Highest temperature in London on July 24?

Platform comparison

Market context

The outcome depends on the highest temperature recorded at London City Airport on 24 July, measured in degrees Celsius and taken from Wunderground’s daily history page for EGLC. In simple terms, a **YES** share pays out if the final reading lands inside the market’s specified temperature band; a **NO** share wins if it does not, so the price is just the crowd’s estimate of that band being hit.

A current **0% YES** price means traders are effectively saying the chosen band is either extremely unlikely or that the market has been mispriced relative to the expected range. London’s July climate usually sits much lower than heatwave conditions, with average daytime highs around the low-20s Celsius and many days closer to 23°C than to extreme heat, which is why upper temperature brackets tend to draw less support outside exceptional spells.[2][5] Earlier July 2026 coverage showed London in a hot period with highs above 30°C and a Met Office-defined heatwave, but those conditions can fade quickly and do not tell you what the airport station will record on this specific afternoon.[1][3]

For traders, the key catalysts are the short-range forecast updates before noon UTC, plus any shift in cloud cover, wind, or rain that can cap the daytime peak. Because the settlement window ends at 12:00 UTC, the relevant question is not the day’s full warmth but the highest reading reached before that time at London City Airport, so late-morning model changes matter more than headlines about the wider day. In prediction markets, that means the price can move sharply if forecasters revise the expected maximum by even 1–2°C, especially in a city where coastal influence and passing showers can make station-specific temperatures diverge from London-wide averages.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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 Prediction Market UK. 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.

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.

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