5-day weather forecast Rio de Janeiro Sep 18, 2026
21°Weather forecast Rio de Janeiro Friday Sep 18, 2026: patchy rain possible, temperature from 18 °C to 21 °C.
Precipitation probability 52%. Wind up to 6.39 m/s (gusts 7.81 m/s). Air humidity 78–91%, atmospheric pressure 767–770 mm Hg, UV index up to 6.2.
5 days at a glance — tap a day to open it
Sunrise 05:46
Sunset 17:47
Sunset 17:47
First Quarter53% illuminated
Moonrise 10:58 · Moonset 00:18
Moonrise 10:58 · Moonset 00:18
Chart
Table
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Light rain shower | 18 °C | 52% (0.34 mm/hr) | 93% | 91% | 770 mm Hg | ENE 73° 4.39 (7.11) m/s | 0 |
| 01:00 |  Patchy rain possible | 18 °C | 41% (0.11 mm/hr) | 100% | 91% | 770 mm Hg | ENE 74° 4.39 (6.42) m/s | 0 |
| 02:00 | Patchy rain possible | 18 °C | 43% (0.14 mm/hr) | 100% | 91% | 769 mm Hg | ENE 67° 4.31 (6) m/s | 0 |
| 03:00 | Patchy rain possible | 18 °C | 40% (0.09 mm/hr) | 100% | 91% | 769 mm Hg | ENE 62° 3.89 (5.72) m/s | 0 |
| 04:00 | Patchy rain possible | 18 °C | 38% (0.08 mm/hr) | 100% | 91% | 768 mm Hg | ENE 62° 3.61 (5.61) m/s | 0 |
| 05:00 | Patchy rain possible | 18 °C | 35% (0.05 mm/hr) | 100% | 91% | 769 mm Hg | ENE 61° 3.81 (5.83) m/s | 0 |
| 06:00 | Patchy rain possible | 18 °C | 35% (0.05 mm/hr) | 98% | 91% | 770 mm Hg | ENE 61° 3.81 (5.81) m/s | 0 |
| 07:00 | Patchy rain possible | 18 °C | 35% (0.05 mm/hr) | 100% | 90% | 770 mm Hg | ENE 67° 4 (5.83) m/s | 0.2 |
| 08:00 | Patchy rain possible | 19 °C | 34% (0.05 mm/hr) | 100% | 89% | 770 mm Hg | ENE 64° 4.39 (6.31) m/s | 1 |
| 09:00 | Patchy rain possible | 19 °C | 32% (0.04 mm/hr) | 99% | 88% | 770 mm Hg | ENE 67° 4.69 (6.5) m/s | 2 |
| 10:00 | Patchy rain possible | 20 °C | 30% (0.04 mm/hr) | 94% | 86% | 770 mm Hg | ENE 78° 5.31 (6.61) m/s | 4 |
| 11:00 | Patchy rain possible | 20 °C | 26% (0.03 mm/hr) | 88% | 84% | 770 mm Hg | E 79° 6.19 (7.42) m/s | 5.8 |
| 12:00 | Patchy rain possible | 20 °C | 20% (0.01 mm/hr) | 70% | 83% | 769 mm Hg | E 81° 6.39 (7.81) m/s | 5.9 |
| 13:00 | Patchy rain possible | 21 °C | 17% (0.01 mm/hr) | 65% | 79% | 768 mm Hg | E 83° 6.11 (7.11) m/s | 6.2 |
| 14:00 |  Cloudy | 21 °C | 17% | 72% | 78% | 767 mm Hg | E 86° 6.11 (6.92) m/s | 4.4 |
| 15:00 |  Partly cloudy | 21 °C | 15% | 61% | 79% | 767 mm Hg | E 86° 6 (6.64) m/s | 2.3 |
| 16:00 | Partly cloudy | 20 °C | 15% | 55% | 80% | 767 mm Hg | E 88° 5.89 (6.94) m/s | 1 |
| 17:00 | Cloudy | 20 °C | 20% | 81% | 81% | 767 mm Hg | E 86° 6.11 (7.31) m/s | 0.3 |
| 18:00 |  Overcast | 20 °C | 23% | 94% | 82% | 767 mm Hg | E 79° 6.11 (7.39) m/s | 0 |
| 19:00 |  Cloudy | 20 °C | 20% | 75% | 83% | 767 mm Hg | ENE 73° 6.11 (7.61) m/s | 0 |
| 20:00 | Cloudy | 20 °C | 21% | 80% | 83% | 768 mm Hg | ENE 76° 5.39 (7.11) m/s | 0 |
| 21:00 | Cloudy | 19 °C | 23% | 87% | 84% | 768 mm Hg | ENE 74° 5.5 (7.39) m/s | 0 |
| 22:00 | Cloudy | 19 °C | 22% | 82% | 84% | 768 mm Hg | ENE 70° 5.61 (7.53) m/s | 0 |
| 23:00 | Overcast | 19 °C | 26% | 100% | 84% | 768 mm Hg | ENE 64° 5.5 (7.72) m/s | 0 |
Rio de Janeiro on the map
Data Sources & Methodology
Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.