Highest temperature in Tokyo on June 30?

Platform comparison

Market context

The real-world event is the daily high temperature recorded at Tokyo Haneda Airport on 30 June 2026, which will determine the market’s resolution. Historical data shows that late June in Tokyo typically sees highs between 28°C and 30°C, with the hot season officially beginning on 29 June and averaging above 79°F (26°C) thereafter[5]. While Japan recorded a national peak of 41.2°C in Tamba city during the hottest June on record in 2025, Tokyo itself has never exceeded 36.4°C in June, even during extreme heatwaves[2][8]. Given this 0% crowd-implied probability for a “YES” outcome, the market likely leans on the expectation that temperatures will remain within the typical 28–30°C range, far below any record-breaking threshold.

Traders should monitor official weather bulletins from the Japan Meteorological Agency and real-time updates from Wunderground, the designated resolution source, as these will confirm the day’s peak temperature[2]. Key catalysts include any sudden shifts in atmospheric pressure, incoming cloud cover, or unseasonal rainfall, which could suppress temperatures below the usual late-June average. Additionally, watch for government heatstroke warnings, which have been issued across 33 prefectures during past extreme heat events and may signal a spike in temperatures[2]. The market is leaning on the absence of such extreme weather indicators, as no major climate anomalies have been forecast for Tokyo on this date.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Tokyo on June 30? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Election Predictions UK provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Election Predictions UK route into the same order book at 0% fees.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.