Highest temperature in Wellington on August 15?

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Market context

Wellington's highest temperature on 15 August 2026 will be measured at Wellington International Airport using Weather Underground's Daily Observations table, which records sub-hourly readings rather than the rounded summary figures. August is Wellington's coldest month, with mean daily highs around 12–13°C and extremes rarely exceeding 18°C. The 0% crowd probability suggests traders expect temperatures to fall below the lowest available range bracket, though the exact threshold depends on how the market's resolution bands are structured.

Historical August data from Wellington Airport shows that temperatures above 16°C occur in roughly 5–10% of years during this month, whilst readings above 18°C are exceptionally rare. The 2015 August maximum reached 17.3°C; the 2010 August high was 16.9°C. Most years see August peaks between 12–15°C. The current probability distribution reflects this seasonal pattern, with the crowd pricing in a typical or below-typical August day.

Traders should monitor the Southern Oscillation Index and sea-surface temperatures in the Tasman Sea during early August, as these influence whether a warm northerly flow reaches Wellington. MetService forecasts released in early August will provide the first concrete indication of whether an anomalous warm spell is developing. Any significant warming system tracking towards the region in the days before 15 August would be the primary catalyst for reconsidering the current pricing, though such events remain statistically unlikely for Wellington in mid-winter.

Methodology

Sports-specific comparison page for Highest temperature in Wellington on August 15?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.

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