Highest temperature in London on July 17?

Platform comparison

Market context

London City Airport is set to record its peak temperature for 17 July 2026, with the market currently pricing a specific outcome at zero per cent despite the settlement window closing today. The crowd-implied probability of 0% for the YES outcome suggests traders view the selected range as impossible, yet the frontrunner on the broader platform is 28°C at 50%, followed by 29°C at 32%[1]. This divergence frames the current 0% line as a heavy underdog position, where the consensus leans heavily toward the mid-to-high 20s rather than the extreme low or high outliers that might trigger a YES resolution.

Historical July peaks at EGLC often cluster between 26°C and 31°C, making a 0% probability on a narrow range a contrarian signal if that range sits outside the typical band. Traders should monitor the live BBC Weather feed for current conditions, which show 13°C with falling pressure and southerly winds, indicating the day’s thermal trajectory is still developing[2]. The primary catalyst is the final Wunderground daily report for EGLC, which will lock the resolution once the 12:00 UTC deadline passes, meaning intraday volatility could still shift the implied odds if the market remains open for late adjustments before settlement.

Sources: 1 · 2

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 Who Will Win 2026, 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 Who Will Win 2026. 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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

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.