Cayenne weather in August
In August, Cayenne has daytime highs averaging 30 °C, nights around 24 °C, with 18 wet days, and a sea temperature of 28 °C. Figures are 1991–2020 climate normals.
- 30.0°C Average high
- 23.7°C Average low
- 18days Wet days
- 122mm Rainfall
- 28.1°C Sea temperature
- 12h Daylight
Daily temperatures through August
How August develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 August | 29.5 °C | 23.5 °C | 65 % |
| 11–20 August | 29.9 °C | 23.7 °C | 59 % |
| 21–31 August | 30.4 °C | 23.9 °C | 48 % |
- Rain is most likely over days 1–10 of August (65 % of days) and least likely over days 21–31 (48 %).
What to expect
| Measure | Typical August | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 100 % |
| Days above 30 °C | 16 of 31 | 50 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 18 of 31 | 56 % |
Conditions in August
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 33 °C |
| Record low (1991–2020) | 22 °C |
| Relative humidity | 82 % |
| Wind speed | 14 km/h |
| Cloud cover | 46 % |
August compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| June | 28.2 °C | 367 mm | 77 % |
| July | 28.8 °C | 243 mm | 60 % |
| August | 30.0 °C | 122 mm | 46 % |
| September | 31.1 °C | 51 mm | 40 % |
| October | 31.3 °C | 58 mm | 48 % |
See all twelve months for Cayenne
- August is the 3rd warmest month here.
- It is the 3rd driest month of the year.
- It ranks 2nd for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 18 of 31 days — 56 % of the month.
- Nights are about 6.3 °C cooler than the middle of the day.
- The hottest August day on record since 1991 reached 33 °C, 3.0 °C above the usual daytime high.
- Beach score: 69 / 100 — see how this is calculated.
QuestionsAugust in Cayenne, answered
How warm is Cayenne in August?
Daily highs average 30 °C and nights fall to about 24 °C, a spread of 6.3 °C between afternoon and dawn. That makes August the 4th warmest month of the year here.
Does it rain much in Cayenne in August?
August averages 122 mm of rain, spread over about 18 of the 31 days — 56 % of the month. Cloud cover averages 46 % of the sky.
Is the sea warm enough to swim in August?
The sea averages 28 °C off Cayenne in August. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in August?
Cayenne averages 12 hours between sunrise and sunset in August. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.