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Monthly climate in Coamo, Puerto Rico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Coamo features a tropical monsoon climate (Am). Temperatures typically range between 23 °C (75 °F) and 26 °C (80 °F) through the year, but rarely can drop to 18 °C (65 °F) or can rise to as high as 31 °C (87 °F). The average annual precipitation amounts to about 1018 mm (40.1 inches) and receives 224 rainy days on the 1 mm (0.04 inches) threshold annually. Coamo enjoys an average of 3923 hours of sunshine throughout the year, and daylight varies from 11 hours 3 minutes to 13 hours 10 minutes per day.

Monthly average temperatures in Coamo, Puerto Rico

The warmest months in Coamo are July, August and September, with daily mean temperatures ranging from 26 to 26 °C (80 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 23 to 24 °C (75 - 75 °F) throughout the day. On average each year, Coamo experiences 319 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Coamo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum27°C
(81°F)		27°C
(82°F)		27°C
(81°F)		28°C
(83°F)		29°C
(85°F)		29°C
(85°F)		30°C
(87°F)		31°C
(87°F)		30°C
(86°F)		30°C
(86°F)		29°C
(84°F)		28°C
(83°F)
Mean maximum27°C
(80°F)		27°C
(80°F)		27°C
(81°F)		27°C
(81°F)		28°C
(83°F)		29°C
(84°F)		29°C
(85°F)		30°C
(86°F)		30°C
(86°F)		29°C
(85°F)		28°C
(83°F)		28°C
(82°F)
Average high26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(80°F)		27°C
(81°F)		28°C
(82°F)		28°C
(83°F)		29°C
(84°F)		28°C
(83°F)		28°C
(82°F)		27°C
(81°F)		27°C
(80°F)
Daily mean24°C
(75°F)		23°C
(75°F)		24°C
(75°F)		24°C
(76°F)		25°C
(77°F)		26°C
(79°F)		26°C
(80°F)		26°C
(80°F)		26°C
(80°F)		26°C
(79°F)		25°C
(78°F)		24°C
(76°F)
Average low22°C
(72°F)		22°C
(71°F)		22°C
(71°F)		22°C
(72°F)		23°C
(74°F)		24°C
(76°F)		25°C
(76°F)		25°C
(77°F)		25°C
(77°F)		24°C
(76°F)		23°C
(75°F)		23°C
(73°F)
Mean minimum20°C
(69°F)		21°C
(69°F)		21°C
(69°F)		21°C
(70°F)		22°C
(72°F)		23°C
(74°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)		23°C
(74°F)		22°C
(72°F)		22°C
(71°F)
Minimum18°C
(65°F)		20°C
(68°F)		20°C
(68°F)		20°C
(68°F)		22°C
(71°F)		23°C
(73°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		23°C
(74°F)		22°C
(72°F)		21°C
(70°F)

Compare climate in Coamo with other places

Compare temperature, precipitation, sunshine, UV index in Coamo, Puerto Rico with other places around the world.

Monthly average precipitation in Coamo, Puerto Rico

Coamo usually has the most precipitation in September, October and November, with an average of 23 rainy days and 138 mm (5.5 inches) of precipitation per month. The driest months in Coamo are January, February and December. On average, 41 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Coamo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)37 (1.5)39 (1.5)62 (2.4)60 (2.4)76 (3.0)71 (2.8)106 (4.2)105 (4.1)173 (6.8)136 (5.4)106 (4.2)46 (1.8)
Average precipitation days (≥ 1 mm)121316192019192125242016

Monthly sunshine hours in Coamo, Puerto Rico

The sunniest months in Coamo are May, July and August, when the sun shines an average of 11 hours 28 minutes a day. Least sunny months in Coamo: January, February and November receive an average of 9 hours 37 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Coamo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours260306346349359345355351315313300319
Mean daily daylight hours11h 10m11h 32m12h 2m12h 33m12h 58m13h 10m13h 4m12h 41m12h 12m11h 42m11h 16m11h 3m

Solar UV radiation in Coamo, Puerto Rico

Coamo experiences the highest level of ultraviolet (UV) radiation in April, May and September, when the maximum UV index can reach values of 14 - 14, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 10. For more detailed information, check out our hourly Coamo UV Index data.

Average daily maximum UV levels by month for Coamo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)9111314141313131412109