Roseau weather in August

August in Roseau: sweltering, rainy, with clean air — fine if you can take 19 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Roseau🇩🇲 Dominica · Lesser Antilles · Island82
  1. 89Jan
  2. 89Feb
  3. 90Mar
  4. 89Apr
  5. 88May
  6. 86Jun
  7. 83Jul
  8. 82Aug
  9. 80Sep
  10. 81Oct
  11. 83Nov
  12. 87Dec

#10 of 12 months in Roseau · #609 of 1413 destinations to visit in August · comfort 82/100 (tier A)

Days
33°C
Nights
24°C
Wet days
19
Sun
11.3 h
Humidity
83%
Daylight
13 h
Roseau, Dominica
Photo: Zeamays at English Wikipedia · CC BY 3.0

Traveller notes on Roseau in August

Other months in Roseau

Dominica's forum is upfront that October sits in peak hurricane season, so the odds of a tropical wave or storm affecting a trip are real, though a direct hit remains the exception rather than the rule. As a lush rainforest island, it's genuinely going to rain somewhere on Dominica most days, but posters describe showers as typically brief and scattered, heavier up in the mountains than down in Roseau itself, with a lot of the rain falling overnight. October through December is actually recommended by some specifically for the World Creole Festival, drawing visitors despite the storm risk.
DominicaNatureIslandRegular · October · 1 month ago · Read more on Tripadvisor ↗
Forum posters consistently describe Dominica, 'the nature island,' as the most rainforested of the Eastern Caribbean islands - genuinely rainy somewhere on the island most days, which posters point to as exactly why it stays so lush and green with so many rivers. Posters are equally consistent that showers here tend to be brief, usually followed quickly by sunshine again, and one visitor's multi-week April-May stay in Roseau itself saw no rain at all, even as areas just a few miles inland got frequent heavy downpours. Posters generally name the December-through-April stretch as the main dry season with the calmest seas, and specifically recommend April for hiking, noting that conditions only get hotter and wetter as hurricane season approaches in the summer months.
Tripadvisor community · April · 1 month ago · Read more on Tripadvisor ↗

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Roseau climate normals — August

Daytime high33°C / 91°F🔥 sweltering
Nighttime low24°C / 76°F
Feels like (high)37°C / 99°F
Sea temperature30°C / 85°F♨️ bath-warm
Rainfall98 mm / 3.9 in🌧 rainy
Rainy days19 days
Humidity83%💦 very humid
Dew point25°C / 76°F
Sunshine11.3 h/day
Daylight12.6 h
Wind31 km/h / 19 mph
Air quality (US AQI)45🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Roseau in August

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

Quietschool holidays in 3 of the markets that fill it, one of its worst months for weather(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Roseau's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherRoseau's weather doesn't swing hard through the year — comfort stays fairly steady in every month.

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What's on in Roseau in August

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Hazard

    Hurricane season

    1 Jun – 30 Nov

    Maria crossed the island as a category five in September 2017 and stripped the forest bare; the recovery shaped everything built since. Roseau sits at the mouth of a river valley and floods before the wind does anything. Source ↗

What's on around the world in August →

Nearby, and something's on

Within 300 km of Roseau — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Roseau?

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Roseau in August — FAQ

Is August a good time to visit Roseau?
August in Roseau: sweltering, rainy, with clean air — fine if you can take 19 rainy days. It ranks #10 of 12 months for Roseau on SeasonMap's comfort score (82/100).
What is the weather like in Roseau in August?
In August, Roseau averages a daily high of 32.5°C and a low of 24.4°C, with about 97.9 mm of rain over roughly 18.7 rainy days.
What is the air quality in Roseau in August?
Roseau has a mean US Air Quality Index of about 45 in August.

Within 300 km: Fort-de-France's Tour des Yoles Rondes on 26 Jul – 2 Aug, and Pointe-à-Pitre's Tour cycliste de la Guadeloupe on 31 Jul – 9 Aug.