Highest temperature in Wellington on July 20?

Platform comparison

Market context

Wellington is experiencing a cool, south-westerly day with temperatures hovering around 15°C, yet the prediction market for the city’s peak heat on 20 July 2026 has assigned a 0% probability to any outcome above 12°C. This stark divergence between current conditions and the market’s implied certainty suggests traders are betting on a historically typical mid-summer cool snap rather than an extreme heat event. The market currently leans entirely on the 12°C outcome, which holds a 100% probability, indicating that the crowd views higher temperatures as virtually impossible for this specific date and location.

Historical weather patterns for Wellington in late July consistently show mild conditions, with average highs rarely exceeding 14°C and frequent dips below 10°C due to the city’s exposure to Tasman Sea winds. Comparable cases from the past decade show that temperatures above 15°C on 20 July are exceptionally rare, reinforcing the market’s confidence in the 12°C cap. The 0% probability for higher ranges aligns with long-term climatological data from the Wellington International Airport Station, which records few instances of summer heat spikes during this period.

Traders should monitor real-time updates from Wunderground, the official resolution source, as well as short-term forecasts from the BBC Weather service, which currently reports a 15°C reading with strong south-westerly winds. Any sudden shift in wind direction or unseasonal warming trend before the settlement window closes at 12:00 UTC on 20 July could challenge the current consensus, though no such catalysts are currently scheduled. The market’s heavy weighting on 12°C reflects a reliance on established seasonal norms rather than speculative weather anomalies.

Sources: 1 · 2

Methodology

This page tracks Highest temperature in Wellington on July 20? 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 Trump Prediction provide a 0%-fee route into the same order book.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

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.

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.