Cayenne weather in December
In December, Cayenne sees average daytime highs of 28°C and overnight lows near 25°C, with 253 mm of rain across 26.5 wet days and about 11.7 hours of daylight. It is the 7th-warmest and 4th-wettest month of the year here.
Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 15% of the time in December, and the air most often feels oppressive.
Daylight stretches from about 11 h 42 min at the start of December to 11 h 42 min by month's end. Set against the rest of the year, December is Cayenne's 6th-clearest and 5th-windiest month. For the whole year in context, see Cayenne's year-round climate.
- Daytime high
- 28°
- 7th warmest
- Overnight low
- 25°
- 4th coldest
- Rainfall
- 253 mm
- 26.5 wet days
- Daylight
- 11 h 42 min
- 6:34 AM – 6:17 PM
- Cloud cover
- 69%
- 6th clearest
- Wind
- 16 km/h
- 5th windiest
- Solar energy
- 4.57 kWh/m²
- Travel score
- 3.8
- out of 10
Cayenne is commune and capital city of French Guiana.
- Density
- 2,608/km²
- people per km²
- Founded
- 1664
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Day-to-day highs hold fairly steady near 28°C through the month.
A typical December day in Cayenne reaches about 28°C in the afternoon and slips back to 25°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 29 | 25 |
| 2 | 29 | 25 |
| 3 | 29 | 25 |
| 4 | 28 | 25 |
| 5 | 28 | 25 |
| 6 | 28 | 25 |
| 7 | 28 | 25 |
| 8 | 28 | 25 |
| 9 | 28 | 25 |
| 10 | 28 | 25 |
| 11 | 28 | 25 |
| 12 | 28 | 25 |
| 13 | 28 | 25 |
| 14 | 28 | 25 |
| 15 | 28 | 25 |
| 16 | 28 | 25 |
| 17 | 28 | 25 |
| 18 | 28 | 25 |
| 19 | 28 | 25 |
| 20 | 28 | 25 |
| 21 | 28 | 25 |
| 22 | 28 | 25 |
| 23 | 28 | 25 |
| 24 | 28 | 25 |
| 25 | 28 | 25 |
| 26 | 28 | 25 |
| 27 | 28 | 25 |
| 28 | 28 | 25 |
| 29 | 28 | 25 |
| 30 | 28 | 25 |
| 31 | 28 | 25 |
How December really feels in Cayenne
Once humidity and wind are folded in, December averages 5 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Cayenne weather by month
How December compares with the rest of the year at a glance. December is the 7th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 25° | 244 | 26.6 | 11.7 | 4.0 |
| Feb | 27° / 25° | 205 | 22.3 | 11.8 | 4.2 |
| Mar | 28° / 25° | 173 | 23.9 | 12 | 4.3 |
| Apr | 28° / 25° | 258 | 25 | 12.1 | 4.0 |
| May | 28° / 25° | 411 | 29.1 | 12.2 | 3.5 |
| Jun | 28° / 25° | 344 | 28.5 | 12.3 | 3.5 |
| Jul | 29° / 25° | 186 | 24.8 | 12.3 | 4.0 |
| Aug | 30° / 25° | 67 | 13.9 | 12.2 | 5.0 |
| Sep | 30° / 25° | 23 | 7.2 | 12 | 5.5 |
| Oct | 30° / 25° | 40 | 10.1 | 11.9 | 5.1 |
| Nov | 29° / 25° | 122 | 19.6 | 11.8 | 4.2 |
| Dec | 28° / 25° | 253 | 26.5 | 11.7 | 3.8 |
Cloud cover in December
The sky is clear or mostly clear about 15% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 21% of December, with mostly cloudy or overcast conditions the remaining 65%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 41 | 41 | 41 | 41 | 41 | 41 | 40 | 39 | 39 | 38 | 37 | 37 | 37 | 35 | 34 | 34 | 34 | 33 | 33 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 |
