Cayenne Temperature by Month
Cayenne, French Guiana has a consistently very warm climate year-round, with daytime highs averaging 31°C (88°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Cayenne Monthly Temperatures
The temperature in Cayenne remains steady throughout the year, providing a consistently very warm climate. Maximum daytime temperatures range from a very warm 33°C (91°F) in October to a comfortable 29°C (84°F) in July. Nights are mild year-round, with lows ranging from 24°C (75°F) in October to 23°C (73°F) in July.
The chart below illustrates the average maximum day and minimum night temperatures in Cayenne by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. October, the city's warmest month, averages 256 hours of sunshine.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
49-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in July
Historical Cayenne Temperatures: 1976-2026
Browse day-by-day temperature records for Cayenne spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Cayenne vs French Guiana
The map below shows the annual temperature across French Guiana. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Cayenne vs World: Temperature Compared
Cayenne's average annual maximum temperature is 31°C (88°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Cayenne?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Cayenne, July is the coolest month, with average highs of 31°C (88°F) and humidity around 78% — considered high. In October, the warmest month, temperatures average 33°C (91°F) with 71% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Cayenne's weather — including monthly rainfall, sunshine hours, and humidity — visit our Cayenne climate page.
