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
Cayenne enjoys a stable climate with temperatures staying pretty much the same throughout the year. Maximum daytime temperatures range from a comfortable 29°C (84°F) in July to a very warm 33°C (91°F) in October. Nights are consistently cool, with lows between 24°C (75°F) and 23°C (73°F).
The chart below illustrates the average maximum day and minimum night temperatures in Cayenne by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. October, the warmest month of the year, receives 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:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
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.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Cayenne's weather — including monthly rainfall, sunshine hours, and humidity — visit our Cayenne climate page.
