Highest temperature in Hong Kong on July 3?

Platform comparison

Market context

On 3 July 2026, the Hong Kong Observatory will record the absolute daily maximum temperature in degrees Celsius, with this market resolving to the range containing that figure. Today, Polymarket prices the YES contract at 0%, implying the crowd believes the temperature will not fall within the specified range, despite July historically being Hong Kong’s hottest month.

Historical data frames this near-zero probability as an outlier. AccuWeather forecasts July 2026 highs between 86°F and 96°F (30°C to 35°C), while the Hong Kong Observatory’s seasonal forecast for July–September 2026 expects normal to above-normal temperatures [2]. For comparison, 3 July 2025 saw a maximum of 31°C, and recent forecasts for early July 2026 indicate a maximum of 31°C with 80% humidity [5]. The 0% price contradicts these consistent warm patterns, suggesting a potential mispricing unless the specified range is exceptionally low.

Traders should monitor the Observatory’s Daily Extract publication, which finalises the “Absolute Daily Max” data after the settlement window closes on 3 July 2026 at 12:00 UTC. The resolution depends entirely on this official source, not third-party forecasts. Watch for any sudden weather announcements, such as the recent cold weather warning issued earlier in 2026, though such events are rare in July [9]. The on-chain mechanics on Polygon, using USDC and conditional tokens, will execute automatically once the data is published, with no manual intervention required.

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 Kalshi UK, 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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.