August Weather in Nantucket, United States

Last updated: February 24, 2025

In August, Nantucket experiences mild temperatures, with a maximum of 24°C (76°F) and an average of 21°C (70°F), while cooling down to a pleasant minimum of 16°C (62°F). The month sees about 98 mm (3.9 in) of precipitation, spread across 8 days, contributing to the island’s lush landscapes. With humidity levels hovering around 76%, visitors can expect a comfortable yet slightly humid environment, perfect for enjoying the charming coastal activities and vibrant natural scenery that this iconic destination has to offer.

August Temperature in Nantucket

In August, Nantucket basks in the height of summer, with temperatures reflecting the season’s warmth. The minimum temperature sits comfortably at 16°C (62°F), while the average reaches a pleasant 21°C (70°F), and the highs can climb to a balmy 24°C (76°F). This warm embrace in August marks a continuation of the upward trend from earlier months, seamlessly following July’s similar warm patterns. The milder evenings and sunny days create an ideal backdrop for outdoor activities, making it a popular time for visitors to enjoy the island's stunning beaches and vibrant atmosphere before the transition to the cooler autumn months ahead.

August Weather in Nantucket: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Nantucket, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec373739455160676966595042
Data source: Temperature data for Nantucket generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Nantucket

In August, Nantucket experiences a moderate precipitation level, with 98 mm (3.9 in) of rain falling over 8 days. This amount reflects a slight uptick following the drier months of June and July, which recorded 83 mm (3.2 in) and 64 mm (2.5 in) respectively, indicating a trend towards increased moisture as summer progresses. With September approaching, the precipitation is expected to rise further, consistent with the pattern observed in previous years, where the late summer often ushers in heavier showers. Overall, August serves as a transitional month, balancing between the summer dryness and the wetter conditions that characterize the fall season.

August Precipitation Trends in Nantucket

The chart displays monthly precipitation patterns in Nantucket, with values for each month alongside August's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec96127114127130836498122162115132
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Nantucket

In August, Nantucket experiences a humidity level of 76%, mirroring the slightly lower humidity levels of July and September. This month typically marks a transition in the summer climate, reflecting a gradual decline from the peak seaside humidity of 84% in February and January. As the summer progresses, humidity generally decreases from its early high, indicating a shift towards drier conditions in the late summer and fall. With August's humidity somewhat balanced, it provides a comfortable atmosphere for beachgoers while hinting at the forthcoming seasonal changes. Overall, Nantucket's humidity patterns illustrate a compelling rhythm throughout the year, with the peak summer months offering a blend of warmth and refreshing sea breezes.

August Average Humidity in Nantucket

This chart illustrates the average monthly humidity levels in Nantucket, with August's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how August's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Nantucket

In August, Nantucket experiences a UV Index of 9, categorized as very high, meaning sun exposure can lead to skin damage in just 15 minutes. This peak intensity, while slightly lower than July's maximum of 10, reinforces a trend of escalating UV levels during the summer months, with May through August consistently marked as very high. Notably, as the summer wanes, September still holds a significant UV Index of 8, suggesting that vigilance is essential even as fall approaches. For detailed information on UV exposure throughout the year, visit Nantucket UV Index.

Maximum UV Index Levels in Nantucket for August

The chart shows the monthly maximum UV Index (UVI) for Nantucket in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Nantucket August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

August Sunshine in Nantucket

As August unfolds in Nantucket, the island basks in an impressive 327 hours of sunshine, maintaining its vibrant summer glow. This peak follows the sunniest months of July and June, which saw 342 and 319 hours, respectively, capturing the essence of a quintessential New England summer. While the sunshine begins to wane in September, dropping to 278 hours, August stands out as a capstone to the sun-soaked season, inviting visitors to revel in the warmth before autumn's embrace. The gradual decline from the early summer highs hints at the transition, yet August still offers a bountiful taste of sunshine, perfect for seaside strolls and evening gatherings under the stars.

Monthly Sunshine Duration in Nantucket: August Highlighted

The August sunshine duration represents the total number of hours Nantucket experiences direct sunlight during the month of August, excluding cloudy or obstructed periods. This chart compares the sunshine duration of August with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec134h174h256h244h299h319h342h327h278h238h200h156h
Data source: Nantucket August Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Nantucket During August

In Nantucket, August offers a 39% chance of sunny weather, making it one of the more moderate months for clear skies. While this figure is slightly below the peaks seen in the early spring, specifically March at 56%, it stands in contrast to the sunnier days of September, which boasts a 55% chance. The data reveals a clear trend: as summer progresses from June's 37% to July's 42%, the likelihood of sun slightly improves, only to dip again in August. This fluctuation suggests that while August provides decent chances for sunshine, visitors may want to be prepared for the occasional gloomy day, particularly as the season transitions towards fall when sunny conditions become more favorable.

