Last updated: February 24, 2025
In August, Boston experiences a vibrant mix of summer warmth and occasional rain, making it a dynamic time to explore the city. Daily maximum temperatures can soar to 33°C (92°F), while averages hover around a comfortable 23°C (73°F), providing the perfect backdrop for outdoor activities. Nights bring a refreshing change with minimum temperatures dipping to 13°C (56°F). However, visitors should be prepared for variability, as the month sees approximately 76 mm (3.0 in) of rainfall spread over 10 days, contributing to a humidity level of 66%. This blend of warmth and moisture invites not only leisurely strolls along the Charles River but also a chance to enjoy Boston's renowned indoor attractions on rainier days.
In August, Boston basks in the warmth of summer, with temperatures showcasing a delightful consistency. The month typically sees minimum temperatures around 13°C (56°F), a slight increase from July, while the average temperature reaches 23°C (73°F), maintaining the pleasant summer vibe. Although the maximums can soar up to 33°C (92°F), the heat remains manageable compared to the peak of July, offering both residents and visitors an ideal setting for outdoor activities. As summer begins to wane, the transition towards cooler autumn months becomes evident, yet August still holds onto its balmy charm, making it a perfect time to explore the historic streets of Boston.
August in Boston marks a transition to late summer, characterized by a relatively low precipitation total of 76 mm (3.0 in). This month sees rain on approximately 10 days, suggesting that while the summer remains warm, precipitation decreases compared to the wetter months earlier in the season, like April and July, which recorded 135 mm (5.3 in) and 115 mm (4.5 in), respectively. Interestingly, the pattern of decreasing rainfall persists into September, indicating a gradual shift towards drier conditions as autumn approaches. This trend in precipitation reflects the typical summer cycle in Boston, where moisture is abundant in spring and early summer, tapering off as the season draws to a close.
In August, Boston experiences a noticeable drop in humidity, reaching 66%, the lowest point of the year. This shift marks a continuation of the gradual decline in humidity seen since the peak of 86% in January. As summer progresses, the city transitions from high humidity levels in the early months, averaging around 72% in June and July, to more comfortable conditions by late summer. Interestingly, humidity begins to increase again in September, climbing to 71%, hinting at the approach of fall. Overall, Boston's humidity trends illustrate a remarkable ebb and flow, enhancing the charm of each season while offering a respite from the sticky summer air in August.
August in Boston sees a UV Index of 9, maintaining the intense levels of the summer months with a corresponding very high exposure category. Similar to July, this means you'll need to be diligent about sun protection, as the burn time is just 15 minutes. This trend reflects the peak UV conditions prevalent during the summer, where outdoor activities should be well-planned to avoid unnecessary sun exposure. As the months shift towards fall, the UV Index gradually declines, signaling a transition to safer outdoor enjoyment. For more detailed insights, check out the Boston UV Index.
UV Risk Categories
August in Boston shines with an impressive 327 hours of sunlight, marking a continuation of the summer's glorious days. This month holds steady with July's peak, reflecting a trend of abundant sunshine during the summer season when residents revel in the warm weather. The late summer sun lingers slightly longer as the days begin to shorten, transitioning into milder September, which offers 278 hours of daylight. The gradual decline in hours is a gentle reminder of the impending fall, with sunlight dipping more significantly as the year progresses. Overall, August serves as a lovely culmination of summer, drawing people outdoors to enjoy the sweltering warmth before the crisp autumn air sets in.
In Boston, the chances of enjoying sunny weather noticeably dip in August, with only a 29% likelihood of sunshine. This marks a decline from the more promising summer months, particularly June and July, which boast chances of 39% and 33%, respectively. Interestingly, as the seasons transition, the likelihood of sun appears to rebound in September at 44%, suggesting that while August may often feel like the tail end of summer, early fall can bring renewed brightness. Overall, Boston's weather patterns reveal a distinct trend, where summer’s warm embrace gives way to more variable skies as August rolls around, hinting that travelers might want to prepare for some overcast days.
