**Traders are heavily favoring a 13–14°C high for Wellington on August 27, 2026, with those two outcomes capturing over 87% of the market-implied probability.** This consensus reflects the latest short-range forecast guidance showing a southerly wind shift following today’s strong northwesterlies, limiting daytime warming under mostly cloudy skies and possible showers. August climatology for Wellington (average August high near 13–15°C) provides context, but current conditions feature a ridge-trough pattern with a front approaching from the Tasman Sea. Recent observations show highs of 14–17°C on August 25–26 amid variable winds; the expected southeasterly to southerly flow tomorrow (typically 15–25 km/h) will advect cooler maritime air, capping temperatures. Model consensus from sources such as MetService, GFS/ECMWF runs, and local guidance clusters the daily maximum in the 12–14°C range, with only modest spread from cloud-cover timing or exact wind transition. Key resolution factors include the official maximum recorded at Wellington’s primary observing site (likely the airport or central station). Any delay in the southerly change or clearer breaks could push readings toward 15°C (currently 8.5% implied), while stronger or earlier cooling would favor 13°C or below. Updated model runs and MetService briefings over the next 12–24 hours represent the primary near-term catalysts that could shift these tightly clustered probabilities.