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Weather in Rio de Janeiro for September 2025

Your guide to Rio de Janeiro weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Rio de Janeiro is cooler than usual, with temperatures averaging 23.8 °C, this is -3.1 °C below the typical seasonal average.

  • The forecast for the next days in Rio de Janeiro predicts temperatures to be around 26 °C, close to the historical average.

  • In general, the average temperature in Rio de Janeiro at the beginning of September is 25.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.1 °C by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Rio de Janeiro experiences minimal rainfall in September.

Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/20°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
69 %
Avg humidity

Rio de Janeiro Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Partly cloudy
26°
2
Patchy rain possible
26°
3
Sunny
26°
4
Sunny
28°
5
Light drizzle
28°
6
Patchy rain possible
23°
7
Patchy rain possible
24°
8
Sunny
27°
9
Sunny
29°
10
Sunny
26°
11
Sunny
28°
12
Sunny
28°
13
Sunny
28°
14
Overcast
29°
15
Overcast
24°
16
Patchy rain possible
29°
17
Patchy rain possible
26°
18
Patchy rain possible
26°
19
Sunny
30°
20
Patchy rain possible
30°
21
Sunny
36°
22
Patchy rain possible
39°
23
Patchy rain possible
21°
24
Moderate rain
18°
25
Patchy rain possible
18°
26
Patchy rain possible
20°
27
Partly cloudy
22°
28
Sunny
24°
29
Sunny
26°
30
Patchy rain possible
27°

Temperatures trend during September in Rio de Janeiro

See the weather trend as well as the moving average line

September weather in Rio de Janeiro day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 26° /18° 0.1 mm 7
2 Sept. Patchy rain possible
Patchy rain possible
 26° /19° 0.2 mm 7
3 Sept. Sunny
Sunny
 26° /19° 0 mm 8
4 Sept. Sunny
Sunny
 28° /19° 0 mm 8
5 Sept. Light drizzle
Light drizzle
 28° /19° 0.4 mm 7
6 Sept. Patchy rain possible
Patchy rain possible
 23° /19° 3.1 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 24° /19° 1.8 mm 6
8 Sept. Sunny
Sunny
 27° /19° 0 mm 7
9 Sept. Sunny
Sunny
 29° /19° 0 mm 8
10 Sept. Sunny
Sunny
 26° /19° 0.2 mm 7
11 Sept. Sunny
Sunny
 28° /19° 0 mm 8
12 Sept. Sunny
Sunny
 28° /20° 0.2 mm 7
13 Sept. Sunny
Sunny
 28° /20° 0.2 mm 7
14 Sept. Overcast
Overcast
 29° /20° 0 mm 7
15 Sept. Overcast
Overcast
 24° /18° 1.3 mm 6
16 Sept. Patchy rain possible
Patchy rain possible
 29° /19° 1.5 mm 2.1
17 Sept. Patchy rain possible
Patchy rain possible
 26° /20° 0.6 mm 2
18 Sept. Patchy rain possible
Patchy rain possible
 26° /20° 0.3 mm 2
19 Sept. Sunny
Sunny
 30° /20° 0 mm 2.2
20 Sept. Patchy rain possible
Patchy rain possible
 30° /22° 0.1 mm 0.6
21 Sept. Sunny
Sunny
 36° /24° 0 mm 8
22 Sept. Patchy rain possible
Patchy rain possible
 39° /21° 0.7 mm 8
23 Sept. Patchy rain possible
Patchy rain possible
 21° /19° 4.6 mm 5
24 Sept. Moderate rain
Moderate rain
 18° /17° 5.4 mm 5
25 Sept. Patchy rain possible
Patchy rain possible
 18° /16° 3.8 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
 20° /16° 0.7 mm 5
27 Sept. Partly cloudy
Partly cloudy
 22° /16° 0.1 mm 6
28 Sept. Sunny
Sunny
 24° /16° 0 mm 6
29 Sept. Sunny
Sunny
 26° /17° 0 mm 7
30 Sept. Patchy rain possible
Patchy rain possible
 27° /18° 0 mm 7
Next
Important Notice
Our weather forecast for Rio de Janeiro in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Rio de Janeiro forecast closer to your planned date for the most up-to-date weather information.
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Rio de Janeiro in September - FAQ

What are the expected maximum and minimum temperatures in Rio de Janeiro during September?
During September, expect a variety of temperatures with highs around 28° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in Rio de Janeiro during September?
Expect minimal rainfall in Rio de Janeiro during September, with a total of 15.4 mm over approximately 5 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Rio de Janeiro during September?
The average wind speed in Rio de Janeiro during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

Rio de Janeiro water temperatures in September

The average water temperature of the Atlantic Ocean near Rio de Janeiro in September is 19 °C. Temperatures remain fairly consistent throughout the month.

What is the water temperature in Rio de Janeiro in September?
The average water temperature in Rio de Janeiro in September is 19 °C.
Can you swim in Rio de Janeiro in September?
Refreshing and invigorating. Expect to feel chilled after 10–20 minutes; a shorty wetsuit extends water time, especially at dawn.

September rainfall patterns in Rio de Janeiro

Explore the daily rainfall trends and prepare for Rio de Janeiros September weather 💧

UV exposure in Rio de Janeiro during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Rio de Janeiro?

Get accurate weather forecasts for Rio de Janeiro, located at latitude -22.906 and longitude -43.182. Stay updated with localized weather information tailored for Rio de Janeiro.

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