Highest temperature in Shenzhen on July 21?

Platform comparison

Market context

Shenzhen Bao'an International Airport is currently overcast with a temperature of 84°F (29°C) and 83% humidity, while forecasts indicate a 90% chance of precipitation for the day. This wet, cloudy condition suppresses peak heating, aligning with the 0% crowd-implied probability that the highest temperature will breach extreme thresholds. Historical data shows July is Shenzhen’s hottest month, yet the monthly average high is only 32°C (90°F), with 17 rainy days typical due to the subtropical high and typhoon influence [3].

Comparable cases from recent Julys demonstrate that heavy cloud cover and rain consistently cap temperatures near the 29–30°C range, rarely exceeding 32°C even on clear days. The current overcast sky and high precipitation probability mirror these cooling patterns, making extreme heat events statistically improbable. Traders should monitor real-time updates from Wunderground for the official daily maximum, as the settlement relies strictly on the highest recorded temperature at this station [market description].

Key catalysts include any sudden shifts in typhoon activity or subtropical high pressure, which could alter cloud cover and humidity levels. While no specific weather announcements are imminent, the 90% precipitation forecast remains the primary dependency for temperature suppression [2]. In crypto markets, similar weather-driven prediction contracts often see USDC settlement tied to BTC/ETH volatility, but here the outcome hinges entirely on meteorological data rather than exchange spot prices or whale flows.

Sources: 1 · 2 · 3

Methodology

This page reads Highest temperature in Shenzhen on July 21? 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

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

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.

How volatile are crypto prediction markets?

Crypto markets react to spot prices — a 5% BTC move typically shifts a "BTC above X by date" market 10-20%. Polymarket crypto market liquidity is usually six-figure USD, sufficient for active trading.

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.