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Monthly climate in Arroyo, Puerto Rico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Arroyo features a tropical savanna climate (Aw). Temperatures typically range between 24 °C (76 °F) and 27 °C (81 °F) through the year, but rarely can drop to 21 °C (70 °F) or can rise to as high as 30 °C (86 °F). The average annual precipitation amounts to about 1233 mm (48.5 inches) and receives 275 rainy days on the 1 mm (0.04 inches) threshold annually. Arroyo enjoys an average of 3924 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 Arroyo, Puerto Rico

The warmest months in Arroyo are July, August and September, with daily mean temperatures ranging from 27 to 27 °C (80 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 24 to 24 °C (76 - 76 °F) throughout the day. On average each year, Arroyo experiences 312 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 Arroyo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum27°C
(81°F)		27°C
(80°F)		27°C
(81°F)		28°C
(82°F)		29°C
(84°F)		29°C
(85°F)		29°C
(85°F)		30°C
(85°F)		30°C
(86°F)		29°C
(85°F)		28°C
(83°F)		28°C
(82°F)
Mean maximum26°C
(80°F)		26°C
(80°F)		26°C
(80°F)		27°C
(81°F)		28°C
(82°F)		28°C
(83°F)		29°C
(84°F)		29°C
(85°F)		30°C
(86°F)		29°C
(84°F)		28°C
(83°F)		27°C
(82°F)
Average high26°C
(78°F)		25°C
(78°F)		25°C
(78°F)		26°C
(79°F)		27°C
(80°F)		27°C
(82°F)		28°C
(82°F)		28°C
(83°F)		28°C
(83°F)		28°C
(83°F)		27°C
(81°F)		26°C
(80°F)
Daily mean24°C
(76°F)		24°C
(76°F)		24°C
(76°F)		25°C
(77°F)		25°C
(78°F)		26°C
(79°F)		27°C
(80°F)		27°C
(81°F)		27°C
(81°F)		27°C
(80°F)		26°C
(79°F)		25°C
(77°F)
Average low23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		23°C
(74°F)		24°C
(76°F)		25°C
(77°F)		25°C
(78°F)		26°C
(78°F)		26°C
(78°F)		25°C
(78°F)		25°C
(76°F)		24°C
(75°F)
Mean minimum22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		22°C
(72°F)		23°C
(74°F)		24°C
(76°F)		24°C
(76°F)		24°C
(76°F)		25°C
(77°F)		24°C
(76°F)		24°C
(75°F)		23°C
(73°F)
Minimum21°C
(70°F)		21°C
(70°F)		22°C
(71°F)		22°C
(71°F)		22°C
(73°F)		24°C
(75°F)		24°C
(75°F)		24°C
(75°F)		24°C
(76°F)		24°C
(75°F)		23°C
(74°F)		23°C
(73°F)

Compare climate in Arroyo with other places

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

Monthly average precipitation in Arroyo, Puerto Rico

Arroyo usually has the most precipitation in July, September and October, with an average of 26 rainy days and 165 mm (6.5 inches) of precipitation per month. The driest months in Arroyo are January, February and March. On average, 55 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Arroyo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)48 (1.9)51 (2.0)64 (2.5)67 (2.7)97 (3.8)92 (3.6)139 (5.5)134 (5.3)190 (7.5)165 (6.5)119 (4.7)67 (2.6)
Average precipitation days (≥ 1 mm)171920212424262527262323

Monthly sunshine hours in Arroyo, Puerto Rico

The sunniest months in Arroyo are May, July and August, when the sun shines an average of 11 hours 26 minutes a day. Least sunny months in Arroyo: January, February and November receive an average of 9 hours 38 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Arroyo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours259305346348359344354350317314303319
Mean daily daylight hours11h 10m11h 32m12h 2m12h 33m12h 58m13h 10m13h 3m12h 41m12h 12m11h 42m11h 16m11h 3m

Solar UV radiation in Arroyo, Puerto Rico

Arroyo experiences the highest level of ultraviolet (UV) radiation in April, August and September, when the maximum UV index can reach values of 13 - 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 9. For more detailed information, check out our hourly Arroyo UV Index data.

Average daily maximum UV levels by month for Arroyo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)911131313131313141299