Highest temperature in Chicago on August 9?

Platform comparison

Market context

Chicago’s heat on 9 August is shaping up to land close to the seasonal norm rather than anywhere near an extreme, which is why the market’s pricing sits almost entirely in the mid-80s Fahrenheit band. Chicago’s August 9 climatology is an average high of about 83.3°F, and the city’s long-run records show 97°F as the date’s top-end benchmark, so anything in the low-to-mid 80s is historically routine rather than exceptional.[5][6][8][12]

That makes the current 0% YES view on the contract’s narrow temperature range understandable only if traders are watching the wrong data source, because the market settles on Weather Underground’s Daily Observations rather than the Day High & Low summary. Weather Underground’s historical pages explicitly separate those fields, and the contract will use the highest observed temperature in the detailed table for Chicago O’Hare on 9 August 2026 once the next day’s first observation is published.[15][17] Comparable Chicago August 9 readings have often clustered around the low-to-mid 80s, with recent forecast-style snapshots also pointing to an 84-87°F type outcome rather than a heat spike.[3][4][8]

The main catalyst for a move between bands is a late-day revision in the O’Hare observations, especially if the first reading for 10 August appears while a final 9 August update is still pending, because the rules say later alterations after that point will not count.[1][15][17] Traders should therefore watch the Weather Underground Daily Observations feed for KORD rather than broader Chicago summaries, and any late afternoon or evening maximum there will be decisive for settlement.[15][17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Highest temperature in Chicago on August 9?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

UK Frequently Asked Questions

Are prediction markets better than sports betting?

Prediction markets tend toward tighter odds than bookmakers because they use peer-to-peer exchange rather than bookmaker margin. On major matches, Polymarket quotes typically sit 2-5% closer to the true probability model than bet365 or DraftKings.

What are live sports odds on Polymarket?

Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.

Which sports markets are available?

Football (soccer) dominates — Champions League, World Cup, Premier League, La Liga, Bundesliga — followed by NFL, NBA, tennis Grand Slams, Formula 1, boxing/MMA. Resolution via official league source confirmation.

How fast do sports winnings settle?

Once the official league outcome is logged in the UMA Oracle (typically 1-2 hours after the final whistle), Polymarket's smart contract triggers USDC payout. To your wallet within minutes.

Can I trade Premier League prediction markets from the UK?

Yes. Polymarket has Premier League outcome markets (title winner, relegation, top scorer). For UK traders wanting GBP settlement and UKGC protection, Betfair Exchange and Smarkets offer Premier League futures and match markets. Betfair is the deepest liquidity venue for UK football exchange markets.