Pronóstico: Highest temperature in London on July 17?

Platform comparison

Market context

London City Airport is currently recording 13°C with 88% humidity and falling pressure, a cool start that aligns with the crowd-implied 0% probability for the highest temperature hitting the 80–81°F (26.7–27.2°C) range on this specific date in 2026 [2]. Historical July highs at EGLC often struggle to breach 27°C without a sustained heat dome, and the current southerly flow at 8 mph suggests moisture rather than the dry, stagnant air typically required for extreme heat spikes [2][3].

Traders monitoring this USDC-denominated contract on Polygon should watch the Met Office’s 24-hour forecast updates for any sudden shift to easterly winds or a drop in cloud cover, as these are the primary catalysts for rapid temperature escalation in London [2]. The settlement relies exclusively on Wunderground’s daily maximum for EGLC, meaning even a brief afternoon spike could resolve the market, but the current atmospheric pressure of 1012mb falling indicates instability rather than the high-pressure ridge needed for record highs [2].

On-chain, the conditional tokens for this weather event remain heavily weighted toward the “No” outcome, reflecting the lack of immediate heatwave signals in the UK’s current weather models. With the settlement window closing at 12:00 UTC today, the market’s 0% YES price implies that the probability of EGLC reaching 27°C within the next three hours is negligible given the present 18°C reading and high humidity [3].

Sources: 1 · 2 · 3

Methodology

We track Pronóstico: Highest temperature in London on July 17? 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

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 Qué Es. 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 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 Qué Es 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.