Measured, not vibes
Best Time to Visit Boston
By measured weather comfort, the top months for Boston are September, May, June — and RouteVerdict's editorial pick, which also weighs crowds and prices, is May, June, September, October. The table below is computed from ERA5 reanalysis data for 2020–2024, measured at Boston (14 m elevation).
Month by month
Boston weather and comfort, 2020–2024
| Month | Avg high | Wet days | Comfort | Season |
|---|---|---|---|---|
| January | 3.9°C / 39°F | 8.7 | 9 | |
| February | 5.1°C / 41°F | 8.2 | 12 | |
| March | 9.5°C / 49°F | 9.5 | 26 | |
| April | 13.3°C / 56°F | 8.7 | 46 | |
| May | 20.2°C / 68°F | 8.3 | 80 | Best |
| June | 25.9°C / 79°F | 8.7 | 78 | Best |
| July | 28.8°C / 84°F | 11 | 63 | Shoulder |
| August | 27.7°C / 82°F | 10.2 | 70 | Shoulder |
| September | 23°C / 73°F | 8.3 | 83 | Best |
| October | 17.8°C / 64°F | 6.8 | 73 | |
| November | 11.7°C / 53°F | 5.7 | 40 | |
| December | 6.5°C / 44°F | 9.3 | 15 |
Comfort is RouteVerdict's 0–100 score: 100·exp(−(high−23)²/162) × (1 − min(0.35, wet days × 0.02)). The full method is on the methodology page. Weather data by Open-Meteo.com (ERA5, CC BY 4.0), 2020–2024 normals. Wet day = ≥1 mm precipitation.
What the seasons are actually like
Traveling to Boston month by month
Boston's comfort score peaks in early autumn: September hits 83.4 with an average high of 23°C and just 8.3 wet days, ahead of May's 79.5 and June's 78.4. Midsummer (July–August) is actually warmer — highs of 27.7–28.8°C — but comfort drops to 63.4–69.5 as humidity climbs, which is why RouteVerdict's editorial pick keeps June but treats peak summer as a step down from the shoulder months. October holds up well too, with a comfort score of 73.1 and cooler highs of 17.8°C. Winter (December–February) is the low point, with highs of 3.9–6.5°C and comfort scores of 8.7–15.2 — genuinely cold, not a season most trips are built around.
FAQ
Boston timing questions
What is the best month to visit Boston?
By measured weather comfort (ERA5 2020–2024), the top months are September, May, and June, with September scoring highest. RouteVerdict's editorial pick is May, June, September, and October, which also weighs crowds, prices, and events.
What is the hottest month in Boston?
July, with an average daily high of 28.8°C (84°F).
What is the rainiest month in Boston?
July, averaging 11 days with at least 1 mm of precipitation.
When is shoulder season in Boston?
August and July — the best-scoring months outside both the measured top three and RouteVerdict's editorial peak-season pick.
Why does Boston's editorial pick include June if July and August are warmer?
June scores a comfort of 78.4, while July and August — despite higher highs of 28.8°C and 27.7°C — drop to 63.4 and 69.5 as humidity rises. Warmer isn't always more comfortable.
What is Boston's single best month for weather?
September, with an average high of 23°C, only 8.3 wet days, and a comfort score of 83.4 — the highest measured for any month.