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
| 13 September 2026 Sun 37.4 ° C ( 99.3°F )  Overcast |
Feels Like : 36.8 ° C / 98.2°F Humidity : % 24 Pressure : 1009 mb Wind Speed : 8.6 kmph / 5.4 miles from E 
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 |
|---|---|---|---|---|---|---|---|
| 13 September 2026 Sun | Overcast |
20 ° C | 37.4 ° C | 27.9 ° C | % 58 | 11.5 km/h | 7% |
| 14 September 2026 Mon | Overcast |
21 ° C | 37.7 ° C | 28.2 ° C | % 63 | 9.7 km/h | 10% |
| 15 September 2026 Tue |  Sunny |
21.6 ° C | 35.6 ° C | 27.8 ° C | % 63 | 10.8 km/h | 9% |
| 16 September 2026 Wed | Sunny |
22.1 ° C | 38.9 ° C | 29.3 ° C | % 56 | 10.1 km/h | 5% |
| 17 September 2026 Thu | Sunny |
21.9 ° C | 39.1 ° C | 29.2 ° C | % 60 | 10.4 km/h | 10% |
| 18 September 2026 Fri |  Partly Cloudy |
22.2 ° C | 38.9 ° C | 29.5 ° C | % 59 | 9.7 km/h | 8% |
| 19 September 2026 Sat | Sunny |
21.2 ° C | 39.3 ° C | 29.6 ° C | % 57 | 9.4 km/h | 6% |
| 20 September 2026 Sun | Sunny |
21.1 ° C | 39.1 ° C | 29.3 ° C | % 57 | 9.4 km/h | 6% |
| 21 September 2026 Mon | Sunny |
21.4 ° C | 38.5 ° C | 29.5 ° C | % 58 | 10.1 km/h | 3% |
| 22 September 2026 Tue | Sunny |
20.2 ° C | 38.9 ° C | 29 ° C | % 58 | 9 km/h | 4% |
| 23 September 2026 Wed | Sunny |
21.5 ° C | 36.2 ° C | 27.6 ° C | % 69 | 8.3 km/h | 9% |
| 24 September 2026 Thu |  Patchy rain nearby |
23.1 ° C | 39.6 ° C | 27.8 ° C | % 72 | 8.6 km/h | 36% |
| 25 September 2026 Fri |  Fog |
22.4 ° C | 38.5 ° C | 27.6 ° C | % 76 | 13 km/h | 79% |
| 26 September 2026 Sat | Overcast |
22.4 ° C | 38.4 ° C | 27 ° C | % 80 | 7.6 km/h | 81% |
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