Highest temperature in NYC on August 2?

Platform comparison

Market context

LaGuardia’s daily high for 2 August will be set by the warmest observation on the station’s Wunderground history page, so the main question is whether the airport peaks in the low 80s, mid 80s, or clears 90°F. Polymarket’s page for this event shows the crowd already clustering around the low-to-mid 80s and pricing “82-83°F” and “84-85°F” near the top of the board, while the current implied probability for any YES outcome is shown as 0% on your feed, which makes this look like a stale or mis-specified starting point rather than a live consensus signal.[5][3]

For historical framing, New York has recently seen severe heat, including a 100°F reading at Central Park during the July 2026 heat wave, which Bloomberg and the New York Times said was the city’s hottest day in years.[9][7] That matters because airport highs can run differently from park readings: LaGuardia sits in a more open, coastal setting, and the market settlement source is a specific station rather than “NYC” in general, so traders comparing Polymarket with Kalshi, Betfair or Smarkets should be careful about venue rules and contract wording. Polymarket shows prices as percentages, while exchange-style books typically surface decimal odds and charge differently through spread, commission or fees; access and KYC also vary by platform and jurisdiction, which can affect who is able to trade this exact weather contract.[5]

The main catalysts before settlement are the afternoon temperature trend, any last-minute cloud cover or sea-breeze shift, and whether thunderstorms cap the high before the daily maximum is printed on Wunderground. Official weather products and local reporting can help infer the shape of the day, but the contract settles on the recorded station high, not on forecasts, feels-like readings, or citywide averages.[18][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in NYC on August 2? 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

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. 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.

Which platform supports Klarna/SOFORT?

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