August weather forecastOnset, MA
August
Weather in August
August, the last month of the summer in Onset, is another warm month, with an average temperature fluctuating between 75.2°F (24°C) and 66.7°F (19.3°C).Temperature
In Onset, August's average high-temperature stands at a still warm 75.2°F (24°C), closely related to the preceding month. During August's nights, Onset notes a minor temperature decline, reaching an average of 66.7°F (19.3°C).Humidity
In Onset, the average relative humidity in August is 79%.Rainfall
In Onset, in August, it is raining for 14.1 days, with typically 2.09" (53mm) of accumulated precipitation. Throughout the year, there are 157.4 rainfall days, and 32.2" (818mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Ocean temperature
With an average ocean temperature of 68.5°F (20.3°C), August is the month with the warmest seawater.Note: Swimming is not an enjoyable activity for the majority when the water is at 68.5°F (20.3°C). The difficulty of controlling breathing increases as the temperature dips from 69.8°F (21°C) to 59°F (15°C).
Daylight
In Onset, the average length of the day in August is 13h and 49min.On the first day of the month, sunrise is at 5:37 am and sunset at 8:00 pm. On the last day of August, sunrise is at 6:08 am and sunset at 7:17 pm EDT.
Sunshine
The month with the most sunshine is August, with an average of 10.7h of sunshine.UV index
The months with the highest UV index are July and August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 6 in August converts into the following recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Onset, MA
- Average high temperature in August: 75.2°F
The warmest month (with the highest average high temperature) is July (75.6°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in August: 66.7°F
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).
Average pressure in August
Onset, MA
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in August
Onset, MA
- Average wind speed in August: 8.7mph
The windiest month (with the highest average wind speed) is January (13.7mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).
Average humidity in August
Onset, MA
- Average humidity in August: 79%
The months with the highest relative humidity are June and July (81%).
The months with the lowest relative humidity are March and November (74%).
Average rainfall in August
Onset, MA
- Average rainfall in August: 2.09"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in August
Onset, MA
- Average rainfall days in August: 14.1 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (9 days).
Average snowfall in August
Onset, MA
- Average snowfall in August: 0"
The months with the highest snowfall are February and March (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in August
Onset, MA
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in August
Onset, MA
- Average sea temperature in August: 68.4°F
The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).
Average daylight in August /
Average sunshine in August
Onset, MA
- Average daylight in August: 13h and 48min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 10h and 42min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in August
Onset, MA
- Average sunshine days in August: 14.3 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is April (12.5 days).
Average UV index in August
Onset, MA
- Average UV index in August: 6
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in August
Onset, MA
- Average cloud cover in August: 28
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in August
Onset, MA
- Average visibility in August: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