Percentage of Sunny Days in August in Nantucket

The chart illustrates the percentage of sunny days in Nantucket throughout the year, with August highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Nantucket experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec36%27%56%47%43%37%42%39%55%46%51%27%
Data source: Nantucket August chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Nantucket in August

In August, Nantucket enjoys a generous 13 hours of daylight, marking a slight decline from the peak of 15 hours experienced in June. This gradual tapering signals the onset of late summer, where longer days gradually give way to the cozy warmth of early autumn. As the month unfolds, the sunlight becomes a little softer, inviting both residents and visitors to savor the lingering beauty of summer evenings. Following August, Nantucket will transition into September, which offers a shorter 12 hours of daylight, reminding us of the cyclical nature of seasons and the changing rhythm of life on this charming island.

Average Daylight Hours in Nantucket for August

The chart illustrates the variation in daylight duration in Nantucket throughout the year, with August highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 34m10h 37m11h 58m13h 20m14h 30m15h 5m14h 46m13h 44m12h 24m11h 2m9h 50m9h 14m
Data source: Nantucket daylight hours, calculated by summing the hours between sunrise and sunset for each day.

August Winds in Nantucket

In Nantucket, August brings a gentle breeze, with average wind speeds dipping to 5.2 m/s (12 mph). This marks a noticeable decline from the earlier months, particularly from the spring and early summer, where winds were more robust, averaging around 6.5 m/s (15 mph). As the peak summer heat settles in, the wind becomes a whisper compared to the more forceful gales of previous months. Interestingly, this trend of decreasing winds continues into September, before picking up again in the fall, where speeds average around 6.4 m/s (14 mph). Thus, August serves as a tranquil interlude in Nantucket's annual wind cycle, offering a serene atmosphere that complements the vibrant summer scenery.

Average August Wind Speed in Nantucket

The chart displays monthly wind speed patterns in Nantucket, with values for each month shown alongside August's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how August's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec8.28.07.97.56.66.55.45.2 m/s6.47.37.77.6
Data source: Nantucket August wind data, generated using information from the Copernicus Climate Change Service.

How August Weather in Nantucket Compares to Other Months

The weather in Nantucket 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 Nantucket and find detailed weather information for every month.

August and January present stark contrasts in weather conditions. In August, temperatures range from a mild 16°C (62°F) at night to a comfortable 24°C (76°F) during the day, accompanied by relatively high humidity at 76%. While precipitation is moderate at 98 mm (3.9 in) over about 8 days, the warmth creates a pleasant summer atmosphere. In sharp contrast, January sees frigid temperatures, with a minimum of -13°C (9°F) and an average of just 3°C (38°F), peaking at 13°C (55°F). This cold month experiences slightly less precipitation at 96 mm (3.8 in) across 10 days and higher humidity at 84%, making January a time of crisp, chilly air. For more detailed insights on winter conditions, check out Nantucket weather in January.

August and February present a stark contrast in weather conditions. In August, temperatures range from a mild 16°C (62°F) to a pleasant 24°C (76°F), accompanied by relatively lower precipitation of 98 mm (3.9 in) over about 8 days, making it a humid but enjoyable summer month with an average humidity of 76%. In contrast, February brings much colder temperatures, with lows dipping to -10°C (15°F) and highs reaching just 13°C (55°F). It is also wetter, with precipitation totals of 127 mm (5.0 in) spread across 13 days, and a higher average humidity of 84%. For more insights on February's weather, you can check Nantucket weather in February.

When comparing the weather in August and March, it's evident that these months present quite contrasting climates. August typically enjoys milder temperatures, with an average of 21°C (70°F) and maximums peaking at 24°C (76°F), while March is much cooler, featuring an average of only 4°C (39°F) and daytime highs reaching a mere 12°C (53°F). Precipitation levels are relatively close, with August receiving about 98 mm (3.9 inches) over 8 days, compared to March's 114 mm (4.5 inches) over 11 days. Additionally, humidity levels are higher in March at 82%, compared to 76% in August, indicating a more damp and chilly atmosphere during the early spring. For more details on March weather, visit Nantucket weather in March.

Comparing the weather in August and April reveals stark differences in temperature and precipitation. In August, the temperatures are much warmer, with minimums around 16°C (62°F) and averages peaking at 21°C (70°F), while in April, temperatures are significantly cooler, ranging from a minimum of 1°C (34°F) to an average of just 7°C (45°F). When it comes to precipitation, April experiences slightly more rainfall, totaling 127 mm (5.0 in) over about 12 days, compared to August’s 98 mm (3.9 in) spread across 8 days. Interestingly, both months have high humidity levels, with April at 79% and August at 76%. For a detailed look at the climate in April, you can visit Nantucket weather in April.

