Intellicast's Climate Guide To The Carribbean

Turquoise oceans, coconut trees, beautiful sandy beaches, reliably warm temperatures and the steady refreshing trade winds make the Caribbean islands a vacationer delight. Though the Caribbean Islands stretch over 15 degrees of latitude and 20 degrees of longitude, they have a rather similar climate throughout thanks to ocean waters that are warm throughout the year. The waters stay warm because of ocean currents that transport the warmth from the equatorial regions.

The best time of year weatherwise is the time when vacationers from the northern climates are most in need of some tropical sunshine and warmth, the winter months. The region is strongly influenced all through the year by the Atlantic subtropical high pressure belt. This brings a steady diet of northeasterly winds called the trade winds. In winter the high is close by and the result is sinking air and sunshine. In summer the high shifts north and the equatorial cloud and shower belt known as the Intertropical Convergence Zone shifts north. Daytime showers (brief but intense) are more frequent and tropical waves and storms moving westward in the trade wind belt bring occasional rainy periods and the risk of tropical storms and hurricanes. Hurricanes can bring very heavy rains and damaging winds. Most places get significant rains from spring and summer showers and the occasional tropical wave or storm every year, but may not get a direct hit from a strong hurricane for several years.

Islands that are mountainous see more showers in the summer on the northeast facing slopes where the moist trade winds are forced to climb. On the back (leeward - often southwest) side of the mountains, the weather is often drier. Unfortunately that side of the islands doesn't enjoy the benefits of the trade winds as much.

Temperatures are kept from extremes by the maritime influence. Temperatures over 100 are almost unheard of and readings below 60 are experienced only in extreme cold outbreaks and are usually restricted to Cuba or the northern Bahamas. Even then the air is much modified in transit over the warm water.

The wet season is May through October when these tropical waves and storms occur. The greatest risk of strong hurricanes is August and September. The dry season begins in December and continues until spring.

The best time for travelers to vacation in the Caribbean is the period from December through April, when the risk of hurricanes is low, rain is less frequent and temperatures are a bit more moderate. If you vacation in the other months, expect more heat and humidity and more frequent rains, and, be prepared for hurricanes.

NASSAU, THE BAHAMAS

Month
Record Low
Normal Low Normal High Record High Average Rainfall Average # Of Rain Days
January 41°F
5°C
65°F
18°C
77°F
25°C
85°F
29°C
1.4 inches
36 mm
6
February 43°F
6°C
64°F
18°C
77°F
25°C
86°F
30°C
1.5 inches
38 mm
5
March 46°F
8°C
66°F
19°C
79°F
26°C
88°F
31°C
1.4 inches
36 mm
5
April 53°F
12°C
69°F
21°C
81°F
27°C
91°F
33°C
2.5 inches
64 mm
6
May 53°F
12°C
71°F
22°C
84°F
29°C
92°F
33°C
4.6 inches
117 mm
9
June 62°F
17°C
74°F
23°C
87°F
31°C
94°F
34°C
6.4 inches
163 mm
12
July
67°F
19°C
75°F
24°C
88°F
31°C
94°F
34°C
5.8 inches
147 mm
14
August 67°F
19°C
76°F
24°C
89°F
32°C
94°F
34°C
5.3 inches
135 mm
14
September 65°F
18
°C
75°F
24°C
88°F
31°C
92°F
33°C
6.9 inches
175 mm
15
October 54°F
12°C
73°F
23°C
85°F
29°C
92°F
33°C
6.5 inches
165 mm
13
November 49°F
9°C
70°F
21°C
81°F
27°C
89°F
32°C
2.8 inches
71 mm
9
December 45°F
7°C
67°F
19°C
79°F
26°C
86°F
30°C
1.3 inches
33 mm
6

SAN JUAN, PUERTO RICO

Month
Record Low
Normal Low Normal High Record High Average Rainfall Average # Of Rain Days
January 63°F
17°C
70°F
21°C
80°F
27°C
88°F
31°C
4.3 inches
109mm
20
February 62°F
17°C
70°F
21°C
80°F
27°C
91°F
33°C
2.7 inches
69 mm
15
March 63°F
17°C
70°F
21°C
81°F
27°C
91°F
33°C
2.9 inches
74 mm
15
April 65°F
18°C
72°F
22°C
82°F
28°C
93°F
32°C
4.1 inches
104 mm
14
May 66°F
19°C
74°F
23°C
84°F
29°C
94°F
34°C
5.9 inches
150 mm
16
June 66°F
19°C
75°F
24°C
85°F
29°C
93°F
34°C
5.4 inches
137 mm
17
July
70°F
21 °C
75°F
24°C
85°F
29°C
92°F
33°C
5.7 inches
145 mm
19
August 68°F
20°C
76°F
24°C
85°F
29°C
93°F
34°C
6.3 inches
160 mm
20
September 63°F
17°C
75°F
24°C
86°F
30°C
94°F
34°C
6.2 inches
158 mm
18
October 69°F
21 °C
75°F
24°C
85°F
29°C
94°F
34°C
5.6 inches
142 mm
19
November 66°F
19 °C
73°F
23°C
84°F
29°C
93°F
34°C
6.3 inches
160 mm
19
December 62°F
17 °C
72°F
22°C
81°F
27°C
90°F
32°C
5.4 inches
137 mm
21
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