Current Conditions

União, Piauí

77°F25°C

Hot

Wind

N 6 mph9 km/h

Humidity

86%

Cloud Cover

74%

As of Wednesday, September 23, 2026 at 5:45 AM GMT-3

Today's Outlook

Day

Mostly cloudy and hot, with a high of 97°F36°C and morning low of 77°F25°C. Light wind from the NNE around 3 mph5 km/h. Heat risk in the afternoon.

Night

Partly cloudy, with a low around 78°F25°C. Breezy from the NNW at 6 to 7 mph9 to 11 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Hot	High 97°F36°CFeels 101°F38°C	Low 77°F25°C	Precip 0 in0.1 mm2%	Cloud 55%	Wind N 4 mph7 km/h	Wednesday: Mostly cloudy and hot, with a high of 97°F36°C and morning low of 77°F25°C. Light wind from the NNE around 3 mph5 km/h. Heat risk in the afternoon. Wednesday Night: Partly cloudy, with a low around 78°F25°C. Breezy from the NNW at 6 to 7 mph9 to 11 km/h.
Hot	High 98°F37°CFeels 101°F38°C	Low 77°F25°C	Precip 0 in0 mm—	Cloud 39%	Wind NNE 6 mph10 km/h	Thursday: Partly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Breezy from the NE at 5 to 8 mph8 to 13 km/h. Heat risk in the afternoon. Thursday Night: Partly cloudy, with a low around 78°F25°C. Breezy from the N at 7 to 9 mph12 to 14 km/h.
Hot	High 97°F36°CFeels 100°F38°C	Low 77°F25°C	Precip 0.01 in0.2 mm5%	Cloud 43%	Wind NE 6 mph10 km/h	Friday: Partly cloudy and hot, with a high of 97°F36°C and morning low of 77°F25°C. Breezy from the ENE at 5 to 8 mph9 to 12 km/h. Heat risk in the afternoon. Friday Night: Partly cloudy, with a low around 78°F26°C. Breezy from the N at 7 to 10 mph11 to 16 km/h.
Hot	High 98°F37°CFeels 101°F38°C	Low 77°F25°C	Precip 0 in0.1 mm3%	Cloud 44%	Wind NE 5 mph8 km/h	Saturday: Partly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Breezy from the E at 5 to 7 mph8 to 11 km/h. Heat risk in the afternoon. Saturday Night: Partly cloudy, with a low around 78°F25°C. Breezy from the N at 5 to 7 mph8 to 12 km/h.
Hot	High 98°F37°CFeels 101°F38°C	Low 77°F25°C	Precip 0 in0.1 mm3%	Cloud 40%	Wind NE 5 mph8 km/h	Sunday: Partly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Light wind from the E around 5 mph8 km/h. Heat risk in the afternoon. Sunday Night: Partly cloudy, with a low around 78°F26°C. Breezy from the N at 5 to 8 mph9 to 13 km/h.
Hot	High 97°F36°CFeels 100°F38°C	Low 78°F25°C	Precip 0.01 in0.2 mm8%	Cloud 37%	Wind NE 5 mph9 km/h	Monday: Partly cloudy and hot, with a high of 97°F36°C and morning low of 78°F25°C. Light wind from the E around 5 mph8 km/h. Heat risk in the afternoon. Monday Night: Partly cloudy, with a low around 79°F26°C. Breezy from the N at 6 to 9 mph9 to 14 km/h.
Hot	High 98°F37°C	Low 77°F25°C	Precip 0 in0.1 mm3%	Cloud 27%	Wind NE 5 mph8 km/h	Tuesday: Partly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Light wind from the E around 5 mph8 km/h. Heat risk in the afternoon. Tuesday Night: Partly cloudy, with a low around 78°F25°C. Breezy from the N at 5 to 8 mph8 to 13 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 23	97°F36°C Feels 101°F38°C	77°F25°C	0 in0.1 mm· 2%	55%	Hot	N 4 mph7 km/h
DayMostly cloudy and hot, with a high of 97°F36°C and morning low of 77°F25°C. Light wind from the NNE around 3 mph5 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F25°C. Breezy from the NNW at 6 to 7 mph9 to 11 km/h.
	ThursdaySep 24	98°F37°C Feels 101°F38°C	77°F25°C	0 in0 mm· —	39%	Hot	NNE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Breezy from the NE at 5 to 8 mph8 to 13 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F25°C. Breezy from the N at 7 to 9 mph12 to 14 km/h.
	FridaySep 25	97°F36°C Feels 100°F38°C	77°F25°C	0.01 in0.2 mm· 5%	43%	Hot	NE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 97°F36°C and morning low of 77°F25°C. Breezy from the ENE at 5 to 8 mph9 to 12 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F26°C. Breezy from the N at 7 to 10 mph11 to 16 km/h.
