Highest temperature in Houston on July 23?

Platform comparison

Market context

Houston’s outcome will hinge on the hottest reading logged at William P. Hobby Airport during the day, and the market is really a bet on whether the city gets a routine midsummer high or an unusually subdued one. Houston in July is normally warm and humid, with average temperatures around 77°F to 96°F and regular rain chances, so the centre of gravity for this market is in the upper 80s to mid-90s rather than anything extreme.[3]

A 0% crowd-implied probability for the YES side suggests traders are effectively pricing in an outcome outside the designated band, or treating the current setup as mispriced before the weather is fully known. For comparison, Polymarket typically shows implied probability directly, while Kalshi and Betfair-style books are usually easier to read as price or decimal odds, with fees and market access varying by venue; in practice, that means the same weather view can look “cheap” on one platform and near-par on another once commission, spread and contract conventions are included. On a day like this, the key historical cue is that Houston’s daily highs often cluster tightly around the forecast high unless storms, sea-breeze shifts or late-morning cloud cover intervene.[3]

The main catalysts are the morning forecast updates, any convective-rain timing, and whether the airport station sees cloud cover or outflow boundaries that cap the maximum temperature before early afternoon. The resolution source is Wunderground’s daily history for KHOU, so traders will watch the live hourly track at Hobby Airport rather than citywide headlines; if a forecast is already being adjusted down by local conditions, that usually matters more than broader regional temperatures. Recent past-weather pages show Houston can still reach the mid-90s even on humid, foggy days, so the gap between morning conditions and the final daily maximum can be material.[1][2]

Sources: 1 · 2 · 3

Methodology

This page compares Highest temperature in Houston on July 23? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.