BostonPhoto: Chris Wood ( User:chris_j_wood ) · CC BY-SA 4.0USA · North America
Best time to visit Boston
Boston is a pronounced four-season destination; spring and autumn offer the most balanced conditions for exploring the city. In the 1991–2025 normals, Boston reaches typical daytime highs of about 23 °C in the strongest candidate month, September. The four selected travel months are May, June, August, September.
Climate decision
Best travel months for Boston
Top recommendation
Next highest scores
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Latest 5-year values 2021–2025
Average of the five most recent complete years compared with the 1991–2025 climate average.
March · Mean daily maximum
7.8 °C
1991–2025: 6.2 °C
+1.6 °C · higher
July · Wet days
16 days/month
1991–2025: 13 days/month
+3 days/month · higher
July · Monthly precipitation
145 mm/month
1991–2025: 98.2 mm/month
+46.8 mm/month · higher
August · Sea temperature
19.3 °C
1991–2025: 18.8 °C
+0.5 °C · similar
August: 36/155 days at or above 30 °C; highest single value 36.8 °C.
Five-year historical sample, not a weather forecast or long-term climate trend. Individual hot days can be far above the monthly mean.
Annual profile · Coast and sea
Boston: the swimming season follows two curves
Average daily highs vary by 27 °C through the year, while the sea varies by 15.4 °C. Air and water temperature should therefore be considered separately.
The practical difference
The month with the highest daytime temperature and the month with the warmest sea need not define the same travel window. Rain and sunshine help resolve the trade-off.
Warmest sea
August · 18.8 °C
Highest average daily high
July and August · 27.6 °C
Fewest rainy days
February · 9.3
Most sunshine
July · 7.3 h
Month by month
Overall suitability per month. Tap a month for details.
All climate figures compared
The table is the complete accessible data view; the charts below highlight selected patterns.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Rain mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| January | 1 | -8 | 10 | 94 | 2.2 | 88 | 1.0 | 5 | 27 |
| February | 2 | -7 | 9 | 83 | 3.3 | 87 | 1.2 | 3 | 30 |
| March | 6 | -3 | 11 | 114 | 4.6 | 83 | 1.0 | 4 | 30 |
| April | 13 | 2 | 11 | 104 | 5.8 | 79 | 0.6 | 6 | 40 |
| May | 19 | 8 | 12 | 93 | 6.7 | 79 | 0.4 | 10 | 54 |
| June | 24 | 14 | 13 | 100 | 7.2 | 78 | 0.4 | 15 | 65 |
| July | 28 | 17 | 13 | 98 | 7.3 | 75 | 0.3 | 18 | 67 |
| August | 27 | 17 | 12 | 92 | 6.6 | 73 | 0.4 | 19 | 70 |
| September | 23 | 13 | 10 | 104 | 5.2 | 75 | 0.5 | 17 | 72 |
| October | 17 | 7 | 10 | 116 | 3.6 | 78 | 0.6 | 14 | 49 |
| November | 10 | 1 | 10 | 96 | 2.5 | 81 | 0.7 | 10 | 33 |
| December | 4 | -4 | 11 | 115 | 1.9 | 86 | 0.8 | 8 | 25 |
Climate through the year
Compare temperature, rainy days, sunshine and, for coastal destinations, sea temperature month by month.
Find a place to stay
Where to stay in Boston
Compare available stays, prices and cancellation terms for Boston on Booking.com.
Booking.comFind places to stayAffiliate link: there is no extra cost to you.
Useful next decisions
Similar destinations
The number is the overall climate score, not a similarity score.
Country and region
Frequently asked questions
When is the best time to visit Boston?
The strongest climate months are June, July, August, September. Values are historical averages, not a forecast.
Which month has the highest average daily maximum temperature in Boston?
Average daily maximum temperatures in Boston are practically tied in July and August at around 28 °C.
When is the sea warmest at Boston?
In August, at around 19 °C.