Highest temperature in Houston on July 23?

Platform comparison

Market context

Houston’s heat is the event, with the market’s **0% YES** implying the crowd is effectively pricing in a very hot day but not a top-bin result. For a handicapper, that makes the field look like a **strong favourite** on a high but not extreme reading, with the value debate sitting on whether Hobby Airport can push into the upper tail rather than merely printing a routine July high. Local conditions data for Houston show a recent summer day with a **95°F** high, which is consistent with the sort of range that keeps this contract live but not yet forced into the very top bracket.[1]

The historical read is straightforward: late-July Houston usually delivers hot afternoons, but the market only resolves on the *highest* temperature logged at William P. Hobby Airport on the day, so a trader needs to focus on the ceiling rather than the average. In that framing, the consensus favours a broadly warm outcome, while any value lies in a contrarian view that cloud cover, onshore flow, or earlier convection keeps the maximum below the more aggressive bands. The key comparison is between a normal oppressive Gulf Coast summer peak and a true spike well above the everyday mid-90s pattern; the latter is what would justify a more bullish view than the current zero-priced YES.[1]

Catalysts are mostly meteorological rather than calendar-driven: the shape of the afternoon forecast, humidity, cloud build-up, and whether thunderstorms or sea-breeze effects arrive early enough to cap the high. There are no scheduled corporate or policy announcements to watch here, so the relevant dependency is the day’s live weather evolution at Hobby Airport and any short-range forecast updates from the National Weather Service or similar forecasters; by midday Houston time, the market should start to reflect whether the maximum temperature is likely to stay in the consensus band or overshoot it.

Sources: 1

Methodology

We track Highest temperature in Houston on July 23? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.