As summer wanes, August in Boston offers a delightful balance of daylight, with approximately 13 hours of sun illuminating the city. The month marks a gradual transition from the peak 15 hours in June and 14 hours in July, signaling the start of shorter days. This slight decline continues into September, where daylight dips further to 12 hours. The patterns of the year reflect a comforting rhythm, as Bostonians enjoy the lingering warmth and longer evenings of late summer before the days contract significantly into autumn, eventually trailing down to just 9 hours by November and December.
In August, Boston experiences its slightest breezes of the year, with an average wind speed of just 3.1 m/s (7 mph). This continuation of the trend seen from the previous months signals a shift towards the calmness of late summer, as wind speeds have gradually dwindled from the 4.7 m/s (11 mph) recorded in March to their low point in August. Following this lull, a slight uptick in winds can be felt in September, hinting at the transition into fall. Overall, the August winds reflect a serene period in Boston’s climate, inviting residents and visitors alike to enjoy the warmth and tranquility before the seasonal changes unfold.
The weather in Boston changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Boston and find detailed weather information for every month.
The weather in August and January presents a striking contrast in temperature and conditions. August enjoys a milder climate with average temperatures around 23°C (73°F) and highs peaking at 33°C (92°F), accompanied by moderate humidity at 66%. In contrast, January is much colder, featuring average temperatures at around 0°C (32°F) and lows plummeting to -19°C (-3°F), with higher humidity levels at 86%. Precipitation levels are relatively similar, with August experiencing 76 mm (3.0 in) over 10 days and January slightly higher at 79 mm (3.1 in) over 9 days. For more detailed information, you can check out Boston weather in January.
August and February offer starkly contrasting weather experiences. In August, temperatures range from a mild 13°C (56°F) at night to a hot 33°C (92°F) during the day, with an average around 23°C (73°F). With 76 mm (3.0 in) of precipitation over about 10 days, humidity levels hover around 66%, making it a warm and often muggy month.
In contrast, February is characterized by much cooler temperatures, with a chilling minimum of -16°C (4°F) and an average of just 1°C (34°F), peaking at 20°C (68°F). Precipitation slightly increases to 97 mm (3.8 in) across the same number of days, and humidity rises to 84%, contributing to a damp and frigid atmosphere. For more detailed insights, you can explore Boston weather in February.
When comparing the weather in August and March, there are striking contrasts. August boasts milder temperatures with averages around 23°C (73°F) and a maximum of 33°C (92°F), alongside a relatively lower precipitation of 76 mm (3.0 in) over ten days. In contrast, March is notably colder, with averages around 3°C (38°F), dipping to a minimum of -12°C (11°F), and although it experiences higher rainfall at 102 mm (4.0 in) over the same number of days, it comes with higher humidity at 82%. For a detailed look at what to expect in March, check out Boston weather in March.
In comparing the weather of August and April, significant differences emerge in both temperature and precipitation patterns. August typically brings warmer conditions, with average temperatures ranging from a minimum of 13°C (56°F) to a maximum of 33°C (92°F), while April experiences much cooler temperatures, with averages between -2°C (28°F) and 27°C (81°F). Additionally, April tends to be wetter, receiving 135 mm (5.3 in) of precipitation over 13 days compared to August's 76 mm (3.0 in) over 10 days. Humidity levels are also higher in April at 80%, compared to August's 66%. For more detailed information about April weather, you can check Boston weather in April.
In comparing the weather between August and May, temperatures in August are generally warmer. August sees minimum temperatures of 13°C (56°F) and averages around 23°C (73°F), peaking at a maximum of 33°C (92°F). In contrast, May starts cooler, with minimums around 3°C (37°F) and average temperatures of 14°C (58°F), while still reaching up to 31°C (89°F). Precipitation is slightly lower in August at 76 mm (3.0 in) over 10 days, compared to May's 94 mm (3.7 in) over 12 days. Additionally, humidity levels in August are slightly lower at 66%, whereas May experiences higher humidity at 72%. For more details on the climate in May, you can check Boston weather in May.
