Summer Will End With High Heat Before A Cold Front
The final full day of summer on September 21, 2026, will see temperatures climb to 93 degrees.
Updated on Sept. 21, 2026 in Forecasts
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As the season draws to a close on September 21, 2026, residents will experience a high of 93 degrees with a heat index reaching 103 degrees. Fall will officially begin on September 22, 2026, following the passage of a weak cold front.
Why it matters
A weak cold front is expected to move in from the northeast, effectively clearing out afternoon showers and thunderstorms. This transition marks the shift from summer conditions to the cooler air expected later in the week.
Meteorologists report a high of 93 degrees and a heat index of 103 degrees for September 21. Temperatures are projected to hit 94 degrees by September 23 before dropping into the upper 80s following the front.
The details
The approaching cold front from the northeast will shift weather patterns, bringing relief from current humidity and heat. Inland areas can expect morning temperatures in the 60s, while coastal regions anticipate temperatures near 70.
Timeline
September 21, 2026: The final full day of summer.
September 22, 2026: The official start of fall.
September 23, 2026: Forecasted high of 94 degrees.
Seasonal Patterns
This forecast follows the established transition of weather patterns typically observed during the autumnal equinox. The shift mirrors historical seasonal benchmarks where late-summer heat is periodically interrupted by northern cold fronts.
Residents should prepare for high heat index levels on September 21 by limiting outdoor exertion during peak afternoon hours. After the cold front passes, check local forecasts for updated temperature drops to adjust daily heating and clothing needs.
The takeaway
The final days of summer often bring volatile temperature swings as the atmosphere begins to transition into fall. Staying informed on cold front movements helps in planning for the rapid cooling expected in the coming week.
Further reading
For more updates on atmospheric conditions, visit the Forecasts section.
Source note: This article includes information reported by WXXV News 25.
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