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Northern Zone

Last Updated: Nov 08, 2011

arenal volcano view 
 - Costa Rica

This weather region includes all cities north of the Central Valley to the Nicaraguan border and Lake Nicaragua including Monteverde, Arenal, Ciuadad Quesada, and the northern part of Alajuela and Heredia Provinces.  

Altitude affects the quantity of rain received, but the rain patterns are the same between the lowlands and the mountains.  January through April are the driest months in both locations. Decreased humidity levels coincide with decreased rain and are at their lowest from March until April with an average of 75%. The rest of the year, relative humidity levels average 85% in both the lowlands and mountains. 

Temperatures are definitely affected by altitude. In the lowlands, daytime temperatures hover around 86°F whereas in the mountainous regions, daytime temperatures average 70°F.  Nights get quite cool in the mountains dropping to as low as 55°F, but only to 68°F in the lowlands. 

Winds are usually from the south averaging 3.4 mph throughout the year, but as you go up in elevation, wind speeds increase. Monteverde can be very windy during the dry season.

Arenal Volcano

MonthAverage HighsAverage LowsAverage RainfallHumidity
   FC  FC  in.  mm%
Jan. 83 28 68 20 7.48 192 n/a
Feb. 84 29 67 20 5.14 132 n/a
Mar. 86 30 69 20 3.58 92 n/a
Apr. 87 31 69 21 3.7 95 n/a
May 88 31 70 21 10.23 262 n/a
Jun. 86 30 71 22 16.15 414 n/a
Jul. 85 30 71 22 19.87 509 n/a
Aug. 85 30 72 22 17.05 437 n/a
Sep. 86 30 70 21 16.07 412 n/a
Oct. 85 30 70 21 16.98 435 n/a
Nov. 83 29 71 22 12 308 n/a
Dec. 82 28 70 21 10.1 259 n/a

Ciudad Quesada

MonthAverage HighsAverage LowsAverage RainfallHumidity
 FCFCin.mm%
Jan. 77 25 63 17 7 179 85
Feb. 76 25 62 17 6.36 163 83
Mar. 79 26 63 17 4.77 122 83
Apr. 80 27 63 17 3.33 85 84
May 80 27 66 19 13.3 341 90
Jun. 78 26 65 19 16.45 422 90
Jul. 77 25 66 19 18.71 480 92
Aug. 78 25 66 19 21.3 546 93
Sep. 78 25 66 19 19.68 505 93
Oct. 77 25 65 19 21.93 562 92
Nov. 75 24 65 18 14.93 383 91
Dec. 76 24 64 18 16.7 428 90

La Fortuna/Arenal

MonthAverage HighsAverage LowsAverage RainfallHumidity
 FCFCin.mm%
Jan. 83 28 68 20 7.48 192 n/a
Feb. 84 29 67 20 5.14 132 n/a
Mar. 86 30 69 20 3.58 92 n/a
Apr. 87 31 69 21 3.7 95 n/a
May 88 31 70 21 10.23 262 n/a
Jun. 86 30 71 22 16.15 414 n/a
Jul. 85 30 71 22 19.87 509 n/a
Aug. 85 30 72 22 17.05 437 n/a
Sep. 86 30 70 21 16.07 412 n/a
Oct. 85 30 70 21 16.98 435 n/a
Nov. 83 29 71 22 12 308 n/a
Dec. 82 28 70 21 10.1 259 n/a

Source: National Weather Services of Costa Rica

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