Highest temperature in Miami on August 25?

Platform comparison

Market context

Miami was running hot on 25 August, with the National Weather Service pointing to a high near 91F at Miami International Airport and an afternoon pattern of mostly sunny skies, scattered thunderstorms, and heat index values as high as 106F. The NOAA hourly feed already showed temperatures in the low 80s early in the day, with the day’s maximum still dependent on whether the strongest heating arrived before cloud and storm cover built in.

Historically, late-August Miami readings tend to cluster in the upper 80s to low 90s, so the key read-through is not whether it gets warm, but whether the airport gets a brief spike above forecast before convection clamps down. That leaves the market leaning on the usual South Florida summer script: intense surface heating, sea-breeze boundaries, and short-lived storms rather than a clean all-day climb.

For traders, the catalyst is the timing of the afternoon shower and thunderstorm cycle, not any scheduled political event. The forecast discussion from the Miami forecast office flagged ridging, easterly to southeasterly flow, and peak afternoon temperatures in the low to mid 90s, with showers most likely later in the day; if that timing holds, the highest hourly NOAA reading should be set before widespread rainfall cools the surface. Recent Reuters polling on Trump’s approval and other election headlines may keep wider political markets active, but for this contract the only real dependency is the NOAA hourly data at Miami International Airport.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Miami on August 25? 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.