Highest temperature in Miami on August 5?

Platform comparison

Market context

Miami’s temperature on 5 August will be set by the day’s peak reading at Miami International Airport, with the crowd currently pricing the market as a near-certain **0% YES**. That is not a forecast of a cold day so much as a sign that the quoted range is being treated as effectively settled against the event structure, which resolves off the airport station’s highest recorded Fahrenheit value rather than a citywide average. August in Miami is normally one of the hottest parts of the year, with late-summer highs around the upper 80s to near 90°F in the monthly outlooks, so the natural weather framing is straightforward even if the market odds are not.[1][17]

Historical context points to a narrow band around the high 80s. AccuWeather’s August outlook for Miami shows highs of 87°F on 4 August, 89°F on 5 August and 89°F on 6 August, while Miami’s long-run August climate profile clusters around hot, humid afternoons rather than large swings.[1][17] Wunderground’s Miami history page also places the airport station in the low 80s in the observed history view, reinforcing that the settlement source is a single official-style station reading rather than broader metro conditions.[9] In comparable August heat, the market is usually driven by whether the afternoon reaches the upper 80s or nudges towards 90°F, not by any extreme outlier.

For traders, the key catalyst is the day-of forecast and whether late-day showers, cloud cover, or sea-breeze timing cap the airport’s afternoon maximum. CBS News Miami said on 5 August that a “hot and humid afternoon” was expected, with a high around 90°F, which matches the broad summer baseline and the kind of forecast that typically keeps these temperature markets tightly clustered near a single range.[4] The main dependency is therefore not a political or campaign calendar, but the short-horizon weather call: if the airport reaches the upper 80s or touches 90°F before clouds build, the highest-temperature band will be determined by that brief peak.[4][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Miami on August 5? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

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.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

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.