Apex Weather

St. John Valley weather for Sept. 15-21

3-Day Outlook: Wednesday – Friday

High pressure over the region today will move east tonight while a warm front lifts towards the region from the southwest. Chances for showers increase tonight with a chance for isolated thunderstorms overnight. Showers are likely with isolated thunderstorms Wednesday as a cold front crosses the SJV. Some isolated thunderstorms may be strong to severe. Showers continue into Wednesday night before tapering off after midnight. High pressure builds across the Valley Thursday with mostly sunny skies and dry conditions.

Today & Tonight

Partly cloudy early then mostly sunny with a high around 63 degrees. North-northwest winds 5-6 mph.

Tonight, partly cloudy in the evening then becoming mostly cloudy with an 80 percent chance for showers and isolated thunderstorms, mainly after midnight. Rainfall amounts around 0.25-inch expected. Low near 47 degrees with south winds 5-9 mph.

Wednesday, September 15

Cloudy with a 90 percent chance for showers and isolated afternoon thunderstorms. Some storms may be strong to severe. Rainfall totals in the 0.10 to 0.25-inch range with higher totals possible in storms. High around 65 degrees with south-southwest winds 10-12 mph.

Wednesday night, mostly cloudy with a 40 percent chance for showers tapering off overnight.  Patchy fog possible overnight. Low near 51 degrees with northwest winds 3-5 mph.

Thursday, September 16

Mostly sunny with a 5 percent chance for showers. High around 72 degrees with west winds 3-4 mph.

Thursday night, mostly clear with a 5 percent chance for showers. Low near 48 degrees with south winds 0-7 mph.

Days 4 – 7: Friday – Monday

High pressure continues to move across the Valley Friday. A cold front approaches late Friday with some showers possible by early Saturday. The cold front slowly crosses the region Saturday into Sunday with a chance for showers both days. Precipitation tapers off Sunday evening with partly cloudy skies developing as high pressure builds across New England and the Maritimes Monday based on current forecast model consensus, though some model uncertainty exists.

Friday, September 17

Mostly sunny in the morning then becoming partly cloudy in the afternoon with a 10 percent chance for showers. High around 77 degrees with south winds 8-14 mph.

Friday night, partly cloudy with a 30 percent chance for showers. Low near 60 degrees with southwest winds 0-7 mph.

Saturday, September 18

Partly sunny with a 40 percent chance for showers. High around 75 degrees with west winds 0-7 mph.

Saturday night, partly cloudy with a 40 percent chance for showers. Low near 52 degrees with northwest  winds 0-7 mph.

Sunday, September 19

Partly cloudy with a 30 percent chance for showers. High around 72 degrees with west winds 0-7 mph.

Sunday night, partly cloudy with a 20 percent chance for showers. Low near 51 degrees with west winds 0-7 mph.

Monday, September 20

Partly cloudy with a 20 percent chance for showers in the morning. High around 73 degrees with west winds 0-7 mph.

Monday night, partly cloudy with a 10 percent chance for showers. Low near 54 degrees with northwest winds 0-7 mph.

8 – 14 Day Trends: Tue. Sep. 21 –  Mon. Sep. 27

Above normal temperatures / Near 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.

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