May Weather in Puerto Rico
The tables below give the normal May temperatures and rainfall for cities and popular vacation spots in Puerto Rico. There's also information here on this month's average humidity and ocean temperature at San Juan.
The measures of climate are averages of historical data collected at weather stations over several decades.
One site, Pico Del Este, is much cooler and rainier than others on the list. That's because it's a high mountain peak, at 3448 feet (1050 metres) elevation, in the El Yunque Caribbean National Forest.
Temperature
| High °F | Low °F | Place | High °C | Low °C |
|---|---|---|---|---|
| 89 | 69 | Arecibo | 32 | 21 |
| 82 | 67 | Cayey | 28 | 19 |
| 86 | 72 | Dorado | 30 | 22 |
| 88 | 73 | Fajardo | 31 | 23 |
| 88 | 75 | Guayama | 31 | 24 |
| 86 | 70 | Isabela | 30 | 21 |
| 86 | 71 | Manati | 30 | 22 |
| 79 | 65 | Maricao | 26 | 18 |
| 89 | 70 | Mayagüez | 32 | 21 |
| 90 | 72 | Mona Island | 32 | 22 |
| 69 | 62 | Pico Del Este | 21 | 17 |
| 89 | 72 | Ponce | 32 | 22 |
| 88 | 72 | Rincón | 31 | 22 |
| 88 | 76 | San Juan | 31 | 25 |
| 92 | 68 | San Sebastián | 33 | 20 |
| 88 | 65 | Utuado | 31 | 19 |
Ocean Temperature at San Juan, Puerto Rico averages 81 degrees Fahrenheit (27 degrees Celsius) in May.
Rainfall
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 12 | Arecibo | 6.8 | 173 |
| 16 | Cayey | 5.5 | 140 |
| 14 | Dorado | 6.5 | 166 |
| 17 | Fajardo | 8.4 | 212 |
| 15 | Guayama | 5.8 | 146 |
| 15 | Isabela | 7.9 | 200 |
| 14 | Manati | 7.6 | 192 |
| – | Maricao | 12.0 | 306 |
| 13 | Mayagüez | 6.8 | 172 |
| 12 | Mona Island | 4.4 | 111 |
| 28 | Pico Del Este | 18.1 | 461 |
| 11 | Ponce | 4.6 | 118 |
| – | Rincón | 6.8 | 172 |
| 16 | San Juan | 5.9 | 150 |
| 16 | Utuado | 9.3 | 237 |
Relative Humidity at San Juan, Puerto Rico in May averages 78 percent in the morning and 66 percent in the afternoon.
References
National Climatic Data Center. NOAA's 1981-2010 Climate Normals.
National Oceanographic Data Center. NODC Coastal Water Temperature Guide (CWTG).