Sunrise and sunset times (in standard time) and length of day at Rio de Janeiro of each month for the same day of the month during 2018
| Date (day month year) | Sunrise time (standard time) (hour:minute) | Sunset time (standard time) (hour:minute) | Length of Day (hour:minute:second) |
|---|---|---|---|
| 21 January 2018 | 05:24 | 18:43 | 13:18:14 |
| 21 February 2018 | 05:44 | 18:27 | 12:43:06 |
| 21 March 2018 | 05:56 | 18:02 | 12:05:48 |
| 21 April 2018 | 06:08 | 17:34 | 11:26:01 |
| 21 May 2018 | 06:21 | 17:17 | 10:55:48 |
| 21 June 2018 | 06:32 | 17:16 | 10:43:21 |
| 21 July 2018 | 06:31 | 17:26 | 10:55:13 |
| 21 August 2018 | 06:13 | 17:38 | 11:25:56 |
| 21 September 2018 | 05:43 | 17:48 | 12:05:05 |
| 21 October 2018 | 05:15 | 17:59 | 12:44:26 |
| 21 November 2018 | 04:59 | 18:18 | 13:18:52 |
| 21 December 2018 | 05:04 | 18:37 | 13:33:01 |