September 2025 - Page 5 of 8 - Climate Impact Company

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09/09/2025, 12:22 pm EDT

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09/09/2025, 12:22 pm EDT

U.S. Meteorological Summer and August (2025) State Climate Rankings

August 2025 brought a cool surprise to the East U.S. including the 7th coolest in the 131-year record for South Carolina. Meanwhile the West, Southwest, and far South U.S. were MUCH ABOVE normal during August 2025. The dryness in the Missouri Valley to New England was profound featuring record dry for Kentucky, Ohio, and Vermont. Georgia was excessive wet during August. The Arizona heat observed in August was the second hottest on record.

09/09/2025, 5:02 am EDT

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09/09/2025, 5:02 am EDT

Subsurface East Equatorial Pacific Ha Notably Cooled Fueling La Nina Risk

Signaling additional cooling ahead in the Nino SSTA regions is the cool-off of the subsurface equatorial East Pacific. The subsurface cooling has accelerated during September. La Nina evolution will continue into Q4/2025.

09/09/2025, 4:57 am EDT

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09/09/2025, 4:57 am EDT

Long Duration Dryness Ohio Valley to Southeast U.S. Closes Calendar Summer

Late calendar summer dryness is excessive across the East/South U.S. as GFS indicates 360 consecutive hours of no rain from Central Texas to Western Pennsylvania and into the Southeast U.S. Consequently, drought development during late meteorological summer in the Ohio Valley is likely to expand southward.

09/08/2025, 5:48 am EDT

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09/08/2025, 5:48 am EDT

Extended-range Brazil Wet Weather Risk Easing Back

Extended-range forecasts offered beneficial rainfall to the Brazil drought area dating back to September 1st. How are these forecasts tracking? Generally, the wet risk remains although less impactful on the core of the drought area in East-central Brazil. ECM ENS has developing nearby rains during the medium range but leaves East Brazil dry in the latest 15-day forecast. GFS is trending somewhat drier. In the 16-30-day period, ECM is considerably less aggressive forecast wet weather in Brazil biasing the wet anomaly farther to the north.