Live Weather & Forecast
Weather in União
Piauí, Brazil · Real-time conditions & 3-day outlook
25°C
Feels like 27°C
77°F / Feels 81°F
Partly cloudy
União, Piauí
🌞 Daytime
Updated: 2026-04-19 09:00
Humidity
89%
Wind
4.7 km/h E
Wind Gust
5.4 km/h
Pressure
1010 mb
Visibility
10 km
UV Index
5.8
(Moderate)
Precipitation
0.08 mm
Cloud Cover
75%
Dew Point
23.3°C
Wind Degree
89°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
108.9 μg/m³
NO₂
1.7 μg/m³
O₃
60 μg/m³
SO₂
1 μg/m³
PM 2.5
4 μg/m³
PM 10
4.1 μg/m³
Today's Hourly Forecast
24-hour breakdown for União, Piauí
12 AM
23°
Fog
1 AM
23°
Fog
2 AM
22°
Fog
3 AM
22°
Fog
4 AM
22°
Fog
5 AM
22°
Fog
6 AM
22°
Fog
7 AM
24°
Mist
8 AM
26°
Partly Cloudy
9 AM
25°
Partly cloudy
10 AM
30°
Patchy rain nearby
11 AM
30°
Patchy rain nearby
12 PM
31°
Light rain shower
1 PM
31°
Patchy rain nearby
2 PM
31°
Patchy rain nearby
3 PM
31°
Light rain shower
4 PM
30°
Patchy rain nearby
5 PM
27°
Patchy rain nearby
6 PM
24°
Patchy rain nearby
7 PM
23°
Patchy rain nearby
8 PM
23°
Mist
9 PM
23°
Mist
10 PM
23°
Mist
11 PM
23°
Fog
3-Day Forecast
Daily overview for União, Piauí
Today
Moderate rain
31°
/
22°
🌧️ 95% chance of rain
💧 Avg. humidity: 86%
💨 Max wind: 7.2 km/h
🌧️ Total precip: 5.58 mm
☀️ UV Index: 12.9
🌅 Sunrise: 05:51 AM
🌇 Sunset: 05:50 PM
🌙 Waxing Crescent
🌑 Moon: 3% lit
Mon, Apr 20
Moderate rain
31°
/
22°
🌧️ 86% chance of rain
💧 Avg. humidity: 91%
💨 Max wind: 6.1 km/h
🌧️ Total precip: 14.92 mm
☀️ UV Index: 9.3
🌅 Sunrise: 05:51 AM
🌇 Sunset: 05:50 PM
🌙 Waxing Crescent
🌑 Moon: 9% lit
Tue, Apr 21
Moderate rain
27°
/
22°
🌧️ 79% chance of rain
💧 Avg. humidity: 96%
💨 Max wind: 6.1 km/h
🌧️ Total precip: 11.91 mm
☀️ UV Index: 7.6
🌅 Sunrise: 05:51 AM
🌇 Sunset: 05:50 PM
🌙 Waxing Crescent
🌑 Moon: 17% lit
Best Time to Visit União
Plan your trip to União, Brazil around the most favorable weather conditions.
Peak Season
November – April
Dry season — low humidity, clear skies, comfortable temperatures.
Shoulder Season
May, October
Fewer crowds, moderate prices, mild weather.
Off Season
June – September
Wet/monsoon season; heavier rainfall possible.
Frequently Asked Questions
What is the current weather in União?
Current conditions in União: Partly cloudy, temperature 25°C, humidity 89%.
What is the best time to visit União?
The best time to visit União is typically November – April. Dry season — low humidity, clear skies, comfortable temperatures.
What is the climate like in União?
União is located at approximately -4.6° latitude. It has a tropical or subtropical climate with wet and dry seasons.
Does it rain a lot in União?
The wettest period in União is typically during June – September. Wet/monsoon season; heavier rainfall possible.
What should I pack for a trip to União?
For visits to União during November – April: light clothing and sun protection. For June – September: layers and a waterproof jacket are recommended.
What are the public holidays in União in 2026?
View the 2026 public holidays for União on our Holidays page.
What are the GPS coordinates used for the weather forecast in União?
The weather forecast for União uses coordinates -4.5893, -42.8593.