August is one of the warmer months of the year in Wellington, with average highs near 20°C and lows around 10.9°C (mean 15.5°C). It is about average for rainfall, averaging 66 mm of rainfall and 83% relative humidity across the period.
August is one of the warmer months of the year in Wellington. Across 45 years of records, the warmest August in Wellington was 1997 — when the month averaged 17.9°C — while the coldest was 1986 at 12.7°C. Typical August days reach 20°C with nights near 10.9°C. The long-term trend is warming, about 0.2°C per decade.
August is about average for rainfall in Wellington, averaging 66 mm of rainfall. The wettest August on record was 1992 with 128 mm, while the driest was 1995 at 9 mm.
Relative humidity in Wellington during August averages 83%. The most humid August was 2002 at 86%, and the least humid was 1990 at 77%.
August receives about 4 kWh/m²/day of solar energy in Wellington. The sunniest August was 1995 at 5.1 kWh/m²/day, and the cloudiest were 1986 and 2008 at 3.4.
Average wind speed in Wellington during August is 2.8 m/s. The windiest August was 1985 at 4 m/s, while the calmest were 2002, 2003 and 2022, among others at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.8°C | 15.7°C | 15.7°C | 15.1°C | 16.2°C | +1.4°C |
| Avg High | 19.3°C | 20.5°C | 20.1°C | 19.6°C | 20.9°C | +1.6°C |
| Avg Low | 10.4°C | 10.8°C | 11.2°C | 10.7°C | 11.6°C | +1.2°C |
| Avg Rain | 67 mm | 63 mm | 67 mm | 77 mm | 50 mm | -17 mm |
August temperatures in Wellington have risen by about 0.8°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 5.1°C (1993) to a record high of 30.9°C (1990).
Rainfall in August is about average for rainfall, averaging 66 mm, with a wettest year of 128 mm.
One of the best times to visit Wellington
August is one of the best times to visit Wellington. Expect days averaging 20°C and nights around 10.9°C (mean 15.5°C) — warmer than Wellington's yearly average — with moderate rainfall (66 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 21.7°C | 16.7°C | 11.7°C | 26.2°C | 8.7°C | 23 mm | 79% | 2.7 m/s | 4.4 |
| 2024 | 20.5°C | 15.9°C | 11.3°C | 25.5°C | 8.1°C | 33 mm | 84% | 3.2 m/s | 3.8 |
| 2023 | 20.1°C | 15.7°C | 11.2°C | 25.0°C | 8.7°C | 69 mm | 84% | 2.9 m/s | 3.9 |
| 2022 | 22.6°C | 17.3°C | 12.1°C | 29.4°C | 7.7°C | 29 mm | 78% | 2.2 m/s | 4.8 |
| 2021 | 19.5°C | 15.2°C | 10.9°C | 21.7°C | 7.6°C | 44 mm | 85% | 2.6 m/s | 3.7 |
| 2020 | 20.9°C | 16.5°C | 12.2°C | 28.5°C | 5.5°C | 102 mm | 85% | 3.2 m/s | 3.8 |
| 2019 | 20.7°C | 16.1°C | 11.5°C | 26.5°C | 8.0°C | 81 mm | 83% | 3.2 m/s | 4.3 |
