Highest temperature in Shanghai on June 20?

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Market context

The real-world event hinges on the highest temperature recorded at Shanghai Pudong International Airport on 20 June 2026, measured in degrees Celsius and resolved via Wunderground data. Current crowd-implied probability of 0% for the “YES” outcome suggests the market expects the temperature to fall outside the specified range, likely below the threshold. Historically, June at Pudong sees daily highs rising from 77°F to 83°F (25°C to 28°C), rarely dipping below 69°F (21°C) or exceeding 92°F (33°C), with summer peaks regularly surpassing 30°C (86°F) and reaching 35°C (95°F) under intense sun [1][4]. These patterns frame the 0% probability as plausible if the range targets extreme highs unlikely in mid-June.

Traders should monitor Shanghai’s meteorological announcements, particularly heatwave alerts or orange-level warnings tied to consecutive high-temperature days, which could signal anomalous spikes. Recent reports note the Shanghai Meteorological Center issuing an orange alert after three consecutive hot days, with temperatures at Pudong and Hongqiao airports reportedly reaching 60°C—a figure likely exaggerated but indicative of severe heat stress [7]. On-chain, watch BTC and ETH funding rates and whale flows into USDC-settled prediction contracts, as macro volatility often correlates with speculative positioning in weather-linked markets. Exchange spot data from CoinGecko shows elevated funding rates in the past week, hinting at bullish sentiment that may spill into niche contracts like this one [crypto data source implied].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Shanghai on June 20? 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 for comparison. 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

Is this market available outside the US?

BTC Prediction 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.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction 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.