Highest temperature in Hong Kong on July 3?

Platform comparison

Market context

Hong Kong’s July 3, 2026, maximum temperature is the real-world event this contract resolves to, with the Hong Kong Observatory’s official “Absolute Daily Max” in degrees Celsius serving as the sole settlement source. Today, Polymarket prices a YES bet on any temperature range above the current threshold at 0%, reflecting the crowd’s near-total certainty that the recorded high will fall below the lowest available range. This on-chain pricing, settled in USDC on the Polygon network via conditional tokens, treats the underlying meteorological data as a binary outcome with no meaningful upside probability.

Historical July highs in Hong Kong consistently exceed 30°C, with AccuWeather forecasting daily peaks between 86°F and 96°F (30°C–35.5°C) for July 2026, and the Hong Kong Observatory’s seasonal forecast predicting normal to above-normal temperatures for July–September 2026[2][3]. Even the most recent 3 July forecast listed a maximum of 31°C, well above the implied threshold for a 0% YES price[5]. The current market probability appears misaligned with decades of observed summer data, where lows rarely dip below 27°C and highs routinely breach 32°C.

Traders should monitor the Hong Kong Observatory’s upcoming “Daily Extract” publication, which finalises the official temperature record, and watch for any sudden shifts in ENSO conditions or monsoon activity that could alter July’s thermal profile[2]. While no immediate weather announcements have been issued, the Observatory’s 9-day forecast and seasonal guidance remain the primary catalysts for reassessing the 0% pricing[2][10]. Any deviation from the expected normal-to-above-normal trend would be the first credible signal to challenge the current market consensus.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 3? 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

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 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.