Highest temperature in Shanghai on July 28?

Platform comparison

Market context

Shanghai's summer temperatures in late July typically peak between 32–36°C, with occasional extremes reaching 37–38°C during heat waves. The settlement hinges on the highest reading recorded at Pudong International Airport on 28 July 2026, resolved via Wunderground historical data. The 0% crowd probability suggests traders are either uncertain about the market's mechanics or expect resolution data to remain unavailable at settlement, a common friction point for weather markets on crypto platforms where real-time data feeds can lag or disconnect.

Historical July records for Shanghai show the city regularly experiences temperatures above 35°C in the final week of the month, with 2013 and 2017 both recording peaks near 37°C during comparable periods. The current probability distribution reflects either extreme scepticism about data availability or a technical issue with how the market's resolution brackets are structured. Weather prediction markets typically see activity cluster as the event date approaches, particularly when traders gain confidence in data sourcing.

Catalysts for this market centre on seasonal weather patterns and any anomalous atmospheric conditions developing in East Asia through mid-2026. Traders should monitor China Meteorological Administration forecasts and historical Wunderground records for Shanghai to calibrate expectations against the resolution brackets offered. The USDC settlement mechanism means execution depends entirely on whether Wunderground's historical archive remains accessible and unambiguous on the settlement date—a dependency that has historically caused disputes in weather-based crypto markets when data sources experience outages or retroactive adjustments.

Methodology

This page reads Highest temperature in Shanghai on July 28? 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.

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.

Are crypto prediction markets taxable in the US?

In the US, prediction market gains are typically treated as ordinary income or short-term capital gains depending on holding period. Consult a tax professional for your specific situation — we cannot provide tax advice.