Showers Will Arrive Across Maine This Sunday

The state will see cooler temperatures and rain as the weekend concludes.

Updated on Sept. 19, 2026 in Current Conditions

A rugged granite coastline in Maine under an overcast, rainy sky with dark pine trees. — Showers are forecast to arrive across Maine on Sunday afternoon, signaling a shift toward temperatures that remain below the seasonal average through early next week. AI Illustration. Upload story photo >

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Is now a good time to prepare your home for frost and colder temperatures?

Showers are set to arrive across Maine on Sunday afternoon following a cool, sunny Saturday. This rainfall marks the beginning of a period of temperatures remaining below the seasonal average.

Why it matters

Residents should prepare for a shift in weather as the state transitions from a dry Saturday to wetter conditions. The incoming moisture and cooler air will persist through the first half of the work week.

Saturday high temperatures are expected to reach the mid-60s with low humidity. Frost is possible in mountain regions between Tuesday and Thursday.

The details

Clouds will increase overnight on Saturday, leading into the arrival of showers on Sunday afternoon. These conditions are expected to persist in coastal regions after sunset.

September 19, 2026: Saturday weather remains cool and sunny with highs in the mid-60s.
September 20, 2026: Showers arrive in Maine during the afternoon hours.
September 21, 2026: Monday will start off mostly rain-free across the state.
September 22-24, 2026: Frost is possible in mountain regions during this timeframe.

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Seasonal Patterns

The upcoming weather pattern follows the baseline established by the National Weather Service's seasonal temperature averages. This cooling trend represents a notable departure from warmer conditions often seen earlier in the month.

Residents in mountain regions should prepare for potential frost in their gardens or outdoor equipment early next week. Drivers should be aware of changing road conditions as showers arrive throughout Sunday.

The takeaway

Plan for cooler than average temperatures as the work week begins on Monday. Outdoor plans for Sunday afternoon should account for the arrival of light rain.