Fort Kent & the Saint John Valley, Maine
Weather Information

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A fairly amplified but slow-moving late-summer pattern is setting up across northern New England and the Maritimes. Surface high pressure that brought Friday's dry weather is retreating, while weak low pressure and an associated trough south of New England begin lifting northeastward. Increasing Atlantic moisture on an easterly to southeasterly flow will gradually spread into Maine and New Brunswick through today and tonight.

For the Saint John Valley, mostly sunny skies are expected through much of today, with afternoon temperatures reaching the mid-70s. Winds will remain light, becoming southeast at around 5 mph during the afternoon.

Clouds will increase tonight as low pressure approaches and deeper Atlantic moisture works northward. Rain chances will begin increasing after midnight, with showers becoming possible toward daybreak. Any rainfall overnight should remain light, generally less than 0.10 inch. Patchy fog may also develop late tonight. Temperatures will fall into the mid-50s, with east winds around 5 mph.

On Sunday, the initial low pressure system to the south will become absorbed into a broader area of low pressure moving east across Quebec, while a warm front slowly lifts northward across Maine. This will bring more widespread cloud cover and scattered showers to the Valley. Patchy morning fog will also be possible. The persistent easterly flow and cloud cover will hold afternoon temperatures to the upper 60s. East winds will increase to around 10 mph, and rainfall amounts of around 0.10 to 0.25 inch are possible.

Showers will become more numerous Sunday night as the front draws closer, with areas of fog developing at times. Temperatures will remain relatively mild, only falling into the upper 50s to around 60. Southeast winds will be light, generally 5 mph or less. Additional rainfall should remain below 0.10 inch in most locations.

The front will move through the region on Monday. Showers will remain possible during the morning before becoming more numerous during the afternoon, when scattered thunderstorms may also develop. Afternoon temperatures will rebound into the mid-70s as winds turn southerly at 5 to 10 mph. Most locations should receive less than 0.10 inch of rain outside of thunderstorms, although locally higher amounts will be possible beneath any stronger showers or storms.

Showers and a few thunderstorms may continue into Monday evening before gradually tapering as the front moves east of the region. Clouds should begin to break overnight, with temperatures falling into the lower 50s. Winds will become light from the south. Rainfall should again remain light in most areas, although locally higher totals will remain possible with any evening thunderstorms.

An upper-level low centered north of the region in Quebec will move east on Tuesday, keeping conditions somewhat unsettled across Fort Kent and the Saint John Valley. Skies will be partly sunny, but enough instability will remain for scattered showers through the day and a few isolated thunderstorms during the afternoon. Highs will reach the lower 70s, with light southwest winds generally around 5 mph.

Showers and a few thunderstorms may linger into Tuesday evening before gradually diminishing. Skies will remain mostly cloudy overnight, with temperatures falling into the lower 50s.

High pressure will begin building into the region Tuesday night and Wednesday, although lingering upper-level troughing will maintain some instability. Wednesday should feature partly sunny skies with highs in the mid-70s. A few showers may develop during the day, with the better chance for scattered showers and isolated thunderstorms coming during the afternoon. Any activity should fade during the evening, with skies becoming partly cloudy overnight and lows in the lower to mid-50s.

High pressure will take firmer control Wednesday night into Thursday. Mostly clear skies are expected overnight, followed by a mostly sunny and warmer Thursday. Afternoon temperatures should rise into the upper 70s. Thursday night will remain partly cloudy, with only a slight chance of a shower and lows in the mid-50s.

Clouds will increase on Friday as a cold front approaches from the west. The day should remain partly sunny at times, but showers will become more likely, especially during the afternoon. Highs will again reach the upper 70s.

The cold front is expected to move through Friday night, bringing a period of more widespread showers during the evening. Rain chances should diminish overnight as the front moves east of the Valley. Temperatures will fall into the mid-50s.

High pressure currently looks likely to build in behind the front for next weekend, favoring a return to drier conditions and more sunshine.
Normal temperatures at Fort Kent and vicinity during this period are generally in the lower 70s for daytime highs and the upper 40s to around 50 for overnight lows.

Climate Prediction Center outlooks favor above normal temperatures and above normal precipitation across Maine from Saturday, August 29 through Friday, September 4. Large-scale atmospheric patterns support weak troughing across the Northeast, which should allow periodic disturbances and frontal passages to bring intervals of showers while temperatures remain mild overall. Brief cooler periods are possible behind individual fronts, but a prolonged early-season cool-down does not appear likely at this time.