Highest temperature in Paris on August 9?

Platform comparison

Market context

Paris is moving into a hot August spell, but the market is about the single highest reading at Le Bourget rather than the broader city forecast. That distinction matters because airport stations can run a little differently from central Paris, and the settlement source will key off the *Daily Observations* table on Weather Underground rather than the summary high/low figure.

The 1% implied probability for the top outcome signals that traders are still treating an extreme reading as unlikely, even after a summer in which France has repeatedly faced heatwave conditions. Reuters reported in June that the French weather agency was warning of record-high temperatures, while *Le Monde* said in late July that the country was heading into its fourth heatwave of the year, framing this market as one where elevated heat is already priced into expectations but not in an exceptional range.[18][19] Comparable Paris temperature markets on prediction platforms have also tended to cluster around the most ordinary outcome available when the forecast stays near seasonal norms, which is the current reference point for reading a low single-digit price.

The main catalyst to watch is the short-range forecast into the settlement window, especially any late forecast shift towards stronger sunshine, weaker cloud cover, or drier air, because those can push the day’s peak up by a few degrees. Current commercial forecasts are mixed but not extreme: AccuWeather shows Paris on 9 August with a high around 34°C, while Time and Date’s forecast is closer to 32°C with showers later, and Sortiraparis described the weekend of 8–9 August as potentially hotter and largely sunny.[1][10][12] If that warmer guidance holds, the market’s relevant question is not whether Paris gets warm, but whether Le Bourget can print a late-day spike high enough to land in a higher Celsius band before the 12:00Z settlement cut-off.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Paris on August 9? 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

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.

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.

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.