Autumnal Equinox Will Arrive on Tuesday Evening
The official start of fall coincides with cool temperatures and rain across the eastern United States.
Updated on Sept. 22, 2026 in Current Conditions
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The Autumnal Equinox will occur at 8:05 p.m. on Tuesday, September 23, 2026. This transition marks the official arrival of autumn for the country as persistent rain continues.
Why it matters
A Canadian high pressure system is currently creating a cool air damming effect throughout the eastern United States. This meteorological phenomenon has pushed temperatures below the normal highs usually found in the low 70s.
The Autumnal Equinox is set for 8:05 p.m. on Tuesday, while temperatures remain suppressed below the typical high of the low 70s. Persistent rain is forecast to continue through Wednesday night due to a Canadian high pressure system.
The details
The eastern United States is experiencing an air damming effect, which is trapping cooler air and moisture in the region. These conditions are expected to linger through the middle of the week before temperatures begin a slow rebound.
Timeline
September 22, 2026: Cooler temperatures began impacting the region on Monday.
September 23, 2026: The Autumnal Equinox occurs at 8:05 p.m.
September 23-24, 2026: Persistent rain is expected to continue through Wednesday night.
September 28-29, 2026: Temperatures are projected to rebound early next week.
Seasonal Patterns
This transition follows the established astronomical pattern identified by the National Weather Service's standard autumnal equinox astronomical timing. While the date is fixed, current conditions reflect a deviation from average high temperatures caused by transient pressure systems.
Residents across the eastern United States should prepare for persistent rain and unseasonably cool conditions through Wednesday. Ensure outdoor plans are adjusted for continued damp weather and check local forecasts for lingering effects of the air damming pattern.
The takeaway
The arrival of the fall season often coincides with shifts in regional pressure systems that dictate local comfort levels. Residents can look forward to more stable and warmer conditions returning to the eastern United States by early next week.
Further reading
For more information on ongoing meteorological trends, visit the Current Conditions page.
Source note: This article includes information reported by News-Talk 1480 WHBC.
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