Planning a trip to Boston in August? This guide covers everything you need to know about Boston weather in August, including average temperatures, rainfall, what to wear, and the best things to do during your visit.
With my background as a retired meteorologist and Boston tour guide, I’ll help you understand what kind of weather to expect so you can plan your sightseeing with confidence.
Boston Weather in August at a Glance
- Average high temperatures: upper 70s to low 80s F (24-28 C)
- Average low temperatures: mid to upper 60s F (17-20 C)
- Rainy days: about 9-10 days
- Sunny or partly sunny days: about 18 days
- Daylight: about 13-14.5 hours
- Weather: Warm, occasionally humid, but generally great for exploring outdoors
August is one of the most popular months to visit Boston, with plenty of sunshine, long daylight hours, and many outdoor activities happening throughout the city.
HOW HOT IS BOSTON IN AUGUST?
August in Boston is typically warm, with comfortable mornings and evenings but some hot and humid afternoons.
Early in the month, afternoon high temperatures usually reach the lower 80s F (27-28 C). By the end of August, average highs generally drop into the mid to upper 70s F (24-26 C).
A few warmer days each August can reach the lower 90s F (32-33 C). On average, Boston sees about 2-3 days where temperatures reach 90 F or higher.
The record high temperature for Boston in August is 102 F (38.9 C).
Boston August Morning and Evening Temperatures
Early August mornings and late evenings are usually mild, with temperatures in the mid to upper 60s F (19-20 C).
As the month progresses, temperatures become slightly cooler, with late August mornings often falling into the mid to lower 60s F (17-18 C).
Occasionally, cooler mornings can dip into the mid-50s F (12-13 C).
The record low temperature for Boston in August is 47 F (8.3 C).
Is Boston Humid in August?
Boston weather in August can vary from humid summer days to more comfortable stretches of dry weather.
Typically:
- 7-12 days may feel humid or muggy
- 10-16 days are likely to feel comfortable and dry
Humidity is generally more common during the beginning of August and becomes less frequent toward the end of the month.
Overall, August is a great time to explore Boston on foot, including our pay-what-you-wish and prepaid walking tours where you choose the experience that works best for you.
How Much Sun and Rain Does Boston Get in August?
August is one of the brighter months of the year in Boston, making it a great time for sightseeing, outdoor attractions, and walking tours.
Boston typically sees:
- Around 18 days with sunny or partly sunny skies
- Around 9-10 days with some rainfall
- About 2 days with significant rainfall of at least 0.5 inches (13 mm)
Daylight hours are still long in August. At the beginning of the month, Boston receives about 14.5 hours of daylight, decreasing to just over 13 hours by the end of the month.
This means plenty of time to explore neighborhoods, historic sites, waterfront areas, and outdoor attractions.
Boston Weather Forecast Outlook: July Through September
The seasonal outlook for late summer suggests:
- 92% chance of normal to above-normal temperatures
- Near-normal rainfall expected
Visitors should plan for warm summer conditions, but also pack a few items for cooler mornings, evenings, and occasional rainy days.
What to Wear in Boston in August
Boston in August is still summer, so lightweight clothing is the best choice for most days.
Recommended items include:
- Comfortable walking shoes
- Lightweight shirts and shorts
- Sunglasses and sunscreen
- A hat for sunny days
- A reusable water bottle
A few cooler mornings and evenings may feel refreshing, especially later in the month, so bringing a light sweater, jacket, or windbreaker is a good idea.
Since Boston is a very walkable city, comfortable shoes are one of the most important things to pack.
Things to Do in Boston in August
August is one of the best months to enjoy Boston’s outdoor attractions, festivals, waterfront activities, and historic neighborhoods.
Below the video, we share some of our favorite things to do in Boston during August.
For even more ideas, check out our complete guides:
Popular Boston August Activities Include:
See Live Music and Performances
Enjoy summer concerts, theater performances, and outdoor entertainment throughout the city.
Attend Major Sporting Events
August is a great time to experience Boston sports culture.
Watch Outdoor Movies
Catch a movie under the stars at one of Boston’s summer outdoor screenings.
Explore Free Festivals and Events
Boston hosts many free community events, cultural festivals, and outdoor gatherings during August.
Attend the Boston Seafood Festival
Celebrate New England seafood with food, entertainment, and waterfront activities.
Take a Walking Tour of Boston
August’s long daylight hours and warm weather make it an excellent month to explore Boston’s historic neighborhoods.
Join one of our Tours By Foot Boston walking tours and discover the city’s history with a local guide.
Cruise the Charles River
Enjoy beautiful views of Boston and Cambridge from the water.
Save Money on Boston Attractions
If you plan to visit several museums, attractions, or paid experiences, consider a Boston tourist pass.
These passes can help visitors save money on some of Boston’s most popular attractions, tours, and activities.
Join Our Boston Travel Community
Planning a trip to Boston? Join our Facebook group for travel tips, recommendations, and ideas from locals and fellow visitors.
Fred Pickhardt
Ocean Weather Services
