Severe drought has spread
352 municipalities in severe drought or worse, against 122 the month before.
ANA · Drought Monitor
Drought · official map for September 2026
352 municipalities are in severe drought or worse. That's 230 more than the month before. Acre has the largest share of its municipalities in drought.
The five categories
The Drought Monitor ranks drought in five levels, based on rainfall, soil moisture and vegetation indices, checked every month by specialists in each state.
What matters now
352 municipalities in severe drought or worse, against 122 the month before.
ANA · Drought Monitor
The forecast for the next 7 days adds up to 12 mm.
Open-Meteo · ERA5
141 mm over the last 90 days, when normal would be 419 mm.
Open-Meteo · ERA5
Where the drought is
Share of each state's monitored municipalities in drought on the official map. For cities, days without rain and recent rainfall compared with normal.
| City | Days without rain | Rain, 90 days | vs. normal | Next 7 days | Monitor |
|---|---|---|---|---|---|
| TeresinaPI | 90 | 8 mm | calculating | 12 mm | S0 |
| MacapáAP | 21 | 118 mm | calculating | 2 mm | S0 |
| PetrolinaPE | 8 | 6 mm | calculating | 5 mm | S2 |
| Boa VistaRR | 6 | 200 mm | calculating | 8 mm | S2 |
| Juazeiro do NorteCE | 4 | 20 mm | calculating | 14 mm | S0 |
| CaucaiaCE | 4 | 46 mm | calculating | 2 mm | no drought |
| FortalezaCE | 4 | 69 mm | – | 2 mm | no drought |
| Feira de SantanaBA | 3 | 64 mm | calculating | 13 mm | S1 |
| CaruaruPE | 3 | 87 mm | calculating | 3 mm | S2 |
| CamaçariBA | 3 | 106 mm | calculating | 26 mm | S0 |
| Campina GrandePB | 3 | 114 mm | calculating | 3 mm | S1 |
| SalvadorBA | 3 | 138 mm | -40% | 25 mm | S0 |
Reservoirs
Energy stored in reservoirs, as % of the maximum. When it falls, thermal plants kick in and electricity bills go up.
the lowest for this day was 17.8%, in 2021
Largest reservoirs
| Reservoir | Now | 30 days | 1 year |
|---|---|---|---|
| Serra da MesaSE | 40.8% | -5.5 | -14.3 |
| FurnasSE | 61.7% | +0.7 | +27.4 |
| SobradinhoNE | 61.2% | -4.4 | +18.1 |
| Nova PonteSE | 43.7% | -1.7 | +2.5 |
| EmborcaçãoSE | 52.1% | -1.8 | +3.2 |
| ItumbiaraSE | 62.4% | -5.9 | +20.6 |
| TucuruiN | 55.6% | -10.1 | -6 |
| S.do FacãoSE | 46.5% | -4.1 | -3.6 |
| G. B. MunhozS | 86.2% | +1.1 | -12.2 |
| MarimbondoSE | 48.2% | -4 | +21.1 |
ONS data up to 10/26/2026.
Drought, fire and rain
We cross the drought map with fire hotspots, the rain forecast and air quality.
2%of hotspots
in the last 24 h are in municipalities in severe drought or worse.
Go to Wildfires →18cities
of the 100 tracked are expected to get less than 10 mm over the next 7 days.
See the forecast on the Radar →1cities with poor air
Dry weather and smoke worsen the air. Santarém is in the poor range or worse right now.
Go to Air quality →Historical series · Drought Monitor since 2014
Share of monitored municipalities in each category, month by month. Until 2018 the Monitor covered only the Northeast; all of Brazil since 2021.
Drought Monitor: maps from July 2014 to September 2026. Rainfall: ERA5 reanalysis (Open-Meteo), which estimates rain on a ~25 km grid.
How it works
We show official data as it arrives, with the source and date on each block. This site does not issue official warnings.
Drought map: ANA's Drought Monitor, published every month since July 2014. We keep each municipality's category for every month and the map shapes for the last 12.
Rainfall: ERA5 reanalysis via Open-Meteo for the 100 tracked cities. Yesterday's rain comes in daily; the normal is the 1991–2020 average from the same source.
Reservoirs: ONS open data, with stored energy per subsystem since 2000 and per reservoir over the last 13 months.
Fire and air: the same data as the Wildfires and Air quality sections.
Specialists in each state combine rainfall, soil moisture, vegetation and river-flow indices with field reports, and draw the areas in five categories, from S0 (mild) to S4 (exceptional).
Each municipality takes the most severe category of the area covering its center. Percentages are over the municipalities inside the monitored area that month.
Days without rain: consecutive days with less than 1 mm up to yesterday. We keep 95 days of daily rain, so longer streaks show as "more than".
Rain against normal: total for the last 30 or 90 days divided by the normal for the same days. When the normal is very low (dry season), the percentage is misleading and isn't shown.
The 1991–2020 normal is calculated gradually: 12 of 100 cities ready.
Notices follow fixed rules: municipalities in extreme or exceptional drought, severe drought changing 10% or more in a month, a city with 60 or more days without rain, 90-day rainfall 50% or more below normal, and a subsystem's reservoirs below 30%. No text is written by artificial intelligence.
The official map is monthly and comes out about 45 days after the start of the month it describes. Daily rainfall helps show what has changed since.
The reanalysis estimates rainfall on a grid of about 25 km. It can miss very localized storms and doesn't replace a rain gauge.
The monitored area grew from 2014 to 2021. Before that, a state outside the area doesn't show as "no drought": it shows as not monitored.
ONS reservoirs are hydropower reservoirs. City water supply depends on other sources, which are not shown here.
In a drought emergency, Civil Defense organizes water trucks and guidance. Save water and follow your water utility's notices.