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7-Day Outlook: Sun. July 26 – Sat. Aug. 1, 2026

The Saint John Valley will remain under the influence of a ridge of high pressure through the first half of the week, bringing a stretch of quiet and warmer-than-normal weather. Expect mostly sunny skies each day with light winds, while temperatures remain above seasonal averages.

Today will be mostly sunny with afternoon highs reaching the low to mid-80s inland. Winds will be light and variable early, becoming southerly around 5 to 10 mph during the afternoon. Tonight will be partly cloudy with overnight lows settling into the low to mid-50s. Light southeast winds will continue. 

Monday will feature mostly sunny skies and another warm afternoon, with highs in the low-to-mid-80s. Winds will be light, becoming southeast around 5 to 10 mph. Monday night will be partly cloudy with lows in the low-to-mid-50s. Patchy fog may develop after midnight.

On Tuesday, any patchy morning fog will gradually dissipate, giving way to mostly sunny skies. High temperatures will once again reach the low-to-mid-80s. Light south winds around 5 to 10 mph will continue. Tuesday night will be mostly cloudy with lows in the mid-to-upper 50s and light southeast winds.

By late Tuesday into Wednesday, a strengthening area of low pressure over the Great Lakes will move toward the region, bringing increasing chances for rain through Thursday.

Wednesday will begin with partly sunny skies and dry conditions for most locations, although a few showers may develop during the afternoon. High temperatures will reach the upper 70s with light southeast winds around 5 mph. Rain chances will increase Wednesday night as skies become mostly cloudy, with overnight lows in the upper 50s.

The greatest likelihood of widespread rainfall will occur on Thursday as the approaching low pressure system moves closer to the region. Showers are expected to become more numerous, and scattered thunderstorms may develop during the afternoon and continue into Thursday evening. High temperatures will be in the low to mid-70s with mostly cloudy skies. Rainfall totals of o1/2 to 1-inch are expected, with the highest amounts most likely across Downeast Maine. There is about a 60% chance that many locations, especially Downeast, will receive at least 1/2-inch of rain.

Showers and a few thunderstorms may linger Thursday night into Friday as the system gradually moves away. Friday will be partly sunny with highs in the mid-70s, although scattered showers and thunderstorms remain possible through the day. Overnight lows Friday night will settle into the upper 50s under mostly cloudy skies.

By Saturday, conditions should become somewhat more favorable for sunshine, with highs returning to the upper 70s. However, enough moisture and daytime heating may still support scattered showers or thunderstorms during the afternoon and evening. Overnight lows Saturday night will be around 60° with mostly cloudy skies and a slight chance of lingering showers or thunderstorms.

Extended Outlook
Looking ahead, after a stretch of warm weather, increasing moisture and a series of disturbances will bring more clouds along with recurring chances for showers and thunderstorms through next weekend into early the following week. Highs expected in the upper 70s with lows in the mid-to-upper 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.