St. John Valley weather for June 27-July 3, 2018
A high-pressure ridge will bring mostly sunny skies and warm temperatures to the Valley Wednesday. Low pressure tracking from the Great Lakes northwest of the Valley will pull a frontal boundary across the region Thursday with a chance for rain, mainly in the afternoon and evening, that tapers to showers overnight. High pressure will begin to build in Friday, though a chance for evening showers and thunderstorms persists thanks to a secondary front crossing the Valley later in the day.
Partly cloudy/partly sunny skies are expected over the weekend as a very warm and humid air mass takes hold of the Valley Sunday and Monday with daytime temperature near 90°F and dew points in the mid- to upper 60s creating muggy conditions, along with excessive heat advisories possible. Showers and scattered thunderstorms are possible Monday evening and Tuesday as a cold front approaches.
Daily Weather Summary
Wednesday, June 27: High: 82. Low: 58.
Day: Mostly sunny and warm with west winds 5 to 10 mph. Night: Partly cloudy with increasing clouds after midnight. South winds around 5 mph.
Thursday, June 28: High: 67. Low: 58.
Day: Cloudy and cool with an 80 percent chance for rain, possibly heavy at times, especially in the afternoon/evening. Rainfall totals between one-quarter and one-half inch possible. South winds 5 to 10 mph Night: Cloudy with a 90 percent chance for showers. Light south winds.
Friday, June 29: High: 81. Low: 55.
Day: Rain tapering to showers in the morning then partly sunny/partly cloudy in the afternoon. Slight chance for afternoon/evening showers/thunderstorms. Light west winds. Night: Partly cloudy to mostly clear with light west winds.
Saturday, June 30: High: 83. Low: 62.
Day: Partly cloudy and warm with a slight chance for afternoon/evening showers. Light southwest winds. Night: Partly cloudy to partly clear with a slight chance for showers. Light south winds.
Sunday, July 1: High: 90. Low: 68.
Day: Partly sunny/partly cloudy, hot, and humid with a slight chance for afternoon/evening showers/thunderstorms. Light southwest winds. Night: Partly cloudy and humid with a 30 percent chance for showers and thunderstorms. Light southwest winds.
Monday, July 2: High: 91. Low: 68.
Day: Partly cloudy, hot, and humid with a 40 percent chance for showers and afternoon/evening thunderstorms. Light southwest winds. Night: Partly cloudy and humid with a 50 percent chance for showers/thunderstorms. Light to breezy southwest winds.
Tuesday, July 3: High: 78. Low: 63.
Day: Mostly cloudy with a 50 percent chance for scattered showers/thunderstorms. Light southwest winds. Night: Mostly cloudy early with a 60 percent chance for showers/thunderstorms. Then mostly cloudy after midnight with a 20 percent chance for showers. Light southwest winds.
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.