St. John Valley weather, Aug. 12-18, 2020
Short-Term Outlook: Wednesday – Friday
A cold front is moving across the Valley this Wednesday morning and will progress to the east/southeast as the day progresses. Scattered showers and isolated thunderstorms will remain possible into the afternoon hours before precipitation winds down.
Dew points will drop back into the 50s by tonight creating less muggy conditions in the Valley. Overcast skies this morning will become partly cloudy this afternoon then mostly clear overnight as high pressure builds in from the northwest with cooler, drier air. Thursday and Friday will feature mostly sunny days and clear nights with daytime highs above normal Thursday and slightly above normal Friday with overnight lows close to seasonal norms.
Today & Tonight
Decreasing clouds this morning with a chance for showers and isolated thunderstorms then becoming partly cloudy with a chance for showers and isolated thunderstorms in the afternoon. Chance for precipitation 50 percent. Between 1/100 and 1/10-inch rain possible. High near 85 degrees F with west winds 5 to 10 mph with gusts to around 15 mph possible.
Overnight, partly cloudy in the evening then mostly clear with a 5 percent chance precipitation. Low around 57 degrees F with west winds 0 to 5 mph becoming northwest after midnight.
Thursday, August 13
Mostly sunny with a high around 82 degrees F. 5 percent chance for precipitation. Less humid with northwest winds 5 to 10 mph with gusts to 15 mph possible.
Thursday night, mostly clear with a near 55 degrees F. Chance for precipitation 5 percent. Northwest winds 0 to 5 mph.
Friday, August 14
Partly cloudy in the morning then mostly sunny with a high around 77 degrees F. Chance precipitation 10 percent. North winds 5 to 10 mph with gusts to around 15 mph.
Friday night, mostly clear with a low near 54 degrees F. North/northeast winds 0 to 5 mph.
Medium-Range: Saturday – Tuesday
High pressure dominates the Valley’s weather through early Monday. A cold front approaches with increasing chances for showers and afternoon thunderstorms Monday and showers as it crosses the area Tuesday. High pressure over the Great Lakes builds east into the region Tuesday night.
Saturday, August 15 / Acadia Day
Partly cloudy with a high in the mid-70s. Chance for precipitation 10 percent. East/northeast winds 0 to 5 mph.
Saturday night, mostly clear with a low in the lower 50s. Chance for precipitation 5 percent. East/southeast winds 0 to 5 mph.
Sunday, August 16
Mostly clear in the morning then partly cloudy with a high in the upper 70s. Southeast winds 0 to 5 mph.
Sunday night, partly cloudy with a 5 percent chance for precipitation. Low in the middle 50s with south/southeast winds 0 to 5 mph.
Monday, August 17
Partly sunny with a 20 percent chance for afternoon showers and thunderstorms. High in the low 80s with south/southwest winds 5 to 10 mph.
Monday night, partly cloudy with a 40 percent chance for showers. Low in the upper 50s with south/southwest winds 0 to 5 mph.
Tuesday, August 18
Partly sunny with a 40 percent chance for showers. High in the mid-70s with west winds 5 to 10 mph.
Tuesday night, considerable cloudiness with a 30 percent cahnce for showers. Low in the upper 50s with west/northwest winds 0 to 5 mph.
Regional Long-Range Trends: Wed. Aug. 19 – Tue. Aug. 25
Above normal temperatures and slightly 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.