| Cloudier (%) | 59 | 59 | 59 | 59 | 59 | 59 | 60 | 61 | 61 | 62 | 63 | 63 | 63 | 65 | 66 | 66 | 66 | 67 | 67 | 68 | 68 | 68 | 69 | 69 | 69 | 69 | 69 | 69 | 69 | 68 | 68 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 41 | 59 |
| 2 | 41 | 59 |
| 3 | 41 | 59 |
| 4 | 41 | 59 |
| 5 | 41 | 59 |
| 6 | 41 | 59 |
| 7 | 40 | 60 |
| 8 | 39 | 61 |
| 9 | 39 | 61 |
| 10 | 38 | 62 |
| 11 | 37 | 63 |
| 12 | 37 | 63 |
| 13 | 37 | 63 |
| 14 | 35 | 65 |
| 15 | 34 | 66 |
| 16 | 34 | 66 |
| 17 | 34 | 66 |
| 18 | 33 | 67 |
| 19 | 33 | 67 |
| 20 | 32 | 68 |
| 21 | 32 | 68 |
| 22 | 32 | 68 |
| 23 | 31 | 69 |
| 24 | 31 | 69 |
| 25 | 31 | 69 |
| 26 | 31 | 69 |
| 27 | 31 | 69 |
| 28 | 31 | 69 |
| 29 | 31 | 69 |
| 30 | 32 | 68 |
| 31 | 32 | 68 |
Chance of precipitation in December
Cayenne gets around 253 mm of rain over 26.5 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 86% and peaks near 89% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 77 | 78 | 79 | 79 | 80 | 81 | 82 | 82 | 83 | 84 | 84 | 85 | 86 | 87 | 87 | 88 | 88 | 88 | 88 | 88 | 89 | 89 | 89 | 89 | 89 | 89 | 89 | 89 | 89 | 89 | 89 |
| Rain chance (%) | |
|---|---|
| 1 | 77 |
| 2 | 78 |
| 3 | 79 |
| 4 | 79 |
| 5 | 80 |
| 6 | 81 |
| 7 | 82 |
| 8 | 82 |
| 9 | 83 |
| 10 | 84 |
| 11 | 84 |
| 12 | 85 |
| 13 | 86 |
| 14 | 87 |
| 15 | 87 |
| 16 | 88 |
| 17 | 88 |
| 18 | 88 |
| 19 | 88 |
| 20 | 88 |
| 21 | 89 |
| 22 | 89 |
| 23 | 89 |
| 24 | 89 |
| 25 | 89 |
| 26 | 89 |
| 27 | 89 |
| 28 | 89 |
| 29 | 89 |
| 30 | 89 |
| 31 | 89 |
Humidity in December
Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the oppressive band about 85% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Oppressive (%) | 78 | 78 | 78 | 79 | 79 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 83 | 84 | 85 | 85 | 86 | 87 | 87 | 88 | 89 | 89 | 90 | 90 | 91 | 91 | 92 | 92 | 93 | 93 | 93 |
| Miserable (%) | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 19 | 19 | 18 | 17 | 17 | 16 | 15 | 14 | 14 | 13 | 12 | 12 | 11 | 10 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 |
| Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|
| 1 | 0 | 78 | 22 |
| 2 | 0 | 78 | 22 |
| 3 | 0 | 78 | 22 |
| 4 | 0 | 79 | 21 |
| 5 | 0 | 79 | 21 |
| 6 | 0 | 79 | 21 |
| 7 | 0 | 80 | 20 |
| 8 | 0 | 81 | 19 |
| 9 | 0 | 81 | 19 |
| 10 | 0 | 82 | 18 |
| 11 | 1 | 82 | 17 |
| 12 | 1 | 82 | 17 |
| 13 | 1 | 83 | 16 |
| 14 | 1 | 84 | 15 |
| 15 | 1 | 85 | 14 |
| 16 | 1 | 85 | 14 |
| 17 | 1 | 86 | 13 |
| 18 | 1 | 87 | 12 |
| 19 | 1 | 87 | 12 |
| 20 | 1 | 88 | 11 |
| 21 | 1 | 89 | 10 |
| 22 | 1 | 89 | 10 |
| 23 | 1 | 90 | 9 |
| 24 | 1 | 90 | 9 |
| 25 | 1 | 91 | 8 |
| 26 | 1 | 91 | 8 |
| 27 | 1 | 92 | 7 |
| 28 | 1 | 92 | 7 |
| 29 | 1 | 93 | 6 |
| 30 | 1 | 93 | 6 |
| 31 | 1 | 93 | 6 |
Wind in December
Winds average 16 km/h in December.
