Highest temperature in Guangzhou on August 4?

Platform comparison

Market context

Guangzhou’s heat on 4 August will be decided by the highest reading at Baiyun Airport, with the market settling in USDC to the temperature band that captures the day’s peak on Wunderground. The live forecast picture is not extreme by local standards: current guidance clusters around the low 30s Celsius, with Guangzhou’s official provincial forecast calling for 25–32°C and third-party August guides showing highs mostly in the 33–35°C range, alongside rain or showers. [2][3][14]

The 0% crowd-implied YES probability suggests the market is pricing in a band mismatch rather than an unusual weather outcome, which is common in temperature contracts when the reference station, settlement range, or intraday peak is easy to misread. Guangzhou’s August climate is typically hot and humid, with average highs around 33–34°C and frequent rain, so the main risk is usually a brief afternoon spike above forecast rather than a cold day. That means traders tend to watch whether the airport station prints a higher maximum than city forecasts imply, especially if cloud break, sun angle, or local convective heating briefly lift temperatures. [1][11][15][17]

For catalysts, the key inputs are the day’s evolving Guangzhou/Baiyun Airport observations, any late-morning or afternoon shower line updates, and whether the airport gets the same humidity-rain suppressing effect seen in the regional forecast. On the crypto side, this is a simple on-chain payout market, so settlement risk is mainly about the oracle source rather than market microstructure; if broader BTC or ETH volatility is sharp, it can affect attention and liquidity, but not the weather print itself. Current conditions around Guangzhou show warm, humid, showery weather, which is consistent with a modest ceiling on the day’s high unless cloud cover clears for several hours. [7][17][2]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Guangzhou on August 4? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

Can I use Bitcoin directly?

No, Polymarket operates exclusively in USDC on Polygon. You can bridge BTC to USDC via an exchange or bridge service and deposit on Polygon — typically 10-30 minutes processing time.

How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

Which crypto markets exist on Polymarket?

Currently active markets include BTC/ETH/SOL price targets, halving dates, ETF approvals, hard-fork outcomes and Layer-2 TVL thresholds. The list updates weekly; biggest volume sits on BTC and ETH price forecasts.