Forecasters declare summer's conclusion within our nation's borders
As summer draws to a close, the upcoming autumn in many parts of the United States and Canada is predicted to be warmer than average, according to meteorologists. The end of summer will be signaled by a drop in temperatures, with daytime highs reaching 16 to 18°C in some areas, marking the start of the autumn season.
The recent heatwave has taken a toll on citizens, with many feeling weak and suffering from heat-related issues. To combat the extreme temperatures, experts advised adequate hydration and avoiding the peak midday heat. Thunderstorms also occurred during the heatwave, providing some relief but not enough to quell the intense heat.
Despite many people longing for summer, the heatwave demonstrated its dangerous side. However, as we move into autumn, the weather is expected to become more pleasant. The outdoor conditions will be warm and sunny, with temperatures reaching up to 27°C around mid-September, and it won't be too cold yet.
The ongoing ENSO-neutral conditions are predicted to transition into a weak La Niña phase, which will further influence global weather patterns, including the U.S. and parts of Canada. This La Niña influence supports slightly cooler equatorial Pacific sea surface temperatures, which will affect atmospheric circulation patterns.
In terms of temperature trends, the fall of 2025 across much of the U.S. and Canada is expected to be above normal, especially in the Southwest and New England. September may have near-normal or typical fall weather in many areas, but October and November are projected to be significantly warmer, which will pull the seasonal average above normal.
Regional variability will still occur, with Phoenix seeing a decrease in average highs from about 104°F at the start of fall to 70°F late fall, and New York City from 76°F to 54°F, reflecting normal seasonal cooling albeit from a warmer baseline than usual.
In summary, the transition from summer to autumn after a heatwave is likely to bring a gradual moderation in temperature in September, followed by warmer-than-average conditions in October and November, under the influence of emerging La Niña conditions and shifting high-pressure patterns. This forecast may vary for other countries depending on their geographic location and regional climate influences, but the ENSO-led shift is a key driver of global seasonal patterns in this period.
Storms, severe weather, and rain are not expected for most parts of the country in the coming days, ensuring a pleasant and sunny start to autumn. However, it's essential to remain vigilant and follow health and safety guidelines as temperatures continue to drop and the weather transitions.
