Jupiter: Jupiter is at opposition on January 10 and it’s very well placed for evening viewing in the first three months of the year. By May it sinks into the west at twilight and then disappears behind the Sun. It returns in the dawn sky in September and by November it’s up before midnight. Fortunately for northern hemisphere observers, Jupiter is far to the north, in Gemini.
At the start of the year, we’re looking from a direction a bit over 1° north of the plane of Jupiter’s equator, so the Galilean moons appear to travel on only slightly oval paths so they (and their shadows) all pass in front of Jupiter. They also get eclipsed by Jupiter’s shadow and occulted by (pass behind) the planet. This handy Jupiter's Moons link from Sky & Telescope Magazine will guide you to the moons and what they’re doing tonight. By the end of the year, we’re almost exactly in the plane of their orbits, so check your favorite stargazing magazine for news of when there will be mutual events of the moons, as there were back in 2021.
As always, look for the zones and belts. Even when its color is subdued, you should look for the Great Red Spot in the southern equatorial belt within an hour or so of when Jupiter’s rotation brings it towards us (this handy Red Spot transit times link, also from S&T Magazine will tell you when to look).
Saturn: In 2026 Saturn is at opposition on October 4. It’s visible before dawn by June, and in November and December it’s well placed at the end of twilight.
To know where they are on any night, consult this useful Saturn's Moons link to from Sky and Telescope to keep track of them (they also have a handy mobile app).