Highest temperature in London on May 30?

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Market context

On 30 May 2026, the highest temperature recorded at London City Airport will fall into one of several defined ranges. The settlement mechanism pulls directly from Wunderground's historical weather database for that specific station and date, with resolution occurring after the settlement window closes at midday UTC. For programmatic traders, this requires parsing Wunderground's daily history pages and mapping the recorded high against the market's predefined temperature brackets—a straightforward data-matching task suitable for conditional order logic or automated monitoring bots.

London's late May temperatures typically cluster between 18–22°C, with historical highs occasionally reaching 25–27°C during warm spells. The 0% crowd probability suggests the market may be pricing in either an unusually cool May or reflects thin liquidity on a distant-dated weather contract. Comparable May days from recent years show that temperatures above 28°C are rare but not unprecedented; the 2022 heatwave saw late-May highs exceed 30°C across southern England. Traders evaluating this market should cross-reference the UK Met Office's seasonal forecasts and historical anomaly patterns for May in the London area.

The key variable is atmospheric setup in late May 2026: whether high-pressure systems dominate (favouring warmth) or Atlantic low-pressure systems prevail (suppressing highs). Seasonal climate indices and extended-range forecasts become actionable roughly two weeks before the event. Traders using conditional orders should set triggers based on Met Office updates or European model consensus shifts, as these typically drive material repricing in weather markets with settlement dates beyond the standard 10-day forecast horizon.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), 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

Is this market available outside the US?

Polymarket Bot UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Bot UK triggers a quick verification flow that finishes in 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.