Maandkalender september 2021. Voor elke dag in september zie je het weeknummer, zonsopkomst, zonsondergang en aantal uren licht.
Maanstanden
| week 38 | 21 september | Prinsjesdag |
| week 38 | 22 september | Herfst |
| wo | 1 september | ↑ | 06:51 | ↓ | 20:29 | ☀ | 13u 38m |
| do | 2 september | ↑ | 06:53 | ↓ | 20:27 | ☀ | 13u 34m |
| vr | 3 september | ↑ | 06:54 | ↓ | 20:24 | ☀ | 13u 30m |
| za | 4 september | ↑ | 06:56 | ↓ | 20:22 | ☀ | 13u 26m |
| zo | 5 september | ↑ | 06:58 | ↓ | 20:20 | ☀ | 13u 22m |
| ma | 6 september | ↑ | 06:59 | ↓ | 20:17 | ☀ | 13u 18m |
| di | 7 september | ↑ | 07:01 | ↓ | 20:15 | ☀ | 13u 14m |
| wo | 8 september | ↑ | 07:03 | ↓ | 20:13 | ☀ | 13u 10m |
| do | 9 september | ↑ | 07:04 | ↓ | 20:10 | ☀ | 13u 6m |
| vr | 10 september | ↑ | 07:06 | ↓ | 20:08 | ☀ | 13u 2m |
| za | 11 september | ↑ | 07:08 | ↓ | 20:06 | ☀ | 12u 58m |
| zo | 12 september | ↑ | 07:09 | ↓ | 20:03 | ☀ | 12u 54m |
| ma | 13 september | ↑ | 07:11 | ↓ | 20:01 | ☀ | 12u 50m |
| di | 14 september | ↑ | 07:12 | ↓ | 19:59 | ☀ | 12u 47m |
| wo | 15 september | ↑ | 07:14 | ↓ | 19:56 | ☀ | 12u 42m |
| do | 16 september | ↑ | 07:16 | ↓ | 19:54 | ☀ | 12u 38m |
| vr | 17 september | ↑ | 07:17 | ↓ | 19:52 | ☀ | 12u 35m |
| za | 18 september | ↑ | 07:19 | ↓ | 19:49 | ☀ | 12u 30m |
| zo | 19 september | ↑ | 07:21 | ↓ | 19:47 | ☀ | 12u 26m |
| ma | 20 september | ↑ | 07:22 | ↓ | 19:44 | ☀ | 12u 22m |
| di | 21 september | ↑ | 07:24 | ↓ | 19:42 | ☀ | 12u 18m |
| wo | 22 september | ↑ | 07:26 | ↓ | 19:40 | ☀ | 12u 14m |
| do | 23 september | ↑ | 07:27 | ↓ | 19:37 | ☀ | 12u 10m |
| vr | 24 september | ↑ | 07:29 | ↓ | 19:35 | ☀ | 12u 6m |
| za | 25 september | ↑ | 07:31 | ↓ | 19:33 | ☀ | 12u 2m |
| zo | 26 september | ↑ | 07:32 | ↓ | 19:30 | ☀ | 11u 58m |
| ma | 27 september | ↑ | 07:34 | ↓ | 19:28 | ☀ | 11u 54m |
| di | 28 september | ↑ | 07:36 | ↓ | 19:25 | ☀ | 11u 49m |
| wo | 29 september | ↑ | 07:38 | ↓ | 19:23 | ☀ | 11u 45m |
| do | 30 september | ↑ | 07:39 | ↓ | 19:21 | ☀ | 11u 42m |
Week 36 in 2021 begint op maandag 6 september en eindigt op zondag 12 september.
Week 37 in 2021 begint op maandag 13 september en eindigt op zondag 19 september.
Op dinsdag 21 september 2021 is het prinsjesdag.
Dinsdag 21 september 2021 valt in week 38. Week 38 begint op maandag 20 september en eindigt op zondag 26 september.
Op woensdag 22 september 2021 is het herfst.
Woensdag 22 september 2021 valt in week 38. Week 38 begint op maandag 20 september en eindigt op zondag 26 september.
Week 38 in 2021 begint op maandag 20 september en eindigt op zondag 26 september.
Week 39 in 2021 begint op maandag 27 september en eindigt op zondag 3 oktober.
September 2021 heeft 5 weken. Week 35 start op maandag 30 augustus en week 39 start op maandag 27 september.