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Solar and backup power in Puerto Rico
Sunshine across Puerto Rico ranges from 5.22 peak sun hours a day on average in Arecibo to 5.76 in Guayama. The same home needs noticeably more panels in the cloudiest cities, especially in their dullest month.
Household supply: 120/240 V split-phase.
| City | Municipality | Average sun hours | Least sunny month |
|---|---|---|---|
| Guayama | Guayama | 5.76 | December: 4.58 |
| Mayagüez | Mayagüez | 5.58 | December: 4.41 |
| Fajardo | Fajardo | 5.53 | December: 4.23 |
| San Juan | San Juan | 5.22 | December: 4.08 |
| Ponce | Ponce | 5.22 | December: 4.08 |
| Arecibo | Arecibo | 5.22 | December: 4.08 |
Source: NASA POWER climatology, ALLSKY_SFC_SW_DWN (25-year Meteorological and Solar Monthly & Annual Climatologies (January 2001 - December 2025)), retrieved 2026-11-09.