The sun, month by month
Sunrise and sunset in Buenos Aires in September
On September 1 in Buenos Aires the sun rises at 07:10 and sets at 18:36; on day 30 it rises at 06:28 and sets at 18:57. Over the month the day grows 64 minutes longer.
Where does the sun rise and set in Buenos Aires in September?
Mid-September in Buenos Aires: the sun rises in the east — a bearing of 88°, measured from true north — and sets in the west, at 272°. That is 2° north of due east at sunrise, and the same 2° north of due west at sunset. From the 1st to the last day of the month both points shift 14° south.
Approximate bearings: they can be a couple of degrees out. They are measured from true north, not the north a phone compass points to.
Day by day
All times are local to Buenos Aires. Dawn and dusk mark civil twilight.
| Day | Dawn | Sunrise | Sunset | Dusk | Day length |
|---|---|---|---|---|---|
| 1 | 06:45 | 07:10 | 18:36 | 19:01 | 11 h 25 min |
| 2 | 06:44 | 07:09 | 18:36 | 19:02 | 11 h 27 min |
| 3 | 06:42 | 07:08 | 18:37 | 19:02 | 11 h 30 min |
| 4 | 06:41 | 07:06 | 18:38 | 19:03 | 11 h 32 min |
| 5 | 06:40 | 07:05 | 18:39 | 19:04 | 11 h 34 min |
| 6 | 06:38 | 07:03 | 18:39 | 19:05 | 11 h 36 min |
| 7 | 06:37 | 07:02 | 18:40 | 19:05 | 11 h 38 min |
| 8 | 06:35 | 07:00 | 18:41 | 19:06 | 11 h 40 min |
| 9 | 06:34 | 06:59 | 18:42 | 19:07 | 11 h 43 min |
| 10 | 06:32 | 06:57 | 18:42 | 19:07 | 11 h 45 min |
| 11 | 06:31 | 06:56 | 18:43 | 19:08 | 11 h 47 min |
| 12 | 06:29 | 06:55 | 18:44 | 19:09 | 11 h 49 min |
| 13 | 06:28 | 06:53 | 18:44 | 19:10 | 11 h 51 min |
| 14 | 06:26 | 06:52 | 18:45 | 19:10 | 11 h 54 min |
| 15 | 06:25 | 06:50 | 18:46 | 19:11 | 11 h 56 min |
| 16 | 06:23 | 06:49 | 18:47 | 19:12 | 11 h 58 min |
| 17 | 06:22 | 06:47 | 18:47 | 19:13 | 12 h 00 min |
| 18 | 06:21 | 06:46 | 18:48 | 19:13 | 12 h 03 min |
| 19 | 06:19 | 06:44 | 18:49 | 19:14 | 12 h 05 min |
| 20 | 06:18 | 06:43 | 18:50 | 19:15 | 12 h 07 min |
| 21 | 06:16 | 06:41 | 18:50 | 19:16 | 12 h 09 min |
| 22 | 06:15 | 06:40 | 18:51 | 19:16 | 12 h 11 min |
| 23 | 06:13 | 06:38 | 18:52 | 19:17 | 12 h 14 min |
| 24 | 06:12 | 06:37 | 18:53 | 19:18 | 12 h 16 min |
| 25 | 06:10 | 06:35 | 18:53 | 19:19 | 12 h 18 min |
| 26 | 06:09 | 06:34 | 18:54 | 19:19 | 12 h 20 min |
| 27 | 06:07 | 06:32 | 18:55 | 19:20 | 12 h 23 min |
| 28 | 06:06 | 06:31 | 18:56 | 19:21 | 12 h 25 min |
| 29 | 06:04 | 06:30 | 18:57 | 19:22 | 12 h 27 min |
| 30 | 06:03 | 06:28 | 18:57 | 19:23 | 12 h 29 min |
Approximate astronomical values: they can shift a minute or two from year to year.
What about vitamin D in September?
In September, the typical synthesis window in Buenos Aires runs from 10:00 to 16:00: with medium skin and a t-shirt, ~8 min at the best moment is enough.
See the Buenos Aires vitamin D guideCommon questions about the sun in Buenos Aires in September
- Where does the sun set in Buenos Aires in September?
- Mid-September in Buenos Aires: the sun sets in the west, a bearing of 272° measured from true north, which is 2° north of due west. It rises in the east, at 88°. Over the month both points shift 14° south.
- How much daylight does Buenos Aires gain in September?
- Over September the day gets 64 minutes longer in Buenos Aires: on September 1 the sun rises at 07:10 and sets at 18:36, and on day 30 it rises at 06:28 and sets at 18:57.
- How many hours of daylight does Buenos Aires get in September?
- In mid-September the day lasts 11 h 56 min in Buenos Aires, from sunrise at 06:50 to sunset at 18:46. The table has the day length for each of the 30 days of the month.
- What time does it start to get light in Buenos Aires in September?
- In mid-September the sky starts to get light at 06:25 in Buenos Aires, when the sun is 6° below the horizon, and the sun itself does not rise until 06:50. The “Dawn” column of the table gives that time for every day of the month.
- What time does it get dark in Buenos Aires in September?
- It's not the same time as sunset. In mid-September in Buenos Aires the sun sets at 18:46, but there is still light: civil twilight does not end until 19:11, when the sun reaches 6° below the horizon and usable outdoor light runs out. The “Dusk” column of the table gives that time day by day.
- What time of day can you make vitamin D in Buenos Aires in September?
- In mid-September, between 10:00 and 16:00: that is the stretch of the day when the UV index reaches 3 in Buenos Aires, the minimum for the skin to make vitamin D. At the best moment of the day about 8 minutes are enough for a mid-range skin phototype with a quarter of the body exposed to make around 1000 IU.