Across December, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 15 | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 15 | light breeze |
| 2 | 15 | light breeze |
| 3 | 15 | light breeze |
| 4 | 16 | light breeze |
| 5 | 16 | light breeze |
| 6 | 16 | light breeze |
| 7 | 16 | light breeze |
| 8 | 16 | light breeze |
| 9 | 16 | light breeze |
| 10 | 16 | light breeze |
| 11 | 16 | light breeze |
| 12 | 16 | light breeze |
| 13 | 16 | light breeze |
| 14 | 16 | light breeze |
| 15 | 16 | light breeze |
| 16 | 16 | light breeze |
| 17 | 16 | light breeze |
| 18 | 16 | light breeze |
| 19 | 16 | light breeze |
| 20 | 16 | light breeze |
| 21 | 16 | light breeze |
| 22 | 17 | light breeze |
| 23 | 17 | light breeze |
| 24 | 17 | light breeze |
| 25 | 17 | light breeze |
| 26 | 17 | light breeze |
| 27 | 17 | light breeze |
| 28 | 17 | light breeze |
| 29 | 17 | light breeze |
| 30 | 17 | light breeze |
| 31 | 17 | light breeze |
Sunrise & sunset in December
Daylight runs from about 11 h 42 min at the start of December to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 0 minutes over December. Sunrise moves from 6:27 AM to 6:41 AM, and sunset from 6:11 PM to 6:24 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 |
| Sunrise (AM) | 6:27 | 6:28 | 6:28 | 6:28 | 6:29 | 6:29 | 6:30 | 6:30 | 6:31 | 6:31 | 6:32 | 6:32 | 6:33 | 6:33 | 6:34 | 6:34 | 6:35 | 6:35 | 6:35 | 6:36 | 6:36 | 6:37 | 6:37 | 6:38 | 6:38 | 6:39 | 6:39 | 6:40 | 6:40 | 6:41 | 6:41 |
| Sunset (PM) | 6:11 | 6:11 | 6:12 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:14 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:19 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 | 6:23 | 6:23 | 6:24 | 6:24 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.7 | 6:27 | 6:11 |
| 2 | 11.7 | 6:28 | 6:11 |
| 3 | 11.7 | 6:28 | 6:12 |
| 4 | 11.7 | 6:28 | 6:12 |
| 5 | 11.7 | 6:29 | 6:12 |
| 6 | 11.7 | 6:29 | 6:13 |
| 7 | 11.7 | 6:30 | 6:13 |
| 8 | 11.7 | 6:30 | 6:14 |
| 9 | 11.7 | 6:31 | 6:14 |
| 10 | 11.7 | 6:31 | 6:14 |
| 11 | 11.7 | 6:32 | 6:15 |
| 12 | 11.7 | 6:32 | 6:15 |
| 13 | 11.7 | 6:33 | 6:16 |
| 14 | 11.7 | 6:33 | 6:16 |
| 15 | 11.7 | 6:34 | 6:17 |
| 16 | 11.7 | 6:34 | 6:17 |
| 17 | 11.7 | 6:35 | 6:17 |
| 18 | 11.7 | 6:35 | 6:18 |
| 19 | 11.7 | 6:35 | 6:18 |
| 20 | 11.7 | 6:36 | 6:19 |
| 21 | 11.7 | 6:36 | 6:19 |
| 22 | 11.7 | 6:37 | 6:20 |
| 23 | 11.7 | 6:37 | 6:20 |
| 24 | 11.7 | 6:38 | 6:21 |
| 25 | 11.7 | 6:38 | 6:21 |
| 26 | 11.7 | 6:39 | 6:22 |
| 27 | 11.7 | 6:39 | 6:22 |
| 28 | 11.7 | 6:40 | 6:23 |
| 29 | 11.7 | 6:40 | 6:23 |
| 30 | 11.7 | 6:41 | 6:24 |
| 31 | 11.7 | 6:41 | 6:24 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 4.57 kWh/m².
