Weather in Boa Vista in August

How August compares

August is the 3rd warmest month of the year in Boa Vista and ranks 59th of 134 destinations we compare for August - see where else is hot in August. Within Cape Verde it is 1st of 2 (Cape Verde in August). Against London's average high of 21.4°C in August, Boa Vista is 7.7°C warmer by day and 11.0°C warmer at night.

Daytime and night-time in August

The typical August day in Boa Vista peaks at 29.1°C, but that is an average: the warmest 10% of days reach 30.4°C or more. About 100% of days top 25°C and 1 in 5 pass 30°C. Nights average 24.5°C; one night in ten drops to 23.3°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest August day here reached 32.5°C (2017-08-17) and the coldest night 20.9°C (2019-08-09).

Rain in August

Some rain (4-8 rainy days): about 3 days with 1 mm or more, 22 mm in total. Year to year it varies a lot - the wettest August was 2015 with 85 mm, the driest 1992 with 1 mm. Humidity averages 76%, which makes the heat feel heavier than the thermometer suggests.

Sea temperature in August

The sea averages 26.0°C - warm enough to swim (22°c+). Depending on the year it ranges from 25.2°C to 26.7°C. For the warmest sea here, come in September (26.6°C).

Sunshine and daylight

Around 6.1 hours of sunshine a day (estimated from cloud cover), 12.5 hours of daylight: the sun rises about 06:16 and sets about 18:56 local time in mid-August. Average cloud cover is 52%.

Is August a good time to visit Boa Vista?

Yes - it is one of the better months: hot days, manageable rain. The best months for Boa Vista on our scoring are June, May, March; months averaging 25°C or more: Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Expect heat that lasts into the evening

August sits among Boa Vista's warmer months, and the heat is consistent: every day reaches 25°C in the figures, while 20% reach 30°C. Humidity averages 76%, so the warmth can feel sticky rather than dry, particularly if you are walking around at midday. Plan more active time for the morning and leave room for shade and a slower pace later. Loose, breathable clothes are a better fit than heavy fabrics, and evenings are usually warm enough to stay in lightweight clothing. If warm bedrooms disturb your sleep, air conditioning is worth prioritising when choosing accommodation; average night-time lows offer little cooling relief.

Warm swimming, with room for showers

The sea is a strong reason to choose August: at an average 26°C, it suits travellers who dislike a chilly entry into the water. That warmth makes swimming appealing, though temperature alone does not tell you if conditions are safe. Rain falls on about 3 days during the month, so it need not dominate your plans, but a completely dry stay is not guaranteed. Keep outdoor plans flexible rather than assuming every day will be clear. Sunshine averages about 6.1 hours within 12.5 hours of daylight, so long days do not mean unbroken sunshine. Pack sun protection alongside a light waterproof, and allow for cloud as well as bright spells.