French Guiana weather by month

Check out French Guiana weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in French Guiana (°F)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
84°F maximum daytime temperature in January in French Guiana (Cayenne)84
84°F maximum daytime temperature in February in French Guiana (Cayenne)84
84°F maximum daytime temperature in March in French Guiana (Cayenne)84
86°F maximum daytime temperature in April in French Guiana (Cayenne)86
84°F maximum daytime temperature in May in French Guiana (Cayenne)84
86°F maximum daytime temperature in June in French Guiana (Cayenne)86
88°F maximum daytime temperature in July in French Guiana (Cayenne)88
90°F maximum daytime temperature in August in French Guiana (Cayenne)90
90°F maximum daytime temperature in September in French Guiana (Cayenne)90
90°F maximum daytime temperature in October in French Guiana (Cayenne)90
88°F maximum daytime temperature in November in French Guiana (Cayenne)88
86°F maximum daytime temperature in December in French Guiana (Cayenne)86
Min temperature (night-time)
73°F minimum night-time temperature in January in French Guiana (Cayenne)73
73°F minimum night-time temperature in February in French Guiana (Cayenne)73
73°F minimum night-time temperature in March in French Guiana (Cayenne)73
75°F minimum night-time temperature in April in French Guiana (Cayenne)75
73°F minimum night-time temperature in May in French Guiana (Cayenne)73
73°F minimum night-time temperature in June in French Guiana (Cayenne)73
73°F minimum night-time temperature in July in French Guiana (Cayenne)73
72°F minimum night-time temperature in August in French Guiana (Cayenne)72
73°F minimum night-time temperature in September in French Guiana (Cayenne)73
73°F minimum night-time temperature in October in French Guiana (Cayenne)73
73°F minimum night-time temperature in November in French Guiana (Cayenne)73
73°F minimum night-time temperature in December in French Guiana (Cayenne)73
Heat & Humidity
High heat & humidity in January in French Guiana (Cayenne)H
High heat & humidity in February in French Guiana (Cayenne)H
High heat & humidity in March in French Guiana (Cayenne)H
High heat & humidity in April in French Guiana (Cayenne)H
High heat & humidity in May in French Guiana (Cayenne)H
Very high heat & humidity in June in French Guiana (Cayenne)VH
Very high heat & humidity in July in French Guiana (Cayenne)VH
Very high heat & humidity in August in French Guiana (Cayenne)VH
Very high heat & humidity in September in French Guiana (Cayenne)VH
Very high heat & humidity in October in French Guiana (Cayenne)VH
Very high heat & humidity in November in French Guiana (Cayenne)VH
High heat & humidity in December in French Guiana (Cayenne)H
Sea temperature
81°F sea temperature in January in French Guiana (Cayenne)81
81°F sea temperature in February in French Guiana (Cayenne)81
81°F sea temperature in March in French Guiana (Cayenne)81
81°F sea temperature in April in French Guiana (Cayenne)81
81°F sea temperature in May in French Guiana (Cayenne)81
82°F sea temperature in June in French Guiana (Cayenne)82
82°F sea temperature in July in French Guiana (Cayenne)82
82°F sea temperature in August in French Guiana (Cayenne)82
82°F sea temperature in September in French Guiana (Cayenne)82
82°F sea temperature in October in French Guiana (Cayenne)82
82°F sea temperature in November in French Guiana (Cayenne)82
81°F sea temperature in December in French Guiana (Cayenne)81

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Sunshine & UV index in French Guiana

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
12 hours of daylight per day in January in French Guiana (Cayenne)12
12 hours of daylight per day in February in French Guiana (Cayenne)12
12 hours of daylight per day in March in French Guiana (Cayenne)12
12 hours of daylight per day in April in French Guiana (Cayenne)12
12 hours of daylight per day in May in French Guiana (Cayenne)12
12 hours of daylight per day in June in French Guiana (Cayenne)12
12 hours of daylight per day in July in French Guiana (Cayenne)12
12 hours of daylight per day in August in French Guiana (Cayenne)12
12 hours of daylight per day in September in French Guiana (Cayenne)12
12 hours of daylight per day in October in French Guiana (Cayenne)12
12 hours of daylight per day in November in French Guiana (Cayenne)12
12 hours of daylight per day in December in French Guiana (Cayenne)12
UV Index (Maximum)
UV (maximum) index 11+ (Extreme) in January in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in February in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in March in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in April in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in May in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in June in French Guiana (Cayenne)11
UV (maximum) index 11 (Extreme) in July in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in August in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in September in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in October in French Guiana (Cayenne)11
UV (maximum) index 11+ (Extreme) in November in French Guiana (Cayenne)11
UV (maximum) index 11 (Extreme) in December in French Guiana (Cayenne)11

Rainfall in French Guiana

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
20 days with some rainfall in January in French Guiana (Cayenne)20
16 days with some rainfall in February in French Guiana (Cayenne)16
22 days with some rainfall in March in French Guiana (Cayenne)22
21 days with some rainfall in April in French Guiana (Cayenne)21
26 days with some rainfall in May in French Guiana (Cayenne)26
23 days with some rainfall in June in French Guiana (Cayenne)23
18 days with some rainfall in July in French Guiana (Cayenne)18
9 days with some rainfall in August in French Guiana (Cayenne)9
4 days with some rainfall in September in French Guiana (Cayenne)4
4 days with some rainfall in October in French Guiana (Cayenne)4
11 days with some rainfall in November in French Guiana (Cayenne)11
18 days with some rainfall in December in French Guiana (Cayenne)18
Average monthly rainfall (inches)
14.4 inches monthly rainfall in January in French Guiana (Cayenne)14.4
12.0 inches monthly rainfall in February in French Guiana (Cayenne)12.0
14.7 inches monthly rainfall in March in French Guiana (Cayenne)14.7
17.3 inches monthly rainfall in April in French Guiana (Cayenne)17.3
21.4 inches monthly rainfall in May in French Guiana (Cayenne)21.4
16.2 inches monthly rainfall in June in French Guiana (Cayenne)16.2
7.9 inches monthly rainfall in July in French Guiana (Cayenne)7.9
3.8 inches monthly rainfall in August in French Guiana (Cayenne)3.8
1.6 inches monthly rainfall in September in French Guiana (Cayenne)1.6
1.8 inches monthly rainfall in October in French Guiana (Cayenne)1.8
4.9 inches monthly rainfall in November in French Guiana (Cayenne)4.9
11.6 inches monthly rainfall in December in French Guiana (Cayenne)11.6

More about French Guiana

French Guiana by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for French Guiana

The climate guide for French Guiana, represented by Cayenne, (Cayenne) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

French Guiana climate overview

French Guiana is a small country in South America bordering Brazil and Suriname, with an Atlantic coastline at its northern edge. It consists largely of lowland plains with small hills to the south, and has an equatorial rainforest interior.

Expect a climate of Turkish bath-style sultriness throughout the year, though conditions are at their most steamy during the rainy season, which stretches from December to mid-July.

What to pack for French Guiana

Take very light cotton clothing and reliable waterproofs if you are visiting in the long wet season. Add a wrap for cooler evenings.

Compare French Guiana weather with the UK

The weather chart below compares the average monthly maximum daytime temperature for French Guiana (Cayenne) and the UK (London).

Maximum daytime temperature (°F)

French Guiana (Cayenne)
UK (London)
84
45
84
45
84
50
86
55
84
63
86
68
88
72
90
72
90
66
90
59
88
50
86
46
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Metric (°C)  |  Imperial (°F)

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