Highest temperature in London on August 2?

Platform comparison

Market context

Polymarket is currently pricing the London City Airport reading for 2 August as a modestly warm outcome, with the contract centred on **27°C** at **52%** and **26°C** at **26%**. On the platform, that means traders are buying and selling USDC-backed conditional tokens on Polygon, with the winning temperature band paid out at **$1** per share if the station’s highest recorded temperature falls into that range before the settlement cut-off.

That pricing sits between ordinary late-summer London weather and a genuine warm-spell setup. Polymarket’s own market page cites Met Office forecasts for a daytime maximum of **27°C** under strengthening high pressure, light winds and a southerly flow, while recent reporting has London at **28°C** with sunny skies and warmth continuing into the first weekend of August.[1][2] Similar forecasts on weather aggregators are clustered around the high-20s, which helps explain why the market is leaning towards 26°C–27°C rather than the cooler bins.[3][7]

For traders, the practical watchpoints are the same ones that can move a temperature market in the final hours: updated Met Office guidance, cloud cover, wind shifts and whether London actually gets a late-afternoon peak rather than an early plateau. The contract also depends on how the Wunderground history page logs the station’s daily high, so the final print matters more than headline city forecasts, and revisions are only relevant until the first datapoint for the following date is published.[1] With the crowd at 0% for YES on the specific wording of “highest temperature” in the chosen band, the key question is whether the day’s top reading lands exactly where the current weather setup suggests, or whether a brief warm spike pushes it into a higher range.

Sources: 1 · 2 · 3 · 4 · 5

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 Polymarket Alternative UK, which mirrors the Polymarket order book directly.

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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Alternative UK 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.