	SaturdaySep 26	98°F37°C Feels 101°F38°C	77°F25°C	0 in0.1 mm· 3%	44%	Hot	NE 5 mph8 km/h
DayPartly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Breezy from the E at 5 to 7 mph8 to 11 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F25°C. Breezy from the N at 5 to 7 mph8 to 12 km/h.
	SundaySep 27	98°F37°C Feels 101°F38°C	77°F25°C	0 in0.1 mm· 3%	40%	Hot	NE 5 mph8 km/h
DayPartly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Light wind from the E around 5 mph8 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F26°C. Breezy from the N at 5 to 8 mph9 to 13 km/h.
	MondaySep 28	97°F36°C Feels 100°F38°C	78°F25°C	0.01 in0.2 mm· 8%	37%	Hot	NE 5 mph9 km/h
DayPartly cloudy and hot, with a high of 97°F36°C and morning low of 78°F25°C. Light wind from the E around 5 mph8 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 79°F26°C. Breezy from the N at 6 to 9 mph9 to 14 km/h.
	TuesdaySep 29	98°F37°C	77°F25°C	0 in0.1 mm· 3%	27%	Hot	NE 5 mph8 km/h
DayPartly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Light wind from the E around 5 mph8 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F25°C. Breezy from the N at 5 to 8 mph8 to 13 km/h.
	WednesdaySep 30	100°F38°C	77°F25°C	0 in0 mm· —	27%	Hot	NE 6 mph9 km/h
DayMostly clear and hot, with a high of 100°F38°C and morning low of 77°F25°C. Light wind from the E around 5 mph9 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F26°C. Breezy from the N at 6 to 8 mph9 to 12 km/h.
	ThursdayOct 1	100°F38°C	77°F25°C	0 in0 mm· —	23%	Hot	NE 6 mph10 km/h
DayMostly clear and hot, with a high of 100°F38°C and morning low of 77°F25°C. Breezy from the ENE at 6 to 7 mph9 to 11 km/h. Heat risk in the afternoon. NightMostly clear, with a low around 78°F26°C. Breezy from the N at 7 to 9 mph11 to 14 km/h.
	FridayOct 2	98°F37°C	77°F25°C	0 in0 mm· —	28%	Hot	NNE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Breezy from the ENE at 5 to 7 mph9 to 11 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F26°C. Breezy from the N at 7 to 9 mph11 to 14 km/h.
	SaturdayOct 3	98°F37°C	77°F25°C	0 in0 mm· —	44%	Hot	NE 6 mph10 km/h
DayPartly cloudy and hot, with a high of 98°F37°C and morning low of 77°F25°C. Breezy from the E at 6 to 7 mph10 to 12 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F25°C. Breezy from the NNE at 6 to 9 mph10 to 14 km/h.
	SundayOct 4	99°F37°C	77°F25°C	0 in0.1 mm· 6%	49%	Hot	ENE 6 mph10 km/h
DayMostly cloudy and hot, with a high of 99°F37°C and morning low of 77°F25°C. Breezy from the E at 7 to 8 mph11 to 13 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F26°C. Breezy from the NNE at 6 to 8 mph9 to 13 km/h.
	MondayOct 5	99°F37°C	77°F25°C	0 in0 mm· —	33%	Hot	ENE 6 mph9 km/h
DayPartly cloudy and hot, with a high of 99°F37°C and morning low of 77°F25°C. Breezy from the E at 6 to 8 mph10 to 13 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F25°C. Breezy from the NNE at 5 to 7 mph9 to 12 km/h.
	TuesdayOct 6	100°F38°C	76°F25°C	0 in0 mm· —	24%	Hot	ENE 6 mph9 km/h
DayMostly clear and hot, with a high of 100°F38°C and morning low of 76°F25°C. Breezy from the E at 6 to 8 mph10 to 12 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 77°F25°C. Breezy from the NNE at 5 to 8 mph9 to 12 km/h.
	WednesdayOct 7	100°F38°C	77°F25°C	0 in0 mm· —	23%	Hot	ENE 6 mph10 km/h
DayMostly clear and hot, with a high of 100°F38°C and morning low of 77°F25°C. Breezy from the E at 7 to 8 mph11 to 13 km/h. Heat risk in the afternoon. NightPartly cloudy, with a low around 78°F26°C. Breezy from the NNE at 6 to 8 mph10 to 13 km/h.

Nearby Cities

José de Freitas23 mi37 km Coelho Neto25 mi40 km Miguel Alves29 mi47 km Teresina35 mi56 km Timon35 mi57 km Caxias39 mi62 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 4.5858°S, 42.8642°W·Elevation: 60m·Timezone: America/Fortaleza·Population: 46,119