# Weather patterns and humidity alerts in Alagoas

> Live situation record from CLSTR: https://clstr.news/situations/weather-patterns-and-humidity-alerts-in-alagoas
> Updated: 2026-09-24T17:44:00.000Z. Sources: 60. Developments: 2.

Weather patterns in Alagoas transitioned from a period of brief instability and sunny conditions in mid-September to a period of low humidity by late September.

Initially, forecasts indicated a mix of passing showers in coastal and forest regions alongside sunny weather in the interior. By September 24, the National Institute of Meteorology (Inmet) issued a yellow alert for dozens of municipalities due to low air humidity levels expected to fluctuate between 20% and 30%. Authorities advised residents to stay hydrated and limit sun exposure to mitigate health risks.

As of late September, these low humidity levels in Alagoas continue to pose risks to respiratory health and have increased fire hazards in the region. This situation is part of a broader pattern of extreme weather across Brazil. In Amazonas, the state government has declared a state of emergency for all 62 municipalities due to drought and low river levels, which could impact up to 648,000 people. The region is also facing poor air quality caused by intense wildfires. Projections suggest these conditions may persist until early 2027 due to El Niño.

In the Northeast, while the Matopiba agricultural region is seeing a shift as rains arrive, Maranhão continues to struggle, with drought-affected areas expanding from 45% to 83% of the state in a single month. Additionally, Rio Grande do Norte faces a yellow alert for low humidity across 94 municipalities. Conversely, the South faces heavy rainfall exceeding 200 mm in Rio Grande do Sul, Santa Catarina, and Paraná. Meteorologists warn of a potential extratropical cyclone near Uruguay and Rio Grande do Sul that could trigger storms, flooding, and landslides, followed by a cold air mass.

## Claims

- The Matopiba agricultural region is receiving rain after a period of drought. (corroborated by 7 sources)
- Inmet reported rainfall across various Brazilian regions. (corroborated by 3 sources)
- The Amazonas government declared a state of emergency for all 62 municipalities in the state due to drought risks. (corroborated by 3 sources)
- Up to 648,000 people, or approximately 162,000 families, could be affected by the drought in Amazonas. (corroborated by 3 sources)
- Inmet issued a yellow alert for low humidity affecting 94 municipalities in Rio Grande do Norte. (corroborated by 3 sources)
- An extratropical cyclone is expected to form near Uruguay and Rio Grande do Sul, potentially bringing heavy rain to Southern Brazil. (corroborated by 3 sources)
- Manaus Civil Defense issued an alert for intense rain and potential flooding. (single source)
- Maranhao's drought-affected area increased from 45% to 83% in one month. (single source)

## Timeline

### 2026-09-24: Brazil weather: Amazonas declares emergency amid drought as South faces heavy rain

Brazil faces extreme weather shifts: Amazonas is in a state of emergency due to severe drought, while the South prepares for heavy rains and cyclones, and Matopiba receives relief from recent rainfall.

60 sources. https://clstr.news/cluster/alagoas-municipalities-placed-under-low-humidity-alert

### 2026-09-11: Alagoas weather forecast predicts sunny weekend

Alagoas will see a weather transition this weekend, moving toward sunny and dry conditions by Sunday, with temperatures reaching 33°C in the Sertão.

2 sources. https://clstr.news/cluster/alagoas-weather-forecast-predicts-sunny-weekend

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Cite as: Weather patterns and humidity alerts in Alagoas. CLSTR, https://clstr.news/situations/weather-patterns-and-humidity-alerts-in-alagoas