Apex Wx

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7-Day Outlook: Thu. July 16 – Wed. July 22, 2026

A cold front will move across the Saint John Valley today with patchy wildfire smoke from areas southeast  of the Hudson Bay drifting into the region behind the front, resulting in periods of reduced visibility and hazy skies. High temperatures will remain in the upper 60s under mostly sunny skies. West winds of 10 to 15 mph, with gusts approaching 25 mph, will add to the cool and breezy feel.

For anyone traveling to the Central Highlands and/or Downeast Maine today, warmer and more humid air ahead of the front will allow scattered showers and thunderstorms to develop during the afternoon. Some storms could become strong, with damaging wind gusts of 50 to 60 mph posing the primary threat. Storms will move offshore quickly by early evening, with improving conditions following the passage of the cold front.

Across the Valley, tonight will be mostly cloudy with cooler air settling into the region. Low temperatures will fall into the upper 40s to lower 50s as northwest winds continue at around 10 mph, with occasional gusts above 20 mph.

Friday will feature a return to dry and comfortable weather. Any lingering clouds will give way to mostly sunny skies, with afternoon highs reaching the low to mid-70s. Northwest winds of 10 to 15 mph will remain breezy at times, with gusts up to around 25 mph. Friday night will be clear and cool, with temperatures in the low 50s and light west winds.

Saturday will begin with a mix of sun and clouds before the next frontal system approaches. High temperatures will climb into the upper 70s with light southwest winds. A few showers may develop late in the afternoon, but the better chance for widespread rainfall will arrive Saturday night. Periods of rain are expected overnight, with rainfall totals generally ranging from 1/2 to 3/4-inch. Overnight temperatures will settle into the lower 50s.

A cooler air mass will settle over the region for the second half of the weekend and the start of next week as high pressure builds in behind a departing weather system. Another frontal system will approach on Tuesday, followed by a secondary cold front on Wednesday, bringing additional opportunities for showers and thunderstorms.

Sunday will be cooler than recent days, with highs reaching the low 70s. Intervals of sunshine will mix with clouds as scattered showers become likely, and thunderstorms may develop during the afternoon. While not everyone will see rain, those that do could experience brief downpours, lightning, and gusty winds. Northwest winds of 5 to 10 mph, with gusts up to 20 mph, will add to the cooler feel.

Any lingering showers or thunderstorms will end during the evening, followed by partly cloudy skies overnight. Low temperatures will fall into the low 50s.

Monday will feature abundant sunshine, comfortable humidity, and afternoon highs in the upper 70s. Monday night will remain partly cloudy with lows in the low to mid-50s.

Clouds will begin to increase on Tuesday as the next system approaches. High temperatures will climb into the upper 70s to around 80 degrees, with only a slight chance of an afternoon shower. Shower chances will become more widespread Tuesday night as lows settle into the upper 50s.

On Wednesday, a cold front will move through the region, bringing scattered showers and thunderstorms throughout the day. While it will not be a washout, periods of rain and thunderstorms may interrupt outdoor activities. High temperatures will reach the mid-to-upper 70s before cooler air gradually returns behind the front. A few showers or thunderstorms may linger into Wednesday evening before diminishing overnight, with lows falling into the mid-50s.

Updated every 3-6 hours from NWS Caribou

Weather Notice: This information is based on available computer models and data and may not reflect current conditions or later forecast updates. Always visit NWS Caribou at https://www.weather.gov/car/ for the latest official watches, warnings, and advisories for northern Maine.

Credits

• Sun/Moon data from US Naval Observatory with additional information from timeanddate.com.
• NOAA Warning Banner provided by WillyWeather.com.
• Until Dec. 2026, additional Archived Weather Data from Apex Wx is at the University of Utah's MesoWest
• Apex Wx logo by Joanna Becker ©2016 (Visit Bushi and Brush Arts Dojo)

How accurate are forecasts? On average, for the first 72 hours the accuracy is 90 percent. For days 4-7 it is 70 percent. After seven days, it is 50 percent—just good for indicating trends. On social media and other similar sites, posts that show a forecast model run a week out are just for clicks and likes, and are not considered reliable. Extended forecasts are subject to change as weather patterns evolve, so should be considered guidance rather than precise predictions. Check for updated forecasts and advisories as conditions develop.