Costa Rica

Central Pacific Region

The Central Pacific Weather Region includes the western parts of the San Jose and Puntarenas Provinces, extending south from the Tarcoles River to the mouth of the Baru River, which is just north of Dominical. This zone includes Jaco, Puntarenas, Quepos, Manuel Antonio and Parrita. 

This area has less continuity in climate than the other climatic regions we have discussed so far because it includes coastal and high mountainous regions (up to 6167 ft. above sea level).  Along the coast, average rainfall is 143 inches per year, but as you ascend into the mountains at 2559 ft. of altitude, the rainfall almost doubles to 262 inches of annual rain. 

The dry season here is from January to March, with February being the driest month. The rest of the year is technically the rainy season, October being the rainiest. There are typically five hours of sun during the rainy months, and eight hours of sun from January to April. The days begin sunny and pleasurable, with rains moving in during the afternoon or night. 

The average temperature on the coast is 81°F and 63°F up in the mountains. Average day time temperatures along the coast are at their highest between January and May, reaching 90°F, and generally, temperatures never drop below 71°F at night. Meanwhile, up in the mountains, the temperature can drop to 48°F. 

The relative humidity is relatively constant at 85%.  During January and February, it drops to between 75 and 80%, and reaches its peak of 90% in June, September and November. At least the hottest months do not coincide with the highest humidity levels. Winds from the south dominate the days, while the nights are usually calm with slight breezes from the east.

Jaco

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	88	31	72	22	0.59	16	n/a
Feb.	89	31	71	22	1.42	37	n/a
Mar.	90	32	73	23	0.39	10	n/a
Apr.	90	32	74	23	2.01	52	n/a
May	88	31	74	23	8.06	207	n/a
Jun.	87	31	73	23	17.47	448	n/a
Jul.	87	31	73	23	13.56	348	n/a
Aug.	87	31	73	23	10.12	260	n/a
Sep.	86	30	73	23	22.64	580	n/a
Oct.	86	30	73	23	21.84	560	n/a
Nov.	85	30	73	23	11.53	296	n/a
Dec.	87	31	72	22	7.18	184	n/a

Manuel Antonio

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	87	31	69	21	2.83	72	83
Feb.	87	31	69	21	1.42	36	81
Mar.	89	32	71	22	2.36	60	80
Apr.	89	32	71	22	6.57	167	84
May	89	32	71	22	15.43	392	87
Jun.	87	31	71	22	17.05	433	88
Jul.	87	31	69	21	18.15	461	88
Aug.	86	30	69	21	18.82	478	89
Sep.	86	30	71	22	20.79	528	90
Oct.	86	30	71	22	25.35	644	89
Nov.	86	30	71	22	15.28	388	89
Dec.	86	30	69	21	6.65	169	86

Puntarenas

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	96	36	71	22	0.28	7	74
Feb.	96	36	71	22	0.24	6	72
Mar.	95	35	73	23	0.2	5	72
Apr.	95	35	73	23	1.22	31	75
May	91	33	76	24	7.56	192	83
Jun.	89	32	73	23	8.98	228	86
Jul.	91	33	73	23	6.26	159	86
Aug.	91	33	73	23	9.02	229	86
Sep.	89	32	73	23	11.73	298	87
Oct.	89	32	73	23	10.75	273	87
Nov.	89	32	73	23	4.72	120	86
Dec.	91	33	71	22	1.18	30	80

Quepos

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	87	31	69	21	2.83	72	83
Feb.	87	31	69	21	1.42	36	81
Mar.	89	32	71	22	2.36	60	80
Apr.	89	32	71	22	6.57	167	84
May	89	32	71	22	15.43	392	87
Jun.	87	31	71	22	17.05	433	88
Jul.	87	31	69	21	18.15	461	88
Aug.	86	30	69	21	18.82	478	89
Sep.	86	30	71	22	20.79	528	90
Oct.	86	30	71	22	25.35	644	89
Nov.	86	30	71	22	15.28	388	89
Dec.	86	30	69	21	6.65	169	86

Source: National Weather Services of Costa Rica