A past weekend. Written after the fact from what local sources listed and the weather that actually happened.
St. Louis stayed cloudy and dry, with a high near 72 on Saturday, 80 on Sunday and lows near 52. The listing was a scavenger hunt at the Gateway Arch on both mornings.
What the weather did
Saturday
72° / 52°
Cloudy, no rain.
Sunday
80° / 52°
Cloudy, no rain.
The weather rule that weekend: Great weather. Stay outside as long as the kids will let you.