Highest temperature in London on July 15?

Platform comparison

Market context

London City Airport is forecast to hit 28°C today, yet the Polymarket contract for the highest temperature on 15 July 2026 currently prices the YES outcome at 0%, a stark divergence from the live 28°C reading at the station. This zero-probability imprint suggests the market is treating the event as impossible to resolve within the defined ranges, likely because the settlement window closes at 12:00 UTC and the current 9:17 UTC reading may not yet reflect the day’s peak, or the ranges themselves exclude 28°C entirely.

Historically, mid-July highs at EGLC frequently land between 27°C and 30°C, with 28°C appearing as the frontrunner in similar prediction markets at 57% probability, followed by 27°C at 22% [1]. The current 0% YES price contradicts this pattern, implying either a mispricing of the conditional tokens or a structural flaw in how the ranges are defined relative to Wunderground’s resolution data. Traders holding USDC on Polygon should note that conditional token positions will only settle once Wunderground confirms the day’s maximum, not the current snapshot.

The key catalyst is the 12:00 UTC settlement cutoff: if the peak temperature occurs after 12:00 UTC, the market may resolve to a lower range or fail to resolve cleanly. Watch Wunderground’s hourly updates for EGLC and the BBC Weather pressure trend, which is falling at 1012mb with 88% humidity—conditions that often suppress afternoon peaks [2]. A sudden southerly wind shift could push temperatures higher, but the current 0% price leaves little room for error in the range definitions.

Sources: 1 · 2 · 3

Methodology

This page reviews Highest temperature in London on July 15? 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 Scam?, 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.

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.

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.