Last updated: August 23, 2025
In December, the average temperature in Grand-Santi, French Guiana is a warm 26°C (78°F), with a minimum of 20°C (68°F) and a maximum reaching up to 35°C (94°F). This month sees an average precipitation of 213 mm (8.4 in) spread over 27 days, contributing to a high humidity level of 79%. Enjoy the tropical climate, but be prepared for the occasional rain shower!
In December in Grand-Santi, the average temperature is 26°C (78°F). Maximum can reach 35°C (94°F) and minimum can be as low as 20°C (68°F). This pleasant weather makes it an ideal time for travelers to explore and enjoy outdoor activities.
In Grand-Santi in December, the precipitation amount is 213 mm (8.4 in) spread over 27 days.
In Grand-Santi in December, humidity is 79%. With an average temperature of 26°C (78°F), this humidity feels like a tropical blanket enveloping you, making outdoor activities less comfortable for traveling.
In Grand-Santi in December, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Grand-Santi.
UV Risk Categories
Weather in Grand-Santi varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Grand-Santi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 25°C (78°F) | 137 mm (5.4 inches) | 70% | extreme |
| February Weather | 25°C (78°F) | 105 mm (4.1 inches) | 66% | extreme |
| March Weather | 26°C (79°F) | 129 mm (5.1 inches) | 66% | extreme |
| April Weather | 26°C (78°F) | 290 mm (11.4 inches) | 66% | extreme |
| May Weather | 25°C (78°F) | 461 mm (18.2 inches) | 68% | extreme |
| June Weather | 26°C (78°F) | 317 mm (12.5 inches) | 86% | extreme |
| July Weather | 26°C (79°F) | 248 mm (9.8 inches) | 76% | extreme |
| August Weather | 27°C (80°F) | 115 mm (4.5 inches) | 65% | extreme |
| September Weather | 28°C (82°F) | 76 mm (3.0 inches) | 62% | extreme |
| October Weather | 28°C (83°F) | 38 mm (1.5 inches) | 63% | extreme |
| November Weather | 27°C (81°F) | 108 mm (4.3 inches) | 74% | extreme |
| December Weather | 26°C (78°F) | 213 mm (8.4 inches) | 79% | extreme |