Roseau weather in August

In August, Roseau sees average daytime highs of 28°C and overnight lows near 26°C, with 99 mm of rain across 18.4 wet days and about 12.5 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 49% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of August to 12 h 18 min by month's end. Set against the rest of the year, August is Roseau's 8th-clearest and 9th-windiest month. For the whole year in context, see Roseau's year-round climate.

Daytime high
28°
2nd warmest
Overnight low
26°
11th coldest
Rainfall
99 mm
18.4 wet days
Daylight
12 h 30 min
5:54 AM – 6:25 PM
Cloud cover
48%
8th clearest
Wind
26 km/h
9th windiest
Solar energy
6.31 kWh/m²
Travel score
5.4
out of 10

Roseau is capital of Dominica.

Density
3,069/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical August day in Roseau reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 28°C. Set against its neighbours, August runs on par with July and on par with September.

24°26°28°30°32°151015202531
Avg high (°C)Avg low (°C)
12726
22726
32726
42726
52726
62726
72826
82826
92826
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826
312826

Roseau weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 24°321211.27.1
Feb25° / 24°19711.57.8
Mar25° / 24°196.911.97.8
Apr26° / 25°298.312.37.2
May27° / 25°4410.212.76.7
Jun27° / 26°4710.512.96.4
Jul27° / 26°7616.412.85.8
Aug28° / 26°9918.412.55.4
Sep28° / 26°11317.112.15.3
Oct28° / 26°11819.111.75.2
Nov27° / 26°10117.111.35.7
Dec26° / 25°4814.211.16.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16931
26931
36832
46832
56733
66733
76733
86634
96634
106634
116733
126733
136733
146733
156733
166733
176733
186634
196634
206634
216634
226535
236535
246436
256337
266238
276238
286139
295941
305941
315941

Chance of precipitation in August

Any precipitation

Roseau gets around 99 mm of rain over 18.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 59% and peaks near 62% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
161
261
362
462
562
662
762
862
962
1062
1162
1262
1362
1462
1561
1661
1761
1860
1960
2059
2159
2258
2358
2457
2556
2656
2755
2855
2954
3054
3153

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the oppressive band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
18020
27921
37921
47822
57822
67822
77723
87723
97723
107624
117624
127525
137525
147426
157426
167327
177327
187228
197228
207129
217129
227129
237030
247030
257030
267030
277030
287030
297030
307030
317030

Wind in August

Winds average 26 km/h in August.

Across August, daily wind ranges from about 23 km/h on the calmest days to 28 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
128breezy
227breezy
327breezy
427breezy
527breezy
627breezy
727breezy
827breezy
927breezy
1027breezy
1126breezy
1226breezy
1326breezy
1426breezy
1526breezy
1626breezy
1726breezy
1826breezy
1925breezy
2025breezy
2125breezy
2225breezy
2325breezy
2425breezy
2524breezy
2624breezy
2724breezy
2824breezy
2924breezy
3024breezy
3123breezy

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 42 min at the start of August to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over August. Sunrise moves from 5:51 AM to 5:56 AM, and sunset from 6:32 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:516:32
212.75:516:32
312.75:516:32
412.75:526:31
512.65:526:31
612.65:526:30
712.65:526:30
812.65:536:29
912.65:536:29
1012.65:536:28
1112.65:536:28
1212.65:536:27
1312.65:546:27
1412.55:546:26
1512.55:546:26
1612.55:546:25
1712.55:546:25
1812.55:546:24
1912.55:556:23
2012.55:556:23
2112.55:556:22
2212.45:556:21
2312.45:556:21
2412.45:556:20
2512.45:556:19
2612.45:566:19
2712.45:566:18
2812.45:566:17
2912.35:566:17
3012.35:566:16
3112.35:566:15

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.31 kWh/m².

For context, solar energy here swings from a low near 4.81 kWh/m² to a high of 6.7 kWh/m² in April across the year — August's 6.31 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.4Intense
56.4Intense
66.4Intense
76.4Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.2Intense
266.2Intense
276.2Intense
286.2Intense
296.2Intense
306.2Intense
316.2Intense
Planning a trip in August

Hazard calendar for Roseau

In seasonPeak

In August, Roseau sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

Roseau sits in the Atlantic hurricane belt; the season peaks August–October.

Roseau's rainy season runs July–November, when most of the year's rain falls.

Roseau sees seasonal dust haze (June–July), heaviest in June.

Atlantic hurricane
Rainy season
Dust
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Roseau?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.4
Sightseeing
10th-best month of the year
5.7
Beach & pool
10th-best month of the year

August is a reasonable time to visit Roseau for sightseeing.

What to pack for Roseau in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Roseau sees daytime highs around 28°C and nights near 26°C. Pack light clothes, rain gear and sun protection. Worth having: a windbreaker. About 18 days see rain.

light clothesrain gearsun protectiona windbreaker

Sea temperature near Roseau in August

The nearest coast averages about 29°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in September at about 29°C and coldest in February near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr27Warm
May28Warm
Jun28Warm
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Roseau in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Roseau peaks around March 21 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highMar 21UV 13Dec 13UV 8
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun11Extreme
Jul12Extreme
Aug11Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Roseau in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Roseau is worst in June — around 28 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (December, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodJun 2028 µg/m³Dec 239 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar11Good
Apr15Moderate
May18Moderate
Jun28Moderate
Jul26Moderate
Aug21Moderate
Sep16Moderate
Oct18Moderate
Nov12Moderate
Dec9Good
Location & terrain

Where is Roseau?

Roseau sits at 15.3°N, 61.4°W, 11 m above sea level, in Dominica. The nearest listed city is Sainte-Marie, 72 km away.

Topography around Roseau

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Roseau.

Within 3 km, the terrain around Roseau has significant variations in elevation — a maximum elevation change of 417 m around an average of 66 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,383 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,389 m.

The land around Roseau is covered by water (55%) and trees (38%) within 3 km, water (58%) and trees (41%) within 16 km, and water (89%) within 80 km.

3 km
417 m
16 km
1,383 m
80 km
1,389 m
treesartificial surfaceswater
August weather nearby: Sainte-Marie 72 km · La Trinité 78 km · Saint-Joseph 80 km · Le Robert 84 km · Fort-de-France 85 km · Capesterre-Belle-Eau 85 km · Basse-Terre 86 km · Le Lamentin 87 km

Dominica travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 48% of US
price level, 2025
GDP per capita
$10,989
2025
Homicide rate
27.1
per 100k, 2023
Road deaths
10.9
per 100k/yr, 2016
Income group
Upper middle
World Bank
Religion
Roman Catholic 53%Protestant 30%none 9%other 4%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Roseau (15.3017°, -61.3881°, elevation 11 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).