Highest temperature in London on July 16?

Platform comparison

Market context

London City Airport is currently recording 13°C with southerly winds and high humidity, a stark contrast to the scorching conditions implied by the zero per cent crowd-implied probability for any higher temperature outcome on this specific date. The market, which settles at noon UTC on 16 July 2026, has effectively priced in a cool day, diverging sharply from historical mid-July norms where London frequently exceeds 20°C.

Historical data from comparable mid-July periods in London shows temperatures regularly climbing into the 20s, with records often reaching 30°C or higher during heatwaves, suggesting the current 0% probability for elevated ranges may reflect an anomaly rather than a statistical certainty. Previous years have seen July 16 temperatures land in the 24–28°C range, making the market’s current stance on a sub-15°C day an outlier against the broader climatological trend for this location.

Traders should monitor the Met Office’s daily forecast updates and Wunderground’s real-time hourly logs for the EGLC station, as any sudden shift in cloud cover or wind direction could invalidate the current pricing. Recent weather bulletins from the BBC indicate falling pressure and moderate visibility, which often precede cooler, unstable conditions, yet a rapid change in the southerly flow could introduce unexpected warmth before the settlement window closes.

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Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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

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