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, Puerto Rico, in May, during 14.8 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. The months with the highest humidity in San Juan are May through July, with an average relative humidity of 79%.
• Fajardo - May »
  The months with the highest UV index in Fajardo are January, March through December, with an average maximum UV index of 7. January, March through December, with an average maximum UV index of 7, are months with the highest UV index in Fajardo, Puerto Rico.
• 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 November, with an average maximum UV index of 7, are months with the highest UV index in Toa Baja, Puerto Rico.
• Aguadilla - May »
  The months with the lowest UV index in Aguadilla, Puerto Rico, are January through December, with an average maximum UV index of 7. In Aguadilla during the entire year, the rain falls for 235.5 days and collects up to 31.97" (812mm) of precipitation.
• Vega Baja - May »
  The month with the most rainfall in Vega Baja is May, when the rain falls for 22.9 days and typically aggregates up to 4.02" (102mm) of precipitation. On the first day of May in Vega Baja sunrise is at 5:57 am and sunset at 6:47 pm.
• Juana Díaz - May »
  In Juana Díaz in May, during 24.6 rainfall days, 2.95" (75mm) of precipitation is typically accumulated. In May, the average ocean temperature in Juana Díaz is 82°F (27.8°C).
• Adjuntas - May »
  April through October, with an average maximum UV index of 7, are months with the highest UV index in Adjuntas, Puerto Rico. January through August, October through December are months without snowfall in Adjuntas, Puerto Rico.
• Cabo Rojo - May »
  On the last day of the month, in Cabo Rojo sunrise is at 5:52 am and sunset at 7:00 pm AST. In Cabo Rojo, during May, the rain falls for 24.3 days and regularly aggregates up to 2.56" (65mm) of precipitation.
• Guánica - May »
  In Guánica in May, during 21.6 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Guánica, Puerto Rico, snow does not fall in January through August, October through December.
• Vega Alta - May »
  The months with the highest humidity in Vega Alta, Puerto Rico, are May through July and November, with an average relative humidity of 79%. May and June, with an average of 10.8h of sunshine, are months with the most sunshine in Vega Alta, Puerto Rico.
• Luquillo - May »
  May through August, with an average relative humidity of 79%, are the most humid months in Luquillo, Puerto Rico. January, March through December, with an average maximum UV index of 7, are months with the highest UV index in Luquillo, Puerto Rico.
• Rincon - May »
  January through December, with an average maximum UV index of 7, are months with the lowest UV index in Rincon, Puerto Rico. In Rincon, Puerto Rico, in May, during 24.5 rainfall days, 3.86" (98mm) of precipitation is typically accumulated.