Highest temperature in NYC on August 17?

Platform comparison

Market context

The market concerns the highest temperature recorded at LaGuardia Airport on 17 August 2026, with settlement based on Weather Underground's Daily Observations table rather than summary figures. The 1% implied probability reflects expectations of relatively moderate conditions for mid-August in New York City, where peak summer heat typically occurs in late July and early August.

Historical August temperatures at LaGuardia show considerable variation. Since 1950, the station has recorded August highs ranging from 67°F to 99°F, with an average high around 82°F. The 17th falls in the latter half of the month when heat waves are less frequent than in early August, though not impossible. Only twice in the past seventy years has LaGuardia recorded a temperature of 95°F or higher in mid-to-late August, suggesting extreme heat on this specific date remains genuinely uncommon. The current probability assignment appears calibrated to this historical distribution.

Traders should monitor seasonal weather patterns as August 2026 approaches. The National Weather Service's extended forecasts, typically issued 8–14 days ahead, will provide the most reliable indicator of whether anomalous heat is developing. Atlantic hurricane activity and upper-level atmospheric patterns in mid-August can influence whether tropical moisture or continental heat dominates the Northeast. Any significant heat dome or blocking high-pressure system forecast for that week would be the primary catalyst for probability movement. Real-time meteorological data from late July 2026 onwards will be essential for assessing whether conditions are tracking toward the tail end of the historical distribution.

Methodology

This page tracks Highest temperature in NYC on August 17? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Trump Prediction provide a 0%-fee route into the same order book.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

UK Frequently Asked Questions

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Are UK election prediction markets available from the UK?

Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.