Santo Domingo month by month
The figures correspond to the 1991-2020 series: around 1,482 mm a year, highs from 30.0 to 32.4 °C and lows from 21.2 to 24.3 °C. Temperature barely tells you anything; rainfall does all the work.
01 A useless thermometer
Santo Domingo’s highs run from 30.0 °C in January and February to 32.4 °C in September. Lows go from 21.2 to 24.3 °C. In other words: the coolest and hottest months are barely two degrees apart, and no night of the year drops below twenty.
What does change a lot is how it feels, because humidity travels with the rain. In March a 30 °C day is comfortable in the shade; in August a 32 °C day with heavy air forces you to organise the day differently.
02 Two peaks, not one
The detail people miss is that the rainfall curve has two humps. It rises sharply in May (about 151 mm), eases in June (119 mm) and climbs again to the August maximum (195 mm) and September (192 mm).
That June pause is deceptive. It is real in millimetres, but it coincides with the start of hurricane season, so it does not pay off as a travel window: it rains less, but the risk is already on the table.
At the other end, the dry season is short and clear: December to March, with March as the driest month of the year (about 54 mm) and February right behind (59 mm). Four months of reliable calendar.
03 Cyclone season
The Atlantic season runs from 1 June to 30 November, and the most active stretch falls between August and October. The island lies on the usual corridor of systems crossing the Atlantic, and the city remembers it.
The San Zenón cyclone, in September 1930, destroyed much of Santo Domingo, and Hurricane Georges struck the country again in September 1998. It is not a daily risk, but it is a reason to take out insurance and leave slack if you travel in those months.
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04 How the city changes
In the dry season the Colonial City can be walked end to end at any hour and the street terraces work all afternoon. The coral limestone reflects the light and the whole ensemble looks pale, almost white at midday.
In the wet season the pattern flips: clear mornings, heavy afternoon downpours and streets that empty while they last. It does not usually rain all day, but enough that outdoor plans are best scheduled before lunch.
Key moments at a glance
Between 54 and 77 mm a month and manageable humidity.
Rain climbs to 151 mm in May and 1 June opens the season.
Around 720 mm in four months and peak cyclone risk.
Still 148 mm, but the season closes on the 30th.
05 Verdict
Go between December and March. It is the only stretch where three things line up: little rain, bearable humidity and cyclone season closed. March and February are the year’s best months, in that order.
If you can only go in summer, do not rule it out: the city works the same and the downpours are short. But organise mornings for the street, leave afternoons for interiors and book a ticket with flexible changes.
