Highest temperature in Paris on August 4?

Platform comparison

Market context

Paris is facing the day through the lens of a temperature market that will be settled against the Paris-Le Bourget Airport Station, so the key question is whether the afternoon peak lands in the low 30s °C or slips back towards the upper 20s. The crowd is currently assigning 0% to YES, but the live market screen shows the heaviest pricing clustered around **31°C** and **32°C**, with those two outcomes far ahead of the rest[3].

That pricing should be read against the fact that Paris in August usually sits much lower than midsummer heatwave extremes, with typical highs around the mid-20s °C in seasonal guides and monthly outlooks[1][8][14]. The main historical comparables are recent French heatwaves, which show how quickly temperatures can overshoot norms: Reuters reported France’s June 2026 heatwave breaking national heat records, while *Le Monde* said the country was heading into a fourth heatwave of the year in late July[7][18]. In that context, a low-30s finish is not a routine August outcome, but it is also well short of the exceptional 40°C-plus episodes seen earlier in the summer[7][17][18].

For traders, the catalyst is not a political event at all but the day’s forecast evolution and any short-term model shifts before the settlement window closes. AccuWeather and WeatherSpark both point to August temperatures for Paris that generally centre below the market’s front-runners, which helps explain why the book is pricing a modest range rather than a heatwave spike[1][2]. The practical dependency is whether cloud cover, rain bands, or a delayed afternoon maximum cap the reading at Le Bourget; if the hottest part of the day comes earlier or later than expected, the final Celsius bracket can move quickly as the station’s highest recorded temperature is updated on Wunderground[3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Paris on August 4? 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 Election Predictions UK 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.

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.

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.