Highest temperature in NYC on July 12?

Platform comparison

Market context

New York City is currently enduring an unprecedented heatwave, with LaGuardia Airport recording 104°F on 3 July 2026, shattering a 60-year record by three degrees. This extreme event frames the current 0% implied probability for any specific temperature range on 12 July, as traders recognise that mid-July highs in the city have historically clustered between 86°F and 99°F, though the 2026 anomaly suggests a potential breakout. The persistence of record-breaking temperatures across a 500-mile East Coast corridor indicates that the 12 July settlement could defy seasonal norms, making the zero probability on specific ranges a reflection of market uncertainty rather than a guarantee of cooler conditions.

Traders monitoring this event must watch the National Weather Service’s daily climate normals and any updated heat advisories for the New York metropolitan area, as the current wave has already killed 29 people in neighbouring New Jersey. The divergence between prediction platforms is stark here: Polymarket displays this as a 0% implied probability, whereas Kalshi or Betfair would likely express this as decimal odds of infinity or a non-existent market due to the lack of liquidity on such an extreme outlier. Furthermore, while Polymarket operates with minimal KYC and lower fees, competitors like Smarkets impose stricter identity verification and higher commission structures, potentially limiting access for traders seeking to hedge against this record-breaking heat scenario.

The resolution source, Wunderground, will capture the highest temperature for all times on 12 July, meaning even a late-evening spike could trigger a settlement outside expected ranges. Given the historical precedent of 107°F at LaGuardia in 1966 and the current 104°F peak, the market’s zero probability on specific ranges appears to stem from the inability to price the sheer volatility of this 2026 heatwave. As the settlement window closes at 12:00 UTC on 12 July, the focus remains on whether the current thermal anomaly continues or if the city experiences a brief cooling interval before the deadline.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in NYC on July 12? 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 Polymarket 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.

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. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

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.