Highest temperature in Paris on July 23?

Platform comparison

Market context

The underlying event is the hottest reading at Paris-Le Bourget Airport on 23 July, with the market settling on whichever Celsius band contains that day’s peak temperature. The current crowd-implied price is 0% for YES, while the live market page shows 25°C as the frontrunner outcome, effectively pricing that band as the expected result. [1]

For context, Paris in July typically sits in the mid-20s Celsius, and recent July-oriented forecast pages for the city point to highs around 26°C, with a warmer-than-usual month still compatible with ordinary summer variation rather than an extreme spike. That makes a mid-20s settlement more consistent with seasonal norms than the upper bands, unless a late-day heat burst pushes the airport reading higher than forecast. [2][3]

The main catalyst to watch is the weather setup for the rest of the day, especially any short-lived convection, cloud breaks, or a stronger afternoon warm-up that could lift the airport’s maximum before the settlement window closes. With the market already leaning on a 25°C print, traders should focus on the final official Wunderground history entry for Paris-Le Bourget and any late meteorological updates rather than earlier daytime readings. [1][2]

Sources: 1 · 2 · 3

Methodology

This page tracks Highest temperature in Paris on July 23? 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

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

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.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.