Jamestown
Rhode Island, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Jamestown, RI

The last month of the summer, August, is another warm month in Jamestown, Rhode Island, with average temperature fluctuating between 65.7°F (18.7°C) and 77.7°F (25.4°C).

Temperature

In August, the average high-temperature is essentially the same as in July - a still warm 77.7°F (25.4°C). The average low-temperature, in Jamestown, is 65.7°F (18.7°C).

Humidity

In August, the average relative humidity is 78%.

Rainfall

In Jamestown, during August, the rain falls for 11.8 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Jamestown, during the entire year, the rain falls for 148.1 days and collects up to 29.65" (753mm) of precipitation.

Snowfall

April, June through October are months without snowfall.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 69.6°F (20.9°C).
Note: For most, swimming in 69.6°F (20.9°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

The average length of the day in August is 13.8h.

Sunshine

August has the most sunshine of the year, with an average of 10.5h of sunshine.

UV index

June through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: In August, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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.

What is the temperature in August in Jamestown?

In August, in Jamestown, Rhode Island, the average high-temperature is 77.7°F (25.4°C), and the average low-temperature is 65.7°F (18.7°C).

What is the average humidity in August in Jamestown?

In August, the average relative humidity in Jamestown is 78%.

How much does it rain in Jamestown in August?

In Jamestown, in August, during 11.8 rainfall days, 2.09" (53mm) of precipitation is typically accumulated.

When it does not snow in Jamestown?

In Jamestown snow does not fall in April, June through October.

When is the ocean warmest in Jamestown?

With an average ocean temperature of 69.6°F (20.9°C), August is the month with the warmest seawater in Jamestown.

What is the ocean temperature in August in Jamestown?

In Jamestown, in August, the average water temperature is 69.6°F (20.9°C). Swimming in 69.6°F (20.9°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

What is the average length of the day in August in Jamestown?

The average length of the day in August is 13.8h.

What month has the most sunshine in Jamestown?

The month with the most sunshine in Jamestown is August, with an average of 10.5h of sunshine.

How many hours of sunshine does Jamestown have in August?

In August, the average sunshine is 10.5h.

What are the months with the highest UV index in Jamestown?

June through August, with an average maximum UV index of 6, are months with the highest UV index in Jamestown, Rhode Island.

What is the UV index intensity in August in Jamestown?

The average daily maximum UV index in August in Jamestown, Rhode Island, is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV rays.
Average temperature in August - Jamestown, RI
  • Average high temperature in August: 77.7°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in August: 65.7°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

Average humidity in August - Jamestown, RI
  • Average humidity in August: 78%

The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is March (73%).

Average rainfall in August - Jamestown, RI
  • Average rainfall in August: 2.09"

The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the lowest rainfall) is September (1.42").

Average rainfall days in August - Jamestown, RI
  • Average rainfall days in August: 11.8 days

The month with the highest number of rainy days is April (15.6 days).
The month with the lowest number of rainy days is January (8.3 days).

Average snowfall in August - Jamestown, RI
  • Average snowfall in August: 0"

The month with the highest snowfall is February (2.76").
Months with the lowest snowfall are April, June, July, August, September and October (0").

Average snowfall days in August - Jamestown, RI
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (6.6 days).
Months with the lowest number of snowfall days are June, July, August, September and October (0 days).

Average sea temperature in August - Jamestown, RI
  • Average sea temperature in August: 69.6°F

The best month for swimming (with the highest average sea temperature) is August (69.6°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).

Average daylight in August / Average sunshine in August - Jamestown, RI
  • Average daylight in August: 13.8h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in August: 10.5h

The month with most sunshine is August (Average sunshine: 10.5h).
The month with least sunshine is February (Average sunshine: 4.8h).

Average UV index in August - Jamestown, RI
  • Average UV index in August: 6

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March and December (UV index 2).