developing over the Great Lakes becomes the primary influence on the Valley. Increasing moisture ahead of this system will bring scattered showers Monday, with rain becoming more likely Monday night.

A frontal system approaching Tuesday will bring increasing cloud cover, additional rain chances, and a gradual return to cooler conditions. Temperatures should fall into the middle to upper 50s Tuesday before colder Canadian air becomes more influential Tuesday night into Wednesday. Highs Wednesday may reach only the upper 40s, with lingering precipitation potentially mixing with snow, particularly across higher terrain. Confidence remains lower regarding the timing of the frontal passage, precipitation type, and extent of cooling.

Sunday: Mostly sunny and unusually mild for mid-October. Highs will reach the upper 60s, with southwest winds around 10–15 mph and occasional gusts near 20–25 mph. Sunday night will become increasingly cloudy as moisture begins returning to northern Maine, with lows in the upper 40s. Conditions should remain predominantly dry overnight.

Monday: Partly sunny and continued mild, with highs in the upper 60s to around 70°F. Southwest winds will remain somewhat breezy. A 30% chance of rain develops as moisture increases ahead of the next frontal system. Monday night will turn mostly cloudy, with rain becoming more likely as low pressure approaches from the Great Lakes. Overnight lows should fall into the upper 30s to around 40°F.

Tuesday: Mostly cloudy and cooler, with a 40% chance of rain as the approaching frontal system begins influencing northern Maine. Temperatures should reach the middle to upper 50s, although the timing of the colder air remains uncertain. Tuesday night will remain mostly cloudy with additional rain possible and lows in the middle 30s. A transition toward mixed precipitation cannot be ruled out if colder air arrives while showers continue.

Wednesday: Mostly cloudy and considerably cooler as the frontal system moves through or east of northern Maine. Highs should reach the upper 40s, with lingering rain showers possible. Some precipitation could mix with snow, particularly across higher terrain, although confidence in precipitation type remains limited. Wednesday night will remain mostly cloudy and colder, with lows in the upper 20s to around 30°F.

The latest CPC outlook favors below-normal temperatures, while precipitation probabilities are classified as equal chances across Fort Kent and the Saint John Valley. The evolving pattern may allow periodic intrusions of colder Canadian air, although considerable model disagreement continues to limit confidence in the week-two forecast. Typical mid-October temperatures across the Valley feature daytime highs in the upper 40s to lower 50s and overnight lows in the lower to middle 30s.

Outlooks updated 7-9 AM weekdays & 8-10 AM weekends and holidays. Long range outlooks indicate broader temperature and precipitation trends rather than precise day-to-day forecasts. Common abbreviations: NWS = National Weather Service; WPC = Weather Prediction Center; SPC = Storm Prediction Center; CPC = Climate Prediction Center, NHC = National Hurricane Center

Updated every 3-6 hours from NWS Caribou

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.
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• 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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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.

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