Cayenne, FRENCH GUYANA and its best beaches
Climate - Temperatures and rainfall - Atlantic Ocean
Cayenne: Temperatures during the day, at night, rain and bathing conditions
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January Day temperature  85°F / 29°C |
Night temp.  74°F / 23°C |
Bathing temperature  81°F / 27°C |
Rain  366 mm |
Conditions  
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February Day temperature 85°F / 29°C |
Night temp. 74°F / 23°C |
Bathing temperature 81°F / 27°C |
Rain 312 mm |
Conditions
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March Day temperature 85°F / 29°C |
Night temp. 74°F / 23°C |
Bathing temperature 81°F / 27°C |
Rain 401 mm |
Conditions
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April Day temperature 86°F / 30°C |
Night temp. 76°F / 24°C |
Bathing temperature 83°F / 28°C |
Rain 480 mm |
Conditions
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May Day temperature 85°F / 29°C |
Night temp. 74°F / 23°C |
Bathing temperature 83°F / 28°C |
Rain 551 mm |
Conditions
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June Day temperature 88°F / 31°C |
Night temp. 74°F / 23°C |
Bathing temperature 83°F / 28°C |
Rain 394 mm |
Conditions
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July Day temperature 88°F / 31°C |
Night temp. 74°F / 23°C |
Bathing temperature 83°F / 28°C |
Rain 175 mm |
Conditions 
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August Day temperature 90°F / 32°C |
Night temp. 74°F / 23°C |
Bathing temperature 81°F / 27°C |
Rain 071 mm |
Conditions  
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September Day temperature 92°F / 33°C |
Night temp. 74°F / 23°C |
Bathing temperature 81°F / 27°C |
Rain 030 mm |
Conditions
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October Day temperature 92°F / 33°C |
Night temp. 74°F / 23°C |
Bathing temperature 85°F / 29°C |
Rain 033 mm |
Conditions
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November Day temperature 90°F / 32°C |
Night temp. 74°F / 23°C |
Bathing temperature 83°F / 28°C |
Rain 117 mm |
Conditions
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December Day temperature 86°F / 30°C |
Night temp. 74°F / 23°C |
Bathing temperature 81°F / 27°C |
Rain 272 mm |
Conditions
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French Guyana : climate and when to go to Cayenne
Tropical (equatorial) climate, warm and humid, seasonal temperature fluctuations, all year round, temperature oscillates around 79°F. The different seasons are marked only by the rains. The dry season runs from mid-July to December and March. In January and February, the sun and the tropical showers follow one another. The rainy season is from April to mid-July. On the coast, the damp heat is tempered by the trade winds, but the nights are cool and damp. No cyclones in French Guiana.
| January Avoid |
February Avoid |
March Avoid |
April Avoid |
May Avoid |
June Avoid |
July Risky |
August Pecfect |
September Pecfect |
October Pecfect |
November Acceptable |
December Avoid |
When to go? The hottest month for the beach, lazing around and swimming is October. Check the precipitations because showers are possible but the sun returns quickly, otherwise other periods are possible. The coolest month is January, if you can not stand the heat too much. The driest month of the year is September, if you do not like the rain at all.
Click on
Cayenne to display its climate.
Graphs and temperature curves with average precipitation over the year
Precipitation, rainfall, cyclone: FRENCH GUYANA
Temperatures of bathing water around Cayenne
Landmarks
Perfect conditions to enjoy the beach.
Favorable conditions for enjoying the beach. Cloudy with sunny spells and thunderstorms. Very strong tropical or monsoon rains.
Months at risk of cyclones with alerts level 1 to 5. Nice swimming at more than 26°C / 79°F. Everything is perfect for traveling.No cyclone risk for this country
Atlantic Ocean
Climate September 2025
Cayenne sunshine in summer and winter
The sun at its zenith, that means well perpendicular to the surface of the Earth, sending 100% of radiation and heat. Cayenne receives in winter (january), 87% of sun power and 94% during summer time (july).
The average temperature and sunshine deviations between summer and winter are 7%. This small gap means that the temperature at sea does not really vary and that the sea remains warm enough in summer and winter. The air is also hot all year round without great thermal amplitude.
Average temperatures and rainfall for a stay in September
On the left, the averages observed every month of September on the French Guyana beaches. The trends for next month are, the same daytime average temperatures, a bathing water in Atlantic Ocean which takes a few degrees, more abundant rains with nights as temperate as this month.
