During the week of 30 June 2025 - 6 July 2025, temperatures averaged at 30 °C (86 °F) during the day and dropped to 25 °C (77 °F) at night. These temperatures are roughly same as the long-time average for Saint Thomas, being 31 °C (88 °F) for daily temperatures and 24 °C (75 °F) for night temperatures. The average temperatures observed during different times of day (based on local time) were as below: 7am 26 °C (79 °F), 10am 29 °C (84 °F), 1pm 30 °C (86 °F), 4pm 29 °C (84 °F), 7pm 27 °C (81 °F), 10pm 26 °C (79 °F).

The week had 1 day without rain, 3 days with light rain and 3 days with moderate rain. Saint Thomas received 18 mm (0.71 in) of precipitation throughout the week, which is roughly same as its long-term average of 19 mm (0.75 in). From dawn to dusk, there was an average of 29 % cloud coverage during the day. The meteorological event(s) that occurred was: haze.

The wind's speed averaged 4.7 m/s. East and South-East were the dominant wind direction(s). The air pressure varied between 1016 hpa and 1020 hpa. The average air humidity was 76 % in Saint Thomas.

On average, there were 5 hours clear skies, 5.5 hours partially overcast skies, 1 hour overcast skies and 3 hours rainy weather during the daytime (from dawn to dusk). The sunrise on average occurred at 05:47, and the sunset occurred at 18:59.

Weather overview

Saint Thomas, located in the U.S. Virgin Islands, is characterized by its warm, tropical climate with consistent temperatures and an enticingly warm sea. Daily temperatures usually range between 28 °C (82 °F) in the cooler month of January to a peak of 31 °C (88 °F) in the warmest month of August. When the sun sets, the island cools slightly, with night temperatures varying from 21 °C (70 °F) in February to 24 °C (75 °F) in July. Moreover, sea temperatures are warmest in September, reaching 29 °C (84 °F), and cool to their lowest point at 26 °C (79 °F) in February. The island sees the least amount of rainfall in March, with only 8 days of precipitation, whereas the rainiest period is observed in November with 14 days. As you plan your visit, consider these climatic nuances to fully enjoy the island's natural beauty and offerings.

January weather

In Saint Thomas, the daytime temperature hits its minimal values while the sea temperature continues to decrease to 26 °C (79 °F). Compared to the previous month, there are fewer rainy days totaling 10 days, and a decrease in the amount of rainfall noted at 67 mm (2.65 in). The temperature at night continues its downward trend, recorded at 21 °C (70 °F). There's a noticeable start to an increase in sun hours, with 8 hours being cloud-free.

February weather

The lowest sea temperatures of the year can be felt this month in Saint Thomas, marking 26 °C (79 °F), while the nighttime temperatures also hit their lows. Rainfall has reduced to its minimal volume of 43 mm (1.70 in), coinciding with the decrease in the number of rainy days, recorded at 10 days. The number of sunny hours increases slightly to 8 hours.

March weather

In March, the quantity of rainy days in Saint Thomas is at its yearlong low, tallying 8 days, while the amount of rainfall begins to climb slightly, reaching 50 mm (1.97 in). The maximum number of sun hours is achieved at 9 hours, and the lowest humidity levels of the year are also observable this month.

April weather

The day temperature in Saint Thomas starts to ascend, with the sea temperature also witnessing a rise to 27 °C (80 °F). The number of rainy days begins to increase, and a surge in rainfall volume is observed, reaching 77 mm (3.01 in). The night temperature rises marginally.

May weather

In Saint Thomas, the sea temperature continues to rise to 27 °C (81 °F), alongside the noticeable increase in day temperature, now at 30 °C (85 °F). Rainy days are on the upswing, reported at 11 days, and the precipitation volume continues to rise, marked at 109 mm (4.30 in). Night temperatures are also climbing, while the number of sunny hours sees a slight decrease to 8 hours.

