Roseau, Dominica Climate & Monthly Averages

The climate of Roseau

Roseau has one of the steadier climates in our dataset. Average highs move only 3°C across the whole year - from 80°F (26°C) in February to 85°F (29°C) in September - so the practical difference between seasons here is rainfall and daylight, not warmth.

Climate quick facts

• Hottest month: September - highs near 85°F (29°C)
• Coldest month: February - highs near 80°F (26°C)
• Decade extremes (2015-2024): 90°F (32°C) high · 69°F (20°C) low
• Wettest month: September (19 rainy days) · Sunniest: April (11.8 h sun/day)
• Climate type: tropical wet-and-dry
• Annual swing: 3°C between the average warmest and coolest month · day to night: 3°C
• Average humidity: 80%

Temperatures through the year

Relative humidity averages 80% across the year, more humid than roughly 84% of the cities we track - enough that summer afternoons feel hotter than the thermometer says, which is what the dew point converter is for. February sits at the other end of the year: 80°F (26°C) by day, 74°F (23°C) at night. September is the warm end of the year, averaging 85°F (29°C) by day and 78°F (26°C) overnight. Between the average September and the average February lie 3°C, a narrower spread than all but 7% of the 3496 cities in our dataset.

Rain, sun and snow

April is the brightest month at 11.8 hours of sun a day, against an annual average of 11.1 - sunnier than 97% of the 3496 cities in our dataset. Days and nights are about 3°C apart on average - narrower than almost anywhere else we cover. September is the wettest month at 5.5 inches (139 mm) over 19 days; April is the driest. The gridded 2015-2024 daily record for this location tops out at 90°F (32°C) and bottoms at 69°F (20°C) - decade extremes, not all-time station records.

How Roseau compares

• Rain or snow reaches the ground on 222 days a year - more wet days than 94% of the 3496 cities we track.
• Roseau averages 79°F (26°C) across the year - warmer than 89% of the 3496 cities we track.

Ranked against every city in our dataset, each measured on the same ten-year window.

Best time to visit Roseau

The best time to visit Roseau is generally December to May, when humidity and rainfall are at their lowest, which is what actually varies here. Daytime temperatures in that window sit near 81°F (27°C), with rain on about 16 days a month. For the same question asked the other way round, see where else is warm in December.

Pack for Roseau with light clothing for the warm months, proper waterproofs rather than an umbrella - wet days are the norm here and moisture-wicking fabrics for the humidity. September nights average 78°F (26°C), so evenings rarely match the afternoons.