St. John Valley weather, June 12-18, 2024

5 days ago

3-Day Outlook: Wed. June 12 – Fri. June 14

An upper-level low will slowly drift towards the Maritimes with a chance of showers this morning with showers likely this afternoon and evening along with scattered thunderstorms this afternoon. Rainfall totals between 1/4 and 1/2-inch are possible with higher totals in any storms that occur, and given weak flow aloft, showers/storms will be slow-moving producing locally heavy downpours and possibly localized flooding. Partly cloudy skies develop tonight with showers ending by midnight. 

High pressure builds in Thursday as the upper low moves into the Maritimes. An approaching cold front will bring increasing chances of showers Thursday night with showers likely Friday morning. Gusty southwest winds are expected for the Saint John Valley as well. Some lingering showers are possible Friday night behind the front with partly cloudy skies developing.

Daily Summary

Today: Patchy fog this morning. Partly sunny with scattered showers this morning, then mostly cloudy with numerous showers and scattered thunderstorms this afternoon. Highs in the lower 70s. South winds around 5 mph. Chance of rain 70 percent.

Tonight: Partly cloudy with numerous showers and scattered thunderstorms in the evening, then mostly clear after midnight. lows in the mid-50s. Southwest winds around 5 mph. Chance of rain 70 percent.

Thursday: Mostly sunny in the morning, then becoming partly sunny. Highs in the upper 70s. Southwest winds 5 to 10 mph with gusts up to 20 mph.

Thursday Night: Partly cloudy in the evening, then becoming mostly cloudy. A 50 percent chance of showers. Lows in the lower 60s. South winds 10 to 15 mph.

Friday: Showers. Highs in the mid-70s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 90 percent.

Friday Night: Partly cloudy. A chance of showers in the evening. Cooler with lows in the mid-40s. Chance of rain 40 percent.

4-7 Day Outlook: Sat. June 15 – Tue. June 18

High pressure near the Great Lakes builds east into the Valley on Saturday and crests over the Sunday into Monday then moves east into the Atlantic Sunday into Monday. Temperatures and humidity increase Tuesday as highs reach the 80s with dew points rising into the upper 50s/low 60s. The high looks to set up a block in the Atlantic as next week progresses, though some precipitation may be possible by midweek, depending on the Atlantic high’s strength.

Daily Summary

Saturday: Mostly sunny. Highs in the mid-60s.

Saturday Night: Clear. Lows in the lower 40s.

Sunday: Sunny. Highs around 70.

Sunday Night: Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 40s.

Monday: Partly sunny. Highs in the mid-70s.

Monday Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the mid-50s.

Tuesday: Partly sunny in the morning, then becoming mostly sunny. Highs in the mid-80s.

Tuesday Night: Partly cloudy. Lows in the mid-60s.

8-14 Day Regional Climate Trends: Wed. June 5 – Mon. June 10

Above normal temperatures / Near normal precipitation

Note: Computer model precision diminishes the further into 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.