Apex Wx

via Google Translate

7-Day Outlook: Thu. July 9 – Wed. July 15, 2026

A pre-frontal trough currently located along the St. Lawrence River will move across the region today, bringing increasing heat, humidity, and the chance for scattered showers and thunderstorms. A few light showers are possible across northern areas early this morning, but most locations will remain dry through much of the day. By this afternoon, the combination of warm, humid air and daytime heating will create favorable conditions for thunderstorm development, especially from the Central Highlands into the Upper Penobscot Valley. High temperatures will reach the lower 80s under mostly cloudy skies.

As the pre-frontal trough moves south, enough daytime mixing is expected to bring wildfire smoke down to the surface across northern Aroostook County this afternoon. The smoke will gradually spread farther south overnight, leading to hazy skies and reduced air quality in some locations. Those who are sensitive to smoke should consider limiting prolonged outdoor activities.

The pre-frontal boundary will weaken this evening as a stronger cold front approaches from Canada. Scattered showers will become more widespread overnight ahead of the front, with the greatest chance for thunderstorms focused across Downeast areas early in the night. Overnight temperatures will remain mild, with lows settling into the lower 60s.

The cold front will move through the region on Friday, bringing a few lingering showers during the morning before skies gradually become mostly sunny. Another isolated thunderstorm could develop along the coast during the afternoon, depending on the timing of the front. High temperatures will again reach the lower 80s, although lower humidity will gradually arrive later in the day. At the same time, additional wildfire smoke may mix down to the surface behind the front, which could result in continued hazy conditions and locally reduced air quality.

Clearer, cooler, and more comfortable weather will arrive Friday night as high pressure builds into the region. Overnight lows will fall into the middle 50s under mostly clear skies.

The pleasant weather will continue through Saturday with abundant sunshine, lower humidity, and afternoon temperatures in the middle 70s. Saturday night will remain mostly clear and cool, with temperatures dropping into the lower 50s.

High pressure will build into the region behind the departing cold front this weekend, bringing a stretch of pleasant summer weather with comfortable humidity, seasonable temperatures, and mostly clear skies. Saturday will feature abundant sunshine with afternoon highs in the middle 70s, while clear skies and light winds will allow temperatures to fall into the lower 50s Saturday night.

By Sunday, an upper-level ridge will begin building over the area, leading to a gradual warming trend that will continue into the first part of next week. Sunshine will remain plentiful, with highs reaching the lower 80s on Sunday before climbing into the middle 80s on Monday. Overnight lows will moderate from the upper 50s Sunday night into the lower to middle 60s Monday night. Although temperatures will run about 5 to 10 degrees above average for mid-July, humidity levels are expected to remain relatively comfortable through much of the period, making for pleasant conditions despite the warmer weather.

The weather pattern will begin to change late Monday as the next trough approaches from the west. Clouds will gradually increase, and a few showers may develop Monday night. By Tuesday, there will be a chance for scattered showers and thunderstorms as the approaching system draws closer, although much of the day will still feature partial sunshine and warm temperatures in the middle 80s.

The greatest likelihood for showers and thunderstorms will occur Tuesday night as the disturbance moves into the region. Some periods of rain and embedded thunderstorms are possible before the system begins to move through. On Wednesday, a few showers and thunderstorms may linger, but coverage is expected to become more scattered as the system gradually exits the region. Temperatures will ease back into the upper 70s to around 80 degrees by Wednesday afternoon, with gradually improving conditions expected by Wednesday night.

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.