Highest temperature in London on June 19?

Platform comparison

Active sub-markets

Market context

London City Airport has already registered temperatures in the low to mid-teens Celsius this morning, with BBC Weather showing 13°C at the station and a forecast high of 25°C for the day, while the Met Office has a forecast maximum of 23°C. That puts the market’s 0% yes price in sharp contrast to the live weather picture: the settlement depends on the single highest reading logged at the airport station before the window closes, not on any end-of-day average or “feels like” value.[1][7]

For context, early-summer London temperatures often land in the high teens or low 20s Celsius, so a final maximum in the 20s would be unremarkable rather than exceptional. The current pricing appears to be leaning on the fact that the market’s resolution source is a specific station reading at London City Airport, which can differ from broader London forecasts and from nearby showers that may cap the day’s top temperature; similar airport-based weather markets tend to move most when the forecast high is revised intraday, rather than on broad seasonal norms.[1][4][6]

The main catalyst for traders is the updated station forecast through the afternoon, especially whether cloud cover, rain bands, or a warmer southerly flow allow the thermometer to reach the low or mid-20s. Wunderground’s daily history page for London City Airport is the eventual settlement reference, so any late rise in the observed maximum before the window closes matters more than headline forecasts elsewhere; BBC Weather and the Met Office both currently point to a mild, but not extreme, summer day.[1][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in London on June 19? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

Where can I trade this market with the lowest fees?

On Election Predictions UK, which mirrors the Polymarket order book at 0% fees. 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?

Not under $1,500 of lifetime trading volume. Above that threshold, Election Predictions 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.