Boston in August
In August, Boston averages 27°C (81°F) during the day and 17°C (63°F) at night, with around 9 days of rain (94 mm total).
High seasonConditions are warm and beach-friendly. Occasional showers are likely but won't dominate.
It's peak hurricane season in Boston during August. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How August compares to the rest of the year in Boston
August is one of the warmest months in Boston (2nd of 12) and one of the driest months (11th of 12). Daytime temperature runs 12°C above the annual average (15°C). August runs 1°C cooler than July (28°C) and cools 4°C in September (23°C).
August sunrise & sunset in Boston
Times shown for Boston local time (America/New_York), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in Boston — August
Golden-hour and blue-hour windows for the 15th of August, in Boston's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Boston in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (High season) and Boston's popularity.
Crowds & pricing — August in Boston
This is a busy month in Boston — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: comfortable tourism weather Northern Hemisphere summer holidays peak hazard season (1 active)
Sun & mosquito risk — August in Boston
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Boston — August
Across the year Boston's sea swings from 3.5°C (February) to 19.6°C (August) — August sits at 19.6°C.
Boston in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 2°C / 36°F | -6°C / 21°F | 88 mm | 10 | 10 |
| February | 3°C / 37°F | -5°C / 23°F | 88 mm | 10 | 9 |
| March | 7°C / 45°F | -1°C / 30°F | 104 mm | 11 | 5 |
| April | 14°C / 57°F | 4°C / 39°F | 92 mm | 11 | 1 |
| May | 19°C / 66°F | 9°C / 48°F | 88 mm | 11 | 0 |
| June | 25°C / 77°F | 15°C / 59°F | 95 mm | 11 | 0 |
| July | 28°C / 82°F | 18°C / 64°F | 84 mm | 9 | 0 |
| August | 27°C / 81°F | 17°C / 63°F | 94 mm | 9 | 0 |
| September | 23°C / 73°F | 13°C / 55°F | 85 mm | 9 | 0 |
| October | 17°C / 63°F | 7°C / 45°F | 96 mm | 10 | 0 |
| November | 11°C / 52°F | 2°C / 36°F | 108 mm | 11 | 1 |
| December | 5°C / 41°F | -3°C / 27°F | 106 mm | 12 | 7 |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for Boston in August →
Frequently asked questions
How hot is Boston in August?
In August, Boston averages a high of 27°C (81°F) and a low of 17°C (63°F) — generally warm.
Does it rain a lot in Boston in August?
August sees occasional rain in Boston, with about 9 rainy days on average.
Is August a good time to visit Boston?
August is warm. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Boston in August?
Pack lightweight, breathable clothing, sunglasses and sunscreen. See the full August packing list for Boston for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.