The biggest temperature swing occurs between September and October, with a change of 6.3°C / 43.3°F.
| Month | Low Temperature | High Temperature | Category |
|---|---|---|---|
| January | -6.8°C | 1.8°C | COLD |
| February | -6.1°C | 3.2°C | COLD |
| March | -2.1°C | 7.2°C | COLD |
| April | 3.6°C | 13.4°C | COOL |
| May | 9.4°C | 18.9°C | MILD |
| June | 15°C | 24.4°C | WARM |
| July | 18.7°C | 27.8°C | WARM |
| August | 18°C | 26.9°C | WARM |
| September | 14.3°C | 22.7°C | WARM |
| October | 8.3°C | 16.4°C | MILD |
| November | 2.4°C | 10.2°C | COOL |
| December | -2.8°C | 4.8°C | COLD |
March is wettest at 114.8 mm / 4.52 inches, while July is driest at 82.7 mm / 3.26 inches.
| Month | Baseline | Rainfall | Category |
|---|---|---|---|
| January | 0 mm | 100.3 mm | MODERATE |
| February | 0 mm | 83.7 mm | MODERATE |
| March | 0 mm | 114.8 mm | MODERATE |
| April | 0 mm | 100.4 mm | MODERATE |
| May | 0 mm | 86.3 mm | MODERATE |
| June | 0 mm | 89.2 mm | MODERATE |
| July | 0 mm | 82.7 mm | MODERATE |
| August | 0 mm | 84.6 mm | MODERATE |
| September | 0 mm | 94.9 mm | MODERATE |
| October | 0 mm | 110.5 mm | MODERATE |
| November | 0 mm | 89.9 mm | MODERATE |
| December | 0 mm | 113.5 mm | MODERATE |
June has the strongest UV (about index 8), rated very high.
| Month | Baseline | UV Index | Category |
|---|---|---|---|
| January | 0 | 3.1 | MODERATE |
| February | 0 | 4.6 | MODERATE |
| March | 0 | 6 | MODERATE |
| April | 0 | 7.2 | HIGH |
| May | 0 | 7.8 | HIGH |
| June | 0 | 8 | VERY HIGH |
| July | 0 | 8 | HIGH |
| August | 0 | 7.5 | HIGH |
| September | 0 | 6.6 | HIGH |
| October | 0 | 5.2 | MODERATE |
| November | 0 | 3.5 | MODERATE |
| December | 0 | 2.5 | LOW-MOD |
Daylight ranges from 9.1h in December to 15.2h in June, a 6.1h difference.
| Month | Baseline | Daylight Hours | Category |
|---|---|---|---|
| January | 0h | 9.5h | SHORT |
| February | 0h | 10.6h | BALANCED |
| March | 0h | 12h | BALANCED |
| April | 0h | 13.4h | LONG |
| May | 0h | 14.6h | LONG |
| June | 0h | 15.2h | LONG |
| July | 0h | 14.9h | LONG |
| August | 0h | 13.8h | LONG |
| September | 0h | 12.5h | BALANCED |
| October | 0h | 11h | BALANCED |
| November | 0h | 9.8h | SHORT |
| December | 0h | 9.1h | SHORT |
Daylight varies from 9.1 hours in December (winter) to 15.2 hours in June (summer), which is a difference of 6.1 hours.
Northern Hemisphere seasons shape the weather patterns throughout the year. Here's what to expect in each season:
Click any month for detailed weather information and packing advice.
Get personalized month rankings based on weather comfort, outdoor activity suitability, and seasonal conditions.
View Best Time to VisitThe best months to visit Boston depend on your preferences. For warm weather, July is typically the warmest month. For dry conditions, July, February, August tend to have the least rainfall. Consider your priorities, and whether you prefer warmer temperatures, drier weather, or longer daylight hours.
July is typically the warmest month in Boston, with average high temperatures reaching around 28°C (82°F). This is peak summer weather, ideal for outdoor activities and sightseeing.
January is usually the coldest month, with average low temperatures dropping to around -7°C (19°F). Pack warm layers if visiting during this time, especially for evening activities.
March typically sees the most rainfall in Boston, averaging around 115mm (4.5 inches). It's wise to pack waterproof layers and have some indoor backup plans if you're visiting during this month.
July is typically the driest month, with average rainfall of just 83mm (3.3 inches). This makes it an excellent time for outdoor exploration and activities with minimal risk of rain disruption.
Temperatures in Boston range from average lows of 6°C (43°F) to highs of 15°C (59°F). This variation means you'll want to pack differently depending on when you visit, as layers are key for adapting to the seasonal changes.
Yes, sun protection is important in Boston. UV levels can reach 8 during peak months, which is considered very high. Pack sunscreen (SPF 30+), sunglasses, and a hat, especially if you'll be outdoors for extended periods.