In Jamaica the climate is tropical, hot all year round, with little difference between winter and summer (just a few degrees). Even in winter, daytime temperatures are around 27/30 °C (81/86 °F), and night-time temperatures around 20/23 °C (68/73 °F). The southern coast, where the capital Kingston is located, is slightly warmer in the winter months, so that the maximum temperature is around 30 °C (86 °F) even in January.
Here are the average temperatures of Kingston.
Average temperatures - Kingston

Kingston	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Kingston	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	21	21	22	23	24	24	24	24	24	23	23	22
Max (°C)	30	30	31	31	32	32	33	33	32	32	31	31
Min (°F)	70	70	72	73	75	75	75	75	75	73	73	72
Max (°F)	86	86	88	88	90	90	91	91	90	90	88	88

The main difference between the seasons is found in rainfall and air humidity: the rainy season, from late April to October, is hot and muggy. Rainfall occurs mainly in the form of thunderstorm in late afternoon. In almost all of Jamaica, except in the west coast (see Negril), in July there is a relative lull in precipitation, and in any case there are two peaks in May and October, that is, at the beginning and the end of the period.
The rain pattern is also related to the north-east trade winds, which are typical of the Tropics, and blow from November to March. Along the northern coast of Jamaica, rainfall ranges between 1,200 and 1,800 millimetres (47 and 70 inches) per year. The southern coasts and plains are less rainy than the northern slopes, because they are sheltered from the trade winds, by either the Blue Mountains or the hills of the west-central part of the country: these elevations receive a lot of rainfall and are covered by forests (especially the Blue Mountains in the east and the southern part of the Trelawny Parish in the west). Therefore, the capital Kingston is not very rainy, in fact it receives about 800 mm (31.5 in) of rain per year; the Pedro Plains in the west receive little rainfall as well, around 800 millimetres (31.5 inches) per year.
Here is the average precipitation in Kingston.
Average precipitation - Kingston

Kingston	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Kingston	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	20	20	20	40	100	75	40	100	115	175	65	45	815
Prec.(in)	0,8	0,8	0,8	1,6	3,9	3	1,6	3,9	4,5	6,9	2,6	1,8	32,1
Days	5	5	5	7	8	7	6	9	11	14	10	6	93

The amount of sunshine in Kingston is good even during the rainy season (when there are still around 8 hours of sunshine per day).
Sunshine - Kingston

Kingston	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Kingston	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	7	8	8	8	7	8	9	8	8	8	8	7

In the north coast, exposed to the northeast trade wind, the rainfall pattern is quite different, as you can see from the average precipitation of Ocho Rios. Here there is even a peak in the first months in which the trade winds blow, that is, in November and December, when the sea retains the heat of the summer.
Average precipitation - Ocho Rios

Ocho Rios	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Ocho Rios	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	150	120	75	110	165	110	80	100	120	190	250	205	1675
Prec.(in)	5,9	4,7	3	4,3	6,5	4,3	3,1	3,9	4,7	7,5	9,8	8,1	65,9
Days	7	6	6	7	12	12	13	13	14	16	10	8	124

From December to March, sometimes the island is affected by the Norte, a cool wind from the United States, which, however, at this latitude does not lower the temperature too much, in fact it can bring at most a bit of cool in the evening and at night.
Like the rest of the Caribbean, in the period from June to November, Jamaica can be affected by hurricanes, tropical cyclones of the Atlantic Ocean, which, however, are more likely between August and October.



For swimming, the sea is warm enough all year round, ranging from 27 °C (81 °F) from January to April, to 29 °C (84 °F) from July to November.
Sea temperature - Jamaica

Jamaica	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Jamaica	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	27	27	27	27	28	28	28	29	29	29	28	28
Sea (°F)	81	81	81	81	82	82	82	84	84	84	82	82

The best time to visit Jamaica as a whole, whether you intend to visit cities and make excursions, or to swim and sunbathe, runs from January to April. In fact, it is the period when the rains are more scarce, and the air is less hot. The absolute least rainy months are February and March, while December is still quite rainy in the easternmost region and in the northern slopes of the Blue Mountains (otherwise, in the south even December would be fine).
In summer, and generally during the rainy season, the heat is sweltering and annoying, but the breeze blows and there are also some hours of sunshine per day; in addition, in Kingston and on the southern coast, in July it usually does not rain much, so if you want to choose the summer, you can choose this month, also because the risk of hurricanes is lower than in August.


From November to April: light clothes, a sweatshirt for the evening; for the mountains, jacket and hiking boots. Sun hat, sunscreen.
From May to October, tropics-friendly, lightweight clothing, possibly a light sweatshirt and a light raincoat for thunderstorms; a sweatshirt or sweater for the mountains.