Highest temperature in Paris on June 26?

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Market context

On 26 June 2026, Paris faces the tail end of a historic heatwave that pushed temperatures near 40°C through Thursday, with cooling expected to begin gradually on Friday but potentially interrupted by weekend storms [4]. The prediction market currently assigns a 0% probability to the "YES" outcome for any temperature range, yet Polymarket traders are heavily betting on 36°C as the leading outcome at 68%, followed by 37°C at 28%, creating a stark divergence between the implied probability and the crowd-implied odds [1].

Historically, June in Paris is mild, with average highs between 20°C and 24°C, but this year’s extreme plateau has reset expectations, making 36°C or 37°C plausible despite the typical climate [3][9]. The cooling trend announced for Friday may not fully materialise before the settlement window closes, and the risk of isolated storms could trap heat, keeping temperatures elevated through the day [4]. Traders should monitor Météo-France’s hourly updates for Friday evening and Saturday morning, as any delay in the cooling could sustain the heatwave, while storm activity might either break the heat or trap it depending on wind patterns [4].

Recent reports confirm Thursday 25 June as France’s hottest day ever, with peaks exceeding 40°C, underscoring the severity of the current event [6]. The settlement window ends at 12:00 UTC on 26 June, meaning traders must watch for real-time Wunderground data for Paris-Le Bourget Airport Station, as the market resolves on the highest temperature recorded for all times on that day [1]. The divergence between the 0% implied probability and the 68% crowd-implied odds on 36°C suggests a significant mispricing, likely driven by traders anticipating that the cooling trend will be slower than forecasted.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.