Highest temperature in Chengdu on August 3?

Platform comparison

Market context

Chengdu’s official airport reading will be set by the highest temperature recorded at Chengdu Shuangliu International Airport Station during the settlement window, so the key variable is the day’s peak rather than the morning start or the evening cool-down. In practice, a programmatic approach would weight intraday forecast updates, radar-driven rain timing, and any airport-station observation feed more heavily than citywide averages, because a brief sunny spell can still produce the day’s maximum even in a humid monsoon pattern.

The broader August pattern in Chengdu is hot, muggy and rain-prone. Long-run guides put typical daytime highs around 30–32°C, with some descriptions of August as the city’s hottest month and frequent short showers that do not necessarily suppress peak temperatures for long[2][6][14][16]. Forecast pages for 3 August 2026 cluster around the low-30s Celsius, with examples at 33°C and rain or cloud in the forecast, which is consistent with a market that should be priced around a low-30s outcome rather than an extreme heat spike[1][3][5][13]. The crowd-implied 0% YES looks detached from those baselines unless the contract’s YES definition maps to a very high temperature band.

For trading, the main catalysts are the first high-quality morning forecast from a source tied to the airport, then any midday updates showing convection, cloud build-up or a rain band arriving before the warmest part of the day. Chengdu forecasts often shift materially because afternoon showers and humidity affect realised highs, and the airport’s own observed maximum can differ from city forecasts by a degree or two[8][15][18]. A bot watching this market would typically reprice on hourly forecast revisions, precipitation probability changes, and the first observed temperature trend after local sunrise, rather than waiting for the final daily close.

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). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.