Highest temperature in Chicago on July 15?

Platform comparison

Market context

Chicago’s highest temperature on 15 July 2026 will be recorded at O’Hare International Airport, with the market now pricing the 94–95°F range as the frontrunner at 47% probability, while 96–97°F sits at 35% [1]. The current 0% implied probability for a “YES” outcome reflects the market’s view that no single temperature band is guaranteed, but rather that outcomes cluster tightly in the mid-90s. This mirrors the deadly 1995 Chicago heat wave, when temperatures routinely hit the high 90s and fans failed to prevent heat illness once readings exceeded 90°F [2].

Traders should monitor daily Wunderground updates for KORD, the official resolution source, and watch for any National Weather Service heat advisories issued ahead of the settlement window. A recent Patch report on scorching temperatures rivaling 1995 underscores how quickly extreme heat can escalate in Chicago, making real-time forecasts critical [2]. On Polymarket, positions are settled in USDC on Polygon using conditional tokens, meaning liquidity and price shifts hinge on fresh temperature data rather than abstract speculation. With the settlement clock ending 2026-07-15T12:00:00Z, late-day spikes could reshape the distribution before resolution.

Sources: 1 · 2

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.