From astronomy.com:

Planetary behemoth Jupiter will shine bigger and brighter September 21 than it has in almost 50 years. That's when it lies at opposition, putting it directly opposite the Sun in Earth's sky. On the 21st, the jovian giant will rise at sunset, set at sunrise, and remain visible all night.

This opposition is special because Jupiter, the largest of all the solar system's planets, will soon reach perihelion, the closest point in its orbit to the Sun. That means it's physically closer to Earth during this opposition than a normal one. It will rise below the Circlet asterism in the constellation Pisces the Fish and present its best views high in the sky, when its light travels through less of Earth's atmosphere.

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