Highest temperature in NYC on July 10?

Platform comparison

Market context

New York City is experiencing an unprecedented July 2026 heatwave, with LaGuardia Airport recording 104°F on 3 July, shattering a 60-year record. The settlement window for the 10 July high closes at noon UTC, yet the current crowd-implied probability of any specific outcome sits at 0% YES, suggesting traders view the event as either already determined or outside the defined resolution ranges. This extreme volatility contrasts sharply with Kalshi’s climate contracts, which typically offer decimal odds with tighter spreads, whereas Polymarket’s implied probability model here reflects a fragmented liquidity pool where no single range commands confidence.

Historical precedents from the same heatwave show LaGuardia hitting 102°F on 9 July and 94°F at midnight on 10 July, indicating residual heat but a likely drop from the 104°F peak. Comparable cases from 1966, when LaGuardia reached 107°F, frame the upper bound, yet the current 0% probability implies the market expects temperatures to fall below the lowest offered range. Smarkets and Betfair, which charge lower fees and require less stringent KYC than Polymarket, often show divergent pricing on such weather events due to their global trader base, whereas Polymarket’s US-centric liquidity may be underweighting the persistence of this specific atmospheric ridge.

Traders should monitor the National Weather Service’s hourly updates for LaGuardia and the overnight low trends, as a low of 80°F could sustain daytime highs near 100°F. FOX Weather reported the record-breaking midnight warmth on 10 July, confirming the heat’s persistence, but no official announcement has yet confirmed the 10 July peak. The market’s divergence from Kalshi’s more structured climate offerings highlights how platform mechanics—decimal odds versus implied probability—shape price discovery on volatile weather events, with fee structures and KYC reach further influencing where liquidity concentrates.

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Methodology

This page compares Highest temperature in NYC on July 10? 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 Robinhood Prediction Markets, 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 supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.