Is Belém sunnier than Cayenne?

Belém is the sunnier: about 2,385 hours of sunshine a year versus 2,049 — a difference of 336 hours.

Which is warmer, Belém or Cayenne?

Belém is warmer across the year: average daytime highs of 30°C (86°F) versus 28°C.

Which is better in winter (November–February), Belém or Cayenne?

They are close in the November–February window: Belém averages 66/100 (about 30°C days), Cayenne 65/100 (about 28°C).

Which has the warmer sea, Belém or Cayenne?

Both peak at about 31°C (88°F); month-by-month sea temperatures for both are on this page.

Belém vs Cayenne: which is sunnier?

🇧🇷 Brazil vs 🇬🇫 French Guiana · 813 km apart · long-term climate normals (NASA POWER, 2001–2020)

Belém is the sunnier overall: about 2,385 hours of sunshine a year to Cayenne's 2,049. Cayenne has the higher Sunshine Score in 3 of 12 months, Belém in 2 (7 within 2 points).

Scores are the 0–100 Sunshine Score — sunshine, daytime warmth and dryness in one number, per month.

At a glance

	Belém	Cayenne
Sunshine hours / year	2,385	2,049
Sunniest month	August (76/100)	September (81/100)
Nov–Feb average score	66/100	65/100
Jun–Aug average score	71/100	66/100
Rain / year	2,568 mm	2,872 mm
Warmest sea	31°C / 88°F	31°C / 88°F
Peak midday UV	11 (extreme)	12 (extreme)

Belém vs Cayenne month by month

Month	Sunshine Score		Day high °C		Rain mm		Sea °C
Month	Belém	Cayenne	Belém	Cayenne	Belém	Cayenne	Belém	Cayenne
January	65	63	29°	27°	311	300	30°	29°
February	65	63	28°	27°	369	264	30°	29°
March	65	63	28°	28°	411	250	30°	30°
April	65	63	28°	28°	383	369	30°	30°
May	65	63	28°	28°	275	504	31°	29°
June	65	63	29°	28°	171	334	31°	30°
July	71	63	29°	28°	119	217	31°	30°
August	76	71	31°	28°	93	109	31°	31°
September	71	81	33°	29°	75	54	30°	31°
October	71	80	33°	30°	79	58	30°	31°
November	68	71	33°	29°	94	110	30°	30°
December	65	63	31°	28°	188	303	30°	29°

The sunnier month by month: Jan even · Feb even · Mar even · Apr even · May even · Jun even · Jul Belém · Aug Belém · Sep Cayenne · Oct Cayenne · Nov Cayenne · Dec even.

When to pick which

November–February: too close to call — Belém averages 66/100, Cayenne 65/100. Belém is the warmer, around 30°C daytime highs vs 28°C.
March–May: too close to call — Belém averages 65/100, Cayenne 63/100. Daytime highs are similar (28°C vs 28°C).
June–August: Belém (average score 71/100 vs 66). Belém is the warmer, around 30°C daytime highs vs 28°C.
September–October: Cayenne (average score 81/100 vs 71). Belém is the warmer, around 33°C daytime highs vs 30°C.

Sea temperature

Both seas peak at 31°C / 88°F. Swimmable water (21°C+): Belém all year, Cayenne all year. Month-by-month sea temperatures are in the table above.

Full month-by-month guides: Belém weather by month · Cayenne weather by month · Best time to visit Brazil.

More comparisons: Belém vs São Luís · Belém vs Macapá · Belém vs Marabá · Cayenne vs Macapá · Cayenne vs Georgetown · all head-to-heads