June weather

Daytime temperatures in Saint Thomas are increasing, with a new high of 30 °C (87 °F), and the sea temperature climbs to 28 °C (82 °F). The change to fewer rainy days begins, now at 10 days, while the rainfall volume decreases to 77 mm (3.05 in). The day length reaches its peak in June.

July weather

The upward trend of rainy days in Saint Thomas continues to 12 days, with an elevation in the amount of rainfall observed at 88 mm (3.45 in). The increase in the number of sunny hours is also noticeable. Night temperatures peak for the year, totalling 24 °C (75 °F). The highest wind speeds are recorded, averaging 5 m/s.

August weather

The number of rainy days in Saint Thomas keeps growing, now at 12 days, with rainfall also on the rise, documented at 101 mm (3.97 in). The acme of daytime temperatures is noted at 31 °C (88 °F).

September weather

In Saint Thomas, the climb in rainfall volume is perceptible at 119 mm (4.69 in). The number of sunny hours begins to withdraw to 8 hours, and the peak of the sea temperatures is marked at 29 °C (84 °F).

October weather

The number of rainy days in Saint Thomas rises to 13 days, correlating with the continued increase in rainfall volume at 130 mm (5.13 in). The wind speed reaches its lowest in October, while the highest humidity levels are also noticable in this month.

November weather

The descent in sea temperature begins in Saint Thomas, reaching 28 °C (82 °F), while the day temperature starts to drop this month. The highest number of rainy days are evidenced at 14 days, and the largest volume of rainfall is also quite apparent, with its measurement at 134 mm (5.29 in).

December weather

A downward trend in sea temperatures is observable in Saint Thomas, with day temperatures also on the decline, noted at 28 °C (83 °F). A reduction in the the number of rainy days can be seen, amounting to 13 days, and a decrease in rainfall is also evident in December. The night temperature dips in similarity to previous months.

How frequently does it rain in Saint Thomas during January?

In January, Saint Thomas experiences rain on about 10 days, with precipitations expected roughly 2.4 days per week or nearly 34 % of the time.

How would you describe February's climate in Saint Thomas?

February in Saint Thomas offers a mild climate with minimal rainfall occurring across approximately 10 days throughout the month.

Can I expect clear skies during my stay in March in Saint Thomas?

March in Saint Thomas typically brings the highest number of clear sun hours, averaging about 9 hours daily.

As the temperatures rise in Saint Thomas in April, how does it affect the amount of rainfall?

April sees a moderate increase in rainfall in Saint Thomas, amounting to 77 mm (3.01 in) as temperatures begin to warm.

What are the chances of getting wet during May in Saint Thomas?

May in Saint Thomas tends to have a heightened chance of rain with 11 days anticipating precipitation.

Is June typically a sunny month in Saint Thomas?

June in Saint Thomas enjoys extended daylight hours with decreased chances of rain, offering plentiful sunshine.

What is the likelihood of experiencing rain in Saint Thomas during July?

July in Saint Thomas presents a rising probability of rain, with an expectation that 12 days could see precipitation.

Can I look forward to warm weather if I visit Saint Thomas in August?

Visiting Saint Thomas in August, you can anticipate experiencing the zenith of daytime warmth the island has to offer.

With September seeing the warmest sea temperatures, is it a good time for swimming in Saint Thomas?

September is an excellent month for swimming in Saint Thomas, as sea temperatures hit their annual maximum.

Should I expect many rainy days in Saint Thomas during October?

The expectation for rain in Saint Thomas during October is high, with an average of 13 days likely to be wet.

What is the rain forecast like for November in Saint Thomas?

November is the wettest month in Saint Thomas with the most rain, tallying approximately 14 days of precipitation.

During December in Saint Thomas, should I be prepared for significant rainfall?

While December in Saint Thomas does indicate a reduction in rain, you can still expect a fair number of rainy days totaling 13 days.