#1Hot
Boa Vista
- Day
- 29.4°C
- Sea
- 26.6°C
- Sun
- 6.3h
- Rain days
- 6
Your September weather guide
Weather in Cape Verde in September
September is a good month for Cape Verde if you want hot days and warm seas, and can accept some rain. Country averages of 28°C by day and 27°C in the sea favour swimming and relaxed time outdoors, while 5 rainy days mean you should keep plans flexible. The catch is that evenings stay warm too. Choose Boa Vista for higher daytime temperatures, or Sal if you prefer slightly less heat during the day.
Long-term climate averages, not a forecast · 1991-2020
- Average daytime high
- 28.1°Cacross 2 destinations
- Average night-time low
- 25.3°Cafter dark
- Sea temperature
- 26.6°Cwarm enough to swim
- Rainy days
- 5days1 mm or more
Cape Verde, month by month
Turn up the warmth
Warmest places in Cape Verde in September
Ranked by average daytime high. The full comparison is in the table below.
#2Hot
Sal
- Day
- 26.9°C
- Sea
- 26.6°C
- Sun
- 6.5h
- Rain days
- 5
Cape Verde destinations ranked for September
All 2 places we track in Cape Verde, ordered by daytime high.
September climate overview
Daytime highs across Cape Verde in September run from 26.9°C (Sal) to 29.4°C (Boa Vista). In Boa Vista about 100% of September days reach 25°C. Nights average 25.3°C; the coldest 10% of nights in Sal fall to 25°C or below.
Rainfall in September
Expect around 5 rainy days (1 mm or more) in September, with Sal the driest (5 days) and Boa Vista the wettest (6 days). The wettest September at Boa Vista between 1991 and 2020 was 2010 with 110 mm; the driest was 2017 with 2 mm.
Sea temperature
The sea averages 26.6°C around Cape Verde in September - warmest at Boa Vista (26.6°C). That is comfortable for swimming.
Sunshine and daylight
Around 6.4 hours of sunshine a day on average, out of 12.1 hours of daylight (sunshine estimated from cloud cover).
September against the rest of the year in Cape Verde
September is the 1st warmest month of the twelve in Cape Verde. It is 0.4°C warmer than August and 0.3°C cooler in October. The hottest month here is September (28°C) and the coolest February (23°C).
Which part of Cape Verde in September?
- Most sunshine: Sal, 6.5 h a day.
- Driest: Sal, about 5 rainy days.
- Warmest sea: Boa Vista, 27°C.
- Hottest: Boa Vista, 29°C by day.
- Coolest (better for walking and cities): Sal, 27°C.
What to pack for Cape Verde in September
Based on the averages: summer clothes for the day; a light waterproof for the odd shower; swimwear - the sea is 27°C.
Similar weather elsewhere in September
Within 1.5°C of Cape Verde's September daytime average: Tulum (30°C, sea 29°C), Playa del Carmen (30°C, sea 29°C), Aruba (29°C, sea 29°C), Cancun (29°C, sea 29°C), Miami (29°C, sea 29°C). See the full ranking for September.
Boa Vista or Sal: which suits you?
Boa Vista is the hotter choice, averaging 29°C by day compared with Sal's 27°C. That makes it a better fit if daytime warmth is your priority, but Sal may feel more manageable for spending time outdoors. The trade-off reverses at night: Sal averages 26°C, while Boa Vista averages 25°C, so the cooler daytime option does not bring cooler evenings. Sal also has a slight advantage on rain, with 5 rainy days against Boa Vista's 6, though neither is a rain-free choice. Sea temperatures are 27°C in both destinations, so there is no temperature advantage to choosing either island for swimming.
What to pack and how to plan your days
Pack light, breathable clothes and favour accommodation with cooling, as the average night temperature of 25°C offers little relief from the daytime warmth. For walking or other active plans, aim for the cooler ends of the day rather than pushing through midday heat. Average sunshine of 6.4 hours leaves scope for outdoor time, but it is better to keep your schedule flexible than to expect uninterrupted sun. Bring sun protection alongside a light rain layer, and have an indoor alternative ready. September suits travellers comfortable with warmth after dark; it is less appealing if cool evenings are an important part of your holiday.
A little more detail
Cape Verde in September FAQs
Plain answers, grounded in the averages.
Where is the hottest place in Cape Verde in September?
Boa Vista is the warmest of the 2 places we track in Cape Verde in September with an average high of 29.4°C; Sal is the coolest at 26.9°C.
Is the sea warm in Cape Verde in September?
The sea averages 22°C or more at Boa Vista (27°C), Sal (27°C) in September.
Is the sea warm enough for swimming in September?
Yes. The sea averages 27°C around both Boa Vista and Sal, making September a good fit if you prefer warm water. Choose between them on daytime heat and rain rather than sea temperature; these averages do not tell you about swimming conditions.
How much warmer is Cape Verde than London in September?
Cape Verde averages 28°C by day, compared with London's 19°C, so expect a noticeably hotter holiday rather than mild autumn weather. Nights in Cape Verde average 25°C too, which means packing for warm evenings as well as hot afternoons.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid), 1991-2020
Averages computed from daily values at 2 destination points.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C