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

May 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
The last month of the spring, May, is another warm month in Saint John, United States Virgin Islands, with temperature in the range of an average high of 84.2°F (29°C) and an average low of 73.4°F (23°C).

Temperature

In Saint John, the average high-temperature in May remains equal as in April - a still warm 84.2°F (29°C). The average low-temperature, in Saint John, is 73.4°F (23°C).

Rainfall

In May, the rain falls for 12 days. Throughout May, 5.1" (129mm) of precipitation is accumulated. In Saint John, during the entire year, the rain falls for 156 days and collects up to 49.7" (1262mm) of precipitation.

Ocean temperature

In Saint John, in May, the average water temperature is 80.6°F (27°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.

Daylight

The average length of the day in Saint John, United States Virgin Islands, is 13h.

Sunshine

The average sunshine in May is 8h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an extreme threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
The average daily UV index of 12 in May transform into the following instructions:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in May in Saint John?

In Saint John, United States Virgin Islands, in May, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 73.4°F (23°C).

How much does it rain in Saint John in May?

In Saint John, United States Virgin Islands, during May, the rain falls for 12 days and regularly aggregates up to 5.1" (129mm) of precipitation.

What is the ocean temperature in May in Saint John?

In Saint John, the average seawater temperature in May is 80.6°F (27°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.

What is the average length of the day in May in Saint John?

In May, the average length of the day is 13h.

How long on average sun shines in May in Saint John?

In May, the average sunshine is 8h.

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

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

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

In Saint John, United States Virgin Islands, the average daily maximum UV index in May is 12. A UV Index of 11, and more, symbolizes an extreme health vulnerability from the exposure to the Sun's UV rays.
Average temperature in May - Saint John, VI
  • Average high temperature in May: 84°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 May: 73°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 May - Saint John, VI
  • Average rainfall in May: 5.1"

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 May - Saint John, VI
  • Average rainfall days in May: 12 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 May - Saint John, VI
  • Average sea temperature in May: 81°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 May / Average sunshine in May - Saint John, VI
  • Average daylight in May: 13h

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 May: 8h

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 May - Saint John, VI
  • Average UV index in May: 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).