Costa Rica

North Pacific Region

The North Pacific Weather Region includes the Guanacaste Province, including Liberia and Tilaran, the cities of Orotina and San Mateo from the Alajuela Province and the northern part of the Province of Puntarenas from the river mouth of the Tarcoles River, north.  Also included in this region are: Playa del Coco, Playa Flamingo, Tamarindo, Nosara, Samara, Mal Pais and Montezuma. 

The average annual temperature in this climatic zone is 82°F, with the warmest month being April when temperatures can reach 100°F.  The rest of the year, daytime temperatures average 91°F.  The coolest nights are found between November and March, going down to an average of 66°F. 

The rainy season is clearly defined between the months of May through October, with the rainiest months being June, September and October. July tends to be the least rainy of the wet months. The rainy season has the highest relative humidity at 80 and 85% when compared to the rest of the year (only 60 to 65% humidity in the dry season).  Winds tend to be calm during the rainy season.  Despite all this rain there is still an average six hours of sun per day during the rainy season. 

November through April are the dry months, receiving almost no rain from December until March.  During the dry season and the el veranillo, winds tend to be predominately NE and max out at 7.5 mph.  Daytime temperatures hover around 89°-96°F with an average of ten hours of sunshine! 

Liberia

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	91	33	69	21	0.04	1	66
Feb.	95	35	69	21	0.04	1	64
Mar.	95	35	71	22	0.35	9	61
Apr.	96	36	73	23	0.87	22	63
May	93	34	79	26	9.25	235	74
Jun.	89	32	73	23	12.28	312	84
Jul.	89	32	73	23	5.28	134	80
Aug.	89	32	73	23	8.11	206	82
Sep.	87	31	71	22	12.8	325	86
Oct.	87	31	71	22	11.22	285	87
Nov.	87	31	89	32	4.09	104	81
Dec.	88	31	89	32	0.51	13	72

Nicoya

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	91	33	69	21	0.2	5	68
Feb.	93	34	71	22	0.43	11	63
Mar.	96	36	71	22	0.94	24	62
Apr.	96	36	73	23	2.72	69	64
May	91	33	73	23	10.79	274	78
Jun.	89	32	71	22	12.8	325	85
Jul.	89	32	71	22	9.61	244	81
Aug.	89	32	71	22	12.01	305	82
Sep.	87	31	71	22	15.71	399	87
Oct.	87	31	71	22	16.02	407	87
Nov.	87	31	69	21	12.44	316	81
Dec.	89	32	69	21	0.98	25	74

Santa Cruz

Month	Average Highs		Average Lows		Average Rainfall		Humidity
	F	C	F	C	in.	mm	%
Jan.	92	33	72	22	0.23	6	65
Feb.	93	34	73	23	0.13	3.3	62
Mar.	95	35	74	23	0.28	7.3	62
Apr.	97	36	75	24	1.2	30.7	66
May	94	34	74	23	9.36	240	74
Jun.	90	32	73	23	11.44	293.4	81
Jul.	90	32	73	23	7.31	187.5	81
Aug.	90	32	73	23	9.54	244.5	83
Sep.	90	32	72	22	13.37	342.8	83
Oct.	89	32	72	22	13.65	350.1	83
Nov.	90	32	71	22	3.83	98.2	78
Dec.	90	32	71	22	0.64	16.4	68

Source: National Weather Services of Costa Rica