Highest temperature in London on August 2?

Platform comparison

Market context

London’s afternoon peak on 2 August is the real-world event here, and the market is pricing **0% YES**, which makes the consensus a strong underdog against even a modestly warm finish. The key distinction is that this contract settles on the highest temperature recorded at London City Airport Station, so the relevant question is not whether it feels hot in central London, but whether EGLC prints into the chosen Celsius band before midday UTC.

On the comparison set, the prevailing read is for a **mid-to-upper 20s Celsius** high, with current Met Office-style forecast language pointing to around **27°C** and a broader range of **26°C to 28°C** appearing in market and forecast snapshots.[2][6] That leaves the 0% implied price looking extreme if the day behaves like a standard sunny summer session rather than a washed-out one. The favourite remains the 26–28°C cluster, while the value case for a contrarian sits either in a cooler outcome if cloud or sea breeze caps the airport reading, or in a hotter-than-expected push if insolation and light winds allow a brief overshoot.

What matters now is the late-morning evolution: cloud cover, wind direction, and whether London City Airport warms faster than the wider city under the current high-pressure setup.[2] A recent UK weather report also points to a warm spell persisting, with London forecast around **28°C** and sunny skies, which supports the over side more than the under.[1] Traders should watch for any forecast revisions from major forecast desks and the first authoritative readings around the settlement window, because a small change in the airport maximum can move this market from an ordinary warm-day outcome into a materially different band.[2][1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on August 2? 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 Who Will Win 2026, 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'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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.