Highest temperature in Paris on August 3?

Platform comparison

Market context

Paris’s highest temperature on 3 August will depend on the warmest reading logged at Paris-Le Bourget Airport by midday UTC, so traders need to think in terms of a single daily max rather than a close or average. On long-run August climatology, Paris usually tops out in the low-to-mid 20s Celsius, with typical August daytime highs around 23–25°C, which makes a sub-1% market probability consistent with a normal summer day rather than a heat extreme.[4][13][18]

The right historical lens is that Paris can spike sharply during French heatwaves, but those are episodic rather than routine. In June 2026, Paris was reported above 40°C during a severe European heat event, including a city reading of 40.9°C, while broader coverage noted consecutive days above 40°C in the capital and the wider French heatwave context.[5][8][11][16][19] For a programmatic trader, that means the key edge is not the season alone but whether synoptic patterns, heat advisories, or a southerly air mass are in place in the 24–72 hours before the settlement window.

The practical catalysts to watch are the short-range forecast updates and any French heat alerts, because those can move the implied range materially even when the market looks “obviously” low. A bot or copy-trading setup would typically pull hourly forecast maxima, compare them with the Wunderground station feed used for settlement, and adjust for airport-specific reporting risk rather than city-centre observations. The market is especially sensitive to forecast revisions overnight and early on 3 August, when model convergence on cloud cover, wind direction, and overnight minima will determine whether the day can even threaten the 30°C band.[1][2][4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Paris on August 3? 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 Bot UK, 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

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.

Do I need to KYC for this market?

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