Highest temperature in Shanghai on July 4?

Platform comparison

Market context

On 4 July 2026, the Shanghai Pududong International Airport Station will record its peak daily temperature in degrees Celsius, a real-world metric that determines the outcome of this prediction market. Historical data confirms that July is Shanghai’s hottest month, with average highs reaching 32.5°C (90.5°F) and frequent spikes exceeding 35°C (95°F) during sunny conditions[1][4][6]. The current crowd-implied probability of 0% for any specific range appears inconsistent with these long-term patterns, as temperatures rarely fall below 25°C or exceed 40°C in this period[1][7]. Comparable cases from recent summers show that extreme heat events, such as the 40.4°C reading recorded in Pudong this summer, are not anomalies but part of a recurring seasonal trend[7].

Traders should monitor the Shanghai Meteorological Bureau’s daily forecasts and Wunderground’s live temperature logs, which serve as the official resolution source for this market[7]. A key catalyst is the anticipated heatwave scheduled for early July, which could push temperatures toward the upper bounds of the 35–40°C range[7]. Recent news from Bloomberg Asia highlights that parts of Pudong have already exceeded 40°C, suggesting that similar conditions may persist or intensify by 4 July[7]. The market’s book depth is directly tied to funding flows from payment rails like Klarna and SEPA, as deposit friction and withdrawal fees influence trader participation and liquidity. As on-ramp costs decrease, more capital enters the book, sharpening price efficiency around the most probable temperature range.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on July 4? with a focus on payment rails and deposit friction. Polymarket accepts USDC on Polygon only; Kalshi only ACH/Plaid (US only); Betfair card/SEPA in EU/UK; Manifold no deposit. Polymarket Klarna UK additionally offers Klarna and SOFORT as fiat on-ramps to USDC. Live odds reflect the Polymarket order book.

Resolution & payout

Settlement path determines payout latency. Polymarket settles on-chain (USDC, minutes). Broker frontends like Polymarket Klarna UK add Klarna/SOFORT as fiat withdrawal options with T+1 processing. Kalshi: USD via ACH (T+1 to T+3). Betfair: local currency via card/SEPA (T+1 to T+5).

FAQ

How does Klarna deposit work on Polymarket Klarna UK?

You enter the deposit amount in EUR/GBP, choose Klarna as the method, run through Klarna's standard authentication (Pay Later or Direct Bank Transfer), and Polymarket Klarna UK converts internally to USDC for the Polymarket order book. Processing: typically under 30 minutes.

Which payment methods are supported?

Klarna (Pay Now / Pay Later), SOFORT, SEPA bank transfer, credit card (Visa/Mastercard), Apple Pay, Google Pay, and direct USDC deposit on Polygon. Availability depends on your jurisdiction.

What's the minimum deposit?

10 EUR / 10 USD equivalent. No upper limit, but deposits over $1,500 lifetime volume trigger a quick KYC flow (typically 5-10 minutes).

How do withdrawals work?

Identical methods in reverse. SEPA withdrawal: T+1 (standard) or under 10 seconds (SEPA Instant). Klarna withdrawals process via bank-account refund. USDC withdrawal to external wallet: Polygon gas cost (typically $0.01).

Are payment details protected?

Yes. Card and bank details are never stored by Polymarket Klarna UK — they pass directly through PCI-DSS compliant payment service providers (Adyen, Stripe). Polymarket Klarna UK retains only transaction IDs and Klarna reference numbers for reconciliation.