Highest temperature in London on July 5?

Platform comparison

Market context

The real-world event hinges on the highest temperature recorded at London City Airport on 5 July 2026, measured in degrees Celsius and resolved via Wunderground data. Current crowd-implied probability sits at 0% for any specific range, reflecting the market’s early stage before the settlement window closes in 2026. Historically, July is London’s hottest month, with average highs around 22°C (72°F) at this station, though extremes have occurred. For instance, London recorded 40.2°C in 2022 at Heathrow, but such peaks are rare at City Airport due to its coastal exposure and urban microclimate [3][7].

Traders should monitor upcoming Met Office forecasts and severe weather alerts, as clusters of thunderstorms could suppress temperatures or cause volatile spikes. A recent Met Office update notes a maximum of 29°C for the area, with falling pressure and breezy conditions suggesting potential instability [4]. Programmatically, bots would query Wunderground’s daily history API at 12:00 UTC on 5 July 2026, parsing the “High Temp” field for EGLC. Conditional orders could be triggered if real-time data exceeds 25°C, a threshold above the 22°C average but below the 29°C forecast cap [3][4]. No moralising on trade necessity; the facts stand: volatility is likely, and data latency is the primary dependency.

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 Bot UK, which mirrors the Polymarket order book directly.

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 Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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