Grand-Santi is warm all year: afternoons reach 31 to 34 degrees in every month
Rain adds up to roughly 2,416 mm over twelve months. Its July, January and rain figures all sit close to those of typical mainland French towns. Of all months, May brings the most rain and September the least.
These are the figures of Météo-France’s Maripasoula station, 81 km south-east; at that distance they describe the area more than the town.
A year in Grand-Santi at a glance
Each month’s typical high and low in °C, at the Maripasoula station.
What a year in Grand-Santi feels like
Typical highs and lows in the rainier and the drier half of the year, and by month, from Météo-France’s 1991–2020 normals at Maripasoula.
About 2,416 mm of rain a year
May is the wettest month and September the driest. About 82 days a year bring 10 mm or more. 13th wettest of 15 towns of 2,500+ in French Guiana.
Rain by month
Millimeters
The Météo-France station at Maripasoula
Maripasoula is 81 km south-east of Grand-Santi. Every figure on this page is the station’s, not a measurement in Grand-Santi itself. At that distance, read them as the area’s climate.
| Station (Météo-France number) | Maripasoula (97353001) |
| Distance from the town | 81 km south-east |
| Station altitude | 106 m |
| Town altitude (its center) | 48 m |
| Period | 1991–2020 |
TownRatings matches each commune to one station with at least 24 years of temperature and rain records: the nearest, counting every 100 m of height difference as 10 km, never across the sea.
How Grand-Santi compares
Against the 15 towns of 2,500+ in French Guiana (the dots). Mainland France’s towns aren’t a fair comparison for a tropical climate.
Grand-Santi weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Maripasoula station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 31.1°C | 22.5°C | 26.8°C | 223 mm |
| February | 31.1°C | 22.5°C | 26.8°C | 235 mm |
| March | 31.6°C | 22.7°C | 27.1°C | 239 mm |
| April | 31.7°C | 23.0°C | 27.4°C | 285 mm |
| May | 31.7°C | 23.2°C | 27.4°C | 354 mm |
| June | 31.9°C | 22.8°C | 27.3°C | 281 mm |
| July | 32.2°C | 22.3°C | 27.3°C | 205 mm |
| August | 33.0°C | 22.2°C | 27.6°C | 160 mm |
| September | 33.9°C | 22.0°C | 27.9°C | 58 mm |
| October | 34.3°C | 22.2°C | 28.2°C | 70 mm |
| November | 33.7°C | 22.5°C | 28.1°C | 112 mm |
| December | 32.2°C | 22.7°C | 27.4°C | 195 mm |
| Year | 32.4°C | 22.6°C | 27.4°C | 2,416 mm |
Where Grand-Santi’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Maripasoula, 81 km away: statistics for 1991–2020.
- Which station: among stations with at least 24 of the 30 years of temperature and rain, the nearest to the commune’s population-weighted center, counting each 100 m of height difference as 10 km; mainland towns use mainland stations and each overseas département its own.
- Altitudes: the town’s from IGN’s RGE ALTI® at its population-weighted center; the station’s from Météo-France.
- Comparisons: the towns of 2,500+ in French Guiana, read the same way.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Grand-Santi’s climate
How warm does Grand-Santi get in summer?
October is the warmest month, with average highs of 34.3°C. Météo-France publishes no count of hot days for this station.
Does Grand-Santi ever get cool?
Not much: the coolest nights, in September, average 22.0°C.
How much rain does Grand-Santi get?
About 2,416 mm a year. May is the wettest month (354 mm) and September the driest (58 mm).
Are these figures for Grand-Santi itself?
No: they are the normals of the Météo-France station matched to Grand-Santi, Maripasoula, 81 km away. France publishes its climate normals by station, not by commune; a valley, a hill or the sea can make a difference over a few kilometers.
Where do these figures come from?
Météo-France’s fiches climatologiques: 30-year averages (1991–2020) for each of its long-running stations, published as open data since 2024. They are normals, not a forecast.
Source: Météo-France, fiches climatologiques, 1991–2020 statistics (station MARIPASOULA, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Grand-Santi →
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.