Sunrise & Sunset Times in Sunnyvale — September 2026

Sunrise & Sunset in Sunnyvale During September

September contains the autumn equinox around the 22nd, when day and night are again nearly equal in Sunnyvale. Daylight is decreasing at its fastest rate — up to three or four minutes lost per day near the equinox. Many regions end daylight saving time late in the month or in October, which shifts sunset an hour earlier on the clock. The lower sun angle creates longer shadows and richer golden-hour color, signaling the transition to the cooler, darker months ahead.

Golden Hour & Twilight in September

During September, golden hour in Sunnyvale lasts approximately 54 minutes each morning and evening. The low sun angle during these periods produces warm, directional light prized by photographers and filmmakers. Civil twilight — the period when the sun is just below the horizon — adds extra usable light before sunrise and after sunset, extending the practical daylight window beyond the times shown in the table above.

Through September, days in Sunnyvale are shortening by roughly 2.3 minutes per day, adding up to about 1h 8m over the course of the month.

September 2026 Summary — Sunnyvale

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