No.
All circumpolar constellations are found near the celestial poles. Because of their proximity to the poles, they never disappear from view. Sagittarius is on the ecliptic and thus (like all other zodiac constellations) not close enough to the poles to render it circumpolar.
"Circumpolar" means it is always above the horizon.
Cygnus is a constellation not quite circumpolar. It is visible from June to October. One of the best observing times for this constellation is in September at 9:00 PM.
The constellation Leo is a seasonal constellation. It can be seen most prominently in the springtime in the Northern Hemisphere. It is not a circumpolar constellation, which means it cannot be seen all year round from most locations on Earth.
gemini is not circumpolar. the circumpolar constellations for the northern hemisphere are Cassiopeia. Ursa Minor, Draco, Cepheus, and Ursa Major.
Circumpolar, like beauty, is in the eye of the beholder. Technically, a circumpolar constellation is one that never sets, but just goes around the elevated pole. That's the north star Polaris in the northern hemisphere, or the blank spot of space above the south pole. This, however, depends on your latitude; the higher your latitude, the more constellations are "circumpolar" for you. I live near Sacramento, CA, USA, at latitude about 38 degrees north, so any constellation within 38 degrees of Polaris is "circumpolar" for me. That includes constellations such as Ursa Major, Cassiopeia, and Draco, but not constellations like Orion.
Octans (the octant).
Circumpolar constellations are those that, from the viewer's latitude, never set. Any constellation found in the zodiac is not circumpolar. These are seasonal. Pisces appears in the Spring in the Southern hemisphere and in Autumn in the Northern hemisphere.
All of them - except the ones that are circumpolar (that don't rise or set at all). Which ones are circumpolar depends on your latitude.
The constellation Cassiopeia is often described as looking like a letter "M" or "W" and is located in the northern circumpolar region, making it visible year-round in the northern hemisphere. It is named after the queen Cassiopeia in Greek mythology.
Scorpius is a seasonal constellation in most regions of the world. It is not circumpolar, meaning it is only visible in certain months of the year and at specific times of the night.
In the northern hemisphere, it can be seen at any time of year, as it is a circumpolar constellation.
The southern circumpolar constellation that contains the stellar south pole is called Octans. It is a faint constellation located close to the south celestial pole, making it useful for navigation in the Southern Hemisphere. Octans is named after the octant, a navigational tool used for determining latitude that was the precursor to the modern sextant.