Wellington has a temperate marine climate resulting in moderate weather conditions through-out the year. Temperatures seldom rise above 25 °C (77 °F), or fall below 4 °C (39 °F).

The warmest recorded temperature in Wellington is 31.1 °C (88 °F), while -1.9 °C (28 °F) is the coldest. The hill suburbs and Hutt Valley are subject to frost between May and September. Snow rarely troubles the area and last visited on 14 August 2011.

The weather in Wellington averages about 169 days (or 2025 hours) of sunshine annually.

Being close to the Cook Straight and located on Latitude 41.2 degrees south contributes to the city being windy throughout the year. This is particularly noticeable in the winter months when southerly winds make the temperature feel much cooler.

Wellington has a relatively high rainfall, averaging 1249mm per annum. June and July are the wettest months.