May weather forecast
Costa Rica

As May arrives in Costa Rica, the transition from dry season to the wet season, often called the "Green Season," begins. Average temperatures across the country during May hover between 22°C (71.6°F) and 27°C (80.6°F). The coastal lowlands experience a slight decrease in temperature from the warmer month of April, providing a more comfortable climate for travellers seeking to explore the beautiful coastlines.

In the central highlands, including regions such as San Jose and the Cordillera Central, average temperatures range from 20°C (68°F) to 22°C (71.6°F). While the rainfall increases during this month, periods of sunshine still prevail, making this an excellent time for sightseeing and experiencing Costa Rica's vibrant flora in its freshest and greenest state.

The Caribbean coast, which sees more consistent rainfall throughout the year, continues its trend with rainfall spread throughout May. Despite this, the diversity of wildlife and lush tropical vegetation provide a rich experience for nature enthusiasts.

Although May does not approach the record high temperatures set in February 1964, travellers can still expect warm weather. However, as the month progresses, the frequency and volume of rainfall gradually increase. This precipitation, which usually takes the form of afternoon showers, brings a refreshing relief from the daytime heat and enlivens the tropical landscapes.

Heading into June, the wet season becomes more pronounced, with rainfall becoming more regular and temperatures slightly decreasing. Despite the change in weather, May remains a wonderful time to visit Costa Rica to enjoy the blooming landscapes and witness the beginning of the Green Season.

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• San José - May »
  On the last day of the month, sunrise is at 05:14 and sunset at 17:54 CST. The months with the lowest UV index in San José are January through December, with an average maximum UV index of 5.
• Limon - May »
  Throughout the year, in Limon there are 215.1 rainfall days, and 3567mm (140.43") of precipitation is accumulated. In Limon in May, the average water temperature is 28.8°C (83.8°F).
• Alajuela - May »
  May, in Alajuela stands out with its highest rainfall levels of the year - hefty precipitation totals of 352mm (13.86") spread over nearly an entire month. In May, the average relative humidity in Alajuela is 84%.
• Puntarenas - May »
  On the last day of the month, in Puntarenas, sunrise is at 05:17 and sunset at 17:57 CST. In May, in Puntarenas the rain falls for 19.1 days.
• Liberia - May »
  In Liberia during May, the rain falls for 22.3 days and regularly aggregates up to 149mm (5.87") of precipitation. On the last day of the month, in Liberia, sunrise is at 05:18 and sunset at 18:00 CST.
• Guadalupe - May »
  The months with the highest UV index in Guadalupe are January through December, with an average maximum UV index of 6. In Guadalupe during May, the rain falls for 30 days and regularly aggregates up to 268mm (10.55") of precipitation.
• San Francisco - May »
  On the last day of the month, in San Francisco sunrise is at 05:14 and sunset at 17:54 CST. In San Francisco during May, the rain falls for 27.2 days and regularly aggregates up to 339mm (13.35") of precipitation.
• San Isidro - May »
  The months with the lowest UV index in San Isidro are January through December, with an average maximum UV index of 5. The months with the lowest UV index in San Isidro, Costa Rica, are January through December, with an average maximum UV index of 5.
• Quesada - May »
  May continues Quesada's wet season cycle, registering a substantial increase in rainfall to 369mm (14.53"), making it one of the months with the highest precipitation. In Quesada in May, it is raining for 28.7 days, with typically 369mm (14.53") of accumulated precipitation.
• San Vicente - May »
  On the last day of the month, in San Vicente sunrise is at 05:13 and sunset at 17:54 CST. In San Vicente in May, it is raining for 27.2 days, with typically 339mm (13.35") of accumulated precipitation.
• San Rafael - May »
  In San Rafael in May, it is raining for 29.1 days, with typically 367mm (14.45") of accumulated precipitation. On the last day of May, in San Rafael, Costa Rica, sunrise is at 05:14 and sunset at 17:54 CST.
• San Diego - May »
  On the last day of the month, in San Diego, Costa Rica, sunrise is at 05:13 and sunset at 17:53 CST. January through December, with an average maximum UV index of 5, are months with the highest UV index in San Diego, Costa Rica.