St. John Valley weather for June 2-8, 2021
Short-Term Outlook: Wednesday – Friday
Mostly clear skies will become partly cloudy skies this morning as a cold front drops down to the Saint Lawrence River Valley and stalls out. Weak disturbances circulating around to top of the ridge of high pressure off the US East Coast may produce a chance for very isolated showers across the Valley today.
Partly cloudy skies continue this evening with a slight chance for showers, mainly after midnight tonight, as a weak warm front lifts northwards. Winds become southerly as the high pressure off the East Coast shifts further into the Atlantic allowing warmer, moister air to flow into the Valley.
Chances for showers increase Thursday morning as an area of low pressure tracks from the southern Great Lakes towards Maine. High-resolution computer models indicate showers overspreading the SJV in the late morning period and continuing through the afternoon into the evening period. Showers continue overnight into Friday.
A chance for showers continues Friday morning with showers likely along with a chance for scattered thunderstorms Friday afternoon as a cold front approaches from the west. Precipitation ends after the front moves through Friday afternoon/evening with partly cloudy skies developing overnight into Saturday morning.
Wednesday, June 2
Mostly sunny to partly cloudy with a slight chance for isolated afternoon showers. High around 76 degrees with west winds 5 to 10 mph.
Wednesday night, becoming partly cloudy with a 20 percent chance for showers after midnight. Low near 52 degrees with southwest to south winds 0 to 5 mph.
Thursday, June 3
Increasingly cloudy in the morning then cloudy in the afternoon with a 90 percent chance for afternoon showers. Rainfall totals between 1/10 and 1/4-inch. High near 72 degrees with south winds 5 to 10 mph.
Thursday night, cloudy with an 80 percent chance for showers. Rainfall totals around 1/10-inch expected. Some patchy fog possible. Low around 57 degrees with south winds becoming southwest after midnight 0 to 5 mph.
Friday, June 4
Mostly cloudy to overcast with a 60 percent chance for showers and a chance for scattered to isolated afternoon thunderstorms. High around 77 degrees with west winds 5 to 10 mph.
Friday night, partly cloudy with a 10 percent chance for showers. Low near 54 degrees with west winds 0 to 5 mph.
Medium-Range Outlook: Saturday – Tuesday
Partly cloudy skies Saturday morning become increasingly cloudy in the afternoon as another cold front approaches from the northwest. The front will increase instability with a chance for mainly afternoon showers and some isolated thunderstorms. A chance for showers and scattered thunderstorms continues Saturday night into Sunday morning.
Sunday will have a mix of clouds and sun across the SJV with the stalled front lifting back across the region as a warm front. Daytime heating will provide a chance for scattered showers across the area which wane in the evening.
A large high-pressure ridge will set up over the eastern US by the end of the period. This ridge will bring warmer and more humid air to the Valley with daytime highs approaching daily records early next week (Fort Kent reached 91 degrees on June 7 in 1976 and 84 degrees on June 8, 1941)). A slight chance for afternoon showers and isolated thunderstorms fired up by daytime heating are expected.
Saturday, June 5
Partly cloudy in the morning then increasingly cloudy in the afternoon with a 60 percent chance for showers and isolated afternoon thunderstorms. High near 82 degrees with southwest winds 10 to 15 mph.
Saturday night, cloudy with a 60 percent chance for showers and scattered thunderstorms. Low around 62 degrees with west winds 5 to 10 mph.
Sunday, June 6
A mix of clouds and sun in the morning then partly cloudy with a 20 percent chance for showers and isolated thunderstorms, mainly in the morning. High around 82 degrees with northwest winds 5 to 10 mph.
Sunday night, partly cloudy with a 10 percent chance for showers. Low around 61 degrees with southwest winds 0 to 5 mph.
Monday, June 7
Partly cloudy with a 20 percent chance for isolated afternoon showers and thunderstorms. Hot and more humid with a high near 90 degrees. West winds 10 to 15 mph.
Monday night, mostly clear with a low around 64 degrees. 20 percent chance for showers. Northwest winds 5 to 10 mph.
Tuesday, June 8
Partly cloudy to mostly sunny with a 20 percent chance for isolated afternoon showers. High around 82 degrees with northwest winds 5 to 10 mph.
Tuesday night, partly cloudy with a 10 percent chance for showers. Low around 60 degrees with northwest winds 0 to 5 mph.
Long-Range Trends: Wed. June 10 – Tue. June 15
Above 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.