Highest temperature in NYC on July 27?

Platform comparison

Market context

New York City's weather on 27 July 2026 will be recorded at LaGuardia Airport, with the day's peak temperature determining which range resolves as correct. The settlement uses Wunderground's historical data archive, which captures hourly readings throughout the day. This market structure differs notably across platforms: Polymarket and Kalshi both offer binary or range-based contracts on US weather events, though Kalshi's weather markets typically settle against NOAA data rather than Wunderground, creating potential basis risk for traders comparing books. Smarkets and Betfair offer similar weather contracts but with varying decimal-odds displays and fee structures that affect true implied probabilities.

July temperatures at LaGuardia historically range from 75°F to 88°F, with the 30-year average high around 82°F. The 0% crowd probability currently assigned suggests either extreme confidence in a specific temperature band or insufficient liquidity across all ranges. Comparable July days in recent years—2023 and 2024—saw highs between 79°F and 86°F, providing a baseline for assessing whether current odds reflect realistic seasonal patterns or market inefficiency.

The National Weather Service issues extended forecasts approximately ten days ahead; traders should monitor updates from mid-July onwards for any unusual atmospheric patterns. Tropical systems or heat domes affecting the Northeast in late July could shift probabilities materially. Kalshi's KYC requirements differ from Polymarket's, affecting which traders can access this contract, whilst fee structures on Smarkets and Betfair may compress margins differently depending on the temperature range selected.

Methodology

This page compares Highest temperature in NYC on July 27? 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

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

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.

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.