Highest temperature in London on August 1?

Platform comparison

Market context

Polymarket has this contract at **0% YES** even though the live book is clearly pointing to a warm London reading, with the leading price sitting around **26°C** on the platform and neighbouring outcomes still carrying some weight. Because settlement is on the **highest temperature recorded at London City Airport Station** and paid out in **USDC** via **Polygon conditional tokens**, the relevant question is not just the daytime forecast but what the station ultimately logs before the market’s resolution cut-off. The market also stays open to revisions until the first datapoint for the following date appears on Wunderground, so late adjustments can still matter if the day’s maximum is updated before that publish point.[1]

The current probability should be read against a summer profile where London often clusters in the low-to-mid 20s Celsius, but brief overshoots into the high 20s are common enough that a flat 0% looks disconnected from the weather setup rather than from the mechanics of the contract.[2][4] That matters on Polymarket because even a small shift in forecast maxima can move money quickly between adjacent temperature bands, especially when traders are pricing a single station rather than the broader city. Recent UK coverage has already pointed to a sunny, mild-to-warm start to August, with some forecasts around **26°C** and others higher, which is exactly the sort of spread that creates dispersion around the market’s central strike.[10][15]

For traders, the key catalysts are the **Met Office-style intraday forecast updates**, cloud cover and wind changes through the afternoon, and any late-day change in the recorded maximum at the airport station itself.[1][15] The settlement window ending **2026-08-01T12:00:00Z** means positions are effectively betting on the full-day maximum that will be observed later in the local afternoon, while the on-chain token pricing can still react before the final Wunderground datapoint is published.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in London on August 1? 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Scam?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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 Polymarket Scam? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.