Highest temperature in Hong Kong on July 20?

Platform comparison

Market context

Hong Kong’s highest temperature on 20 July 2026 is the real-world event determining this contract, with the market currently pricing a 0% chance for any outcome above the implied threshold, effectively treating the YES side as impossible. On Polymarket, the frontrunner is 29°C at 86% probability, while 30°C holds 14%, reflecting a tight consensus around mild summer peaks rather than extreme heat. These conditional tokens, settled in USDC on Polygon, lock in positions until the Hong Kong Observatory publishes its Daily Extract, which finalises the Absolute Daily Max in degrees Celsius to one decimal place.

Historically, mid-July highs in Hong Kong often cluster between 28°C and 31°C, but 29°C has been a frequent ceiling in recent years when cloud cover or sea breezes moderate peak readings. The current 0% YES probability aligns with this pattern, suggesting traders expect no record-breaking surge. Comparable cases from 2023 and 2024 show similar distributions, where 29°C dominated despite warmer regional trends, reinforcing the market’s confidence in a stable, non-extreme outcome.

Traders should monitor the Hong Kong Observatory’s Daily Extract release schedule, as settlement hinges entirely on this official data. Any pre-announcement of unusual weather patterns—such as a typhoon approaching or a prolonged heatwave from the mainland—could shift probabilities, though no such alerts have been issued recently. According to a recent update from the Observatory, current conditions remain typical for July, with no immediate catalysts expected to disrupt the 29°C consensus before the 2026-07-20T12:00:00Z settlement window closes.

Sources: 1

Methodology

This page reviews Highest temperature in Hong Kong on July 20? 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 PolyGram, 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 PolyGram. 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.

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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.