Historical weather data, all-time temperature records, and monthly climate averages for Brunswick, ME. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Brunswick runs cool, with an average high of just 47° and a low near 28°—but the range is wild. This date has seen everything from a balmy 78° in 2010 to a brutal 12° low back in 1995. Flip a coin on precipitation: there's a 50% chance of something falling, with a 1-in-6 shot it comes down as snow.
Brunswick plays for keeps on the extremes. The thermometer has swung from a scorching 99° in June 2025 all the way down to -27° in January 2009—a 126-degree spread over 33 years of records. A single January storm dropped 20.4 inches of snow in 2015, and a June deluge in 1998 dumped nearly 6 inches of rain in one day.
Summer is the sweet spot: highs peak around 80-81° in mid-July before fading fast into fall. By late January, average highs scrape 29°, making it one of the coldest stretches of the year. If you're trying to dodge rain, avoid late November through early December, when Brunswick averages its wettest week of the year.