Maine (Portland)
May
Weather in Maine for May 2026
Your guide to Maine weather in May - trends and predictions
In general, the average temperature in Maine at the beginning of May is 11.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 16.6 °F by the end of May.
The climate of Maine in May is notably wet, with an average of 13 rainy days, and a total of 72.5 mm of precipitation.
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Temperatures
Rain 🌧️
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18
Dry days
13
Rainy days
0
Snow days
16°/9°
Temperatures
15 km/h
Avg max wind
77 %
Avg humidity
Maine Weather May
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What’s the Weather Like in Maine This May?
Discover the average temperatures and weather trends across Maine’s cities this May.
Temperatures trend during May in Maine
See the weather trend as well as the moving average line
May weather in Maine day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 11° /5° | 0.8 mm | 3 | |
| May 2 | Light rain shower | 11° /7° | 1.6 mm | 3 | |
| May 3 | Patchy rain possible | 13° /7° | 1.4 mm | 3 | |
| May 4 |  Overcast | 11° /8° | 0 mm | 3 | |
| May 5 |  Light rain | 10° /6° | 6.8 mm | 3 | |
| May 6 |  Fog | 12° /7° | 45.8 mm | 3 | |
| May 7 |  Partly cloudy | 15° /8° | 9.9 mm | 4 | |
| May 8 | Light rain shower | 12° /8° | 4.7 mm | 3 | |
| May 9 | Light drizzle | 10° /6° | 6.9 mm | 3 | |
| May 10 | Patchy rain possible | 10° /6° | 19.6 mm | 3 | |
| May 11 | Patchy rain possible | 13° /7° | 0 mm | 4 | |
| May 12 | Light rain shower | 12° /6° | 0.3 mm | 4 | |
| May 13 | Patchy rain possible | 12° /7° | 1.1 mm | 3 | |
| May 14 |  Moderate or heavy rain shower | 15° /8° | 5.5 mm | 4 | |
| May 15 | Light drizzle | 15° /10° | 0.7 mm | 4 | |
| May 16 | Patchy rain possible | 15° /10° | 0.1 mm | 4 | |
| May 17 | Patchy rain possible | 13° /9° | 1.2 mm | 4 | |
| May 18 | Partly cloudy | 15° /9° | 0 mm | 5 | |
| May 19 | Patchy rain possible | 14° /8° | 0.1 mm | 4 | |
| May 20 | Partly cloudy | 14° /7° | 0 mm | 4 | |
| May 21 | Mist | 15° /8° | 0 mm | 4 | |
| May 22 | Fog | 18° /10° | 39.7 mm | 4 | |
| May 23 | Light rain shower | 16° /10° | 39.4 mm | 4 | |
| May 24 | Partly cloudy | 17° /10° | 0 mm | 4 | |
| May 25 |  Sunny | 16° /8° | 0 mm | 4 | |
| May 26 | Patchy rain possible | 17° /10° | 0.4 mm | 5 | |
| May 27 | Light rain shower | 15° /10° | 9.2 mm | 4 | |
| May 28 | Fog | 19° /12° | 2.5 mm | 5 | |
| May 29 | Light rain shower | 16° /11° | 14 mm | 4 | |
| May 30 | Partly cloudy | 17° /9° | 0 mm | 4 | |
| May 31 | Partly cloudy | 16° /10° | 36.2 mm | 4 | |
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Important Notice
Our weather forecast for Maine in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Maine forecast closer to your planned date for the most up-to-date weather information.
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Maine in May - FAQ
What are the expected maximum and minimum temperatures in Maine during May?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Maine during May?
Moderate rainfall is anticipated in Maine during May, with a total of 72.5 mm spread over approximately 13 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Maine during May?
The average wind speed in Maine during May is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Maine
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