Measurements:
°C
°F
CURRENT WEATHER
03:08
San Jose
60°F
W 2 mph
Feels like: 60°F
Precip: 38%
World Resorts Costa Rica San Jose Weather

7 Day Weather Forecast

09.07
mon
DAY
74°F
S 3 mph
precip
63%
NIGHT
62°F
SW 4 mph
precip
50%
09.08
tue
DAY
74°F
SW 6 mph
precip
42%
NIGHT
60°F
W 5 mph
precip
35%
09.09
wed
DAY
74°F
SW 6 mph
precip
44%
NIGHT
62°F
SW 5 mph
precip
43%
09.10
thu
DAY
74°F
SW 6 mph
precip
23%
NIGHT
60°F
W 4 mph
precip
31%
09.11
fri
DAY
72°F
SW 6 mph
precip
67%
NIGHT
62°F
W 3 mph
precip
38%
09.12
sat
DAY
72°F
SW 4 mph
precip
76%
NIGHT
62°F
W 2 mph
precip
37%
09.13
sun
DAY
74°F
SW 4 mph
precip
65%
NIGHT
62°F
W 1 mph
precip
66%

San Jose Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for San Jose was 28.8°F. The maximum and minimum values were 28.5°F and 29.1°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
July 77.6 °F
The most rainy months:
October 25 days
September 25 days
June 24 days
The most windy months:
February 6 mph
January 6 mph
March 5 mph
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