Highest temperature in Houston on July 23?

Platform comparison

Market context

Houston’s temperature on 23 July will be judged against the **highest reading at William P. Hobby Airport**, so the key number is the day’s maximum rather than the afternoon forecast alone. On current market pricing, the contract’s **0% YES** implied probability is materially below what traders would usually assign to a summer Houston high landing inside a specified band, which suggests the crowd is treating a qualifying outcome as effectively off the table rather than merely unlikely.

Recent comparable weather in Houston shows how quickly July heat can still produce mid-90s readings: one past-weather record for the city area lists a **95°F high** with light winds, which is consistent with the broader Gulf Coast summer pattern rather than an exceptional spike.[1] That makes the present market reading look detached from historical heat risk unless the contract’s temperature bands are unusually high or narrowly defined. In cross-platform terms, sportsbook-style weather pricing is often much less granular than prediction markets, so any divergence usually comes from whether traders are using the exact station record, the local airport microclimate, or a citywide expectation.

The main catalysts are the morning-to-midday Houston forecast updates, any shift in cloud cover or convective rain chances, and the precise Wunderground station data that will be used for settlement. For a same-day contract ending at 12:00 UTC, traders will watch whether Hobby Airport gets early heating, sea-breeze moderation, or rainfall that suppresses the maximum before the settlement window closes. If forecasts continue to point to a routine summer high rather than an outlier, the current 0% YES implied probability is likely to remain anchored near the floor.

Sources: 1

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

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