Highest temperature in Paris on July 16?

Platform comparison

Market context

Paris-Le Bourget faces a scorching mid-July day on 16 July 2026, with the market heavily favouring a peak of 33°C. The crowd-implied probability for any outcome deviating significantly from this range sits at 0% YES, reflecting a consensus that extreme heat is the baseline expectation rather than an outlier. Historical data for Paris in mid-July often sees temperatures hovering between 28°C and 34°C, making 33°C a statistically probable ceiling rather than a speculative spike. The 57% weighting on 33°C suggests traders view this as the favourite, while 32°C acts as the underdog at 29%, leaving little room for contrarian value unless a sudden cooling front disrupts the forecast.

Traders should monitor real-time meteorological updates from Météo-France and Wunderground, the designated resolution source, as cloud cover and wind patterns from the Atlantic could act as the primary catalysts for deviation. Recent weather models for the region indicate a high-pressure system dominating western Europe, which typically suppresses rainfall and amplifies daytime heating [1]. If the pressure system weakens unexpectedly before noon UTC, temperatures could dip toward 31°C, creating a potential value spot for the underdog. Conversely, sustained high pressure with minimal wind will likely lock in the 33°C outcome, rendering the market efficient and limiting arbitrage opportunities for late entrants.

Sources: 1

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.