Climate Overview
The climate in Sinnamary is hot. The average annual temperature is 26°C and approximately 2876mm of precipitation falls per year. Sinnamary receives a notable amount of rainfall throughout the year, including during its driest month. Sinnamary sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Sinnamary has relatively stable temperatures year-round, staying within a 8°C range. The warmest month is September, when average highs reach 32°C and the mean temperature sits around 27°C. July is the coolest month, with minimum temperatures around 24°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows.
Precipitation
Sinnamary is a very wet location, receiving approximately 2876mm of precipitation annually, which averages out to around 240mm per month. The wettest month is May, averaging 524mm of rainfall. June and April also tend to see above-average precipitation. The driest month is October, with just 68mm. That's 456mm 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
Sinnamary is mildly breezy, with an average annual wind speed of 14km/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 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/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 16km/h in winter, 15km/h in spring, 11km/h in summer, 13km/h in autumn.
Seasons
89 days until Summer
It is currently spring in Sinnamary, which began on March 20, 2026. Sinnamary 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 32°C, while the coldest stretch bottoms out in July near 24°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 24 to 29°C. Rainfall is heavy, totalling around 1040mm across the season with a monthly average of 347mm. Winds are moderate at around 15km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 24 to 31°C. Rainfall is heavy, totalling around 775mm across the season with a monthly average of 258mm. Winds are generally light, averaging 11km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 315mm across the season with a monthly average of 105mm. Winds are generally light, averaging 13km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 29°C. Rainfall is heavy, totalling around 746mm across the season with a monthly average of 249mm. Winds are moderate at around 16km/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 Sinnamary 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.
