Highest temperature in Paris on July 20?

Platform comparison

Market context

Paris is entering a confirmed heatwave as mid-July 2026, with temperatures already surging into the low-to-mid 30s and forecasts pointing to peaks between 36°C and 40°C over several consecutive days[3][4]. The current 0% crowd-implied probability for any outcome above the lowest range contradicts this active meteorological reality, where Météo-France has flagged a possible orange or red heat alert that could persist beyond 14 July[3][6]. Historical data shows July is Paris’s hottest month, with average highs of 25–27°C but frequent canicules pushing temperatures to 35–40°C, especially in mid-July[2]. The market’s frontrunner outcome of 24°C at 100% probability appears misaligned with both current forecasts and seasonal extremes, suggesting a pricing error rather than a rational assessment of risk[1].

Traders should monitor daily Météo-France heat alerts and Wunderground’s real-time readings for Paris-Le Bourget Airport, the designated resolution source, as the heatwave is expected to last several days with no immediate end in sight[3][6]. The primary catalyst is the continuation of this intense spell, which some forecasts predict could briefly reach or exceed 40°C—a level Paris has only recorded a few times historically[4]. With cooler Atlantic air only expected by the end of the week, the window for extreme temperatures on 20 July remains open, making the current 0% probability for higher ranges increasingly untenable as the event approaches.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Paris on July 20? 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.

FAQ

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

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.

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.