Climate averages 1991–2020
Cayenne weather
in December.
A hot, very wet month: the 6th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in Cayenne: daytime highs average 28.4°C and nights cool to about 23.6°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 253 mm of rain on roughly 27 days, which makes December a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 50 min on an average December day.
The nearest other city in this atlas is Paramaribo (330 km away). In December its highs average 28.7°C, about as warm as Cayenne, with 140 mm of rain.
From December to January, average highs fall by 0.8°C to 27.6°C, and monthly rainfall falls from 253 mm to 244 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Cayenne climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.6°C23.3°C | 23.3°C | 244 | 26.6 | 11.912 h |
| February | 27.6°C23.5°C | 23.5°C | 205 | 22.5 | 12.012 h |
| March | 28.1°C23.8°C | 23.8°C | 173 | 23.9 | 12.112 h |
| April | 28.3°C23.8°C | 23.8°C | 257 | 25.0 | 12.212 h |
| May | 28.2°C23.6°C | 23.6°C | 411 | 29.1 | 12.312 h |
| June | 28.3°C23.2°C | 23.2°C | 343 | 28.5 | 12.412 h |
| July | 28.9°C23.2°C | 23.2°C | 186 | 24.8 | 12.412 h |
| August | 30.1°C23.7°C | 23.7°C | 67 | 13.9 | 12.312 h |
| September | 31.3°C24.2°C | 24.2°C | 23 | 7.2 | 12.112 h |
| October | 31.5°C24.3°C | 24.3°C | 39 | 10.1 | 12.012 h |
| November | 30.1°C24.1°C | 24.1°C | 122 | 19.6 | 11.912 h |
| December, selected | 28.4°C23.6°C | 23.6°C | 253 | 26.5 | 11.812 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Paramaribo in DecemberSuriname · 330 kmHigh 28.7°C · Low 23.8°C · 140 mm rain
- Macapá in DecemberBrazil · 563 kmHigh 30.1°C · Low 24.3°C · 128 mm rain
- Santana in DecemberBrazil · 568 kmHigh 30.4°C · Low 24.3°C · 105 mm rain
- Georgetown in DecemberGuyana · 676 kmHigh 27.2°C · Low 24.4°C · 207 mm rain
- Breves in DecemberBrazil · 764 kmHigh 31.6°C · Low 24.4°C · 125 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Cayenne) is explained once on the Cayenne year overview and on the Sources, method and limits page.