Highest temperature in Chengdu on June 20?

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Market context

Polymarket is pricing the Chengdu June 20 temperature contract at **0% YES** on USDC collateral and Polygon-settled conditional tokens, so the market is currently treating a qualifying high as effectively unreachable. The underlying event is the highest temperature recorded at Chengdu Shuangliu International Airport Station on 20 June 2026, with resolution tied to the Wunderground daily history page rather than a headline city forecast.

For context, June in Chengdu is normally warm enough that a high in the high 20s to low 30s Celsius is routine, with typical June averages around 24°C and daily highs often cited near 28–31°C. Comparable seasonal guides also note that late-June spikes into the mid-to-high 30s Celsius can happen, so a 0% price is more consistent with a very specific range expectation than with an assumption that the day will be cool. That matters on Polymarket because the payout is determined by the observed airport reading, not by broader city averages or whether conditions feel oppressive elsewhere in Sichuan. [1][2][5][7]

A trader watching this market should focus on near-term Chengdu weather updates, especially any heatwave signal, rain band, or cloud cover that could cap the day’s maximum temperature before midday local time. Chengdu’s June weather is also shaped by the early summer rainy season, which can suppress highs even when the broader monthly norm is warm; that makes the airport station reading more sensitive to short-lived changes in sun exposure and precipitation than a simple monthly average suggests. On a practical level, the on-chain position only changes if someone buys or sells the USDC-denominated conditional tokens, so the key catalyst is not the abstract climate backdrop but whether fresh forecasts shift traders’ expectations of a specific recorded high. [2][3][4][10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Chengdu on June 20? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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?

On Polymarket UK, 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.

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.

Do I need to KYC for this market?

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