Highest temperature in London on July 5?

Platform comparison

Market context

On 5 July 2026, London City Airport is experiencing sunny intervals with a moderate breeze, pushing the daily high to 29°C as confirmed by current BBC Weather observations[1]. The Met Office also forecasts a maximum of 29°C for the day, aligning with real-time data that shows the temperature holding near 26°C at 6 PM[4]. This immediate weather reality frames the market’s 0% YES probability, suggesting the crowd correctly anticipates the temperature will not breach the upper threshold required for a “YES” resolution.

Historically, July is London’s hottest month, with average highs around 22°C (72°F), yet extreme days frequently reach 28–30°C[3]. Recent years show similar patterns; for instance, July 2026 forecasts indicate daily highs ranging from 21°C to 31°C (71°F to 87°F), confirming that 29°C sits within the typical upper band rather than an outlier[6]. A programmatically minded trader would model this using historical Wunderground data, noting that temperatures exceeding 30°C are rare but possible, making the current 0% probability a calculated bet on statistical norms rather than absolute certainty[9].

Traders should monitor incoming severe thunderstorm clusters, which the National Weather Service flags as a potential disruptor for temperature records[5]. While today remains dry, any sudden shift in wind patterns or humidity could alter the evening peak, though current humidity sits high at 88% with falling pressure[1]. No major announcements are scheduled, but dependencies on real-time Wunderground updates remain critical for final settlement, as the market resolves strictly on the highest recorded temperature for all times on this day[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in London on July 5? 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 Review 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.

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 Review 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.