Pronóstico: Highest temperature in Hong Kong on June 30?

Platform comparison

Market context

The Hong Kong Observatory’s absolute daily maximum temperature on 30 June 2026 is the real-world event this market resolves, with crowd-implied probability currently at 100% YES for the highest range. On Polymarket, this contract trades at near-maximum price today, reflecting USDC liquidity on the Polygon network and the conditional token structure that locks in the outcome once the Daily Extract is finalized.

Historical June data frames this certainty: long-term averages show daytime highs of 30°C to 31°C, with summer months (June–August) typically reaching 28°C to 32°C [1][3]. The Observatory’s seasonal forecast for June–August 2026 explicitly predicts above-normal temperatures, reinforcing the 100% probability [4]. Recent records support this trend, including Hong Kong’s hottest day of the year so far at 34.6°C in late June 2026 [7].

Traders should monitor the Observatory’s Daily Extract publication schedule, as the market cannot resolve until data is finalized [1]. Key catalysts include ENSO status updates and tropical storm passages, which average 1.4 days in June and can spike temperatures [1]. The multi-model consensus forecast system used by the Observatory [8] and the latest climate model guidance [4] will determine the final recorded value, with no resolution possible before official publication.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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 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.

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.