Highest temperature in NYC on July 26?

Platform comparison

Market context

The key event is the **highest temperature recorded at LaGuardia Airport** on 26 July 2026, which will decide this market’s settlement band. Polymarket’s live book currently shows **84–85°F** as the leading outcome at **41%**, with **82–83°F** next at **36%**, so the crowd is still clustering around the mid-80s rather than a cooler day.[1]

That backdrop matters because summer NYC temperature markets usually clear in a fairly tight range unless there is a strong heat signal or a sharp weather-model shift. A published day-ahead forecast for New York on 26 July showed a **28°C** maximum, roughly **82°F**, which sits close to Polymarket’s second-most likely bucket and helps explain why the market is not pricing an extreme tail at the open.[2] For platform comparison, the same event can be read differently: Polymarket displays **implied probability** by outcome, while Kalshi-style markets are typically quoted in **prices near 0–100**, and Betfair or Smarkets would frame the same view through exchange odds and commission rather than a binary probability line. In practice, that means fee drag and execution style matter more than the headline number when traders compare books on a temperature market like this.

The main catalysts are late-run forecast changes, especially any NYC heat advisory, updated National Weather Service guidance, and whether cloud cover or sea breeze suppresses the afternoon peak. Wego’s recent heat-wave coverage noted forecasters warning of much hotter conditions across parts of the city in some scenarios, with the most intense heat typically building in the **11am to 4pm** window; for this market, the trading question is whether LaGuardia reaches the low- to mid-80s or pushes into the upper-80s before the settlement window closes.[3]

Sources: 1 · 2 · 3

Methodology

This page compares Highest temperature in NYC on July 26? 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.

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.