Apex Weather

St. John Valley weather for Sept. 25-Oct. 1, 2019

ST. JOHN VALLEY, Maine — Mostly cloudy skies will predominate Wednesday as a low pressure system slowly lifts to the northeast in the Canadian Maritimes.

Breaks in the clouds will be more prominent in the afternoon and evening with mostly cloudy skies overnight Wednesday despite a ridge of high pressure building across the region. Clouds will increase again Thursday morning as another frontal system approaches and crosses the Valley Thursday. The region will be in the right rear quarter of a strong jet stream aloft which may produce some locally heavy downpours at times. 

Rainfall will continue into the overnight hours before tapering off after midnight Thursday night. High pressure over the Middle Atlantic will build across the SJV with partly cloudy skies Friday into Friday night. Clouds increase Saturday as a cold front slides through with showers likely in the afternoon. Skies become partly cloudy Saturday night as high pressure north of the Great Lakes builds east into the Valley through Monday evening with partly cloudy to mostly clear skies. A warm front brings increasing chances for precipitation Monday evening and a slight chance for showers as it crosses the Valley Tuesday.

Daily Weather Summary

Wednesday, September 25
Cloudy/mostly cloudy skies in the morning with a slight chance for showers followed by partly sunny skies in the afternoon and early evening hours. High in the middle 50s with north/northwest winds 5 to 10 mph. Wednesday night, mostly cloudy with a 20 percent chance for showers after midnight. Low in the lower 40s with winds become southeasterly near 5 mph.

Thursday, September 26
Cloudy with a 100 percent chance for showers with around 1/2 inch or so rainfall with locally higher totals possible in some locations. High in the middle 60s with south/southwest winds near 5 mph. Thursday night, mostly cloudy early then becoming partly cloudy after midnight with a 60 percent chance for showers with rainfall totals between 1/100 and 1/10 inch expected. Low in the middle 40s with west winds 5 to 10 mph

Friday, September 27
Partly cloudy with a high near 60. West winds 5 to 10 mph. Friday night, partly cloudy with a 40 percent chance for showers after midnight. Low in the lower 40s with south wind 0 to 5 mph.

Saturday, September 28
Partly cloudy in the morning then mostly cloudy in the afternoon with a 60 percent chance fro showers, especially in the afternoon. High in the low 60s with southwest winds 0 to 5 mph. Saturday night, partly cloudy with a 20 percent chance for showers. Low in the lower 40s with northwest winds 0 to 5 mph.

Sunday, September 29
Partly cloudy in the morning then mostly clear in the afternoon and evening. High in the middle 50s with northwest winds 8 to 14 mph. Sunday night, mostly clear with a low in the middle 30s. Northwest winds 0 to 5 mph.

Monday, September 30
Partly cloudy with a high in the middle 50s. Northwest winds 0 to 5 mph. Monday night, partly cloudy with a 30 percent chance for showers after midnight. Low in the upper 30s with northeast winds 0 to 5 mph.

Tuesday, October 1
Partly sunny with a 20 percent chance for showers. High in the middle 50s with southeast winds 0 to 5 mph. Tuesday night, mostly cloudy with a 40 percent chance for showers. Low in the middle 40s with north/northwest 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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