Highest temperature in Paris on July 26?

Platform comparison

Market context

Paris is being scored on the day’s **highest temperature** at Paris-Le Bourget Airport, with the market currently implying **0% YES**. That makes the favourite the *no/other-range* side by a wide margin, and the only obvious value angle is contrarian: a trader would need evidence of an outsized heat spike relative to a normal Paris July, rather than merely a warm afternoon. July in Paris is typically the warmest month of the year, with average highs around **27°C** and lows around **16°C**, so the market’s setup is still about the tail of the distribution rather than the centre of it.[2][3]

On comparable summer conditions, Paris can reach the low-to-mid 30s in heat spells, but the usual run-rate is well below the sort of extreme needed to threaten the upper bands of many temperature markets.[3][7] Recent coverage has described heatwave conditions in France with forecasts of highs in the **mid-30s** and local thunderstorms later in the system, but also notes that temperatures can fall sharply once the heat breaks, with Météo-France saying “we will lose around **15°C** generally”.[1][5] That keeps the consensus anchored to the downside for any very hot outcome, while leaving the contrarian case dependent on how long the heat holds through the daytime maximum.

For traders, the main catalyst is the actual Paris-Le Bourget reading through the afternoon local time window, because the settlement source is the station’s daily history page rather than a citywide average. The key dependency is whether any lingering heat dome or late-afternoon clearing allows the day’s maximum to print before cooler Atlantic air or thunderstorms arrive; weather commentary has also pointed to a drop-back below **30°C** once the hot spell weakens.[1][6] In practice, consensus looks priced for a fairly ordinary or only moderately warm outcome, while the value spot sits only with a late, sharper-than-expected spike that pushes the station reading into the hotter tail.[1][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on July 26? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win 2026, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.