Highest temperature in NYC on August 8?

Platform comparison

Market context

The underlying event is the **highest official temperature at LaGuardia Airport** on 8 August, as recorded in Weather Underground’s Daily Observations table, not the summary high shown elsewhere on the page. That matters because this contract resolves to a specific Fahrenheit band, so the trader is not pricing “what New York felt like” in general, but the station reading that eventually lands in the relevant range on the observation feed.[3][10]

Historically, August temperatures in New York City often sit in the 80s, with the National Weather Service listing an 84°F normal maximum for 8 August at Central Park and yesterday’s maximum at 91°F in the daily climate report, which shows how quickly the city can move from near-normal to very warm in midsummer.[5] On Polymarket, the market is quoted as an implied probability, while Betfair and Smarkets usually present decimal-style prices and spreads, so the same weather outlook can look more or less “certain” depending on the book’s format and fee structure; KYC reach also varies by venue, with access and eligibility differing by jurisdiction.[3]

For trading context, the key catalyst is whether late-afternoon convection or a marine breeze trims the peak temperature before the day closes, since the settlement source is the day’s highest observed reading rather than an averaged figure or forecast high. At 20:26 UTC on 8 August, WeatherSpark still showed KLGA at 89.1°F, and the NWS update for New York City later that evening showed 79°F at Central Park, suggesting a warm but potentially capped finish rather than a dramatic late surge.[2][6] The market’s 0% YES crowd price implies participants already expect the final observed high to sit outside the YES band, which is consistent with a platform where late prints and source-specific definitions can matter more than headline forecast summaries.[3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in NYC on August 8? 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

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.

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.

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.