May weather forecast
Puerto Rico, USA

May signifies a pivotal point in Puerto Rico's climatic timeline, as the island moves decisively into its wet season. Temperatures this month continue to climb, with lows hovering around 75°F (23.9°C) and highs reaching 88°F (31.1°C). This gradual increase from April's figures cements the progression towards the more tropical months ahead.

In keeping with the established trend, areas like San Juan in the northern part have milder temperatures compared to the southern regions. Yet, the distinct cooling effect of higher altitudes is evident in towns located within the Cordillera Central Mountain Range, such as Aibonito and Utuado. These areas serve as cooler sanctuaries, especially when contrasted with the rising temperatures in the rest of the territory.

In terms of precipitation, May stands out. The frequency and intensity of rainfall heighten considerably compared to April. Showers, often heavy, become a regular feature, with the island experiencing a marked increase in wet days. Coastal areas like Guayama and Humacao, though warm, aren't exempt from these rain events. As the month progresses, the amalgamation of warmth and moisture embodies Puerto Rico's tropical rainforest climate in full swing.

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• San Juan - May »
  In San Juan in May, the average water temperature is 81.5°F (27.5°C). Nighttime temperature in San Juan sees a small decrement from daytime highs, dipping to an average of 76.6°F (24.8°C) during May.
• Fajardo - May »
  The months with the highest humidity in Fajardo are May through August, with an average relative humidity of 79%. In Fajardo, Puerto Rico, in May, the average water temperature is 81.5°F (27.5°C).
• Toa Baja - May »
  May and June, with an average of 10.8h of sunshine, are months with the most sunshine in Toa Baja, Puerto Rico. May through July and November, with an average relative humidity of 79%, are most humid months in Toa Baja.
• Aguadilla - May »
  The months with the highest UV index in Aguadilla are January through December, with an average maximum UV index of 7. The months with the highest UV index in Aguadilla, Puerto Rico, are January through December, with an average maximum UV index of 7.
• Vega Baja - May »
  The months with the highest humidity in Vega Baja, Puerto Rico, are May through July, October and November, with an average relative humidity of 79%. In Vega Baja in May, it is raining for 22.9 days, with typically 4.02" (102mm) of accumulated precipitation.
• Juana Díaz - May »
  Throughout the year, in Juana Díaz, there are 249.1 rainfall days, and 28.82" (732mm) of precipitation is accumulated. On the first day of May in Juana Díaz, sunrise is at 5:59 am and sunset at 6:47 pm.
• Adjuntas - May »
  In Adjuntas, during the entire year, the rain falls for 224.9 days and collects up to 23.58" (599mm) of precipitation. In Adjuntas, during May, the rain falls for 21.6 days and regularly aggregates up to 2.05" (52mm) of precipitation.
• Cabo Rojo - May »
  In Cabo Rojo, Puerto Rico, during the entire year, the rain falls for 235 days and collects up to 25.55" (649mm) of precipitation. On the last day of the month, in Cabo Rojo sunrise is at 5:52 am and sunset at 7:00 pm AST.
• Guánica - May »
  In Guánica snow does not fall in January through August, October through December. On the last day of May, in Guánica sunrise is at 5:51 am and sunset at 6:59 pm AST.
• Vega Alta - May »
  The months with the highest UV index in Vega Alta are May through November, with an average maximum UV index of 7. The months with the most sunshine in Vega Alta are May and June, with an average of 10.8h of sunshine.
• Luquillo - May »
  The months with the highest humidity in Luquillo are May through August, with an average relative humidity of 79%. The months with the highest UV index in Luquillo are January, March through December, with an average maximum UV index of 7.
• Rincon - May »
  In Rincon in May, the average water temperature is 81.5°F (27.5°C). In Rincon, Puerto Rico, in May, it is raining for 24.5 days, with typically 3.86" (98mm) of accumulated precipitation.