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Cartago weather in September

Weather in Cartago: September

Average day temperature: 71.7°F
Average night temperature: 60.4°F
Sea water temperature: 83.8°F
Number of sunny days: 1 day
Day length: 12.0 - 12.3 hours
Number of rainy days: 26 days
Precipitation totals: 21.9 in.

Air temperature in September, °F

Show year:
2025
2024
2023

The highest day temperature during September of 2025 was 73°F. At the same time the lowest night temperature was 55°F. Daily and nightly averages during September were 69.0°F and 58.1°F.

Sea water temperature in Cartago in September, °F

Show year:
2025
2024
2023

The average sea water temperature in September of 2025 was 83.9°F. The highest and lowest sea temperatures during the month were 84.6°F and 83.3°F.

Sunny, partly cloudy and cloudy days

Mostly all days in September are cloudy but sunny and partly cloudy days are also possible.

Precipitation total in September, in.

Precipitation total value in Cartago in September is 19.6 in. It makes september one of the most rainy months of the year.

Wind speed in September, mph

The average wind speed value in September is 2.4 mph It makes September one of the least windy months of the year.

Average sunny hours

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 3.9.

Best time for vacation in Cartago

Sunniest months:
February 12 days
January 10 days
March 10 days
Warmest months:
March 75.2 °F
April 74.8 °F
February 74.0 °F
Warmest sea temp:
April 85.7 °F
March 85.4 °F
May 85.1 °F
Coldest months:
November 70.5 °F
October 70.6 °F
December 71.4 °F
Rainiest months:
September 26 days
June 26 days
October 25 days
Windiest months:
February 5.2 mph
January 5.0 mph
March 4.6 mph

Cartago on a weather map

Cartago
+54°F
W 3 mph
Feels like: +54°F
Precip.: 0%
Places in Costa Rica:
Name
°F
+57°F
+77°F
+73°F
+72°F
+73°F
+73°F
+75°F
+54°F
+79°F
+75°F
+73°F
+57°F
24 Hours Forecast
Cartago
Local time: 00:25
December 05, friday
0300
54°F
W
3 mph
0600
54°F
W
3 mph
0900
70°F
SW
3 mph
1200
75°F
SW
4 mph
1500
70°F
S
2 mph
1800
57°F
W
2 mph
2100
54°F
W
3 mph
December 06, saturday
0000
54°F
NW
2 mph
Units of measurement: °C / °F