Highest temperature in London on July 24?

Platform comparison

Market context

London is starting the day with a much cooler set-up than the recent early-July heat, which helps explain why the market is currently priced at 0% for a very hot outcome. The latest July forecast for London points to a far more typical summer day, with temperatures around the low 20s Celsius rather than anything near heatwave levels, and rainfall remains in the picture. [3][6]

That matters because London’s July climate usually centres on daytime highs of about 22–23°C, not extreme peaks, so a top-end reading at London City Airport needs a meaningful deviation from normal weather. The city did briefly see much hotter conditions earlier in the month, including 34°C in London during the July heatwave, but the current pattern looks closer to seasonal rather than exceptional conditions. [2][6][8]

The main catalysts to watch are the short-range temperature forecast, cloud cover and any shift in wind or rain timing, because these drive the daily maximum at London City Airport before the midday settlement window closes. If the forecast trend holds at the cooler end, the market’s 0% implied chance should remain justified; if a warm surge develops, the upper temperature bands could quickly become more relevant. [3][5][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on July 24? 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

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

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 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.