Headed to the coast? I’ve spent my fair share of time in Portland, Maine, and I always check the forecast before I chase lobster rolls or stroll past lighthouses. Here’s what I’ve learned about the weather so you can plan just right.

Highlights (From My Experience)

  • Enjoy those mild summer days—I’ve had perfect seaside adventures with highs in the 70s°F.
  • Experience the magic of fall. I’ve timed trips around late September just to catch that vibrant foliage. You should too.
  • Prepare for snowy winters. I’ve braved a few—temps hover in the 20s–30s°F, so bring the warm layers.
  • Pack smart. I always bring layers in spring and fall—you’ll thank me when a chilly morning turns into a warm afternoon.
  • Expect ocean breezes and fog, especially early in the day. I’ve walked through that quiet mist more times than I can count—and I always love it.

Weather by Month:

January is the coldest month in Portland with average high temperatures of 31°F (0°C), and average low temperatures of 13°F (-10°C). January is considered the best month for winter sports as it sees the highest average of snowfall in the entire year - a hefty 19 inches (48 cm).

In February, temperatures rise slightly and the average snowfall decreases to 12 inches (31 cm). Average high temperatures creep up by about 4 degrees, 35°F (1°C), while average lows are at 16°F (-9°C).

Portland weather in March: Temperatures continue a steady rise in March with winter nearing its end. Snowfall increases by roughly an inch and average high temperatures peak at 42°F (6°C). Winter activities continue to be top recreational activities thanks to Portland’s the steady snowfall.

In April, temperatures range between an average high of 53°F (12°C) and an average low of 35°F (2°C). Snowfall dramatically decreases to 3 inches (8 cm), finalizing the transition of the season to spring.

May sees an average high temperature of 64°F (18°C). Make sure to keep a light cardigan or sweater on you or nearby though as the weather tends to fluctuate and average lows can hit a crisp 44°F (8°C).

Portland weather in June: The temperature in June jumps to an average high of 73°F (23°C) as summer starts to roll around. June is a great time to start planning trips to nearby lakes or beaches as the state typically has a comfortable statewide summer climate. Average low temperatures reach 54°F (12°C).

July is the warmest month in Portland with average high temperatures peaking at 79°F (26°C). Summer nights are comfortably cool at 59°F (15°C).

In August, average high temperatures cool by a degree. Low temperatures also decrease a tad to 58°F (15°C). August is also the driest month in Portland with average precipitation of 3 inches (80 mm).

September marks the beginning of summer’s end with the monthly highs and lows ranging between 50°F (10°C) and 70°F (20°C).

Portland weather in October: Precipitation averages for October are one of the city’s highest at nearly 5 inches (124 cm). Temperatures also make a significant decrease with an average high temperature of 59°F (15°C).

November has the highest level of precipitation in Portland at 5 inches (125 cm). Temperatures continue to drop and short bouts of snow fall begin. Average low temperatures can hit a chilly 31°F (-1°C).

In December, temperatures continue to drop for Portland’s third coldest month and snowfall leaps to a 13 inch average (33 cm). The average high temperatures are 37°F (3°C) while average low temperatures can sink to 20°F (-6°C).

The best months to enjoy lobster in Maine are April through June and December, while soft-shell lobsters are plentiful towards the tail end of summer in September. Best months for whale watching are typically between June and September, but are usually largely depending on when the herring start arriving as well. Fall foliage displays at their best in October. Verified Resource: National Weather Service

Frequently Asked Questions

  • What kind of climate does Portland, Maine have?
    • I’ve always found Portland’s weather pleasantly mild, even in winter. You’ll notice the peninsula helps shield the city from the harsher moods of the Atlantic Ocean, which means cool summer breezes and gentler winters than you might expect this far north.
  • How many seasons does Portland, Maine experience?
    • I’ve visited during all four, and each one offers something special. You’ll get a full range—spring blooms, warm summers, vibrant fall foliage, and snowy winters.
  • When is the best time to visit Portland, Maine for gardens?
    • I always recommend spring to fellow garden lovers. That’s when everything starts to bloom, and the city feels alive again. Even local museums and restaurants that took a winter break start reopening, so you’ll enjoy the full experience.
  • When is the best time to visit Portland, Maine for great weather?
    • I’m a big fan of summer here—lots of sunshine, cool breezes, and endless reasons to be outside. You’ll want to explore beaches, go sailing, or just stroll the waterfront with an ice cream in hand.
  • When can I see the best fall foliage in Portland?
    • October is when I aim for a fall visit. You’ll see the leaves change into bold reds, oranges, and yellows—it’s seriously stunning. I always try to catch at least one sunrise over the harbor during this time.
  • What activities are available in Portland, Maine during winter?
    • If you enjoy outdoor winter fun like I do, you’re in luck. You’ll find spots for skiing, sledding, and even ice skating. I’ve bundled up and braved the snow many times—and it’s always worth it.
  • When is the best time to enjoy lobster in Maine?
    • You haven’t really done Maine until you’ve had lobster. I try to visit between April and June or again in December—those are prime times. And if you love soft-shell lobster like I do, come in September when they’re especially sweet and tender.
  • What is the best time for whale watching in Portland, Maine?
    • I’ve had the best luck June through September. It really depends on when the herring arrive, but trust me—when they do, the whales follow. Bring your binoculars and a bit of patience—you won’t regret it.


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