Grand-Santi Airport (GSI) 15 Day Weather Forecast, Grand-Santi French Guiana
Current weather conditions and 15 day weather forecast for Grand-Santi Airport in Grand-Santi, French Guiana including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain, wind speed, cloud, pressure, and UV index.
Current weather conditions at GSI
| 18 September 2026 Fri 24.8 ° C ( 76.7°F )  Overcast |
Feels Like : 27.1 ° C / 80.8°F Humidity : % 71 Pressure : 1014 mb Wind Speed : 5.4 kmph / 3.4 miles from NE 
Visibility : 10 km Precipitation (rainfall) : 0 mm Cloud (%) : 100 |
15-day weather forecast for Grand-Santi Airport, Grand-Santi, French Guiana
| Date | Weather forecast | Low temperature | High temperature | Average Temperature | Humidity | Wind | Chance of rain |
|---|---|---|---|---|---|---|---|
| 17 September 2026 Thu | Overcast |
23.3 ° C | 37.9 ° C | 28.4 ° C | % 60 | 9.4 km/h | 11% |
| 18 September 2026 Fri | Overcast |
20.8 ° C | 38.6 ° C | 29.1 ° C | % 55 | 10.1 km/h | 7% |
| 19 September 2026 Sat |  Sunny |
20.4 ° C | 39.2 ° C | 29.4 ° C | % 50 | 9.4 km/h | 3% |
| 20 September 2026 Sun | Sunny |
21.3 ° C | 38.8 ° C | 29.3 ° C | % 55 | 9.4 km/h | 4% |
| 21 September 2026 Mon | Sunny |
21.6 ° C | 38.4 ° C | 29.8 ° C | % 55 | 10.8 km/h | 3% |
| 22 September 2026 Tue | Sunny |
20.3 ° C | 38 ° C | 28.5 ° C | % 60 | 9.4 km/h | 5% |
| 23 September 2026 Wed |  Patchy rain nearby |
22.6 ° C | 37.5 ° C | 27.9 ° C | % 68 | 8.3 km/h | 58% |
| 24 September 2026 Thu | Patchy rain nearby |
21.9 ° C | 37.8 ° C | 27.5 ° C | % 75 | 8.6 km/h | 59% |
| 25 September 2026 Fri |  Fog |
22.5 ° C | 38.5 ° C | 27.9 ° C | % 72 | 9 km/h | 14% |
| 26 September 2026 Sat | Overcast |
21.7 ° C | 39 ° C | 29.3 ° C | % 64 | 9.4 km/h | 11% |
| 27 September 2026 Sun | Patchy rain nearby |
22 ° C | 38.7 ° C | 29.1 ° C | % 65 | 9 km/h | 13% |
| 28 September 2026 Mon | Overcast |
21.8 ° C | 35.6 ° C | 27.1 ° C | % 76 | 9 km/h | 28% |
| 29 September 2026 Tue | Fog |
22 ° C | 37.8 ° C | 27.3 ° C | % 75 | 10.1 km/h | 63% |
| 30 September 2026 Wed | Sunny |
22.4 ° C | 37.6 ° C | 28.5 ° C | % 68 | 11.2 km/h | 11% |
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