Wednesday – Friday
High pressure moves into the Atlantic this evening with winds becoming southwesterly on the backside of the ridge. This will draw more moisture over the region aloft with increasing cloudiness tonight as a cold front approaches from the west/northwest. Highs today will be in the mid-to-upper 70s across the Valley. Tonight, skies become mostly cloudy with temperatures in the upper 50s. Southwest winds gusting 15-20 mph are possible overnight.
The cold front and associated waves of low pressure slide towards the western border Thursday with partly sunny to mostly cloudy skies and a chance of afternoon showers and isolated thunderstorms. Highs around 80 are expected across the SJV. Thursday night, showers are likely with mostly cloudy skies and southwest winds shifting to the west by early Friday. Lows drop into the upper 60s Thursday night.
Friday, showers are likely with a chance of thunderstorms, which may feature heavy downpours thanks to plenty of moisture aloft. Thunderstorms for most of northern Maine are expected to be sub-severe, though isolated strong/severe storms may occur in southern portions of the County as well in central and Downeast Maine. The Weather Prediction Center has Maine at “marginal” risk for excessive rainfall Friday indicating that localized flash flooding due to rapid runoff is possible. Skies clear Friday night with showers tapering off by early Saturday as the front moves to the Downeast coast/Gulf of Maine and high pressure builds in from Québec.
Saturday – Tuesday
High pressure builds across the Valley Saturday and Sunday with mostly sunny to partly cloudy skies with highs in the upper 70s to low 80s and overnight lows in the mid-50s and low 60s.
A cold front approaches late Sunday/early Monday with a chance of showers and possibly some afternoon thunderstorms with highs in the lower 80s. A chance of showers is possible Monday night into early Tuesday with lows in the lower 60s.
The front looks to meander in Downeast Maine Tuesday producing a chance of afternoon/evening showers/thunderstorms for the SJV. Highs in the mid-to-upper 70s with lows in the mid-to-upper 50s.
Daily Forecast
Wednesday: Mostly sunny. Highs in the mid-70s. Southwest winds 5 to 10 mph.
Wednesday Night: Mostly cloudy. Not as cool with lows in the upper 50s. Southwest winds around 5 mph. Gusts up to 20 mph after midnight.
Thursday: Partly sunny. A chance of showers in the afternoon. Highs around 80. Southwest winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 50 percent.
Thursday Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the evening, then showers likely after midnight. Humid with lows in the upper 60s. Southwest winds 5 to 10 mph. Gusts up to 25 mph in the evening. Chance of rain 70 percent.
Friday: Showers likely. Humid with highs in the lower 70s. Northwest winds around 5 mph. Chance of rain 70 percent.
Friday Night: Partly cloudy with a chance of showers in the evening, then mostly clear after midnight. Cooler with lows in the lower 50s. Chance of rain 50 percent.
Saturday: Sunny. Highs in the upper 70s.
Saturday Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the mid-50s.
Sunday: Mostly sunny. Highs in the lower 80s.
Sunday Night: Partly cloudy. Lows in the lower 60s.
Monday: Mostly sunny. A chance of showers in the afternoon. Highs around 80. Chance of rain 30 percent.
Monday Night: Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s.
Tuesday: Partly sunny with a chance of showers. Highs in the mid-70s. Chance of rain 50 percent.
Tuesday Night: Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 50s. Chance of precipitation is 40 percent.
Note: Computer model precision diminishes as the week progresses. Check The County.me or the National Weather Service Caribou, ME at for weather updates with more current information for the Saint John Valley.
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.
