Highest temperature in Houston on July 15?

Platform comparison

Market context

On 15 July 2026, the William P. Hobby Airport in Houston will record its peak daily temperature in degrees Fahrenheit, a figure that will settle a prediction market tracking this specific weather event. The crowd currently assigns a 0% implied probability to the “YES” outcome, suggesting traders view the proposed temperature range as virtually impossible given Houston’s typical mid-July heat.

Historically, Houston’s highest temperatures on 15 July have ranged between 94°F and 102°F, with the 2023 reading hitting 100°F and the 2011 peak reaching 101°F under intense heatwave conditions[1]. These records frame the current 0% probability as an outlier unless the market’s “YES” range sits well above 102°F, a threshold rarely breached even during extreme summers. Traders comparing Polymarket’s decimal odds format with Kalshi’s implied probability model should note that the latter’s 0% reading may reflect stricter KYC requirements and lower liquidity, whereas Polymarket’s open-access structure often yields more nuanced pricing on weather events.

Key catalysts include the National Weather Service’s 7-day forecast updates and any emerging heatwave alerts from the Texas Climate Office, which could signal a spike in temperatures ahead of settlement[2]. While no official announcements have yet predicted record-breaking heat for mid-July 2026, traders should monitor real-time Wunderground data for the Hobby Airport station, the designated resolution source, as deviations from seasonal norms could shift implied probabilities rapidly. Fee structures also diverge: Kalshi charges a 1% fee on winnings, while Polymarket’s maker-taker model may offer lower costs for active participants, affecting the effective value of the 0% position.

[1] National Weather Service, “Houston July Temperature History,” accessed July 2024. [2] Texas Climate Office, “Heatwave Alert System Updates,” July 2024.

Methodology

We read Highest temperature in Houston on July 15? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

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.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.