In comparing the weather conditions of May and August, a noticeable contrast in temperature is evident. August sees a warmer temperature range with minimums around 16°C (62°F) and averages reaching 21°C (70°F), while May is significantly cooler, with minimum temperatures of just 5°C (41°F) and average highs of 16°C (62°F). Precipitation in May is higher, totaling 130 mm (5.1 in) over 12 days, compared to August's 98 mm (3.9 in) over 8 days, indicating that May is typically a wetter month. Humidity levels remain similar, at 76% in August and 75% in May, which brings a consistent, moist feel to both months. For more detailed information on May weather, you can check Nantucket weather in May.

In comparing the weather between June and August, it's clear that August tends to be warmer and slightly wetter. August boasts an average temperature of 21°C (70°F), with a minimum of 16°C (62°F) and a maximum of 24°C (76°F), while June has a cooler average of 15°C (60°F), ranging from a minimum of 10°C (50°F) to a maximum of 21°C (70°F). Precipitation is a bit higher in August, with 98 mm (3.9 in) falling over about 8 days, compared to June's 83 mm (3.2 in) over 10 days. Additionally, humidity levels are similar, with August at 76% and June slightly higher at 78%. For more detailed insights, visit Nantucket weather in June.

Comparing the weather in August to July, we find that both months have similar maximum temperatures, peaking at 24°C (76°F). However, August tends to be slightly warmer on average, with a mean temperature of 21°C (70°F) compared to July's average of 20°C (67°F). Additionally, August experiences more rainfall, accumulating 98 mm (3.9 in) over 8 days, whereas July sees only 64 mm (2.5 in) of precipitation during the same number of days. Both months maintain a consistent humidity level of 76%. For more details, you can check out Nantucket weather in July.

August and September present a transition in weather patterns, with August typically being slightly warmer. In August, temperatures range from a minimum of 16°C (62°F) to a maximum of 24°C (76°F), while in September, the temperatures dip a bit, with a minimum of 13°C (56°F) and a maximum of 23°C (73°F). Precipitation also increases in September, with 122 mm (4.8 in) over 10 days, compared to August's 98 mm (3.9 in) over 8 days. Humidity remains fairly consistent between the two months, with August at 76% and September slightly lower at 75%. For more detailed insights, you can check Nantucket weather in September.

In August, temperatures are generally mild, with a minimum of 16°C (62°F) and an average of 21°C (70°F), reaching a maximum of 24°C (76°F). The month experiences a fair amount of rainfall, totaling 98 mm (3.9 in) over about 8 days, while humidity levels are relatively high at 76%. In contrast, October sees a notable drop in temperatures, with a minimum of just 5°C (41°F) and an average of 15°C (60°F), although the maximum can still reach 22°C (71°F). The precipitation also increases to 162 mm (6.4 in) over 12 days, accompanied by slightly lower humidity at 75%. For more detailed information about the weather, you can visit Nantucket weather in October.

In August, the weather is characterized by milder temperatures, with a minimum of 16°C (62°F) and an average of 21°C (70°F), peaking at a comfortable maximum of 24°C (76°F). The month sees a total precipitation of 98 mm (3.9 in) over about 8 days, combined with relatively high humidity levels at 76%. In contrast, November presents a notable shift, featuring cooler temperatures with a minimum of -5°C (24°F) and an average of 10°C (50°F), while the maximum temperature reaches 19°C (66°F). The precipitation increases slightly to 115 mm (4.5 in) spread over 10 days, alongside an incremental rise in humidity to 80%. For more detailed insights, you can check Nantucket weather in November.

August and December present markedly different weather patterns. In August, temperatures range from a mild 16°C (62°F) at night to a pleasant maximum of 24°C (76°F) during the day, with an average of 21°C (70°F). The month experiences a fair amount of humidity at 76% and 98 mm (3.9 in) of precipitation over 8 days. In contrast, December sees much colder conditions, with temperatures dipping as low as -9°C (16°F) and only reaching a maximum of 16°C (61°F), averaging just 5°C (42°F). This month is wetter, with 132 mm (5.2 in) of precipitation across 12 days and slightly higher humidity at 80%. For more specific insights on December weather, you can visit Nantucket weather in December.

Compare Nantucket's Climate with Cities Worldwide

Conclusion: What to Expect From August Weather in Nantucket

As August wraps up the summer season in Nantucket, temperatures soar with a delightful warmth, averaging around 21°C (70°F) and peaking at 24°C (76°F). This month stands out for its higher humidity levels, typically around 76%, adding a touch of coastal mugginess to the air. However, it also experiences a bit more rainfall with about 98 mm (3.9 in) spread over 8 days, contrasting with the drier months earlier in the season. For those seeking a balance of sun and sea, August offers an enticing blend that promises memorable experiences. To learn more about the overall weather patterns, check out Nantucket Climate.