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 perfect 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.

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For a detailed overview over the year and the best time to visit Brazil, check out our Niterói's climate page.

Niterói Temperature in September

Min Temperature 19°C (66°F)  

Max Temperature 28°C (82°F)  

Water Temperature 21°C (70°F) *  

Chance of Rain 38%  

Precipitation 85 mm (3.3 in)  

Rainy days 12 days  

Humidity 79% *  

Windspeed 3 m/s (6 knots) *  

Sunshine 144 hours *  

Percentage Sunshine *  

* Data from: Rio de Janeiro, Brazil (8 KM, 5 Miles).

What to Wear in Niterói in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With water temperatures around 21°C (70°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Niterói in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Brazil, check out our Niterói's climate page.

More climate data for Niterói

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Niterói climate overview or explore weather in Brazil.