The sun, month by month
Sunrise and sunset in Chicago in October
On October 1 in Chicago the sun rises at 06:50 and sets at 18:29; on day 31 it rises at 07:25 and sets at 17:43. Over the month the day gets 81 minutes shorter.
Sunrise07:06
Sunset18:05
Golden hour17:27–18:05
Day length10 h 59 min
Day by day
All times are local to Chicago. Dawn and dusk mark civil twilight.
| Day | Dawn | Sunrise | Sunset | Dusk | Day length |
|---|---|---|---|---|---|
| 1 | 06:22 | 06:50 | 18:29 | 18:56 | 11 h 39 min |
| 2 | 06:23 | 06:51 | 18:27 | 18:55 | 11 h 36 min |
| 3 | 06:24 | 06:52 | 18:25 | 18:53 | 11 h 33 min |
| 4 | 06:26 | 06:53 | 18:23 | 18:51 | 11 h 30 min |
| 5 | 06:27 | 06:54 | 18:22 | 18:50 | 11 h 27 min |
| 6 | 06:28 | 06:56 | 18:20 | 18:48 | 11 h 24 min |
| 7 | 06:29 | 06:57 | 18:18 | 18:46 | 11 h 22 min |
| 8 | 06:30 | 06:58 | 18:17 | 18:45 | 11 h 19 min |
| 9 | 06:31 | 06:59 | 18:15 | 18:43 | 11 h 16 min |
| 10 | 06:32 | 07:00 | 18:13 | 18:41 | 11 h 13 min |
| 11 | 06:33 | 07:01 | 18:12 | 18:40 | 11 h 10 min |
| 12 | 06:34 | 07:02 | 18:10 | 18:38 | 11 h 08 min |
| 13 | 06:36 | 07:04 | 18:09 | 18:37 | 11 h 05 min |
| 14 | 06:37 | 07:05 | 18:07 | 18:35 | 11 h 02 min |
| 15 | 06:38 | 07:06 | 18:05 | 18:34 | 10 h 59 min |
| 16 | 06:39 | 07:07 | 18:04 | 18:32 | 10 h 57 min |
| 17 | 06:40 | 07:08 | 18:02 | 18:31 | 10 h 54 min |
| 18 | 06:41 | 07:09 | 18:01 | 18:29 | 10 h 51 min |
| 19 | 06:42 | 07:11 | 17:59 | 18:28 | 10 h 49 min |
| 20 | 06:43 | 07:12 | 17:58 | 18:26 | 10 h 46 min |
| 21 | 06:45 | 07:13 | 17:56 | 18:25 | 10 h 43 min |
| 22 | 06:46 | 07:14 | 17:55 | 18:23 | 10 h 41 min |
| 23 | 06:47 | 07:15 | 17:53 | 18:22 | 10 h 38 min |
| 24 | 06:48 | 07:17 | 17:52 | 18:21 | 10 h 35 min |
| 25 | 06:49 | 07:18 | 17:51 | 18:19 | 10 h 33 min |
| 26 | 06:50 | 07:19 | 17:49 | 18:18 | 10 h 30 min |
| 27 | 06:51 | 07:20 | 17:48 | 18:17 | 10 h 28 min |
| 28 | 06:53 | 07:21 | 17:47 | 18:16 | 10 h 25 min |
| 29 | 06:54 | 07:23 | 17:45 | 18:14 | 10 h 23 min |
| 30 | 06:55 | 07:24 | 17:44 | 18:13 | 10 h 20 min |
| 31 | 06:56 | 07:25 | 17:43 | 18:12 | 10 h 18 min |
Approximate astronomical values: they can shift a minute or two from year to year.
What about vitamin D in October?
In October, the typical synthesis window in Chicago runs from 12:00 to 15:00: with medium skin and a t-shirt, ~15 min at the best moment is enough.
See the Chicago vitamin D guide