What to Wear in Boston in Summer: Month-by-Month Outfit Guide
Boston in summer sits in the 70 to 85°F range. This is the layer-by-layer outfit guide for Boston's summer weather — what to wear, what to pack for a visit, and the local context that shapes the recommendations.
WHAT TO EXPECT
70 to 85°F is the typical range for Boston in summer (June, July, August). June through August. 75-90°F with humidity. Coastal Boston is slightly cooler than inland. The temperature range is the headline; what you actually feel depends on humidity, wind, and what indoor spaces you'll cycle through.
THE FOUNDATION LAYER
Lightweight, breathable single layer. Linen, cotton voile, or technical synthetic.
THE MID LAYER
Optional. A light cardigan or unstructured blazer handles cool mornings and air-conditioned interiors.
THE OUTERWEAR
Optional. A linen blazer or light overshirt handles cool evenings and indoor air conditioning.
ACCESSORIES
Sun hat, UV-rated sunglasses, sandals or breathable sneakers, and a light scarf for over-AC interiors.
WHAT TO PACK FOR A TRIP TO BOSTON IN SUMMER
Three layer permutations covering the 70 to 85°F range, plus accessories. If your trip spans the season's edge (early March or late November), pack toward the cooler end of the range — overestimating warmth is easier to recover from than underestimating.
LOCAL CONTEXT
Boston winter wind off the harbor is biting. The T (subway) is heated; the platforms often are not. Dress for both. Quality boots that handle salt are non-negotiable.