Pronóstico: Highest temperature in Tokyo on June 30?

Platform comparison

Market context

Tokyo’s June climate is historically mild, with daily highs typically capping around 25°C, making a record-breaking heat spike on 30 June 2026 exceptionally unlikely. This aligns with the current crowd-implied probability of 0% YES for temperatures exceeding the market’s threshold, as June remains Tokyo’s coolest summer month before the intense heat of July and August arrives[4]. Historical data from similar early-summer dates, such as 7 June and 9 June 2026, show consistent maximums well below 30°C, reinforcing that the market’s pricing reflects robust seasonal patterns rather than speculative doubt[2][3].

Traders should monitor the Japan Meteorological Agency’s latest warm-season forecast, which predicts above-normal temperatures across Japan due to a strengthening Pacific High extending toward Honshu[6]. While this trend raises concerns about extreme heat later in summer, the rainy season (Tsuyu) still dominates late June, with intermittent drizzles and moderate humidity limiting peak temperatures[5]. The key catalyst is the official end of the rainy season; if it concludes earlier than expected, the risk of sustained high heat increases, potentially shifting conditional token valuations on Polygon. Resolution hinges on Wunderground’s first published data point for 30 June, measured to whole degrees Celsius, with no revisions accepted after that timestamp[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Tokyo on June 30? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Argentina, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.