Highest temperature in NYC on July 7?

Platform comparison

Market context

On 7 July 2026, New York City faces a critical weather threshold as traders assess whether the highest temperature at LaGuardia Airport will exceed 74–75°F, a range currently implied at just 4% probability. This market resolves based on the peak Fahrenheit reading recorded at LaGuardia, sourced from Wunderground, with settlement ending at 12:00 UTC on the day itself. The event hinges on whether a lingering heatwave, similar to the one that pushed LaGuardia to 102°F in a recent July record, will recur or if typical July highs of 81–99°F will dominate.

Historical data frames this low probability: while LaGuardia hit 104°F in early July 2026 and recorded its warmest midnight at 94°F, such extremes are outliers. The average July high sits between 81°F and 99°F, with overnight lows of 68–83°F, making a 74–75°F peak unusually modest unless a cooling trend intervenes. Recent heatwaves, including one where Newark reached 105°F, suggest volatility, yet the 4% YES implies markets expect temperatures to stay well above this narrow band, not dip into it.

Traders should monitor the National Weather Service’s heatwave advisories and AAA’s travel forecasts, as extreme heat often correlates with disrupted holiday travel and elevated energy demand. A recent Fox Weather report confirmed LaGuardia’s 102°F spike and 94°F midnight record, underscoring the region’s susceptibility to sudden surges. On platforms like Polymarket versus Kalshi, divergence appears in odds presentation—decimal odds versus implied probability—and fee structures, with Kalshi requiring KYC while Polymarket offers broader access. These differences shape liquidity and pricing efficiency for this specific temperature contract.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in NYC on July 7? 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 UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

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.

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK 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.