Highest temperature in Hong Kong on July 25?

Platform comparison

Market context

Polymarket is pricing this Hong Kong July 25 temperature contract with the top two bins tied near the front at **33°C** and **34°C**, each at 32%, while the crowd is effectively assigning only a **1%** chance to the market’s current YES side. That means the market is leaning towards a fairly warm but not extreme afternoon peak, with the on-chain position settled in **USDC** on **Polygon** via conditional tokens once the Hong Kong Observatory publishes the final daily extract.

For context, Hong Kong’s July climate is normally hot and humid, with average highs around **32°C** and frequent rain, which can cap daytime maxima even when the air mass is oppressive. Travel guides describe July as the city’s hottest month, but also one of its wettest, so the most relevant analogue for this contract is not just heat but whether showers, cloud cover, or thunderstorms limit the day’s absolute maximum from reaching the upper-30s bins. The present pricing suggests traders see a modest skew towards the low-30s, consistent with a typical summer day rather than a clear heatwave.

The main things to watch are the Hong Kong Observatory’s evening and early-morning updates, the final **Daily Extract**, and any shift in forecast guidance on cloud, rain, or thunderstorm timing before the **25 July 12:00 UTC** settlement window closes. Because the market resolves off the Observatory’s published “Absolute Daily Max (deg. C)” in Celsius to one decimal place, late changes in the official record matter more than headlines alone. Traders are effectively holding a binary exposure to the exact bin that the final reading lands in, so the last forecast update before publication is usually the decisive catalyst.

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Methodology

This page reviews Highest temperature in Hong Kong on July 25? 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

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

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 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.

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.