June 2026 is one of the most astrologically significant months of the year, featuring powerful planetary transits and a Mercury retrograde that can influence relationships, career decisions, finances, communication, and personal growth. From Jupiter’s move into Cancer to Mercury turning retrograde in the same sign, every zodiac sign will experience important energetic changes. Here's a complete guide to the major June 2026 planetary transits and what they could mean for your horoscope.