Highest temperature in Shanghai on July 3?

Platform comparison

Market context

The real-world event this market tracks is the peak temperature recorded at Shanghai Pudong International Airport on 3 July 2026, measured in degrees Celsius. Current crowd-implied probability for the market resolving above 30°C sits at 0% YES, yet short-range models and recent Polymarket data suggest highs near 28–29°C, with 30°C as the frontrunner at 37–56% implied probability depending on the specific outcome bin[1][2]. This divergence between the 0% crowd figure and the model-guided 37–56% range highlights how different platforms interpret uncertainty: Polymarket uses decimal odds reflecting implied probability, while Kalshi and Betfair often quote decimal odds directly, and fee structures vary significantly, with some requiring KYC and others remaining permissionless.

Historically, July is Shanghai’s hottest month, with average highs at Pudong reaching 87°F (30.6°C) and summer peaks regularly exceeding 30°C, sometimes hitting 35°C under sunny conditions[6][7]. Recent observations at nearby Hongqiao Airport recorded a high of 29°C with thundery showers on 3 July 2026, indicating that cloud cover and rain may suppress temperatures below the 30°C threshold[4]. Traders should monitor the National Weather Service’s 72-hour timeseries for ZSPD and Wunderground’s daily history, as thundery activity and mist—already visible at 2:30 am with 100% humidity—could keep highs near 28–29°C[3]. The settlement window ends 2026-07-03T12:00:00Z, so real-time updates from Wunderground will be decisive, and platforms like Smarkets may offer tighter spreads on implied probability versus Polymarket’s odds-based liquidity.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shanghai on July 3? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.