Highest temperature in Paris on July 23?

Platform comparison

Market context

Paris has moved back towards *ordinary summer warmth* after the very hot spells seen earlier in the month, and the latest local forecasts now point to highs in the high 20s Celsius rather than anything extreme. That matters for this market because the settlement source is the day’s **highest** temperature at Paris-Le Bourget Airport, so even a modestly warm afternoon is enough to clear the lower bands while still leaving the upper outcomes dependent on a fresh surge of heat. [8][1]

The probability picture is shaped by how July usually behaves in Paris: long-run daytime highs are generally around the mid-20s Celsius, with a typical range that sits well below heatwave territory. Recent forecasting for July 2026 has also leaned warmer than average overall, but not uniformly so, which helps explain why the market is still anchored near the lower temperature bands rather than pricing a meaningful chance of a very hot finish. [6][4][7]

For traders, the key catalysts are the late-day temperature trend, any updated local forecast from the next model runs, and whether cloud cover or a passing shower suppresses the afternoon peak. The latest available report around mid-afternoon showed 73°F at Paris with dry conditions and moderate wind, which supports a warm but not especially hot outcome unless temperatures recovered later in the day. The market is effectively dependent on whether Paris-Le Bourget sees a stronger late-afternoon rise than the broader city forecast suggested. [2][8]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on July 23? 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 Prediction Today, 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

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.

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 Prediction Today trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.