Highest temperature in Wellington on August 18?

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Market context

Wellington International Airport's maximum temperature on 18 August 2026 will be recorded by the station's meteorological instruments and resolved against Weather Underground's Daily Observations table. August is mid-winter in New Zealand's capital, with historical August averages around 11–12°C for daily highs, though the city's exposed location and variable weather patterns mean individual days can deviate significantly from seasonal norms.

Wellington's winter temperature distribution shows considerable volatility. The airport station has recorded August highs ranging from near 5°C during cold southerly outbreaks to 18–20°C during rare warm spells driven by northwesterly flow. The 0% crowd probability suggests traders expect a particularly cold outcome or are pricing in uncertainty about which specific temperature band will resolve. Historical data from the past decade indicates roughly 20–25% of August days at Wellington Airport exceed 15°C, whilst fewer than 5% reach 18°C or above during this month.

Key variables affecting the outcome include the timing and intensity of any high-pressure systems crossing the region in mid-August, which could drive temperatures well above seasonal averages, and conversely, any southerly or southwesterly airflow that would suppress maxima. The Southern Hemisphere winter pattern in late August sometimes transitions toward spring conditions, introducing additional variability. Traders should monitor long-range forecasts from the National Institute of Water and Atmospheric Research (NIWA) released in the weeks prior to settlement, as these typically provide the most reliable guidance for New Zealand's winter weather patterns at that lead time.

Methodology

Sports-specific comparison page for Highest temperature in Wellington on August 18?. 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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