Highest temperature in NYC on July 30?

Platform comparison

Market context

The relevant event is the **highest temperature at LaGuardia Airport on 30 July 2026**, and the current 0% YES price implies the market is treating a very low outcome as the base case. That looks directionally consistent with the broader July pattern in New York City, where late-month highs are often well below heatwave levels; AccuWeather’s New York monthly view shows 30 July at about **87°F** with nearby days in the upper 80s, while weather-history sites place late-July highs in the city mostly in the 80s rather than near record territory.[1][4][5]

For historical framing, LaGuardia’s benchmark heat is not especially close to the region’s all-time extremes: forum-aggregated airport climate references list **LGA’s all-time high at 97°F**, with nearby airports showing higher but still limited maxima, such as **JFK 104°F** and **Newark 108°F**.[12] That matters on a platform-comparison basis because Polymarket-style markets quote **implied probability** directly, while Betfair and Smarkets normally express the same view through **decimal odds** and a commission layer, so a “0%” reading can look more absolute than it would on an exchange order book. Kalshi’s contracts are also U.S.-regulated and KYC-gated, whereas access and fee treatment differ across exchanges, which affects who can actually take the other side and how much edge is left after costs.

The main catalysts are weather-model updates and any late-summer pattern shift over the Northeast: a ridge bringing hotter air, a passing front, or afternoon cloud and rain can move the day’s maximum materially. In late June and early July, New York did see a major heat episode with temperatures reaching **100°F** and widespread heat-wave coverage, showing how quickly the market can reprice if synoptic conditions turn favourable for extreme heat.[10][13][15] For this specific contract, the key trader watchpoint is not the overnight low but whether midday heating at LaGuardia can exceed the upper-80s consensus and push into the 90s before the settlement window closes at noon UTC.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in NYC on July 30? 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 Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

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.

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.

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.