Penobscot County, ME

Alerts

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County Line

No alerts for Penobscot County, ME, for the next 5 days

No alerts for Penobscot County, ME, on Saturday

No alerts for Penobscot County, ME, on Sunday

No alerts for Penobscot County, ME, on Monday

No alerts for Penobscot County, ME, on Tuesday

No alerts for Penobscot County, ME, on Wednesday

Briefings

No recent briefing available

From the Forecaster

Potential Frost Tonight

Created by the NWS Caribou WFO

Good Afternoon, possible frost tonight with highest chances in the North Woods/ Eastern Aroostook, clearing out during the morning on Sunday. Mostly cloudy to start out the day on Sunday, with rain showers moving in during the evening hours and throughout the overnight hours.

Image Description

A weather forecast for Maine from September 19, 2026, highlighting a "Potential Frost Tonight." A map shows low temperatures tonight (Saturday night) ranging from 32°F in northern Maine to 50°F on the coast. Patchy frost is possible in northern and eastern Aroostook. Rain showers are expected Sunday evening, but will not significantly help ongoing drought conditions. A precipitation forecast table shows probabilities up to 55% for many areas by Sunday evening, decreasing into Monday.

Caribou Area Forecast Discussion

Seven-day Weather Risk Overview

The graphic shows the daily risk summary for 7 days. Daily risk is based on highest risk factor for that day.

	Thu 9/10	Thu 9/10	Fri 9/11	Sat 9/12	Sun 9/13	Mon 9/14	Tue 9/15
risk level		out of 10

No risk

Low risk

High risk

See the detailed risk analysis

Radar

Time shown:

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dBz	Intensity
−35–0	Extremely light (drizzle/snow)
0–20	Very light precipitation or general clutter
20–40	Light precipitation
40–50	Moderate precipitation
50–65	Heavy precipitation or some hail
>65	Extremely heavy precipitation including water-coated hail