Highest temperature in NYC on July 14?

Platform comparison

Market context

New York City is tracking the peak Fahrenheit reading at LaGuardia Airport for 14 July 2026, with settlement tied to Wunderground’s daily high. The crowd currently assigns 0% probability to any outcome, a stark divergence from Polymarket’s active book where “96–97°F” leads at 54% and “94–95°F” follows at 32%[1]. This discrepancy highlights how platforms frame risk differently: Polymarket displays implied probabilities directly, while Kalshi, Betfair, and Smarkets typically quote decimal odds, requiring traders to convert between formats to assess value. Fee structures and KYC thresholds also vary, with Polymarket often permitting non-KYC access compared to the stricter identity checks on regulated exchanges.

Historical heat waves in July frame the 0% stance as likely mispriced. LaGuardia recorded 94°F at midnight on a recent East Coast surge, breaking a 2013 record of 93°F[2]. The July 2026 heatwave simultaneously shattered records across a 500-mile corridor, with NYC, DC, and Atlantic City all exceeding long-standing highs for 14–154 years[4]. Such extremes suggest temperatures in the 94–97°F range are plausible, making the zero-probability line on some books an outlier against empirical precedent.

Traders should monitor the National Weather Service’s daily LaGuardia summaries and Wunderground’s real-time updates as the settlement window closes at 12:00 UTC on 14 July 2026[3]. No specific announcements are pending, but the dependency rests entirely on the official station reading. Divergence between platforms may persist if one book adjusts to recent heat data while others lag, creating arbitrage opportunities for those comparing implied probabilities against decimal odds across exchanges.

Sources: 1 · 2 · 3 · 4

Methodology

We read Highest temperature in NYC on July 14? 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

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.

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.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.