Saint John
United States Virgin Islands, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Saint John, VI

Beautiful scenery with green vegetation, and the vast blue water around the islands in St John, a cloudy and sunny sky with a great beach scene
Beautiful scenery with green vegetation, and the vast blue water around the islands in St John, a cloudy and sunny sky with a great beach scene
August, the last month of the summer, in Saint John, is another hot month, with average temperature varying between 87.8°F (31°C) and 75.2°F (24°C).

Temperature

August and September, with an average high-temperature of 87.8°F (31°C), are the warmest months.

Rainfall

In Saint John, during August, the rain falls for 14 days and regularly aggregates up to 4.9" (124mm) of precipitation. In Saint John, United States Virgin Islands, during the entire year, the rain falls for 156 days and collects up to 49.7" (1262mm) of precipitation.

Ocean temperature

In Saint John, the average seawater temperature in August is 82.4°F (28°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In August, the average length of the day in Saint John is 12.7h.

Sunshine

Months with the most sunshine in Saint John are March, April, July and August, with an average of 9h of sunshine.

UV index

Months with the highest UV index in Saint John are March through September, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV rays for the ordinary person.
The daily maximum UV index of 12 interpret into the following advice:
Take all necessary precautions, as unprotected skin can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the warmest month in Saint John?

Warmest months in Saint John, United States Virgin Islands, are August and September, with an average high-temperature of 87.8°F (31°C).

What is the temperature in August in Saint John?

The average high-temperature, in August, in Saint John, United States Virgin Islands, is 87.8°F (31°C), while the average low-temperature is 75.2°F (24°C).

How much does it rain in Saint John in August?

In Saint John, United States Virgin Islands, during August, the rain falls for 14 days and regularly aggregates up to 4.9" (124mm) of precipitation.

What is the water temperature in August in Saint John?

In Saint John, United States Virgin Islands, in August, the average water temperature is 82.4°F (28°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Saint John have in August?

The average length of the day in August is 12.7h.

What is the month with the most sunshine in Saint John?

Months with the most sunshine in Saint John, United States Virgin Islands, are March, April, July and August, with an average of 9h of sunshine.

How many hours of sunshine does Saint John have in August?

In Saint John, the average sunshine in August is 9h.

What is the month with the highest UV index in Saint John?

Months with the highest UV index in Saint John, United States Virgin Islands, are March through September, with an average maximum UV index of 12.

What is the UV index reading in August in Saint John?

In August, the average daily maximum UV index in Saint John, United States Virgin Islands, is 12. A UV Index reading of 11, and higher, represents an ultimate hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in August - Saint John, VI
  • Average high temperature in August: 88°F

Warmest months (with the highest average high temperature) are August and September (88°F).
Months with the lowest average high temperature are January, February, March and December (82°F).

  • Average low temperature in August: 75°F

Months with the highest average low temperature are June, July, August, September and October (75°F).
Coldest months (with the lowest average low temperature) are January, February and March (70°F).

Average rainfall in August - Saint John, VI
  • Average rainfall in August: 4.9"

Wettest months (with the highest rainfall) are October and November (6.3").
The driest month (with the lowest rainfall) is February (2.1").

Average rainfall days in August - Saint John, VI
  • Average rainfall days in August: 14 days

Months with the highest number of rainy days are September and October (16 days).
The month with the lowest number of rainy days is April (9 days).

Average sea temperature in August - Saint John, VI
  • Average sea temperature in August: 82°F

Best months for swimming (with the highest average sea temperature) are September and October (84°F).
Coldest months (with the lowest average sea temperature) are January, February, March and April (79°F).

Average daylight in August / Average sunshine in August - Saint John, VI
  • Average daylight in August: 12.7h

The month with the longest days is June (Average daylight: 13.2h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in August: 9h

Months with most sunshine are March, April, July and August (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 7).

Average UV index in August - Saint John, VI
  • Average UV index in August: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).