Highest temperature in Paris on August 3?

Platform comparison

Market context

Paris airport’s top temperature on 3 August is a **weather lottery** rather than a high-conviction favourite, with the market implying just **1% YES**. That leaves the consensus firmly on the *no* side: for a daily maximum to land in the relevant range, conditions would usually need an organised hot spell or a sharp forecast error, and Paris in August is more often moderated by Atlantic influence than locked into extreme heat. Typical August highs in Paris are around the mid-20s Celsius, which makes any very high threshold look like a long-shot under normal seasonal patterns.[1][7][15][16]

The historical frame matters because this market settles on the **single highest reading** at Paris-Le Bourget Airport on one day, so a transient late-afternoon spike can matter more than the day’s average. Recent 2026 reporting shows France has already been hit by severe heatwave conditions this summer, with Paris reaching nearly 41°C during the June event and red alerts issued across parts of the country; that is the main contrarian angle against the 1% pricing, because it proves the atmosphere has already supported extreme outcomes this season.[6][9][10][19] For handicappers, the favourite remains *no* unless the threshold is modest; the only real value on *yes* would come if the market is underreacting to another late-summer heat surge.

The key catalysts are the short-range forecast and any new heat advisories for Île-de-France before the settlement window closes, because Paris heat risk can change quickly with cloud cover, wind direction and the position of a warm air mass. Traders should watch the late-night and morning updates for 3 August from mainstream forecast providers and official French alerts, since a clear run of sun plus a southerly flow can lift the day’s maximum materially, while showers or marine air would cap it well below extreme ranges.[1][18][16] In other words, this is a classic *underdog* setup: the crowd is priced for a coolish outcome, and the value case only improves if the synoptic picture turns hotter than the usual August baseline.[2][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win 2026, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.