St. John Valley weather, June 4-10, 2025

Joseph E. Becker, Special to The County
2 weeks ago

7-Day Outlook: Wednesday, June 4-Tuesday, June 10

High pressure will remain south of the region today bringing warm temperatures to the Saint John Valley with daytime highs in the middle 80s. Skies will be hazy today thanks to Canadian wildfire smoke around 6 to 10 thousand feet aloft over the region. 

Currently, no major impact at the surface is expected; however, daytime mixing of the atmosphere may allow some smoke to mix down to the surface and create some reduction in visibility due to haze. Tonight, some haze, creating an orange hue on the waxing moon, will remain aloft with the sky otherwise clear over the SJV. Lows fall into the lower 60s for most locations.

A cold front approaches tonight as the high pressure ridge aloft begins to break down with partly sunny skies in the morning. As the cold front moves across the region, afternoon showers and scattered thunderstorms are possible. Greatest risk of storms will be between 12 pm through 8 pm A few storms may become strong with gusty winds, small hail, and heavy rainfall. 

Storms look to wane Thursday evening with the loss of daytime heating as the front moves to the coast and stalls out overnight. For Friday, expect partly sunny skies and daytime highs in the low 80s. Friday night, skies become mostly cloudy with isolated showers possible after midnight.

A wave of low pressure is expected to move along the frontal boundary, but forecast models differ with regards to strength, speed, and location of the system. However, most agree it will be another unsettled and wet weekend. So Valley resident can expect widespread rain on Saturday, especially in areas to the south.

Early next week, high pressure will build to the east while low pressure stays to the west near the Great Lakes. This pattern will bring a steady flow of moisture from the Gulf of Mexico, which means continued chances for rain and possibly some isolated thunderstorms, especially in the afternoons.

Daily Forecast Summary 

Today: Mostly sunny this morning, then becoming partly sunny. Hazy. Highs in the mid-80s. Southwest winds 5 to 10 mph with gusts up to 20 mph.

Tonight: Clear, hazy. Lows in the lower 60s. Southwest winds 5 to 10 mph.

Thursday: Mostly sunny with isolated showers in the morning, then mostly cloudy with numerous showers and scattered thunderstorms in the afternoon. Thunderstorms may produce gusty winds, small hail, and heavy rainfall in the afternoon. Highs in the lower 80s. West winds 5 to 10 mph. Chance of rain 60 percent.

Thursday Night: Mostly cloudy with scattered showers with isolated thunderstorms in the evening, then partly cloudy after midnight. Patchy fog after midnight. Thunderstorms may produce gusty winds, small hail, and heavy rainfall in the evening. Lows in the mid-50s. Northwest winds around 5 mph. Chance of rain 50 percent.

Friday: Partly sunny. Highs in the upper 70s. Northwest winds 5 to 10 mph.

Friday Night: Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the lower 50s. Chance of rain 30 percent.

Saturday: Mostly cloudy. A chance of showers in the morning, then showers likely in the afternoon. Highs in the upper 60s. Chance of rain 70 percent.

Saturday Night: Mostly cloudy. Showers likely, mainly in the evening. Lows in the lower 50s. Chance of rain 60 percent.

Sunday: Partly sunny with a 40 percent chance of showers. Highs around 70.

Sunday Night: Partly cloudy. A chance of showers in the evening. Lows in the upper 40s. Chance of rain 30 percent.

Monday: Mostly sunny in the morning, then becoming partly sunny. Highs in the mid-70s.

Monday Night: Partly cloudy in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the mid-50s. Chance of rain 40 percent.

Tuesday: Mostly cloudy with a chance of showers. Highs around 70. Chance of rain 50 percent.

Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a high around 56. Chance of precipitation is 50 percent.

Note: Computer model precision diminishes the later in the week the forecast projects. Check The County.me or the National Weather Service Caribou, ME at for weather updates with more current information for the Saint John Valley.

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.