Measurements:
°C
°F
CURRENT WEATHER
18:39
Alajuela
68°F
SW 1 mph
Feels like: 68°F
Precip: 89%
World Resorts Costa Rica Alajuela Weather

7 Day Weather Forecast

09.28
mon
DAY
78°F
NE 5 mph
precip
64%
NIGHT
68°F
SW 2 mph
precip
38%
09.29
tue
DAY
80°F
E 4 mph
precip
61%
NIGHT
68°F
SW 1 mph
precip
44%
09.30
wed
DAY
78°F
NE 4 mph
precip
64%
NIGHT
66°F
SW 2 mph
precip
20%
10.01
thu
DAY
82°F
NE 6 mph
precip
18%
NIGHT
68°F
SW 1 mph
precip
45%
10.02
fri
DAY
76°F
NE 4 mph
precip
75%
NIGHT
68°F
SW 2 mph
precip
58%
10.03
sat
DAY
78°F
E 4 mph
precip
73%
NIGHT
70°F
NW 2 mph
precip
50%
10.04
sun
DAY
80°F
E 3 mph
precip
70%
NIGHT
68°F
W 1 mph
precip
79%

Alajuela Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Alajuela was 30.2°F. The maximum and minimum values were 29.9°F and 30.5°F respectively.

Alajuela on the Weather Map

Best Time to Visit Alajuela
The most sunny months:
February 16 days
March 16 days
January 15 days
The most warm months:
March 87.3 °F
April 86.3 °F
February 85.5 °F
Warmest sea temperature:
April 89.1 °F
May 88.9 °F
March 88.6 °F
The most cold months:
October 78.7 °F
November 78.8 °F
September 80.0 °F
The most rainy months:
October 25 days
June 24 days
September 24 days
The most windy months:
February 6 mph
January 6 mph
March 6 mph
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