Best Time to Visit Puerto Rico

The best time to visit Puerto Rico is December to April, when San Juan's average highs are 83.2 to 86.2 F and February and March have the least rain. The Atlantic hurricane season runs from 1 June to 30 November and peaks on 10 September, so September is the riskiest month. We read NOAA's weather normals and the Hurricane Center's climate page on 15 October 2026.

Weather by month in San Juan

Note: Figures are NOAA NCEI 1991 to 2020 monthly normals for station RQW00011641, San Juan L M Marin airport (dataset normals-monthly-1991-2020), read 15 Oct 2026. Rain days are days with 0.10 inch or more. This is one station at sea level near the coast, so the mountains, Culebra, Vieques and the south coast will differ

Adding the monthly figures gives about 59.9 inches of rain a year at this station. The spread in temperature is small. The coolest month averages a high of 83.2 F and the hottest 89.2 F. Rain matters more than heat when you choose the month.

Hurricane season

Note: The Atlantic hurricane season runs from 1 June to 30 November. "The peak of the Atlantic hurricane season is September 10," with most activity between mid-August and mid-October. In 1991 to 2020 there were on average 14 named storms, 7 hurricanes and 3 major hurricanes a year. The first named storm usually forms by 20 June, the third by 3 August and the seventh by 3 September. The page gives no update date (NOAA National Hurricane Center, climatology page, read 15 Oct 2026)

These are Atlantic basin averages, not Puerto Rico counts. The page does not say how many storms reach the island. We did not read NHC's live outlook today, and it changes daily. Look at it before you book and again the week you fly. Our safety guide has the 14 October reading and the state of the island's water and power.

Dengue and mosquitoes

Note: CDC lists Puerto Rico in the "frequent or continuous" dengue risk group, which means more than 10 locally acquired cases in at least 3 of the previous 10 years. Page last reviewed 8 Dec 2025. CDC's Puerto Rico travel page advises repellent with 20% or more DEET and a room with air conditioning or screens (CDC dengue areas page and Puerto Rico travel page, read 15 Oct 2026)

Dengue is not a one season problem on the island. The wet months from July to December give mosquitoes more standing water, but we found no official page that ties the case counts to a month. That link is not confirmed. For the 2024 epidemic and the latest weekly report we found, read our safety guide.

Events with dates

Hours: San Sebastián Street Festival, Old San Juan: Thursday 21 to Sunday 24 January 2027. San Juan's Municipal Ordinance 1, series 2026-2027, approved 1 July 2026, sets the dates. Businesses on the islet close from 1 a.m. to 8 a.m. on the Friday, Saturday and Sunday mornings, and may stay open to 1 a.m. on the last night (ordinance text as posted on LexJuris Puerto Rico, read 15 Oct 2026)

Note: In 2026 the municipality reported 1,083,881 attendees over four days (San Juan figures as reported by Metro Puerto Rico and Noticel, 12 Mar 2026)

Thanksgiving is on 26 November 2026. The start and end dates of the Christmas season are not confirmed from an official page. We do not give other festival dates here, because we did not read an official calendar for them.

Whales and the bioluminescent bays

Note: Mosquito Bay on Vieques: the US Fish and Wildlife Service says Vieques National Wildlife Refuge "also borders with the famous Puerto Mosquito Bioluminescent Bay, managed by the Puerto Rico Department of Natural Resources." Its trails page lists a 2.5 mile loop to an observation platform with a view of the bay. Neither page gives a best month, tour rules or hours (FWS, Vieques refuge activities and trails pages, read 15 Oct 2026)

Note: Humpback whales: NOAA Fisheries says the two North Atlantic humpback populations "migrate south during the winter to calve and mate in the West Indies and Cape Verde." It names no Puerto Rico months (NOAA Fisheries, humpback whale species page, read 15 Oct 2026)

Not confirmed: the whale months around Puerto Rico, the best months or moon phases for the bays, and the tour rules. We searched DRNA's own site on 15 October 2026. Its search for "bioluminiscente" shows only old news items, and nothing on months or tour rules. Ask a DRNA permitted tour operator, or call DRNA at 787-999-2200, a number its home page lists.

When it is busiest

The only crowd figure we have an official date for is the festival: 21 to 24 January 2027, with about a million visitors counted in 2026. We did not find an official monthly visitor or hotel occupancy count for the island, so we cannot rank the other months. Hotel prices are not confirmed. Check rates for your own dates.

The worst time to go, and why

Late August to mid-October is the riskiest stretch. It holds the hurricane peak on 10 September, the hottest highs in the table at 88.6 to 89.2 F, and 10.6 to 11.0 rain days a month. November is the wettest month at 7.37 inches, even though the season ends on 30 November. Travel insurance terms for storms are not confirmed here, so read your own policy before you pay.

Which month for which plan

• Beach and sun with the least rain: February to April.

• Lower prices: not confirmed. We did not check prices.

• Christmas lights and a big party: late November to January 2027, ending with the street festival on 21 to 24 January.

• Lowest storm risk: December to May, before the season begins on 1 June.

• Whales and bioluminescence: dates not confirmed. See the section above.

Entry and ID

Puerto Rico is US territory. A US citizen needs no passport, only an ID that TSA accepts. TSA's list includes the green card and a foreign passport. What CBP or an airline asks of a non-citizen on a flight between the mainland and Puerto Rico is not confirmed. Our passport guide for Puerto Rico lists the CBP, USCIS and TSA sources.

What we checked and what can change

Checked on 15 October 2026: NOAA NCEI 1991 to 2020 monthly normals for station RQW00011641 (San Juan airport), NOAA's National Hurricane Center climatology page, CDC's dengue risk page and Puerto Rico travel page, San Juan's Municipal Ordinance 1, series 2026-2027, the US Fish and Wildlife Service's Vieques refuge pages, NOAA Fisheries' humpback whale page and DRNA's site. Taken from our Christmas guide and not re-read: the 2026 attendance figure, which comes from news reports of the city's count.

Not confirmed: the whale season and bioluminescent bay best months, any official monthly crowd or hotel count, hotel and flight prices, the start and end of the Christmas season, sea temperatures, and the live hurricane outlook. We did not visit the island for this page.

What can change: the festival's line-up and transport timetable are not out yet, hurricane forecasts change by the day, and the normals are averages. Any single year can be much wetter or drier.