Cayman's temperature is quite typical for that of a 'Caribbean' island. Balmy warm days that cool off slightly at night with a light breeze blowing in from the Caribbean sea. There is a definite rainy season where locals can almost expect to be met with an afternoon shower over their lunch break like clockwork ... so remember to pack your umbrella!
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The most pleasant weather in Cayman is during the winter, from mid-November to April. During this time there is little rain, the skies are more clear than cloudy, and there is an almost constant cool sea breeze. These months also coincide with peak tourist season.
May to November is the rainy season, but unless there is a tropical depression sitting over Cayman, the rain is normally only heavy for a few hours and then stops for the rest of the day. It is not uncommon to have heavy rain in one part of town while it remains dry in another.
July 2021 was the world’s hottest month ever recorded, as US government scientists have confirmed, with the global land and ocean surface temperature one degree Celsius, 0.9C (1.6F), hotter than the 20th-century average of 15.8C (60.4F), making it the hottest month since modern record keeping began 142 years ago.
The Cayman Island's hottest month in 2021 was September with an average temperature of 30C/86F. August 2021 however, was Cayman's wettest month with 320.9mm of rain and an average humidity of 76%. It was also one of the cloudiest, with only one clear day of unbroken sunshine and 16 days of rain.
The coolest month in 2021 was January, with an average temperature of 79.7F/26.5C, with 12 partly cloudy days, 10 very cloudy days and 9 clear days. We had only 3 days of intermittent rain in January 2021.
Average Weather by Month in 2021
|Month||Avg. Temperature||Avg. Daytime Hours||Avg. Rainfall (millimeters)||Avg. Humidity (%)|
|January||79.7˚F or 26.5˚C||11.08||7.3||75|
|February||80.6˚F or 27˚C||11.33||38.3||72|
|March||78.5˚F or 25.8˚C||12.04||22.8||72|
|April||80.8˚F or 28.1˚C||12.38||25.6||71|
|May||83.8˚F or 28.8˚C||13.06||200.6||79|
|June||84.8F or 29.3˚C||13.2||132||77|
|July||85.7˚F or 29.8˚C||13.13||97.8||74|
|August||85.4˚F or 29.6˚C||12.49||320.9||76|
|September||86˚F or 30˚C||12.17||50.2||73|
|October||84.7˚F or 29.3˚C||11.44||217.9||76|
|November||81.4˚F or 27.5˚C||11.15||221.3||74|
|December||81.4˚F or 27.5˚C||11.01||30.3||75|
Thankfully Cayman’s last major hurricane was in September 2004. Hurricane Ivan, a category five storm, caused major infrastructural damage plus took two precious lives. However, in August 2021 Tropical Storm Grace, which passed 20 miles south of Grand Cayman and 94 miles from Cayman Brac at its closest point, became a Category 1 hurricane only after leaving our area and yet it caused a huge amount of destruction to our vegetation and trees. The Botanic Park reported having mature trees being snapped in half. So the Cayman Islands remains vigilant about hurricane preparedness. In this section you will also find everything about getting yourself and your household stocked and ready, as best you can, for a hurricane. It will also help explain where the hurricane shelters are located in Grand Cayman and which companies can sell you storm shutters for your home. Best to prepare before June 1st though as the supermarkets and hardware stores become a heaving mass of bodies when an approaching storm is announced.
We also discuss the fact that Cayman lies on the boundary of the Caribbean and North American tectonic plates, in an active transform boundary zone, which means that the tectonic plates are sliding past each other. This means that the area is known for the occasional earthquake and had a recent tsunami scare in January 2020. Being prepared and having a plan is essential. Make sure your family knows what to do in the event of a major earthquake occurring in the region.
Hurricanes are the most common natural disaster affecting the Cayman Islands. Learn how to prepare for a hurricane in the Cayman Islands.
Earthquakes and Tsunamis
Get information about the history of earthquakes and tsunamis in Cayman and what to do to prepare.
Waterspouts and Tornadoes
Waterspouts are often confused with tornadoes which are a very rare phenomenon for the Cayman Islands.
Emergency Alert System
Emergency Alert Systems have been developed in the Cayman Islands to provide the public with real-time alerts and notify them when a threat is declared.