August weather forecastSaint John, VI

Beautiful scenery with green vegetation and the vast blue water around the islands in St John, Virgin IslandsBeautiful scenery with green vegetation and the vast blue water around the islands in St John, Virgin Islands

August

Weather in August

August moves in with similar weather conditions to July, maintaining a warm and humid climate in Saint John. The tropical city welcomes visitors seeking the warm waters and abundant sunshine during this summertime. August does ramp up its rainfall, reaching 4.9" (124mm). This spike in rain showers lends a distinct monsoon touch to the month, adding to its tropical allure.

Temperature

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

Rainfall

In Saint John, during August, the rain falls for 14 days and regularly aggregates up to 4.88" (124mm) of precipitation. In Saint John, during the entire year, the rain falls for 156 days and collects up to 49.69" (1262mm) of precipitation.

Ocean temperature

In August, the average ocean temperature is 82.4°F (28°C).
Note: Water surface temperatures from 77°F (25°C) to 84.2°F (29°C) are considered optimal and extremely delightful for long-lasting pleasure in any water activity.

Daylight

The average length of the day in August in Saint John is 12h and 44min.
On the first day of the month, sunrise is at 5:57 am and sunset at 6:53 pm. On the last day of August, sunrise is at 6:04 am and sunset at 6:33 pm AST.

Sunshine

The months with the most sunshine are March, April, July and August, with an average of 9h of sunshine.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an extreme health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 12 in August transforms into the following instructions:
Enforce all necessary safety measures, unprotected skin may suffer burns swiftly. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Directly after swimming or an outdoor workout, generously apply and reapply a broad-spectrum SPF 30+ sunscreen. Be on guard! The reflective nature of sand and water boosts UV exposure.

Frequently asked questions

The warmest period falls in August and September, when the average high-temperature reaches 87.8°F (31°C).

August temperatures in Saint John, United States Virgin Islands, vary between a high-temperature of 87.8°F (31°C) and a low-temperature of 75.2°F (24°C).

In August, the rain falls for 14 days. Throughout August, 4.88" (124mm) of precipitation is accumulated.

In Saint John, United States Virgin Islands, the average seawater temperature in August is 82.4°F (28°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

The average day length in August is 12h and 44min.

In August, on the first day of the month, sunrise is at 5:57 am and sunset at 6:53 pm. On the last day of the month, sunrise is at 6:04 am and sunset at 6:33 pm AST.

The months with the most sunshine are March, April, July and August, with an average of 9h of sunshine.

The average sunshine duration in August is 9h.

The months with the highest UV index are March through September, with an average maximum UV index of 12.

In August, the average daily maximum UV index is 12. A UV Index of 11, and more, symbolizes an extreme health vulnerability from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average rainfall
Average rainfall days
Average sea temperature
Average sunshine
Average UV index

Average temperature in August
Saint John, VI

  • Average high temperature in August: 88°F

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

  • Average low temperature in August: 75°F

The months with the highest average low temperature are June, July, August, September and October (75°F).
The 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"

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

Average rainfall days in August
Saint John, VI

  • Average rainfall days in August: 14 days

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

Average sea temperature in August
Saint John, VI

  • Average sea temperature in August: 82°F

The best months for swimming (with the highest average sea temperature) are September and October (84°F).
The 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: 12h and 42min

The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).

  • Average sunshine in August: 9h

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

Average UV index in August
Saint John, VI

  • Average UV index in August: 12

The 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).