SAN JUAN, Puerto Rico – The worst drought in five years is creeping across the Caribbean, prompting officials around the region to brace for a bone dry summer.

From Puerto Rico to Cuba to the eastern Caribbean island of St. Lucia, crops are withering, reservoirs are drying up and cattle are dying while forecasters worry that the situation could only grow worse in the coming months.

Thanks to El Nino, a warming of the tropical Pacific that affects global weather, forecasters expect the hurricane season that began in June to be quieter than normal, with a shorter period of rains. That means less water to help refill Puerto Rico’s thirsty Carraizo and La Plata reservoirs as well as the La Plata river in the central island community of Naranjito. A tropical disturbance that hit the U.S. territory on Monday did not fill up those reservoirs as officials had anticipated.

Puerto Rico is among the Caribbean islands worst hit by the water shortage, with more than 1.5 million people affected by the drought so far, according to the U.S. National Drought Mitigation Center.

Tens of thousands of people receive water only every third day under strict rationing recently imposed by the island government. Puerto Rico last week also activated National Guard troops to help distribute water and approved a resolution to impose fines on people and businesses for improper water use.

The Caribbean’s last severe drought was in 2010. The current one could grow worse if the hurricane season ending in November produces scant rainfall and the region enters the dry season with parched reservoirs, said Cedric Van Meerbeeck, a climatologist with the Caribbean Institute for Meteorology and Hydrology.

“We might have serious water shortages …for irrigation of crops, firefighting, domestic consumption or consumption by the hotel sector,” he said.

The tourism sector has also been affected.

Most large hotels in Puerto Rico have big water tanks and some recycle wastewater to irrigate green areas, but many have curtailed water use, said Frank Comito, CEO of the Florida-based Caribbean Hotel & Tourism Association.

Other hotels have cut back on sprinkler time by up to 50 per cent, said Carlos Martinez of Puerto Rico’s Association of Hotels. “Everybody here is worried,” he said. “They are selling water tanks like hot cakes … and begging God for rain.”

Guests at Puerto Rico’s El Canario by the Lagoon hotel get a note with their room keys asking them to keep their showers short amid the water shortage. “We need your co-operation to avoid waste,” says the message distributed at the front desk of the hotel in the popular Condado district.

At the Casa del Vega guesthouse in St. Lucia, tourists sometimes find the water in their rooms turned off for the day, preventing them from taking a shower. “Even though we have a drought guests are not sympathetic to that,” hotel manager Merlyn Compton said.