Highest temperature in Paris on July 27?

Platform comparison

Market context

Polymarket is pricing Paris’s airport high for 27 July at a **0%** YES chance, even though the contract settles on the highest reading at Paris-Le Bourget Airport Station in Celsius and pays out in USDC on Polygon via conditional tokens. For a trader, that makes the live book look like an extreme longshot, with the market implying essentially no expectation of a top-end summer spike above the listed ranges.

That reading sits against a fairly ordinary July climate base: third-party Paris July summaries point to average highs around **25°C** and lows near **16°C**, with rain spread across roughly **18 days** in the month.[1][3] On Polymarket’s own event page, the current cluster is concentrated around the middle of the range, with **27°C** leading and **28°C** close behind, which is consistent with a warm but not exceptional day rather than a breakout heat event.[2] For a user holding conditional tokens, the main question is not whether Paris is warm in July, but whether the airport station posts a one-off maximum that jumps into the upper tail of the distribution.

The catalysts to watch are the day’s actual weather evolution at Le Bourget: morning cloud cover, afternoon sunshine, wind, and any short-lived convective showers can all shift the final maximum by a degree or two. Traders also need to remember that the market resolves off Wunderground’s daily history page for the station, so the relevant dependency is the recorded peak there, not headline city forecasts. By 10:48 UTC, the final few hours of daytime heating are what matter most, and any updated local forecast or heat warning that materially raises expected afternoon maxima would be the main route for a repricing.

Sources: 1 · 2 · 3 · 4

Methodology

This page reviews Highest temperature in Paris on July 27? 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 Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees.

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.

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.