St. John Valley weather for Sept. 29-Oct. 5, 2021
Three-day outlook: Wednesday – Friday
An upper-level low will drop down from the north-northwest today and remain across the region Thursday and Friday with intermittent showers, periods of rain, plenty of clouds, and daytime highs about 10 degrees cooler than normal (about 60 degrees) for this time of year.
The highest peaks of Katahdin may even see some light snowfall tomorrow into tomorrow night.
Today and tonight/Wednesday, Sept. 29
Mostly cloudy with a 40 percent chance for showers. Rainfall totals less than 0.05-inch expected. High around 55 degrees with north winds at 5 mph.
Tonight, mostly cloudy with a 50 percent chance for showers. Less than 0.05-inch precipitation expected. Low near 41 degrees with north winds 3-4 mph.
Thursday, Sept. 30
Cloudy with an 80 percent chance for rain. Rainfall totals between 0.10 and 0.25-inch expected. High around 53 degrees with north winds near 10 mph.
Thursday night, cloudy with an 80 percent chance for rain. Rainfall totals in the 0.10-inch range. Low near 41 degrees with northwest winds 4-5 mph.
Friday, Oct. 1
Cloudy with a 70 percent chance for showers. Rainfall amounts between 0.01 and 0.09-inch expected. High around 48 degrees with northwest winds 5-9 mph.
Friday night, cloudy with a 60 percent chance for showers. Low near 41 degrees with northwest winds 0-7 mph.
Days 4 – 7: Saturday – Tuesday
The upper-level low will slowly drift east through the weekend. Considerable cloudiness is expected Saturday with morning showers tapering off in frequency during the afternoon. Showers linger Saturday night and Sunday with clouds diminishing over the course of the day Sunday.
Some forecast model uncertainty for the late weekend: according to the American GFS forecast mode, partly cloudy skies develop Sunday night with high pressure expected to build across the region Monday and Tuesday. The Canadian model shows a low pressure area moving in from the west with a chance for precipitation across the Valley Sunday into Sunday night with high pressure arriving Monday night into Tuesday. However, temperatures are expected to moderate to near normal for early October by Monday/Tuesday.
Saturday, Oct. 2
Cloudy in the morning with partly cloudy skies developing in the afternoon. 30 percent chance for showers with less than 0.05-inch anticipated. High around 54 degrees with north winds 8-14 mph.
Saturday night, partly cloudy with a 20 percent chance for showers. Low near 38 degrees with north winds 0-7 mph.
Sunday, Oct. 3
Partly sunny with a 20 percent chance for showers. High around 55 degrees with north winds 0-7 mph.
Sunday night, partly cloudy with a low near 36 degrees. 20 percent chance for showers. North winds 0-7 mph.
Monday, Oct. 4
Partly sunny with a 10 percent chance for showers. High around 57 degrees with north winds 0-7 mph.
Monday night, partly cloudy with a low near 35 degrees. 10 percent chance for showers. North winds 0-7 mph.
Tuesday, Oct. 5
Partly cloudy with a 5 percent chance for showers. High around 61 degrees with north winds 0-7 mph.
Tuesday night, partly cloudy with a low near 37 degrees. 5 percent chance for showers. Northwest winds 0-7 mph.
8- to 14-day trends: Oct. 6-12
Above normal temperatures / Below 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.