Highest temperature in NYC on August 8?

Platform comparison

Market context

The event is whether LaGuardia Airport’s recorded high on 8 August 2026 falls into the market’s chosen Fahrenheit band, using Weather Underground’s **Daily Observations** table rather than the summary high/low panel. On Polymarket, the venue makes the source and station explicit and the market price is shown as an implied probability; on Robinhood the same event is framed as a prediction market event page, while on platforms such as Kalshi, Betfair or Smarkets you typically compare listed prices through their own contract or decimal-odds interfaces, with different fee treatment and KYC access depending on jurisdiction and product.

For context, New York’s August highs commonly sit in the mid-to-upper 80s Fahrenheit, and the official climate note for Central Park shows an August 8 normal maximum of 84°F, with yesterday’s observed maximum at 91°F[5]. That makes a 90°F-plus outcome plausible in a warm spell, but the crowd has already priced the event as essentially certain at the top band, with Polymarket showing 90–91°F at 100% implied probability and the other outcomes at 0%[3]. The way to read that across books is that the same view can appear as a binary contract near the ceiling on one venue, while on an exchange-style book the equivalent may show as a very short price after fees rather than a clean percentage.

The main catalysts are simple: the day’s actual station observations, any late corrections to the LaGuardia history feed, and whether thunderstorms, sea-breeze shifts or a post-peak temperature dip alter the final daily maximum before the next day’s first datapoint is published[3]. As of the latest available daily climate report, New York had already logged a 91°F maximum yesterday, which confirms the air mass was capable of reaching the upper 80s or low 90s in the area[5]. Traders comparing platforms should also note that some books settle on the official source only after publication windows close, so the timing of updates matters as much as the raw peak.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in NYC on August 8? 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.

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. Robinhood Prediction Markets 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. 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.