Highest temperature in Guangzhou on June 4?

Platform comparison

Active sub-markets

Market context

Guangzhou will record a daily high temperature on 4 June 2026, measured at Baiyun International Airport Station. The market resolves based on Weather Underground's historical data for that specific location and date, with settlement occurring at 12:00 UTC on the same day. This timing creates a hard deadline: traders cannot adjust positions after the overnight low has passed and the day's peak temperature is locked in.

Guangzhou's June climate is consistently warm and humid, with historical June highs typically ranging between 32–35°C. The 0% crowd probability across prediction platforms suggests either extreme confidence in a specific temperature band or sparse liquidity in this particular market. Cross-platform comparison reveals divergent approaches: Polymarket displays decimal odds and charges 2% maker/taker fees, whilst Kalshi offers binary yes/no contracts with lower fees (0.25%) but stricter US-based KYC requirements that exclude many international traders. Betfair and Smarkets operate as betting exchanges with lay options, allowing traders to short outcomes—a structural advantage when assessing tail-risk scenarios like unseasonable cold snaps.

The key variable is monsoon activity and tropical systems in early June. The South China Sea monsoon typically intensifies during this period, potentially bringing cloud cover and rain that could suppress peak temperatures. Traders should monitor China Meteorological Administration forecasts and tropical cyclone tracking from the Joint Typhoon Warning Center in the week preceding 4 June. Historical precedent shows June temperatures in Guangzhou rarely dip below 28°C or exceed 37°C, constraining the realistic range despite the market's broad categorical structure.

Methodology

We read Highest temperature in Guangzhou on June 4? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Is this market available outside the US?

Polymarket Alternative UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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'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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative UK triggers a quick verification flow that finishes in 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.