San Mateo, CA sky calendar · December 2026
Full moon: Wed, Dec 23. New moon: Tue, Dec 8. Sunrise moves from 7:05 AM to 7:23 AM, sunset from 4:51 PM to 5:00 PM. 2 sky events this month (below). Times are local (PST).
| Date | Sunrise | Sunset | Moonrise | Moonset | Moon |
|---|---|---|---|---|---|
| Tue, Dec 1 | 7:05 AM | 4:51 PM | — | 12:45 PM | Waning crescent · 44% |
| Wed, Dec 2 | 7:06 AM | 4:50 PM | 12:58 AM | 1:09 PM | Waning crescent · 34% |
| Thu, Dec 3 | 7:07 AM | 4:50 PM | 2:02 AM | 1:34 PM | Waning crescent · 24% |
| Fri, Dec 4 | 7:08 AM | 4:50 PM | 3:05 AM | 2:00 PM | Waning crescent · 16% |
| Sat, Dec 5 | 7:09 AM | 4:50 PM | 4:07 AM | 2:28 PM | Waning crescent · 10% |
| Sun, Dec 6 | 7:09 AM | 4:50 PM | 5:10 AM | 3:01 PM | Waning crescent · 5% |
| Mon, Dec 7 | 7:10 AM | 4:50 PM | 6:12 AM | 3:39 PM | Waning crescent · 2% |
| Tue, Dec 8 | 7:11 AM | 4:50 PM | 7:11 AM | 4:24 PM | New moon · 0% |
| Wed, Dec 9 | 7:12 AM | 4:50 PM | 8:06 AM | 5:14 PM | Waxing crescent · 1% |
| Thu, Dec 10 | 7:13 AM | 4:50 PM | 8:54 AM | 6:10 PM | Waxing crescent · 3% |
| Fri, Dec 11 | 7:14 AM | 4:51 PM | 9:35 AM | 7:10 PM | Waxing crescent · 7% |
| Sat, Dec 12 | 7:14 AM | 4:51 PM | 10:10 AM | 8:10 PM | Waxing crescent · 12% |
| Sun, Dec 13 | 7:15 AM | 4:51 PM | 10:39 AM | 9:10 PM | Waxing crescent · 19% |
| Mon, Dec 14 | 7:16 AM | 4:51 PM | 11:05 AM | 10:10 PM | Waxing crescent · 27% |
| Tue, Dec 15 | 7:16 AM | 4:52 PM | 11:29 AM | 11:10 PM | Waxing crescent · 36% |
| Wed, Dec 16 | 7:17 AM | 4:52 PM | 11:53 AM | — | First quarter · 46% |
| Thu, Dec 17 | 7:18 AM | 4:52 PM | 12:16 PM | 12:11 AM | Waxing gibbous · 56% |
| Fri, Dec 18 | 7:18 AM | 4:53 PM | 12:42 PM | 1:15 AM | Waxing gibbous · 66% |
| Sat, Dec 19 | 7:19 AM | 4:53 PM | 1:11 PM | 2:21 AM | Waxing gibbous · 76% |
| Sun, Dec 20 | 7:19 AM | 4:54 PM | 1:46 PM | 3:33 AM | Waxing gibbous · 85% |
| Mon, Dec 21 | 7:20 AM | 4:54 PM | 2:30 PM | 4:48 AM | Waxing gibbous · 93% |
| Tue, Dec 22 | 7:20 AM | 4:55 PM | 3:26 PM | 6:03 AM | Waxing gibbous · 98% |
| Wed, Dec 23 | 7:21 AM | 4:55 PM | 4:33 PM | 7:14 AM | Full moon · 100% |
| Thu, Dec 24 | 7:21 AM | 4:56 PM | 5:50 PM | 8:16 AM | Waning gibbous · 99% |
| Fri, Dec 25 | 7:22 AM | 4:56 PM | 7:09 PM | 9:06 AM | Waning gibbous · 95% |
| Sat, Dec 26 | 7:22 AM | 4:57 PM | 8:26 PM | 9:46 AM | Waning gibbous · 89% |
| Sun, Dec 27 | 7:22 AM | 4:58 PM | 9:39 PM | 10:18 AM | Waning gibbous · 80% |
| Mon, Dec 28 | 7:23 AM | 4:58 PM | 10:47 PM | 10:47 AM | Waning gibbous · 71% |
| Tue, Dec 29 | 7:23 AM | 4:59 PM | 11:53 PM | 11:12 AM | Waning gibbous · 60% |
| Wed, Dec 30 | 7:23 AM | 5:00 PM | — | 11:37 AM | Last quarter · 50% |
| Thu, Dec 31 | 7:23 AM | 5:00 PM | 12:57 AM | 12:03 PM | Waning crescent · 39% |
Sky events this month
- Sun, Dec 13Geminids meteor shower peakUp to about 150 meteors an hour under a perfectly dark sky · the Moon stays out of the way
- Wed, Dec 23 5:28 PMFull moonSupermoon: a full moon close to Earth, slightly bigger and brighter
Month by month
Calculated with Astronomy Engine (MIT license).