Highest temperature in London on July 15?

Platform comparison

Market context

The market tracks the peak temperature recorded at London City Airport on 15 July 2026, with settlement tied to Wunderground’s daily high for EGLC. Today, the station currently reads 28°C, but the official daily maximum remains unconfirmed until the settlement window closes at 12:00 UTC. The crowd-implied 0% probability on the YES side suggests the market expects the peak to fall outside the specific range defined by the contract, likely because the current reading is already near or above the threshold, or the range is set for a cooler outcome.

Historically, mid-July highs at EGLC often cluster between 24°C and 31°C, with 2022’s record heat pushing London above 40°C in surrounding areas, though EGLC typically stays slightly cooler due to its riverside, urban location. In comparable years like 2018 and 2023, daily peaks hovered around 27–29°C, making a 0% YES probability plausible only if the contract range is set below current levels or for an unusually cool scenario. Programmatic traders should back-test EGLC’s July 15 highs from 2015–2025 to calibrate conditional orders against the Wunderground API.

Key catalysts include the Met Office’s 24-hour forecast updates and real-time pressure trends, which today show falling pressure at 1012mb—a signal often linked to cloud cover or rain that could suppress the daily peak. Traders monitoring this market programmatically should hook into the Met Office’s hourly data feed and Wunderground’s live EGLC stream to trigger exits if the temperature dips below the contract’s threshold before 12:00 UTC. A recent BBC Weather update confirms southerly winds and 88% humidity, conditions that may limit further heating today [2].

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Methodology

We track Highest temperature in London on July 15? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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.

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.

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.