Pronóstico: Highest temperature in Hong Kong on June 29?

Platform comparison

Market context

The Hong Kong Observatory is forecasting above-normal temperatures for June 2026, with daily highs expected to reach between 34°C and 37°C, making the current 0% YES probability on the highest temperature contract on Polymarket appear starkly low. This market, settled on USDC via Polygon using conditional tokens, resolves to the Celsius range containing the absolute daily maximum recorded on 29 June 2026, yet the crowd has priced in near-zero chance of any significant heat spike.

Historical data frames this probability poorly: Hong Kong recorded its hottest day of the year so far on 29 May 2026, hitting 34.6°C, while the Observatory has warned of extreme heat in the New Territories reaching 37°C in recent days[7][9]. The seasonal forecast explicitly states above-normal temperatures for June–August 2026, contradicting the market’s implied certainty that no high temperature will occur[1][5].

Traders should monitor the Observatory’s upcoming “Daily Extract” publication, which finalises the “Absolute Daily Max (deg. C)” for 29 June, as this is the sole resolution source[1]. The WMO’s 2026–2030 projection of 1.3–1.9°C above pre-industrial averages further supports the likelihood of record heat, meaning the catalyst is not a weather event but the official data release itself[3]. Until the Daily Extract is published, the market cannot resolve, leaving USDC liquidity exposed to the final temperature reading.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Hong Kong on June 29? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Qué Es, which mirrors the Polymarket order book at 0% fees.

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

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 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.

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.

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.