Apex Weather

St. John Valley weather for July 21-27, 2021

Short-Term Outlook: Wednesday –  Friday

An area of low pressure will track across west-central and Downeast Maine today while a trough axis associated with the low tracks across the Valley today.

A 500-millibar upper-level trough of low pressure will slowly shift east over the next several days with heat-driven rain showers and a slight chance for isolated afternoon thunderstorms across the SJV Thursday and Friday.

Today & Tonight

Cloudy with rain likely through the afternoon. Rainfall totals between 0.75 and 1.00-inch possible. Chance for precipitation 80 percent. High around 63 degrees with north-northeast winds 5 to 10 mph.

Tonight, mostly cloudy with a 20 percent chance for isolated showers. Fog/patchy fog possible. Low around 51 degrees with north-northwest winds 0 to 5 mph. 

Thursday, July 22

Partly cloudy with a 50 percent chance for showers and a chance for isolated afternoon thunderstorms. Rainfall totals less than 0.10-inch. High around 72 degrees with northwest winds 5-10 mph.

Thursday night, partly cloudy with a 20 percent chance for isolated showers. Low near 51 degrees with west winds 0 to 5 mph.

Friday, July 23

Partly sunny with a 50 percent chance for showers and isolated afternoon thunderstorms. Rainfall totals between 0.01 and 0.09-inch. High around 71 degrees with north-northwest winds 5-10 mph.

Friday night, partly cloudy with a 20 percent chance for showers. Low around 51 degrees with northwest winds 0 to 5 mph.
Medium-Range Outlook: Saturday – Tuesday

High pressure will build into the Valley Saturday with mostly sunny skies in the afternoon and evening. A warm front lifts towards the region Sunday with showers increasingly likely in the afternoon and some isolated thunderstorms overnight into Monday. A cold front will move through Monday into Tuesday with showers and isolated afternoon thunderstorms. Tuesday’s weather behind the front will feature partly cloudy skies with a chance for isolated afternoon showers.

Saturday, July 24

Mostly sunny with a 10 percent chance for showers. High around 77 degrees with northwest winds 5 to 10 mph.

Saturday night, mostly clear with a 5 percent chance for showers. Low near 52 degrees with south winds 0 to 7 mph.

Sunday, July 25

Partly cloudy early then partly sunny with a 60 percent chance for showers, mainly in the afternoon. High around 77 degrees with south winds 5-10 mph.

Sunday night, mostly cloudy with a 50 percent chance for showers and a chance for isolated thunderstorms. Low near 58 degrees with south winds 0-5 mph.

Monday, July 26

Partly sunny with a 50 percent chance for showers and a chance for isolated afternoon thunderstorms. High near 78 degrees with west winds 5 to 10 mph.

Monday night, partly cloudy with a 20 percent chance for isolated showers and thunderstorms. Low near 54 degrees with northwest winds 0-5 mph.

Tuesday, July 27

Partly cloudy with a 20 percent chance for isolated afternoon showers. High around 78 degrees with northwest winds 5-10 mph.

Tuesday night, partly cloudy with a 20 percent chance for showers. Low near 53 degrees with west winds southwest winds 0-5 mph.

Long-Range Trends: Wed. July 28 –  Tue. Aug. 3
Near normal temperatures   / Below normal precipitation

Note: Computer model precision diminishes the further into the week the forecast projects. Check the Fiddlehead Focus for weather updates with more current information.

The Week Ahead is the work of UMFK Professor Joseph E. Becker based on personal weather station data, various computer forecast models, and information that the National Weather Service, NOAA, and other weather resources provide.

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