Perseids 2027: the moon at peak

Aug 12, 2027, 22:34 UTC · Calculated July 26, 2026

84% Mixed — significant moonlight for part of the night.

Peak and moon conditions

Peak (UTC)

Aug 12, 2027, 22:34 UTC

Illumination

84%

Waxing gibbous

Peak rate (ZHR)

~100/hour

Radiant

Perseus

Active period

Jul 17 – Aug 24

Peak night by city

For each city: the local time of the peak, and how much of that night is both astronomically dark and free of moonlight.

City	Peak (local time)	Astronomical darkness	Moon-free darkness	Moonrise	Moonset	Rating
Seoul	Fri, Aug 13 07:34	7.0 h	2.6 h	16:20	01:33 (+1)	Fair
Tokyo	Fri, Aug 13 07:34	7.2 h	2.6 h	15:21	00:47 (+1)	Fair
New York	Thu, Aug 12 18:34	6.6 h	2.0 h	17:23	02:16 (+1)	Fair
Los Angeles	Thu, Aug 12 15:34	7.4 h	1.9 h	17:02	02:44 (+1)	Poor
London	Thu, Aug 12 23:34	4.3 h	2.0 h	18:16	01:12 (+1)	Fair
Madrid	Fri, Aug 13 00:34	6.6 h	2.2 h	18:32	03:25 (+1)	Fair
Sydney	Fri, Aug 13 08:34	10.4 h	1.4 h	12:40	03:51 (+1)	Poor
São Paulo	Thu, Aug 12 19:34	10.2 h	1.3 h	13:50	03:59 (+1)	Poor

Why the moon decides a meteor shower

Meteor rates quoted as ZHR assume a perfectly dark sky with the radiant overhead. Real counts fall off fast with sky brightness, and the moon is the one source of sky brightness that is completely predictable years ahead. A full moon near the peak can cut visible meteors by three quarters even under a cloudless sky. That is why the useful question is not “when is the peak” but “where is the moon at the peak” — which is what this page computes.

Other years

Other meteor showers

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