How many sunny days does Cayenne have per year?

Cayenne averages approximately 210 sunny days per year, based on historical climate data.

What is the air quality in Cayenne?

Cayenne has an annual PM2.5 concentration of 11.1 µg/m³, classified as "Fair" by WHO standards. Slightly above WHO targets. Sensitive individuals may notice effects.

Guyane

Cayenne · French Guiana

The capital and largest city of French Guiana.

Small city

76K

37 km²

01:09 UTC-3

EUR

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Cayenne, French Guiana is a 76K-resident city with 210 sunny days and 0 frost days annually and an annual PM2.5 of 11.1 µg/m³. The capital and largest city of French Guiana.

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Climate

Feels-like °C

Dinner outside

Climate Lab·Cayenne

Monthly climate metrics across temperature, precipitation, wind, and UV.

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Metric	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Temperature
Daily high°C	27	28	28	28	28	29	29	30	31	31	29	28	29
Daily mean°C	26	27	27	27	27	27	27	28	29	29	27	27	27
Daily low°C	25	25	26	25	26	25	25	26	26	27	26	26	26
Thermal comfort
High feelsDaily high feels-like°C	33	32	33	34	34	36	36	36	37	37	36	34	35
Mean feelsDaily mean feels-like°C	28	27	29	29	30	31	31	32	33	33	31	30	30
Low feelsDaily low feels-like°C	23	24	24	24	25	25	25	26	26	26	25	25	25
Humidity
HumidityRelative humidity%	84	82	79	85	86	84	82	75	72	75	83	84	81
Dewpoint°C	23.4	23.3	23.4	23.8	24.3	24.0	24.0	23.7	23.7	23.9	24.2	24.0	23.8
Precipitation
Rainfallmm	341	163	260	347	557	293	279	66	27	68	195	406	3001
Rain days≥1mm	28	24	29	28	30	30	28	14	9	16	27	30	293
Wind
Wind avgm/s	5.3	5.4	5.2	4.6	4.4	3.3	3.2	3.8	4.6	4.2	4.0	4.6	4.4
Wind gustsm/s	6.8	6.9	6.9	6.7	6.1	5.2	5.0	5.6	5.8	6.0	5.8	6.3	6.1
Sun & UV
Sunshinehrs/day	8.6	8.0	8.8	8.6	8.0	8.6	8.8	9.7	9.8	9.7	8.9	9.0	8.9
Clear skyindex	27%	22%	35%	21%	25%	36%	38%	54%	63%	52%	31%	31%	36%
UV indexmax avg	7.5	6.9	9.1	8.0	7.3	7.6	8.3	10.0	10.7	9.9	8.8	6.3	8.4

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Lifestyle Calendar·Cayenne

Outdoor activities in Cayenne are challenging most of the year. May through December are the toughest stretch. Running is tough year-round, while even walking manages 4/12 months.

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Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Annual

0/12

Dinner Outside

59Jan: 59% viability

60Feb: 60% viability

60Mar: 60% viability

46Apr: 46% viability

39May: 39% viability

46Jun: 46% viability

50Jul: 50% viability

52Aug: 52% viability

53Sep: 53% viability

49Oct: 49% viability

46Nov: 46% viability

49Dec: 49% viability

0/12

Dinner Outside

59Jan: 59% viability

60Feb: 60% viability

60Mar: 60% viability

46Apr: 46% viability

39May: 39% viability

46Jun: 46% viability

50Jul: 50% viability

52Aug: 52% viability

53Sep: 53% viability

49Oct: 49% viability

46Nov: 46% viability

49Dec: 49% viability

51%

Humid

0/12

Lunch Outside

16Jan: 16% viability

19Feb: 19% viability

19Mar: 19% viability

10Apr: 10% viability

6May: 6% viability

7Jun: 7% viability

10Jul: 10% viability

24Aug: 24% viability

34Sep: 34% viability

29Oct: 29% viability

12Nov: 12% viability

9Dec: 9% viability

0/12

Lunch Outside

16Jan: 16% viability

19Feb: 19% viability

19Mar: 19% viability

10Apr: 10% viability

6May: 6% viability

7Jun: 7% viability

10Jul: 10% viability

24Aug: 24% viability

34Sep: 34% viability

29Oct: 29% viability

12Nov: 12% viability

9Dec: 9% viability

16%

Humid

4/12

Walking

82Jan: 82% viability

86Feb: 86% viability

73Mar: 73% viability

65Apr: 65% viability

62May: 62% viability

41Jun: 41% viability

34Jul: 34% viability

14Aug: 14% viability

10Sep: 10% viability

11Oct: 11% viability

39Nov: 39% viability

57Dec: 57% viability

4/12

Walking

82Jan: 82% viability

86Feb: 86% viability

73Mar: 73% viability

65Apr: 65% viability

62May: 62% viability

41Jun: 41% viability

34Jul: 34% viability

14Aug: 14% viability

10Sep: 10% viability

11Oct: 11% viability

39Nov: 39% viability

57Dec: 57% viability

48%

Humid

0/12

Running

26Jan: 26% viability

29Feb: 29% viability

16Mar: 16% viability

14Apr: 14% viability

14May: 14% viability

7Jun: 7% viability

4Jul: 4% viability

0Aug: 0% viability

0Sep: 0% viability

1Oct: 1% viability

6Nov: 6% viability

13Dec: 13% viability

0/12

Running

26Jan: 26% viability

29Feb: 29% viability

16Mar: 16% viability

14Apr: 14% viability

14May: 14% viability

7Jun: 7% viability

4Jul: 4% viability

0Aug: 0% viability

0Sep: 0% viability

1Oct: 1% viability

6Nov: 6% viability

13Dec: 13% viability

11%

Rain

Tap any month for details · Click activity name for overview

ComfortableModerateUncomfortable

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Cayenne · French Guiana

Climate

Climate Lab·Cayenne

Lifestyle Calendar·Cayenne

Air Quality Profile

Air Quality Profile

Who thrives in Cayenne

Frequently asked about Cayenne