St. John Valley weather, May 18-24, 2022
3-day Outlook: Wednesday-Friday
Low pressure will track away from the Maritimes today as high pressure builds into the SJV on gusty northwest winds.
Mostly clear to partly cloudy skies with light winds will allow temperatures to drop into the 30s across northern Maine tonight.
An upper trough will approach from the west Thursday with a surface low developing over southern New England and tracking across the Gulf of Maine. Clouds will increase Thursday morning with a chance for showers by the afternoon. Showers are likely in the evening with a chance for showers heading into the overnight hours. Rainfall will taper off after midnight as the low pressure area tracking east into the Maritimes.
Partly sunny skies are expected Friday with a warm front lifting across the region later Friday bringing increasing chances for showers. Scattered showers are expected Friday night into Saturday as the warm front moves north of the Valley followed by an occluded front late Friday night into early Saturday.
Today and Tonight
Mostly cloudy in the morning with a 20 percent chance for isolated showers. Becoming mostly sunny and breezy in the afternoon. High around 56 degrees. West wind 15-20 mph gusting 25-30 mph.
Tonight, mostly clear with a low near 35 degrees. Northwest wind around 5-10 mph in the evening becoming west-southwest 3-4 mph overnight.
Thursday, May 19
Partly sunny in the morning then mostly cloudy in the afternoon with a 70 percent chance for afternoon showers. Rainfall totals around 0.10-inch. High around 64 degrees. South wind 8-11 mph.
Thursday night, mostly cloudy with an 80 percent chance for showers ending after midnight. Low near 43 degrees. South wind 4-6 mph in the evening becoming west overnight 2-3 mph.
Friday, May 20
Partly sunny with a 10 percent chance for isolated afternoon showers. High around 67 degrees. West-southwest wind 3-5 mph becoming south 6-9 mph in the afternoon.
Friday night, partly cloudy with a 50 percent chance for scattered showers. Low near 54 degrees. South wind 8-14 mph.
4- to 7-day Outlook: Saturday-Tuesday
High pressure builds in Saturday as low pressure lifts to the northeast Saturday. Partly sunny to partly cloudy skies with a chance for scattered showers. Partly cloudy skies are expected Saturday night and Sunday as another low pressure area tracks to the northwest from the Great Lakes.
Some showers are possible Saturday night as the associated warm front lifts across the SJV followed by a cold front Sunday. Showers and scattered thunderstorms are possible Sunday afternoon and evening as the front approaches and crosses the region with some stronger thunderstorms possible across northern and central portions of the area based on current model indications.
Showers and thunderstorms are possible Sunday night into early Monday with morning showers tapering off by early afternoon Monday as high pressure builds into the region with partly cloudy skies. Mostly clear skies develop Monday night into Tuesday morning with partly cloudy skies overspreading the Valley by the afternoon.
Saturday, May 21
Partly sunny to partly cloudy with a 30 percent chance for scattered showers and possibly some thunderstorms. High around 83 degrees. Southwest wind 8-14 mph.
Saturday night, partly cloudy with a 30 percent chance for scattered showers. Low near 56 degrees. Southwest wind 0-7 mph.
Sunday, May 22
Partly sunny with a 60 percent chance for showers and scattered afternoon thunderstorms. High around 76 degrees. Southwest wind 0-7 mph.
Sunday night, partly cloudy with a 50 percent chance for scattered showers and thunderstorms. Low around 47 degrees. Northwest wind 0-7 mph.
Monday, May 23
Partly cloudy with a 20 percent chance for isolated showers, mainly in the morning. High around 63 degrees. Northwest wind 8-14 mph.
Monday night, partly cloudy with a 5 percent chance for isolated showers. Low near 40 degrees. Northwest wind 0-7 mph.
Tuesday, May 24
Mostly sunny in the morning then partly cloudy in the afternoon with a 5 percent chance for isolated showers. High around 68 degrees. West wind 0-7 mph.
Tuesday night, partly cloudy with a 20 percent chance for isolated showers. Low near 47 degrees. South wind 0-7 mph.
8- to 14-day Trends: Wednesday, May 25-Tuesday, May 31
Above normal temperatures / Above 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.