NOAA Atlas of Pilot Charts for Gulf of Mexico and Caribbean in July
Wind
Caribbean Sea
Easterly winds mostly Beaufort force 4 (11-16 knots) prevail this month, except forces 4-5 (11-21 knots) prevail over the central Caribbean north of Columbia. Over the southwestern Caribbean the wind will back east to northeast and diminish to forces 3-4 (7-16 knots) and over the northwestern Caribbean, winds tend to be from the east forces 3-4 (7-16 knots). There is a low (about 1%) risk for encountering gale wind forces 8-9 (34-47 knots) over the central Caribbean north of the Columbian coast during July.
Gulf of Mexico
East to southeast winds, mostly forces 3-4 (7-16 knots) prevail, except becoming more variable in direction forces 2-3 (4-12 knots) over the Northeast Gulf and southeast to south forces 3-4 (7-16 knots) over the Northwest Gulf.
Waves
Generally waves average 2-5 feet (0.5-1.5 meters), however, over the Central Caribbean 6-8 foot (2-2.5 meter) waves will prevail. The risk for rough seas of 8 feet (2.4 meters) or higher is less than 10% across the Gulf of Mexico, the northwestern and the easternmost Caribbean, however, the risk increases to 30-45% over the central Caribbean Sea, especially north of Columbia.
Temperature
Over the Gulf of Mexico air temperatures average around 82-84 F (28-29 C) over the Gulf of Mexico and 81-83 F (27-28.5 C) across the Caribbean.
Land Temperature
Overall, most Caribbean destinations see morning lows of 74-80 F (23-27 C) during July with daytime highs mostly 86-92 F (30-33 C). The hottest locations are Aruba, Cancun, Cozumel and the Caymans with afternoon high temperatures averaging at or above 90 F (32 C).
Tropical Cyclones
There is an increasing risk for tropical cyclone development during July with the highest risk (14%) occurring in the north-central Gulf of Mexico.
NOAA Pilot Chart Tropical Cyclone Frequency North Atlantic July
Rainfall
Rainfall during July varies quite a bit from 1.2 inches in Aruba to about 9.6 inches in Belize. The wettest locations include Belize, Bahamas, Trinidad, Dominica, St. Lucia and Martinique. Drier locations include Aruba and Curacao, Cancun, Montego. St. Maarten, and St. Thomas.
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