Peak summer highs in Eureka average 87°F — warm enough for a splash pad through most of the season without being punishing at midday.
The things that decide a trip with small children — a toilet, some shade, somewhere to sit — are exactly what listings usually leave out. Across the 1 pads in Eureka:
Hurricane Harbor (Six Flags St. Louis) · Eureka, Missouri
seasonal (summer) · typically daylight hours
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The water park inside Six Flags St. Louis features the 132-foot Tornado tunnel slide, the Big Kahuna family raft ride, and Adventure Cove, an interactive kids zone with a giant dumping bucket and pirate ship. Entry requires Six Flags admission plus the water park charge.
On site: toilets on site, drinking water, playground alongside, parking
✓ Last confirmed for the 2026 season