Niterói Weather in September

September in Niterói sees daytime temperatures around 28°C (82°F) and lows of 19°C (66°F) at night. With around 85 mm (3.3 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Niterói in September

Climate statistics over the past 30 years suggest around 12 days of rain, with 85 mm (3.3 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Niterói in September

September tends to be one of the excellent months in Niterói, with 28°C (82°F) in the afternoon and 19°C (66°F) overnight. Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 19°C (66°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Niterói in September

You can expect a moderate amount of sunlight, with approximately 144 hours. This means a pleasant mix of sun and overcast.

Wind Speed in Niterói in September

Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.

Average water temperature in September

With water at 21°C (70°F), conditions are good for swimming and other water activities. You won't need a wetsuit and most people find it very comfortable.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.