Apex Weather

St. John Valley weather for Aug. 21-27, 2019

ST. JOHN VALLEY, Maine — High pressure will move east away from the Valley Wednesday morning while a low pressure area over Lake Huron will move into Québec lifting a warm front over the region this afternoon and evening producing a chance for showers and thunderstorms, especially later in the day.

The strengthening low pressure area will track towards Labrador tonight drawing a cold front east towards the SJV with a chance for showers and thunderstorms overnight with showers and a chance for thunderstorms, a few of which could be strong/severe overnight into Thursday morning. 

Skies becoming partly cloudy by Thursday afternoon with lower humidity levels and declining chances for precipitation, though a slight chance for afternoon showers and thunderstorms remains Thursday afternoon across the Valley. Mostly clear skies develop Thursday night as a cooler, drier air mass builds in from central Canada. A weak cold front dropping down from the north brings increased cloudiness and a chance for showers later Friday morning into the afternoon. Clouds decrease Saturday as high pressure builds east into the SJV. High pressure centers over the Valley Sunday then moves into the Maritimes Monday and Tuesday with partly cloudy to mostly clear skies expected for the period.

Daily Weather Summary 

Wednesday, August 21
Increasing clouds with a 50 percent chance for showers and thunderstorms in the afternoon and evening. Rainfall totals less than 1/10 inch expected through the evening hours. High in the low 80s with south winds 5 to 10 mph possibly gusting around 10 to 15 mph this afternoon. Wednesday night, mostly cloudy and muggy with a 60 percent chance for showers and thunderstorms with isolated strong/severe thunderstorms possible. Rainfall amounts around 1/4 inch are anticipated overnight with higher totals in any thunderstorms. Low in the middle 60s with south winds near 5 mph. Gusty winds and small hail may occur in some thunderstorms.

Thursday, August 22
Becoming partly cloudy and less muggy with a 40 percent chance for showers, mainly in the morning with a slight chance for afternoon/evening showers and thunderstorms. Precipitation totals less than 1/10 inch expected. High in the upper 70s with winds becomeing west/southwest winds 10 to 15 mph with gusts to 25 mph possible in the afternoon, especially across higher elevations. Thursday night, mostly clear with a low in the lower 50s and west/southwest wind dropping to around 5 mph.

Friday, August 23
Partly cloudy early then mostly cloudy with a 30 percent chance for mainly afternoon showers. Less than 1/10 inch precipitation anticipated. High in the mid-60s with west winds 10 to 15 mph. Friday night, partly clear with a slight chance for showers. Low in the lower 50s with northwest winds 0 to 5 mph.

Saturday, August 24
Partly cloudy and breezy with a high in the upper 60s. North winds in the 10 to 15 mph range. Saturday night, mostly clear with a low in the middle 40s and north winds 0 to 5 mph.

Sunday, August 25
Mostly clear with a high in the lower 70s. North/northeast winds near calm. Sunday night, mostly clear with a low in the lower 50s. South winds 0 to 5 mph.

Monday, August 26
Mostly clear with a high in the middle 70s. South winds 0 to 5 mph. Monday night, mostly clear with a low in the lower 50s. South winds 0 to 5 mph.

Tuesday, August 27
Mostly clear with a high in the mid-70s. South winds 0 to 5 mph. Tuesday night, mostly clear with a low in the lower 50s. South winds 0 to 5 mph.

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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