St. John Valley weather for April 19-25, 2023

3-Day Outlook: Wednesday, April 19-Friday, April 21

Mostly cloudy skies are anticipated today with a slight chance for morning snow showers then rain showers, mainly in the afternoon. Today’s highs range from the lower 40s in the North Woods/Allagash to the mid-40s east. Tonight, high pressure builds in with partly cloudy skies overspreading the Valley. Lows range from mid-20s west to around 30 east across the County. 

Thursday features partly cloudy skies with daytime highs reaching the mid-40s west to near 50 east across northern Maine. Partly cloudy skies Thursday evening give way to mostly clear skies overnight as high pressure continues to build across the region. Overnight lows are expected in the middle-to-upper 20s across the Crown.

Friday, mostly sunny skies in the morning give way to partly sunny skies in the afternoon as high pressure moves east and an upper-trough approaches from the west. However, blocking in the Atlantic will slow the eastward progression of the trough for much of the weekend. Partly cloudy skies with isolated showers are possible Friday night into Saturday.

Hydrology: The National Weather Service/Caribou hazardous weather outlook states that rainfall in combination with increased snowmelt will cause rivers and streams to rise to near bankfull or just above through Wednesday night. Currently, the only expected impacts are flooding of low-lying farm fields. No hazardous weather is expected Thursday through Tuesday at this time.

Daily Summary

Today: Showers likely, mainly after 2 p.m. Mostly cloudy, with a high near 45. Southwest wind around 9 mph. Chance of precipitation is 60 percent. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered rain and snow showers, mainly before 9 p.m. Partly cloudy, with a low around 29. Northwest wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30 percent.

Thursday: Mostly sunny, with a high near 47. Northwest wind around 11 mph, with gusts as high as 22 mph.

Thursday Night: Partly cloudy, with a low around 27. Northwest wind 3 to 8 mph.

Friday: Mostly sunny, with a high near 54. Light and variable wind becoming east around 5 mph in the afternoon.

Friday Night: A slight chance of showers. Mostly cloudy, with a low around 35. Southeast wind 5 to 9 mph. Chance of precipitation is 20 percent.

4- to 7-Day Outlook: Saturday, April 22-Tuesday, April 25

Blocking pattern with high pressure east and a trough to the west will bring mostly cloudy skies and a slight chance for showers across the Valley Saturday. Mostly cloudy skies Saturday night become partly sunny Sunday with increasing clouds in the afternoon as high pressure moves further east and a disturbance approaches from the west bringing increasing chances for showers Sunday afternoon and evening. The upper-trough looks to close off with a cut-off low drifting across the region Monday and Tuesday with a chance for showers across the area through the period.

Daily Summary

Saturday: A slight chance of showers before 9 a.m. Mostly cloudy, with a high near 58. Southeast wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 20 percent.

Saturday Night: Mostly cloudy, with a low around 38.

Sunday: A slight chance of showers after 3 p.m. Partly sunny, with a high near 62. Chance of precipitation is 20 percent.

Sunday Night: A chance of showers, mainly after 8 p.m. Mostly cloudy, with a low around 39. Chance of precipitation is 40 percent.

Monday: A chance of showers. Mostly cloudy, with a high near 57. Chance of precipitation is 50 percent.

Monday Night: A chance of showers. Mostly cloudy, with a low around 37. Chance of precipitation is 50 percent.

Tuesday: A chance of showers. Partly sunny, with a high near 56. Chance of precipitation is 40 percent.

8- to 14-Day Trends: Wednesday, April 26-Tuesday, May 2

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.