Saint John Island Weather: Your Guide to Sunshine and Tropical Climate

Dreaming of a Caribbean escape? Saint John Island, part of the U.S. Virgin Islands, offers idyllic beaches and lush landscapes. Understanding the Saint John Island Weather is key to planning your perfect trip. This guide provides a detailed look at the average weather conditions throughout the year, helping you decide the best time to visit this tropical paradise. Data is based on weather reports collected at Cyril E. King International Airport, approximately 25 kilometers from Saint John Island, from 1992 to 2021.

Average Weather Conditions in Saint John Island

Saint John Island boasts a warm, tropical climate year-round. Expect consistently high temperatures, balmy breezes, and varying levels of rainfall and humidity. Here’s a general overview of what to expect:

High Temperatures: Average highs hover around 32°C (90°F), providing plenty of sunshine for beach days.
Low Temperatures: Evenings remain pleasantly warm, with average lows around 23°C (73°F).
Mean Temperature: The average temperature settles at a comfortable 28°C (82°F) throughout the year.
Precipitation: Rainfall varies across the months, with an annual average of 96.3 mm.
Humidity: Expect tropical humidity levels, averaging around 72%.
Dew Point: The dew point typically sits at 22°C (72°F), contributing to the humid feel.
Wind: Consistent winds averaging 30 km/h (19 mph) help to temper the heat.
Pressure: Average atmospheric pressure is around 1016 hPa.
Visibility: Generally good visibility, averaging 20 km (12 miles).

Monthly Weather Breakdown for Saint John Island

To help you plan your visit, let’s delve into the specific saint john island weather averages for each month:

January Weather in Saint John Island

January offers some of the coolest temperatures, though still wonderfully warm.

High Temp: 29°C (84°F)
Low Temp: 23°C (73°F)
Mean Temp: 26°C (79°F)
Precipitation: 70.0 mm
Humidity: 72%
Dew Point: 21°C (70°F)
Wind: 30 km/h
Pressure: 1017 hPa
Visibility: 21 km

February Weather in Saint John Island

February mirrors January with similar comfortable conditions.

High Temp: 29°C (84°F)
Low Temp: 23°C (73°F)
Mean Temp: 26°C (79°F)
Precipitation: 54.8 mm
Humidity: 71%
Dew Point: 20°C (68°F)
Wind: 31 km/h
Pressure: 1017 hPa
Visibility: 21 km

March Weather in Saint John Island

March sees slightly decreasing humidity as the dry season continues.

High Temp: 29°C (84°F)
Low Temp: 23°C (73°F)
Mean Temp: 26°C (79°F)
Precipitation: 52.2 mm
Humidity: 70%
Dew Point: 20°C (68°F)
Wind: 31 km/h
Pressure: 1016 hPa
Visibility: 21 km

April Weather in Saint John Island

April marks a slight increase in temperatures as summer approaches.

High Temp: 30°C (86°F)
Low Temp: 24°C (75°F)
Mean Temp: 27°C (81°F)
Precipitation: 59.9 mm
Humidity: 71%
Dew Point: 21°C (70°F)
Wind: 30 km/h
Pressure: 1015 hPa
Visibility: 21 km

May Weather in Saint John Island

May brings warmer temperatures and increased humidity, signaling the transition to the wetter season.

High Temp: 31°C (88°F)
Low Temp: 25°C (77°F)
Mean Temp: 28°C (82°F)
Precipitation: 89.1 mm
Humidity: 73%
Dew Point: 23°C (73°F)
Wind: 31 km/h
Pressure: 1016 hPa
Visibility: 20 km

June Weather in Saint John Island

June is the start of the wetter months, with higher temperatures and humidity becoming more pronounced.

High Temp: 32°C (90°F)
Low Temp: 26°C (79°F)
Mean Temp: 29°C (84°F)
Precipitation: 77.0 mm
Humidity: 71%
Dew Point: 23°C (73°F)
Wind: 33 km/h
Pressure: 1017 hPa
Visibility: 19 km

July Weather in Saint John Island

July is among the hottest and windiest months in Saint John Island.

High Temp: 32°C (90°F)
Low Temp: 26°C (79°F)
Mean Temp: 29°C (84°F)
Precipitation: 99.0 mm
Humidity: 71%
Dew Point: 23°C (73°F)
Wind: 34 km/h
Pressure: 1017 hPa
Visibility: 18 km

August Weather in Saint John Island

August shares similar hot and humid conditions with July, remaining a peak summer month.

High Temp: 32°C (90°F)
Low Temp: 26°C (79°F)
Mean Temp: 29°C (84°F)
Precipitation: 116.8 mm
Humidity: 73%
Dew Point: 24°C (75°F)
Wind: 31 km/h
Pressure: 1015 hPa
Visibility: 18 km

September Weather in Saint John Island

September is the start of the wetter season, and often the month with the highest humidity.

High Temp: 32°C (90°F)
Low Temp: 26°C (79°F)
Mean Temp: 29°C (84°F)
Precipitation: 142.4 mm
Humidity: 75%
Dew Point: 24°C (75°F)
Wind: 26 km/h
Pressure: 1014 hPa
Visibility: 18 km

October Weather in Saint John Island

October typically sees the highest rainfall of the year in Saint John Island.

High Temp: 31°C (88°F)
Low Temp: 26°C (79°F)
Mean Temp: 28°C (82°F)
Precipitation: 151.7 mm
Humidity: 75%
Dew Point: 24°C (75°F)
Wind: 25 km/h
Pressure: 1013 hPa
Visibility: 20 km

November Weather in Saint John Island

November continues the trend of higher rainfall, marking the peak of the wet season.

High Temp: 30°C (86°F)
Low Temp: 25°C (77°F)
Mean Temp: 27°C (81°F)
Precipitation: 159.7 mm
Humidity: 75%
Dew Point: 23°C (73°F)
Wind: 26 km/h
Pressure: 1014 hPa
Visibility: 20 km

December Weather in Saint John Island

December sees a decrease in rainfall as the dry season begins to return, making it a popular time to visit.

High Temp: 30°C (86°F)
Low Temp: 24°C (75°F)
Mean Temp: 27°C (81°F)
Precipitation: 83.5 mm
Humidity: 73%
Dew Point: 21°C (70°F)
Wind: 30 km/h
Pressure: 1016 hPa
Visibility: 21 km

Quick Climate Summary for Saint John Island

For a quick overview, here are some climate highlights:


Hottest Month	August (29°C avg)
Coldest Month	January (26°C avg)
Wettest Month	November (159.7 mm avg)
Windiest Month	July (34 km/h avg)
Annual Precipitation	1156.1 mm per year

Planning Your Trip to Saint John Island Based on Weather

Knowing the saint john island weather patterns can significantly enhance your travel experience. If you prefer drier and slightly cooler weather, consider visiting between December and April. For those who don’t mind occasional rain and higher humidity, the summer and fall months still offer plenty of sunshine and warm seas, often with fewer crowds. No matter when you choose to visit, Saint John Island promises a beautiful tropical escape.