Climate Insights for Boston

The climate in Boston is warm and mild. The average annual temperature is 21°C and approximately 1108mm of precipitation falls per year. Boston receives a notable amount of rainfall throughout the year, including during its driest month. Boston is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Agosto, Luglio, Giugno. The coldest months are Gennaio, Dicembre, Febbraio, when temperatures can drop to 7°C.

Temperatures in Boston vary considerably across the year, with a 26°C difference between the coldest and warmest months. The warmest month is Agosto, when average highs reach 33°C and the mean temperature sits around 28°C. Gennaio is the coolest month, with minimum temperatures around 7°C and an average of 11°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Boston is a moderately rainy area, receiving approximately 1108mm of precipitation annually, which averages out to around 92mm per month. The wettest month is August, averaging 132mm of rainfall. July and June also tend to see above-average precipitation. The driest month is October, with just 52mm. That's 80mm less than August, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Boston is mildly breezy, with an average annual wind speed of 14km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 16km/h in winter, 16km/h in spring, 13km/h in summer, 14km/h in autumn.

It is currently winter in Boston, which began on December 21, 2026. Boston is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in Agosto at around 33°C, while the coldest stretch bottoms out in Gennaio near 7°C. Spring is next, beginning on March 20, 2026 — 1 days from now.

The best time to visit Boston is during Marzo, Aprile, Maggio, Ottobre and Novembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 67mm per month. By contrast, Agosto can be uncomfortably hot with highs reaching 33°C, while Gennaio is the coldest period with lows dropping to 7°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Boston based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.