Apex Wx

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7-Day Outlook: Tue. July 14 – Mon. July 20, 2026

A warm front will lift north across the region today, followed by a cold front tonight. Morning clouds, patchy fog, and a few scattered showers will gradually give way to increasing sunshine, allowing temperatures to climb into the upper 80s to lower 90s. Combined with high humidity, heat index values will reach the low to upper 90s, creating dangerous heat conditions in some areas.

Attention then turns to the potential for severe thunderstorms late this afternoon through tonight, with the greatest threat occurring between sunset and midnight. An Enhanced Risk (Level 3 of 5) remains in effect for the entire region. The atmosphere is expected to become increasingly unstable during the afternoon, supporting the development of strong to severe thunderstorms. Damaging straight-line winds will be the primary hazard, with gusts exceeding 60 mph possible and isolated gusts over 70 mph in the strongest storms. Large hail up to 1 to 2 inches in diameter is also possible, especially across southern and southwestern portions of the area. Although the tornado threat remains limited, an isolated tornado cannot be ruled out, particularly with any discrete supercell thunderstorms.

South to southeast winds of around 5 to 15 mph will shift to the southwest during the afternoon, with gusts reaching 20 to 25 mph outside of thunderstorms. Storms will be capable of producing torrential rainfall, frequent lightning, and localized rainfall totals exceeding 1 inch, although average rainfall amounts will generally range from 1/10 to 1/4-inch. Thunderstorms will diminish later tonight as the cold front moves east, with skies gradually clearing overnight. Temperatures will fall into the lower 60s as winds become light west.

A much cooler and less humid air mass will arrive on Wednesday. Skies will be mostly sunny through much of the day before a few afternoon clouds develop. High temperatures will reach the upper 70s, accompanied by brisk west winds of 10 to 20 mph with gusts approaching 30 mph.

The cooler pattern will continue into Thursday as a large upper-level low remains north of the region. High temperatures will only reach the lower 70s, with partly to mostly sunny skies giving way to scattered afternoon showers and a few thunderstorms. Severe weather is not expected, although the colder air aloft may allow a few stronger showers to produce small hail. West winds of 10 to 20 mph will continue, and overnight lows will cool into the upper 40s to mid-50s by Thursday night.

High pressure will build into the region on Friday and remain in control through Saturday, bringing a stretch of pleasant midsummer weather. Friday will feature mostly sunny skies with highs in the upper 60s to lower 70s. A west wind of 10 to 15 mph, with gusts up to 25 mph, will make conditions feel comfortably cool and dry. Friday night will be partly cloudy, with lows settling into the low to mid-50s.

Saturday will remain mostly sunny and slightly warmer, with afternoon temperatures climbing into the mid-70s. Saturday night will be partly cloudy, with a slight chance of a passing shower late as the next weather system approaches from the Great Lakes. Overnight lows will once again fall into the low to mid-50s.

By Sunday, low pressure tracking east into southern Maine will bring a chance of scattered showers, especially across northern portions of the region, while intervals of sunshine should still allow temperatures to reach the mid-70s. A cold front will approach Sunday night, bringing another chance for isolated showers.

The front will move through on Monday, producing scattered showers and a few thunderstorms, particularly across the Saint John Valley. High temperatures will reach the upper 70s before cooler air gradually filters into the region. Additional disturbances rotating around a large upper-level low over Quebec will keep a chance of showers in the forecast into Tuesday.

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.