TOTAL VOLUME:
$134.1b
24H VOL:
$133,388,117
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,436,095,462
405,232
Markets across
30,526
events
MATCHED EVENTS:
2,693
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Aug 19, 2:00 AM EST
Kalshi
In Chicago, August 18, 2026, may bring heat typical of late summer, with temperatures influenced by lake effects and regional highs that could shift dramatically throughout the day.
The market resolves based on the maximum temperature at Chicago (CLIMDW) on August 18, 2026, as officially reported by The Weather Company. Six temperature bands are defined, and a Yes outcome occurs if the actual maximum falls within any specified band. Secondary instructions confirm that The Weather Company’s data overrides any conflicting reports from alternative weather providers.