Highest temperature in Beijing on July 11?

Platform comparison

Market context

Beijing faces its peak summer heat on 11 July 2026, with the Beijing Capital International Airport Station expected to record temperatures near or above 40°C, a level that historically triggers public health warnings. The current 0% implied probability for a “YES” outcome on Polymarket suggests the crowd believes the temperature will fall outside the specific range offered, though this diverges sharply from Kalshi’s decimal-odds format, which would express the same view as a price below 0.01 rather than a probability. While Polymarket requires no KYC for many users and charges a flat 2% fee on winnings, Kalshi mandates full identity verification and applies a tiered fee structure, creating a liquidity gap for casual traders comparing books on this weather event.

Historical data shows July is Beijing’s hottest month, with 2023 reaching 40°C and the all-time record of 41.9°C set in 1999[1][2]. Daily highs in July typically average 31°C (88°F), rarely dropping below 26°C (78°F) or exceeding 36°C (96°F)[3]. The 0% probability on Polymarket appears inconsistent with these patterns, whereas Betfair’s decimal odds would likely reflect a non-zero price if liquidity existed, highlighting how platform mechanics shape perceived risk. Smarkets, with its 2% commission on net winnings and no KYC for small accounts, might offer a more accessible entry point for traders betting against the crowd-implied certainty.

Traders should monitor the National Meteorological Centre of China’s daily heatwave bulletins and Wunderground’s real-time station data for ZBAA, the official resolution source[1]. A recent Reuters report confirms China recorded its hottest month in recent history in July 2024, reinforcing the likelihood of extreme temperatures in 2026[10]. No official announcements are expected before settlement, but sudden cloud cover or rain could suppress peaks below the threshold. The divergence between Polymarket’s binary probability and Kalshi’s price-based odds means traders must adjust their risk models depending on which book they use, as the same event carries different structural implications across platforms.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Beijing on July 11? 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 Kalshi 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.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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 supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi 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.