Highest temperature in Houston on August 9?

Platform comparison

Market context

Houston’s main temperature readout on 9 August was expected to top out in the low 90s Fahrenheit, with Weather Underground’s framing pointing to the **92–93°F** band as the clear market favourite.[1] The current crowd-implied probability is **0% YES** for the alternative being priced, which is a classic underdog setup: consensus is effectively all-in on a warm but not extreme afternoon, and the value case is only in a sharper-than-expected deviation from that forecast path.[1]

For context, Houston in August normally sits in a hot, humid regime where a day landing around 92°F is unremarkable rather than exceptional, so the market’s favourite is anchored in seasonal normality rather than a special weather setup.[10] That means the handicapper’s read is straightforward: the favourite is the temperature band matching a standard late-summer Houston high, while the contrarian angle depends on whether convection, cloud cover, or timing around the observation window clips the top end. The market’s own description also matters, because settlement follows the **Daily Observations** table rather than the summary high/low, so even a small discrepancy in recorded obs can decide the range.[1]

The key catalysts are the day’s actual observed peak at William P. Hobby Airport and any late revisions before the first datapoint for the following date is published, since the market allows temperature updates within that settlement window.[1] Traders should watch the Weather Underground history feed for KHOU closely, and any nearby National Weather Service discussion or forecast updates that indicate afternoon thunderstorms, which can suppress the maximum if they arrive early enough.[1][4] In practical terms, the consensus sits with the 92–93°F band, and the only real value spot is a weather-structure surprise that pushes the realised high below or above that tight range.

Sources: 1 · 2 · 3 · 4 · 5

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.