| Porto Alegre Jhikli Ambwari | India Standard Time | -08:30 |
| Porto Alegre Jessup | Eastern Time | 01:00 |
| Porto Alegre Jesus Maria | Peru Time | 02:00 |
| Porto Alegre Jette | Central European Time | -04:00 |
| Porto Alegre Jettingen-Scheppach | Central European Time | -04:00 |
| Porto Alegre Jindalee | Eastern Australia Time | -13:00 |
| Porto Alegre Jindivick | Eastern Australia Time | -14:00 |
| Porto Alegre Jim Thorpe | Eastern Time | 01:00 |
| Porto Alegre Jinan | China Time | -11:00 |
| Porto Alegre Ironton | Eastern Time | 01:00 |
| Porto Alegre Iruma | Japan Time | -12:00 |
| Porto Alegre Ireland | United Kingdom Time | -03:00 |
| Porto Alegre Ipswich | Eastern Time | 01:00 |
| Porto Alegre Iowa Park | Central Time | 02:00 |
| Porto Alegre Iphofen | Central European Time | -04:00 |
| Porto Alegre Inzell | Central European Time | -04:00 |
| Porto Alegre Inverurie | United Kingdom Time | -03:00 |
| Porto Alegre Inverleigh | Eastern Australia Time | -14:00 |
| Porto Alegre Innaloo | Western Australia Time | -11:00 |
| Porto Alegre Intra | Central European Time | -04:00 |
| Porto Alegre Ingersoll | Eastern Time | 01:00 |
| Porto Alegre Ingleburn | Eastern Australia Time | -14:00 |
| Porto Alegre Inez | Eastern Time | 01:00 |
| Porto Alegre Inishmore | Ireland Time | -03:00 |
| Porto Alegre Indapur | India Standard Time | -08:30 |
| Porto Alegre Indiana | Eastern Time | 01:00 |
| Porto Alegre Indialantic | Eastern Time | 01:00 |
| Porto Alegre Indian Harbour Beach | Eastern Time | 01:00 |
| Porto Alegre Indian Rocks Beach | Eastern Time | 01:00 |
| Porto Alegre Imboden | Central Time | 02:00 |
| Porto Alegre Immenstadt | Central European Time | -04:00 |
| Porto Alegre Incline Village | Pacific Time | 04:00 |
| Porto Alegre Inala | Eastern Australia Time | -13:00 |
| Porto Alegre Inari | Eastern European Time | -05:00 |
| Porto Alegre Ischgl | Central European Time | -04:00 |
| Porto Alegre Irvine | Pacific Time | 04:00 |
| Porto Alegre Irvine | United Kingdom Time | -03:00 |
| Porto Alegre Irving | Central Time | 02:00 |
| Porto Alegre Ishikawa | Japan Time | -12:00 |
| Porto Alegre Issigeac | Central European Time | -04:00 |
| Porto Alegre Islington | Eastern Australia Time | -14:00 |
| Porto Alegre Islamorada | Eastern Time | 01:00 |
| Porto Alegre Islamabad | Pakistan Time | -08:00 |
| Porto Alegre Islandia | Eastern Time | 01:00 |
| Porto Alegre Isle | Central Time | 02:00 |
| Porto Alegre Isla Canela | Central European Time | -04:00 |
| Porto Alegre Isla Mujeres | Eastern Time | 02:00 |
| Porto Alegre Itabashi | Japan Time | -12:00 |
| Porto Alegre Itatiaia | Brasilia Time | 00:00 |
| Porto Alegre Itaunja | India Standard Time | -08:30 |