When comparing the weather in June and August, it's evident that both months share similar maximum temperatures, reaching up to 33°C (92°F). However, June offers a cooler overall experience with an average temperature of 19°C (67°F) compared to August's warmer average of 23°C (73°F). In terms of precipitation, June is slightly wetter with 86 mm (3.4 in) compared to August's 76 mm (3.0 in), although both months experience rainfall on about 10 days. Additionally, humidity is higher in June at 72%, compared to 66% in August, making June feel a bit more humid. For a deeper dive into June weather specifics, you can check out Boston weather in June.
In comparing the weather of July and August, we see some distinct similarities and differences. Both months feature an average temperature of around 23°C (73°F), but July typically experiences slightly warmer extremes, with maximum temperatures reaching 34°C (94°F) compared to August's 33°C (92°F). While July has higher precipitation levels, with 115 mm (4.5 in) over 12 days, August sees a decrease in rainfall to 76 mm (3.0 in) over 10 days, resulting in drier conditions. Humidity remains relatively consistent, with July at 67% and August slightly lower at 66%. For a detailed look at the conditions in July, you can check out Boston weather in July.
In August, the weather is generally warmer with average temperatures around 23°C (73°F) and a maximum of 33°C (92°F), while September sees a noticeable drop in average temperature to 19°C (67°F) and a minimum of 7°C (46°F). Both months experience similar maximum temperatures, but August has a slightly lower humidity level at 66% compared to September’s 71%. Additionally, September experiences more precipitation, totaling 92 mm (3.6 in) over 8 days, compared to August's 76 mm (3.0 in) over 10 days. For more detailed information, check out Boston weather in September.
August weather is characterized by warm temperatures, with averages around 23°C (73°F) and maximums reaching up to 33°C (92°F). The month sees about 76 mm of precipitation spread over 10 days, along with a humidity level of 66%. In contrast, October experiences a significant drop in temperatures, averaging 14°C (57°F) with maximums of 27°C (81°F) and minimums plummeting to 0°C (33°F). Precipitation increases to 149 mm over 12 days, and humidity rises to 78%. For a deeper understanding of October conditions, check out Boston weather in October.
In August, the weather is warm and humid, with average temperatures around 23°C (73°F) and maximums reaching up to 33°C (92°F). With 76 mm (3.0 in) of precipitation over about 10 days, it's a month characterized by summer storms and high humidity at 66%. In contrast, November brings a significant drop in temperature, averaging around 7°C (44°F), with minimums plummeting to -10°C (14°F) and maximums reaching only 22°C (72°F). The month also experiences slightly higher precipitation at 100 mm (3.9 in), coupled with increased humidity at 84%. For more detailed information, check out Boston weather in November.
August and December present stark contrasts in weather. In August, temperatures range from a mild 13°C (56°F) to a hot 33°C (92°F), averaging around 23°C (73°F), paired with a moderate humidity of 66%. The month experiences 76 mm (3.0 in) of precipitation over about 10 days, making for a warm and often humid atmosphere. In contrast, December brings a dramatic drop in temperatures, with lows plummeting to -16°C (3°F) and highs reaching only 17°C (62°F), averaging just 2°C (36°F). The month is wetter, with 124 mm (4.9 in) of precipitation also spread across 10 days, and a higher humidity of 81%. For more details about what to expect in Boston during this chilly month, check out Boston weather in December.
August in Boston brings a vibrant and warm atmosphere that sets it apart from the cooler months. With temperatures often reaching into the low 30s°C (low 90s°F), this month is characterized by its balmy days and pleasant evenings. While the humidity levels hover around 66%, they can add a touch of discomfort, making the summer heat feel more intense. The occasional showers, with about 76 mm of precipitation over 10 days, offer a refreshing respite from the sun. Compared to the brisk winters and mild springs, August is a time when Boston truly basks in the warmth, inviting both locals and tourists to explore the city's outdoor activities and vibrant culture. For more insights into the city's weather patterns, check out Boston Climate.