As explained in the Big Kid Boxes on p. 4-5 of Max Goes to Jupiter, Jupiter is often easy to see in the night sky. Many apps and web sites provide information about whether and where to find Jupiter and other planets in the night sky; here are some that are particularly easy to use:
TimeandDate.com: This link will bring up an interactive sky viewer for your local sky. Click on “Sun, Moon, and Planets” on the left side of the viewer, then click on Jupiter (or whatever planet you want to see) to get details on where it is currently in your local sky.
Sky and Telescope’s “This Week’s Sky”: This site tells you what you can see in the sky tonight and throughout the week, and will let you know if, when, and where Jupiter or other planets will be visible.
The EarthSky site also offers clear info and video about what to see in the night sky.
Apps: You can also find numerous “planetarium” apps that will help you find objects in the sky. With these apps, you can simply point your phone at the sky and they will tell you what is in the field of view; they also have many other powerful features. Many of them are great, including Star Walk 2, Stellarium, SkySafari, and SkyView. You can find some reviews here.
Note: On the above and other astronomy sites, you may sometimes see paid advertisements for horoscopes or other aspects of astrology. Be sure that you don’t confuse astrology with astronomy; although the two words sound much the same — and were often practiced by the same people in ancient times — they have very different meanings today. Astronomy is the science by which we learn about planets, stars, galaxies, and the universe. Astrology arises from ancient superstitions that held that the movements of the planets among the stars of the zodiac could affect our lives. We now know that the planets are too far away to have any gravitational influence on our lives, and tests of the predictions made by astrology show that these predictions come true no more often than would be expected by pure chance. We should not be surprised that astrology doesn’t work. After all, ancient people came up with the ideas of astrology at a time when they thought that Jupiter and the other planets really did move among the constellations, but we now know that is not the case: The planets orbit our Sun, while the stars are other "suns" that are incredibly far away compared to the planets. Moreover, ancient people also assumed that the patterns we see in the constellations had meaning, but we now know that these patterns are illusions that we see from Earth only because we lack depth perception when we look into space; in many cases, the stars that make up the patterns of a constellation are nowhere near each other in reality, because some are much farther away from us than others. (Numerous apps and web applets can show you 3d positions of stars in the sky, so that you can see for yourself that constellations are not necessarily made up of stars that are anywhere near each other.)