Weather in Grenada in August

How August compares

August is the 4th warmest month of the year in Grenada and ranks 84th of 134 destinations we compare for August - see where else is hot in August. Against London's average high of 21.4°C in August, Grenada is 6.6°C warmer by day and 12.4°C warmer at night.

Daytime and night-time in August

The typical August day in Grenada peaks at 28.0°C, but that is an average: the warmest 10% of days reach 28.9°C or more. About 100% of days top 25°C and 1 in 1000 pass 30°C. Nights average 25.9°C; one night in ten drops to 25.1°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest August day here reached 30.2°C (2020-08-28) and the coldest night 24.2°C (2018-08-04).

Rain in August

Wet (more than 8 rainy days): about 24 days with 1 mm or more, 150 mm in total. Year to year it varies a lot - the wettest August was 2007 with 297 mm, the driest 2019 with 78 mm. Humidity averages 82%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in August

The sea averages 28.7°C - warm enough to swim (22°c+). Depending on the year it ranges from 28.2°C to 29.3°C. For the warmest sea here, come in September (29.2°C).

Sunshine and daylight

Around 5.5 hours of sunshine a day (estimated from cloud cover), 12.4 hours of daylight: the sun rises about 05:56 and sets about 18:27 local time in mid-August. Average cloud cover is 55%.

Is August a good time to visit Grenada?

It is a reasonable choice: hot days but expect showers. The best months for Grenada on our scoring are March, February, April; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Warm enough for swimming, with little relief at night

The heat is consistent rather than extreme, but humidity of 82% can make it feel close, especially when you are walking around. Loose, breathable clothing makes more sense than heavy fabrics, and accommodation with effective cooling is a sensible priority: evenings offer little temperature relief. Compared with London's August daytime average of 21.4°C, Grenada is 6.6°C warmer, so expect a noticeable change from home. Keep strenuous outdoor plans flexible and take breaks when the heat feels tiring. The sea averages 28.7°C, making it comfortably warm for swimming, though warm water alone is not a reason to ignore changing weather or local safety advice.

Expect frequent rain, not a reliably dry holiday

With about 24 rainy days, August is a poor fit if your holiday depends on staying outdoors in dry weather throughout. Rain need not rule out a trip, but it should shape your plans: carry a light waterproof, protect anything that needs to stay dry and leave room to rearrange outdoor time. There are about 5.5 hours of sunshine within 12.4 hours of daylight, so sunshine is still part of the picture, just not something to count on continuously. Avoid assuming the rain will arrive only when it suits you. This month works better for travellers who can change plans than for those hoping to spend every daylight hour beside the sea.