Sunset and sunrise times for FRENCH GUYANA
Local time : September 2025, Thursday 18, 06:16 AM
Sunrise time : 06:21 am, point A
Sunset time : 6:24 pm, point B
Duration of daylight : 12:03 / 24:00
Jet lag : GMT-3
The average monthly UV index of FRENCH GUYANA
What is the period of mosquitoes virulence over the year?
Weather forecast for Cayenne
Here are the current 5-day forecasts for Cayenne / Cayenne. Temperatures are spaced 3 hours apart for each day. The summary of the state of the sky gives the trend of the week. The sea temperature at is a monthly average. In lagoons or seashores where the bathing water is shallow, you can add some degrees.
Friday
September 19, 2025
8 am
80.6°F
27°C
Overcast clouds
Humidity 74%
Sea 81°F/27°C
Friday
September 19, 2025
11 am
79.4°F
27°C
Overcast clouds
Humidity 78%
Sea 81°F/27°C
Friday
September 19, 2025
2 pm
84°F
29°C
Broken clouds
Humidity 67%
Sea 81°F/27°C
Friday
September 19, 2025
5 pm
86°F
30°C
Scattered clouds
Humidity 60%
Sea 81°F/27°C
Friday
September 19, 2025
8 pm
85.5°F
30°C
Few clouds
Humidity 60%
Sea 81°F/27°C
Friday
September 19, 2025
11 pm
81.7°F
28°C
Few clouds
Humidity 74%
Sea 81°F/27°C
Saturday
September 20, 2025
8 am
80.6°F
27°C
Few clouds
Humidity 80%
Sea 81°F/27°C
Saturday
September 20, 2025
11 am
82°F
28°C
Scattered clouds
Humidity 74%
Sea 81°F/27°C
Saturday
September 20, 2025
2 pm
84°F
29°C
Scattered clouds
Humidity 69%
Sea 81°F/27°C
Saturday
September 20, 2025
5 pm
86.8°F
31°C
Scattered clouds
Humidity 63%
Sea 81°F/27°C
Saturday
September 20, 2025
8 pm
86.2°F
31°C
Few clouds
Humidity 63%
Sea 81°F/27°C
Saturday
September 20, 2025
11 pm
82.4°F
29°C
Clear sky
Humidity 75%
Sea 81°F/27°C
Sunday
September 21, 2025
8 am
81°F
28°C
Clear sky
Humidity 75%
Sea 81°F/27°C
Sunday
September 21, 2025
11 am
81.6°F
28°C
Overcast clouds
Humidity 71%
Sea 81°F/27°C
Sunday
September 21, 2025
2 pm
83.1°F
29°C
Broken clouds
Humidity 69%
Sea 81°F/27°C
Sunday
September 21, 2025
5 pm
86.4°F
31°C
Broken clouds
Humidity 62%
Sea 81°F/27°C
Sunday
September 21, 2025
8 pm
86.7°F
31°C
Scattered clouds
Humidity 62%
Sea 81°F/27°C
Sunday
September 21, 2025
11 pm
82.7°F
29°C
Few clouds
Humidity 74%
Sea 81°F/27°C
Monday
September 22, 2025
8 am
79.2°F
27°C
Clear sky
Humidity 76%
Sea 81°F/27°C
Monday
September 22, 2025
11 am
80.3°F
27°C
Broken clouds
Humidity 71%
Sea 81°F/27°C
Monday
September 22, 2025
2 pm
83.8°F
29°C
Scattered clouds
Humidity 66%
Sea 81°F/27°C
Monday
September 22, 2025
5 pm
86.4°F
31°C
Clear sky
Humidity 62%
Sea 81°F/27°C
Monday
September 22, 2025
8 pm
85.7°F
30°C
Clear sky
Humidity 64%
Sea 81°F/27°C
Monday
September 22, 2025
11 pm
82.1°F
28°C
Few clouds
Humidity 76%
Sea 81°F/27°C
Tuesday
September 23, 2025
8 am
81°F
28°C
Clear sky
Humidity 74%
Sea 81°F/27°C
Tuesday
September 23, 2025
11 am
80.5°F
27°C
Clear sky
Humidity 74%
Sea 81°F/27°C
Weather uncertainties 2025 to go to Cayenne ?
When traveling in the tropics as a seaside, rain is not welcome. If you see this indicator, with possible storms, that does not mean that it will rain all day long. When we observe the local rainfall, it is either really zero or very weak. Meteorologists prefer to be pessimistic. So observe below, the skies photographed during a week announced stormy in Asia. It did not rain once. I invite you to integrate this parameter before going to Cayenne for a good trip to the sun!