For context, solar energy here swings from a low near 4.48 kWh/m² to a high of 6.26 kWh/m² in September across the year — December's 4.57 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 | 4.8 | 4.7 | 4.7 | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.9 | Bright |
| 2 | 4.9 | Bright |
| 3 | 4.9 | Bright |
| 4 | 4.8 | Bright |
| 5 | 4.8 | Bright |
| 6 | 4.8 | Bright |
| 7 | 4.8 | Bright |
| 8 | 4.7 | Bright |
| 9 | 4.7 | Bright |
| 10 | 4.7 | Bright |
| 11 | 4.7 | Bright |
| 12 | 4.7 | Bright |
| 13 | 4.6 | Bright |
| 14 | 4.6 | Bright |
| 15 | 4.6 | Bright |
| 16 | 4.5 | Bright |
| 17 | 4.5 | Bright |
| 18 | 4.5 | Bright |
| 19 | 4.5 | Bright |
| 20 | 4.5 | Bright |
| 21 | 4.5 | Bright |
| 22 | 4.4 | Bright |
| 23 | 4.4 | Bright |
| 24 | 4.4 | Bright |
| 25 | 4.4 | Bright |
| 26 | 4.4 | Bright |
| 27 | 4.4 | Bright |
| 28 | 4.4 | Bright |
| 29 | 4.4 | Bright |
| 30 | 4.4 | Bright |
| 31 | 4.4 | Bright |
Hazard calendar for Cayenne
In December, Cayenne sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
Cayenne's rainy season runs April–July, when most of the year's rain falls.
Is December a good time to visit Cayenne?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a weaker month for outdoor sightseeing in Cayenne.
What to pack for Cayenne in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Cayenne sees daytime highs around 28°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.
Sea temperature near Cayenne in December
The nearest coast averages about 27°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 21 km away) is warmest in July at about 28°C and coldest in January near 27°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Warm | Tropical | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 27 | Warm |
| Mar | 27 | Warm |
| Apr | 27 | Warm |
| May | 28 | Warm |
| Jun | 28 | Warm |
| Jul | 28 | Tropical |
| Aug | 28 | Tropical |
| Sep | 28 | Warm |
| Oct | 28 | Tropical |
| Nov | 28 | Warm |
| Dec | 27 | Warm |
UV index in Cayenne in December
Clear-sky midday UV in December peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Cayenne peaks around April 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 11 at about 10 (extreme).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 13 | 13 | 14 | 14 | 13 | 11 | 11 | 11 | 12 | 12 | 11 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 13 | Extreme |
| Mar | 14 | Extreme |
| Apr | 14 | Extreme |
| May | 13 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 10 | Extreme |
Air quality in Cayenne in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Cayenne is worst in February — around 28 µg/m³ PM2.5 (moderate), about 4.0× the cleanest month (August, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 26 | 28 | 26 | 26 | 21 | 12 | 8 | 7 | 8 | 10 | 12 | 21 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 26 | Moderate |
| Feb | 28 | Moderate |
| Mar | 26 | Moderate |
| Apr | 26 | Moderate |
| May | 21 | Moderate |
| Jun | 12 | Moderate |
| Jul | 8 | Good |
| Aug | 7 | Good |
| Sep | 8 | Good |
| Oct | 10 | Good |
| Nov | 12 | Good |
| Dec | 21 | Moderate |
Where is Cayenne?
Cayenne sits at 4.9°N, 52.3°W, 7 m above sea level, in French Guiana. The nearest listed city is Rémire-Montjoly, 8.0 km away.
Topography around Cayenne
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cayenne.
Within 3 km, the terrain around Cayenne has only modest variations in elevation — a maximum elevation change of 84 m around an average of 4 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 250 m; within 80 km, significant variations in elevation — a maximum elevation change of 487 m.
The land around Cayenne is covered by water (58%) and artificial surfaces (20%) within 3 km, water (55%) and trees (30%) within 16 km, and trees (53%) and water (41%) within 80 km.
French Guiana travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E
- 220 V · 50 Hz
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Cayenne (4.9381°, -52.3346°, elevation 7 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).