5 places · sun position · panel angle
Solar data for French Guiana
Across the 5 places in French Guiana the best fixed tilt for solar panels runs from 4° in Cayenne to 5° in Saint-Laurent-du-Maroni, and flat ground gets 5.1 to 5.2 peak sun hours a day. Every number is computed for each place.
Solar power in French Guiana at a glance
Averages over 5 places with climate data, for a fixed array facing south.
- 5.09–5.11
- 5.11–5.13
- 5.13–5.16
- 5.16–5.18
- 5.18–5.20
Peak sun hours a day on flat ground. Each dot is one place.
The sunniest place in French Guiana is Kourou (Guyane) with 5.20 peak sun hours a day on flat ground; the least sunny is Matoury with 5.09. A 1 kWp array at its best angle makes from 1,478 kWh a year in Matoury to 1,509 kWh in Kourou — 1,491 kWh on average.
The best year-round tilt runs from 4° in Cayenne to 5° in Saint-Laurent-du-Maroni. Off-grid systems are sized for the darkest month and do better steeper, at 0° on average: at 70° that month brings 0.97 kWh per kWp a day in Matoury and 0.98 kWh in Kourou.
Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.
Sunniest places in French Guiana
Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.
| Rank | Place | Region | Sun hours/day | kWh per kWp a year | Best tilt |
|---|---|---|---|---|---|
| 1 | Kourou | Guyane | 5.20 | 1,509 | 4° |
| 2 | Rémire-Montjoly | Guyane | 5.15 | 1,495 | 4° |
| 3 | Cayenne | Guyane | 5.14 | 1,491 | 4° |
| 4 | Saint-Laurent-du-Maroni | Guyane | 5.10 | 1,481 | 5° |
| 5 | Matoury | Guyane | 5.09 | 1,478 | 4° |
Largest places in French Guiana at a glance
| Place | Latitude | Best tilt | Off-grid tilt | Sun hours/day (flat) |
|---|---|---|---|---|
| Cayenne | 4.9° N | 4° | 0° | 5.14 |
| Matoury | 4.8° N | 4° | 0° | 5.09 |
| Saint-Laurent-du-Maroni | 5.5° N | 5° | 1° | 5.10 |
| Kourou | 5.2° N | 4° | 0° | 5.20 |
| Rémire-Montjoly | 4.9° N | 4° | 0° | 5.15 |
Daylight and clock time in French Guiana
In Saint-Laurent-du-Maroni (5.5° N), the northernmost place, the longest day of the year lasts 12 h 27 min and the shortest 11 h 48 min; in Matoury (4.8° N), the southernmost, 12 h 24 min and 11 h 51 min. French Guiana does not use daylight saving time: the clocks stay the same all year.
| Time zone | Places | UTC offset | Clocks change in 2026 |
|---|---|---|---|
| America/Cayenne | 5 | UTC−3 | no daylight saving time |