St. John Valley weather for Sept. 18-20, 2024

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

3-Day Outlook: Wednesday, Sept. 18 – Friday, Sept. 20

High pressure will remain across the Valley today into Thursday. A cold front will drop down from Canada Thursday with a slight chance of isolated showers across the region. Cooler, dry air will then settle across the SJV for the weekend.

Daily Summary 

Today: Mostly sunny. Highs in the lower 80s. West winds around 5 mph.

Tonight: Mostly clear. Patchy fog after midnight. Lows in the mid-50s. West winds around 5 mph.

Thursday: Patchy fog in the morning. Partly sunny. Highs in the mid-70s. North winds around 5 mph.

Thursday Night: Partly cloudy in the evening, then becoming mostly cloudy. Areas of fog after midnight. Lows in the lower 50s. Northeast winds around 5 mph.

Friday: Partly sunny in the morning, then clearing. Patchy fog in the morning. Highs in the upper 60s. East winds around 5 mph.

Friday Night: Mostly clear. Lows in the mid-40s.


4- to 7-Day Outlook: Saturday, Sept. 21 – Tuesday, Sept. 24

High pressure looks to build down from our northeast in Canada bringing a cooler, dry air mass into the Valley for the weekend. An off-shore system will be suppressed by the ridge of high pressure and remain over the waters as it tracks away. Cooler, dry air remains over the region heading into the upcoming week. Highs in the 60s with overnight lows in the 40s can be expected.

Daily Summary

Saturday: Mostly sunny. Highs in the upper 60s.

Saturday Night: Mostly clear in the evening, then becoming partly cloudy. Lows in the mid-40s.

Sunday: Partly sunny. Highs in the lower 60s.

Sunday Night: Partly cloudy in the evening, then clearing. Patchy fog after midnight. Lows around 40.

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

Monday Night: Mostly clear. Lows around 40.

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

Tuesday Night: Partly cloudy, with a slight chance of showers. low in the mid-40s. Chance of precipitation is 20 percent.

8- to 14-day Regional Climate Tends: Wednesday, Sept. 25 – Tuesday, Oct. 1 

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.