Apex Weather

St. John Valley weather for Aug. 17-23, 2022

3-day outlook: Wednesday-Friday

A low pressure area moving into the Gulf of Maine today will track across the eastern portion of the state Thursday then move northeast into the Maritimes Friday.

There is plenty of moisture associated with this system such that locally heavy rainfall in the 1- to 2-inch range is possible from this system. Showers are expected to arrive in northern Maine this afternoon with rain likely tonight and tomorrow along with a chance for isolated thunderstorms over the course of the day Thursday.

Rain will taper to showers Thursday night before ending early Friday. Clouds will diminish Friday as high pressure builds into the Valley with mostly clear skies overnight into Saturday.

Today and tonight

Increasing clouds in the morning then cloudy in the afternoon with a 60 percent chance for showers in the afternoon. Between 0.10 and 0.25-inch rainfall expected. High around 75 degrees. Northeast wind 5-10 mph.

Tonight, cloudy with a 70 percent chance for rain. Rainfall totals in the 0.25 to 0.50-inch range expected. Low near 58 degrees. Northeast wind 6-8 mph.

Thursday, Aug. 18

Cloudy with rain likely. 90 percent for precipitation. Rainfall totals in the 0.0.50 to 0.75-inch range expected. High around 68 degrees. Northeast wind 5-10 mph.

Thursday night, cloudy with a 70 percent chance for rain tapering to showers after midnight. Rainfall totals in the 0.10 to 0.25-inch range expected. Low near 57 degrees. Northwest wind 3-4 mph. 

Friday, Aug. 19

Decreasing clouds with partly cloudy skies in the afternoon. 20 percent chance for showers, mainly in the morning. High around 75 degrees. Northwest wind 5-10 mph becoming west 4-8 mph.

Friday night, mostly clear with a 10 percent chance for showers. Low near 56 degrees. West wind 0-7 mph.

4- to 7-day outlook: Saturday-Tuesday

High pressure brings mostly sunny skies Saturday and partly cloudy skies Saturday night. Partly cloudy skies Sunday will feature a chance for afternoon showers and thunderstorms as an upper-trough approaches. Afternoon showers and thunderstorms are possible once again Monday followed by showers Tuesday as a cold front approaches from the west. Showers are possible Tuesday night into Wednesday.

Saturday, Aug. 20

Mostly sunny with a 5 percent chance for showers. High around 82 degrees. West wind 0-7 mph.

Saturday night, partly cloudy with a 10 percent chance for showers. Low near 58 degrees. Southwest wind 0-7 mph.

Sunday, Aug. 21

Partly cloudy with a 30 percent chance for afternoon showers and thunderstorms. High around 82 degrees. West wind 0-7 mph.

Sunday night, partly cloudy with a 20 percent chance for showers. Low near 59 degrees. Southwest wind 0-7 mph.

Monday, Aug. 22

Partly cloudy in the morning then partly sunny in the afternoon with a 30 percent chance for afternoon showers and thunderstorms. High around 80 degrees. South wind 0-7 mph.

Monday night, partly cloudy with a 20 percent chance for showers. Low near 60 degrees. South wind 0-7 mph.

Tuesday, Aug. 23

Partly sunny with a 40 percent chance for showers. High around 79 degrees. Southwest wind 0-7 mph.

Tuesday night, partly cloudy win a 30 percent chance for showers. Low near 60 degrees. Northwest wind 0-7 mph.

8- to 14-day trends: Wednesday, Aug. 24-Tuesday, Aug. 30

Above normal temperatures / Near 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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