Costa Rica

Caribbean Region

This zone encompasses the entire Caribbean coast including Puerto Viejo, Cahuita, Limon, Siquirres, Guapiles and Tortuguero. 

There is no defined dry season in this region. The least rainy months tend to be February/March and September/October. On average, this zone receives 141 inches of rain, with the rainiest months being July, November and December. Once again, despite all this rain, there are usually some hours of sun to be found.  All months have at least four to five hours of sun daily except July, the cloudiest and rainiest month of the year. March and April are the sunniest months with more than five to six hours of sun per day. Again, mornings are clear with afternoon or evening storms moving in at night. 

Temperatures are relatively constant all year ranging from 77 to 81°F on average. May, June and October are the warmest months with average daily highs of 88°F and the coolest day time temperatures are found during January, February, July and December, with an average of 84°F.  Days are blessed with trade winds that help buffer the high humidity.  Night-time temperatures range from 68- 71°F and are usually cool and comfortable. 

The Caribbean zone is the most humid zone in Costa Rica.  Humidity values are fairly constant throughout the year. March and April tend to be least humid months at 84%, while the rest of the year experiences averages between 87 and 90%.  June, July, November and December are the most humid with values reaching 90% (these are also the rainiest months). 

 Guapiles

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	82	28	65	19	10.77	276	85
Feb.	82	28	66	19	9.3	238	85
Mar.	83	29	67	19	8.4	215	85
Apr.	84	29	68	20	9.42	242	86
May	85	30	70	21	16.79	430	88
Jun.	85	29	70	21	17.3	444	89
Jul.	83	29	70	21	19.88	510	90
Aug.	84	29	69	21	18.51	475	89
Sep.	85	29	69	21	14.66	376	88
Oct.	84	29	69	21	17.47	448	89
Nov.	83	28	69	20	18.37	471	89
Dec.	82	28	67	20	17.62	452	87

Limon

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	88	31	68	20	12.48	317	87
Feb.	88	31	68	20	8.31	211	87
Mar.	87	31	69	21	9.21	234	85
Apr.	87	31	71	22	10.87	276	85
May	87	31	71	22	11.1	282	87
Jun.	87	31	71	22	11.65	296	88
Jul.	88	31	71	22	16.81	427	89
Aug.	68	20	71	22	12.28	312	88
Sep.	87	31	71	22	5.71	145	87
Oct.	87	31	71	22	8.11	206	87
Nov.	85	29	69	21	15.39	391	89
Dec.	88	31	69	21	17.52	445	88

Sixaola

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	87	31	69	21	7.06	180.9	n/a
Feb.	84	29	68	20	5.97	153.1	n/a
Mar.	86	30	70	21	7	179.4	n/a
Apr.	87	30	70	21	9.66	247.6	n/a
May	88	31	73	23	10.04	257.4	n/a
Jun.	86	30	71	22	7.6	194.9	n/a
Jul.	87	31	72	22	10.65	273.1	n/a
Aug.	88	31	73	23	10.1	258.9	n/a
Sep.	89	31	72	22	5.78	148.1	n/a
Oct.	88	31	71	22	6.5	166.7	n/a
Nov.	87	30	71	22	8.24	211.2	n/a
Dec.	85	30	70	21	12.88	330.2	n/a

Tortuguero

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	88	31	68	20	12.48	317	n/a
Feb.	88	31	68	20	8.31	211	n/a
Mar.	87	31	59	15	8.03	204	n/a
Apr.	87	31	71	22	10.87	276	n/a
May	87	31	71	22	11.1	282	n/a
Jun.	87	31	71	22	11.65	296	n/a
Jul.	88	31	71	22	16.81	427	n/a
Aug.	86	30	71	22	12.28	312	n/a
Sep.	87	31	71	22	5.71	145	n/a
Oct.	87	31	71	22	8.19	208	n/a
Nov.	85	29	69	21	15.39	391	n/a
Dec.	88	31	69	21	17.56	446	n/a

Source: National Weather Services of Costa Rica