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September Marks Dramatic Daylight Decline Across U.S.

8/31/2025

36 8 Full Breakdown

Summary

Story summary

Daylight hours will significantly shorten in September, culminating in the autumn equinox on September 22.
Northern U.S. regions will see a decrease of approximately 100 minutes of daylight, while Alaska will lose 193 minutes.
Cleveland's last 8 p.m. sunset occurs on August 31, indicating earlier evenings ahead.
By September's end, many U.S. cities will lose over an hour of daylight, contributing to cooler temperatures.

History

Historical Context

The autumn equinox on September 22, 2023, signifies a shift in daylight, marking the transition to shorter days. This change is rooted in the 1970 Uniform Time Act, which standardized daylight saving time in the U.S. As daylight wanes, cities like Cleveland experienced their last 8 p.m. sunset on August 31, reflecting the ongoing impact of natural cycles on energy use and agriculture.

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Story summary

Daylight hours will significantly shorten in September, culminating in the autumn equinox on September 22.
Northern U.S. regions will see a decrease of approximately 100 minutes of daylight, while Alaska will lose 193 minutes.
Cleveland's last 8 p.m. sunset occurs on August 31, indicating earlier evenings ahead.
By September's end, many U.S. cities will lose over an hour of daylight, contributing to cooler temperatures.

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