Highest temperature in Paris on July 4?

Platform comparison

Market context

The underlying event is whether Paris-Le Bourget will record a temperature within the highest possible range on 4 July 2026, a threshold currently deemed impossible by the crowd. Historical data frames this near-zero probability with stark realism: while Paris averages July highs of 26°C, the range of daily highs spans 20°C to 43°C, with the record 43°C set in 2019 during a severe heatwave. Recent extremes reinforce this volatility; France recorded its hottest day ever at 45.9°C in Gallargues-le-Montueux just weeks ago, and a red heatwave alert now covers 54 departments as temperatures persist around the clock, suggesting the atmosphere is primed for record-breaking conditions rather than the calm implied by current odds.

Traders must watch for imminent meteorological declarations and scheduled heatwave updates from Meteo France, which has already flagged persistent high temperatures across western Europe. The market is leaning heavily on the catalyst of an impending heatwave intensification, as evidenced by the red alert status and the closure of the Eiffel Tower early during the recent peak. With the settlement window ending 12:00 UTC on 4 July, any sudden spike in temperature forecasts or official heatwave declarations from the national meteorological service will be the decisive factor. Recent news from NBC News confirms that Europe is suffering a brutal heatwave, making the current 0% probability a potential mispricing if the heatwave extends to Paris by the settlement date.

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 Paris on July 4? 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

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

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.

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.