Climate monitoring bulletin for the major river basins

The Amazon Basin

Volume 04 - Number 26

Publication date: July 1, 2026

Periodicity: Weekly

ISSN 2965-7857 • DOI 10.61818/78570426

Precipitation anomaly in the Amazon Basin
Legends

Current conditions

Maps of observed precipitation conditions, individual graphics by basin are produced from MERGE/GPM data generated by INPE/CPTEC, considering the period from de 1998 a 2025. Between June 2 to July 1, 2026, rainfall above the climatological average was recorded in the watersheds of the Abacaxis, Aripuanã, Coari, Curuá Una, Guaporé, Juruá, Juruena, Madeira, Mamoré, and Marañon rivers—the left-bank watersheds of the Amazon River in the northeast of the state of Amazonas and the northwest of the state of Pará—as well as in the Purus, Teles Pires, and Ucayali watersheds; rainfall below climatological norms resulted in a precipitation deficit along the main course of the Amazon River in Brazilian and Peruvian territories, as well as in the watersheds of the Branco, Içá, and Javari rivers; the left-bank watersheds of the Amazon River in northeastern Pará State; and the Napo River; Rainfall close to normal levels was recorded in the river basins of the Beni, Iriri, Japurá, Ji-Paraná, Jutaí, Negro, Tapajós, Tefé, and Xingu rivers, as well as along the main course of the Solimões River. The multi-model indicates, for the period from July 1 to July 7, 2026, forecast of predominantly positive precipitation anomalies concentrated in the northwest of the monitored area, over the main course of the Amazon River in Brazilian and Peruvian territory, and the watersheds of the Branco, Coari, Içá, Japurá, Javari, Jutaí, Marañon, Napo, Negro, Tefé, and Ucayali rivers. Precipitation deficit is forecast over the main course of the Amazon River in Brazilian territory, the river basins of the Beni, Curuá Una, Guaporé, Iriri, and Mamoré rivers, and the basins on the left bank of the Amazon River in the northeast of the state of Pará, as well as the Tapajós and Xingu basins. Precipitation near climatological norms is forecast for the remaining river basins.

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