Highest temperature in NYC on July 16?

Platform comparison

Market context

New York City is bracing for its peak July heat as traders assess whether the LaGuardia Airport Station will record a temperature above 93°F on 16 July 2026. The crowd currently backs a “YES” outcome at 62% implied probability, suggesting a hot day is likely. This sentiment follows a record-breaking heatwave last week that shattered 14-to-154-year temperature records across NYC, DC, and Atlantic City simultaneously, marking the most intense East Coast heat event in over a century [2].

Historically, July highs in NYC typically range between 85°F and 95°F, but the recent surge pushes the odds toward the upper end. On Polymarket, the frontrunner outcome is 92–93°F at 35%, while 87°F or below sits at 18% [1]. This contrasts with Kalshi’s decimal odds format, which would express the same 62% as 1.61, and Betfair’s spread-based pricing, where liquidity and fees diverge notably from Polymarket’s zero-KYC, flat-fee model. Smarkets’ lower fee structure may attract volume from traders comparing book efficiency on this weather event.

Traders should monitor the National Weather Service’s daily high-temperature forecasts and Wunderground’s real-time LaGuardia readings, the official resolution source. Any sudden shift in cloud cover or wind patterns could alter the peak temperature before the 12:00 UTC settlement window. With the heatwave already active, the dependency on atmospheric stability remains the key catalyst for this market’s outcome.

Sources: 1 · 2

Methodology

This page compares Highest temperature in NYC on July 16? 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

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.

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.