Climate Overview
The climate in Cayenne is hot. The average annual temperature is 27°C and approximately 2948mm of precipitation falls per year. Cayenne receives a notable amount of rainfall throughout the year, including during its driest month. Cayenne sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Cayenne has relatively stable temperatures year-round, staying within a 6°C range. The warmest month is September, when average highs reach 31°C and the mean temperature sits around 28°C. June is the coolest month, with minimum temperatures around 25°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows.
Precipitation
Cayenne is a very wet location, receiving approximately 2948mm of precipitation annually, which averages out to around 246mm per month. The wettest month is May, averaging 559mm of rainfall. June and April also tend to see above-average precipitation. The driest month is September, with just 31mm. That's 527mm less than May, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Cayenne is mildly breezy, with an average annual wind speed of 20km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 23km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 22km/h in winter, 21km/h in spring, 17km/h in summer, 19km/h in autumn.
Seasons
90 days until Summer
It is currently spring in Cayenne, which began on March 20, 2026. Cayenne sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in September at around 31°C, while the coldest stretch bottoms out in June near 25°C. Summer is next, beginning on June 21, 2026 — 90 days from now.
Spring
Temperatures range from 25 to 28°C. Rainfall is heavy, totalling around 1167mm across the season with a monthly average of 389mm. Winds are moderate at around 21km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 30°C. Rainfall is heavy, totalling around 672mm across the season with a monthly average of 224mm. Winds are moderate at around 17km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 31°C. Precipitation is moderate at around 240mm for the season, averaging 80mm per month. Winds are moderate at around 19km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 25 to 28°C. Rainfall is heavy, totalling around 869mm across the season with a monthly average of 290mm. Winds are moderate at around 22km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Cayenne based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
