Highest temperature in Hong Kong on August 8?

Platform comparison

Market context

Hong Kong’s highest temperature on 8 August will be fixed by the Hong Kong Observatory’s final “Absolute Daily Max” reading for that date, and the current crowd-implied probability of **0% YES** looks far below what August climatology normally suggests. The Observatory’s long-run normals for 8 August show a daily maximum around **31.7°C**, with the city’s hot season often producing lows in the high 20s and highs in the low 30s, so any market price near zero is implying an exceptionally cold outcome relative to the calendar norm.[5]

Comparable August cases argue for treating a zero line cautiously, because Hong Kong can and does reach the mid-30s in late summer. The Observatory recorded **34.4°C** on 8 August 2020 as the month’s peak, and the city’s all-time high was **36.3°C** on 8 August 2015.[11][1] More recently, 2024 was described by the Observatory as an exceptionally hot August, with mean daily maximum temperature **1.0°C above normal**, reinforcing that the upper tail in this part of the year is materially above the climatological mean.[19] On that basis, a sportsbook-style line or analyst consensus that tracks seasonal norms would usually sit well above 0%, making the current prediction-market price look like a clear outlier if it reflects the same temperature thresholding.

The main catalyst is the Observatory’s afternoon and evening observations, followed by the later publication of the day’s extract; the market cannot settle until the **8 August 2026** data are finalised in the relevant Daily Extract.[6] Early-hour readings already showed **29°C** at the Observatory at 3 a.m., which matters only as a starting point, not as a settlement guide, because the contract resolves on the day’s maximum and Hong Kong’s peak temperatures typically arrive later in the day.[6][3] Traders watching cross-platform pricing should focus on whether the intraday heat builds towards the low-to-mid 30s or whether cloud, showers, or a tropical system cap the high below the usual August band.[3][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on August 8? 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.