Highest temperature in NYC on July 23?

Platform comparison

Market context

New York City’s highest temperature on 23 July 2026 will be set by the LaGuardia Airport reading that Wunderground uses for settlement, so the trade is really about the day’s peak airport heat rather than the citywide headline temperature. On Polymarket, the current frontrunner is 80-81°F at 72%, with 82-83°F the next most likely bucket at 19%.[1]

That profile looks materially warmer than the market’s own zero-priced “YES” framing suggests, and it is also the sort of summer distribution that tends to cluster around adjacent bins rather than spread evenly across the range. On venues such as Polymarket, the quote is shown as an implied probability; on Kalshi and some other regulated books, the same event is usually presented as a contract price, while Betfair and Smarkets more often surface decimal odds and layer on exchange-style commission rather than embedded market-maker spreads. The practical difference on a single temperature market is that identical views can look cheaper or pricier depending on whether fees are charged upfront, on winnings, or via the bid-offer spread, and KYC access is typically broader on the exchange-style venues than on crypto-native markets.[1]

The main catalyst is the afternoon forecast for LaGuardia, especially any revisions from the National Weather Service, which can quickly move expectation of whether the day peaks in the low 80s or slips back into the upper 70s. Traders should also watch for any heat advisory, sea-breeze shift, cloud cover, or thunderstorm timing that can cap the maximum before the settlement window closes at 12:00 UTC, which is still morning in New York and means the contract only cares about the local daily high, not any later-evening weather.

Sources: 1

Methodology

We read Highest temperature in NYC on July 23? 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

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

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.

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 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.