Highest temperature in Guangzhou on June 27?

Platform comparison

Active sub-markets

Market context

The underlying event is the peak daytime temperature recorded at Guangzhou Baiyun International Airport on 27 June 2026, measured in degrees Celsius and sourced from Wunderground. Historical data confirms Guangzhou’s June climate is extremely hot and humid, with a record high of 36.6°C and typical daily highs clustering between 31°C and 35°C[1][8]. The current crowd-implied probability of 0% for a specific temperature range appears inconsistent with this baseline, as late-June highs rarely dip below 31°C[8]. Platforms diverge sharply here: Polymarket often displays decimal odds favouring speculative ranges, whereas Kalshi and Betfair emphasise implied probabilities with stricter KYC, potentially suppressing liquidity on niche weather events. Fee structures also vary, with Smarkets offering lower commissions but requiring identity verification that may deter casual traders on short-dated climate markets[1].

Traders must monitor real-time synoptic conditions, particularly the strength of the subtropical high-pressure system dominating the region, which drives temperatures upward[1]. Recent forecasts for June 2026 indicate daily highs between 85°F and 95°F (approximately 29°C–35°C), with frequent downpours that could temporarily lower peaks[2][3]. A key catalyst is the potential arrival of typhoons, which June occasionally experiences and could disrupt temperature records[1]. Platforms like Kalshi may delay settlement pending official meteorological confirmations, while Polymarket often resolves faster based on automated Wunderground feeds, creating arbitrage opportunities if data lags occur. The settlement window closes at 12:00 UTC on 27 June, meaning traders should watch hourly updates from 06:00 to 12:00 UTC for the definitive peak[1]. Fee differences and KYC thresholds further influence where liquidity concentrates, with Kalshi’s regulatory compliance sometimes limiting access for international participants compared to Polymarket’s more open model.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Guangzhou on June 27? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

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

Where can I trade this market with the lowest fees?

On Polymarket Alternative, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket Alternative 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.

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.