Climate averages 1991–2020
Cayenne weather
in May.
A hot, very wet month: the 9th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Cayenne: daytime highs average 28.2°C and nights cool to about 23.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 411 mm of rain on roughly 29 days, which makes May a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 20 min on an average May day.
The nearest other city in this atlas is Paramaribo (330 km away). In May its highs average 29.0°C, 0.8°C warmer than Cayenne, with 258 mm of rain.
From May to June, average highs rise by 0.1°C to 28.3°C, and monthly rainfall falls from 411 mm to 343 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Paramaribo in MaySuriname · 330 kmHigh 29.0°C · Low 24.0°C · 258 mm rain
- Macapá in MayBrazil · 563 kmHigh 28.4°C · Low 23.6°C · 357 mm rain
- Santana in MayBrazil · 568 kmHigh 28.6°C · Low 23.6°C · 324 mm rain
- Georgetown in MayGuyana · 676 kmHigh 27.7°C · Low 24.7°C · 253 mm rain
- Breves in MayBrazil · 764 kmHigh 29.2°C · Low 23.6°C · 286 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.