Apex Weather

St. John Valley weather for March 17-23, 2021

Wednesday – Friday

Today will start partly cloudy and mild after the weekend cold snap as return flow around high pressure moving to the southeast into the Atlantic draws warmer air into the Valley. High clouds ahead of an approaching warm front will produce partly sunny  skies this afternoon.

Clouds begin to increase tonight with mostly cloudy skies expected Thursday as a trough approaches from the west and moves through. Some snow showers are expected Thursday morning changing to rain showers in the afternoon as temperatures rise above freezing once more. Precipitation totals are expected to be light with an inch or less of snow for most Valley locations. Partly cloudy skies develop Thursday night behind a strong cold front that moves through late in the day. Notably colder air will build in behind the front for Friday and Friday night on breezy north/northwest winds.

Wednesday, March 17 

Partly cloudy in the morning then partly sunny in the afternoon with a high near 44 degrees. West/ winds 0 to 5 mph become southwest in the afternoon.

Wednesday night, partly cloudy with a low around 29 degrees and a chance for snow showers after midnight. Probability of precipitation 40 percent with around 1-inch or less snowfall accumulation. Southwest winds 0 to 5 mph.

Thursday, March 18 

Mostly cloudy with a 40 percent chance for morning snow showers changing to rain showers by midday. Precipitation totals less than 1/10-inch. High near 42 degrees with west/northwest winds 5 to 10 mph.

Thursday night, partly cloudy with a 10 percent chance for rain showers, mainly in the evening. Low around 7 percent with winds becoming north 5 to 10 mph. Wind chill values around -5 to -10 degrees overnight.

Friday, March 19

Becoming mostly sunny with a 5 percent chance for precipitation. High around 23 degrees with north winds 10 to 15 mph. Wind chill values 0 to -5 degrees in the morning then 5 to 10 degrees in the afternoon.

Friday night,  mostly clear with a 5 percent chance for precipitation. Low near 7 percent with northwest winds dropping to around 5 mph.

Medium Range Outlook: Saturday- Tuesday
High pressure will slide over the Middle Atlantic Saturday and then move east into the Atlantic Sunday with partly cloudy skies, warming temperatures, and dry conditions through early next week. 

Saturday, March 20 / Spring Equinox at 5:37 AM ET

Mostly sunny with a high near 42 degrees. West winds 5 to 10 mph.

Saturday night, mostly clear with a low around 21 degrees. West winds around 5 mph.

Sunday, March 21

Mostly sunny with a high around 51 degrees and west winds 5 to 10 mph.

Sunday night, mostly clear with a low near 27 degrees and west winds around 5 mph.

Monday, March 22

Mostly sunny with a high near 56 degrees. West/southwest winds 5 to 10 mph.

Monday night, mostly clear in the evening then becoming partly cloudy with a low around 31 degrees. West/southwest winds around 5 mph.

Tuesday, March 23

Partly cloudy with a 5 percent chance for precipitation. High near 54 degrees with west/northwest winds 5 to 10 mph.

Tuesday night, partly cloudy with a 10 percent chance for precipitation. Low around 25 degrees with north/northwest winds around 5 mph.

Long-Range Trends Wed. Mar. 24 –  Tue. Mar. 30

Above normal temperatures  /  Above 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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