Highest temperature in Chengdu on June 20?

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Market context

Chengdu’s airport temperature on 20 June will hinge on whether the city gets a routine warm spell or a sharper late-June surge, with the contract resolving to the highest reading at Chengdu Shuangliu International Airport Station. June normals are already warm: WeatherSpark puts average daily highs in Chengdu around **81–83°F** (about **27–28°C**), while travel guides note that highs of **35–39°C** can occasionally appear in mid to late June.[1][5] Against that backdrop, a crowd-implied probability of **0% YES** looks detached from the climatological range, especially if the market’s YES bucket is set to a higher temperature band than the recent seasonal norm.[1][2]

Comparable June temperature markets in Chengdu have generally favoured mid-20s to low-30s Celsius outcomes rather than extreme heat, which is consistent with the city’s humid summer profile and frequent rain interruptions.[1][6] That matters because traders should read the current line as a comparison between the market’s implied band and the historical distribution, not as a direct forecast of “hot” versus “not hot”. If sportsbook pricing is available, it will usually react more to short-term forecast model shifts than prediction markets do, so any divergence is most likely to come from different treatment of a single hot afternoon versus the full-day maximum at the airport station.[1][4]

The main catalysts are the day’s local forecast updates, cloud cover, rainfall timing, and whether Chengdu sits under a temporary heat ridge or a more typical rainy-season pattern. June in Chengdu is also known for frequent precipitation, with some guides citing up to **13 rainy days** in the month, which can cap the daytime maximum even when humidity is high.[6] Because settlement uses the airport station’s recorded maximum, late-afternoon clearing or convective showers matter more than headline city averages, and the key watchpoint is whether the operational forecast trend moves decisively towards the upper 30s Celsius rather than the high-20s to low-30s baseline.[1][5][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets, 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?

Best Prediction Markets 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.

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, Best Prediction Markets 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.