Measurements:
°C
°F
CURRENT WEATHER
17:56
San Jose
66°F
SW 2 mph
Feels like: 66°F
Precip: 80%
World Resorts Costa Rica San Jose Weather

7 Day Weather Forecast

09.28
mon
DAY
72°F
S 3 mph
precip
70%
NIGHT
62°F
W 2 mph
precip
39%
09.29
tue
DAY
72°F
S 4 mph
precip
70%
NIGHT
64°F
N 1 mph
precip
43%
09.30
wed
DAY
72°F
SE 3 mph
precip
69%
NIGHT
62°F
NW 2 mph
precip
20%
10.01
thu
DAY
74°F
SE 4 mph
precip
44%
NIGHT
64°F
N 1 mph
precip
80%
10.02
fri
DAY
70°F
S 2 mph
precip
78%
NIGHT
64°F
W 1 mph
precip
75%
10.03
sat
DAY
72°F
SW 3 mph
precip
75%
NIGHT
64°F
NE 2 mph
precip
55%
10.04
sun
DAY
72°F
S 3 mph
precip
69%
NIGHT
62°F
NE 2 mph
precip
68%

San Jose Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for San Jose was 30.3°F. The maximum and minimum values were 29.8°F and 30.8°F respectively.

San Jose on the Weather Map

Best Time to Visit San Jose
The most sunny months:
February 13 days
January 12 days
March 11 days
The most warm months:
March 83.2 °F
April 82.4 °F
February 81.5 °F
Warmest sea temperature:
April 89.7 °F
March 89.4 °F
May 89.1 °F
The most cold months:
November 76.1 °F
October 76.4 °F
September 77.3 °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 5 mph
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