| 2018 | 20.7°C | 15.9°C | 11.1°C | 25.4°C | 6.3°C | 62 mm | 82% | 2.6 m/s | 3.9 |
| 2017 | 18.9°C | 14.6°C | 10.3°C | 22.9°C | 7.1°C | 70 mm | 84% | 2.7 m/s | 3.9 |
| 2016 | 20.4°C | 15.9°C | 11.4°C | 25.1°C | 8.6°C | 77 mm | 84% | 3 m/s | 4.2 |
| 2015 | 19.3°C | 14.8°C | 10.2°C | 23.9°C | 7.4°C | 93 mm | 83% | 2.8 m/s | 3.7 |
| 2014 | 18.0°C | 13.8°C | 9.6°C | 21.2°C | 5.9°C | 109 mm | 83% | 3.3 m/s | 4.1 |
| 2013 | 20.2°C | 15.6°C | 11.0°C | 27.2°C | 7.5°C | 59 mm | 84% | 2.8 m/s | 4.1 |
| 2012 | 19.8°C | 15.6°C | 11.4°C | 23.3°C | 6.1°C | 85 mm | 85% | 2.9 m/s | 3.6 |
| 2011 | 19.0°C | 14.8°C | 10.5°C | 23.6°C | 7.2°C | 49 mm | 81% | 2.7 m/s | 3.7 |
| 2010 | 18.7°C | 14.3°C | 9.9°C | 23.5°C | 5.5°C | 85 mm | 84% | 3 m/s | 3.9 |
| 2009 | 20.0°C | 15.6°C | 11.1°C | 23.1°C | 7.9°C | 52 mm | 85% | 3.2 m/s | 4 |
| 2008 | 19.7°C | 15.6°C | 11.6°C | 23.4°C | 6.8°C | 100 mm | 86% | 3.3 m/s | 3.4 |
| 2007 | 19.4°C | 14.8°C | 10.1°C | 24.6°C | 7.3°C | 41 mm | 84% | 3 m/s | 4.4 |
| 2006 | 19.4°C | 15.2°C | 11.1°C | 25.7°C | 7.9°C | 58 mm | 83% | 3.1 m/s | 3.7 |
| 2005 | 20.3°C | 15.4°C | 10.5°C | 26.2°C | 7.8°C | 49 mm | 83% | 2.7 m/s | 4.6 |
| 2004 | 20.7°C | 16.5°C | 12.3°C | 26.2°C | 8.2°C | 121 mm | 84% | 2.6 m/s | 4 |
| 2003 | 21.8°C | 16.8°C | 11.8°C | 29.5°C | 5.2°C | 24 mm | 83% | 2.2 m/s | 4.1 |
| 2002 | 20.2°C | 15.8°C | 11.3°C | 24.8°C | 9.0°C | 65 mm | 86% | 2.2 m/s | 3.7 |
| 2001 | 20.0°C | 15.6°C | 11.3°C | 23.8°C | 8.0°C | 90 mm | 85% | 2.5 m/s | 3.8 |
| 2000 | 19.7°C | 15.4°C | 11.0°C | 23.9°C | 7.7°C | 71 mm | 85% | 2.4 m/s | 4.1 |
| 1999 | 19.3°C | 15.2°C | 11.0°C | 25.0°C | 6.7°C | 123 mm | 85% | 2.4 m/s | 3.8 |
| 1998 | 19.9°C | 14.9°C | 9.9°C | 24.8°C | 6.1°C | 41 mm | 84% | 2.9 m/s | 4.3 |
| 1997 🔥 | 22.7°C | 17.9°C | 13.1°C | 27.8°C | 9.8°C | 96 mm | 82% | 2.5 m/s | 4.1 |
| 1996 | 19.9°C | 15.4°C | 10.8°C | 26.8°C | 7.7°C | 65 mm | 81% | 2.8 m/s | 4.1 |
| 1995 | 22.9°C | 17.4°C | 11.9°C | 28.2°C | 7.0°C | 9 mm | 78% | 2.5 m/s | 5.1 |
| 1994 | 18.9°C | 14.7°C | 10.4°C | 24.5°C | 6.8°C | 63 mm | 82% | 2.9 m/s | 4.2 |
| 1993 | 18.5°C | 13.6°C | 8.7°C | 21.9°C | 5.1°C | 47 mm | 82% | 2.7 m/s | 4.1 |
| 1992 🌧️ | 18.8°C | 14.4°C | 9.9°C | 23.0°C | 5.6°C | 128 mm | 81% | 3.4 m/s | 4 |
| 1991 | 21.6°C | 16.1°C | 10.6°C | 25.0°C | 7.2°C | 21 mm | 80% | 2.6 m/s | 4.3 |
| 1990 | 22.3°C | 17.1°C | 12.0°C | 30.9°C | 8.9°C | 37 mm | 77% | 2.8 m/s | 4.1 |
| 1989 | 20.2°C | 15.3°C | 10.5°C | 23.8°C | 6.1°C | 43 mm | 80% | 3.1 m/s | 4.4 |
| 1988 | 18.4°C | 14.0°C | 9.6°C | 25.1°C | 6.0°C | 64 mm | 83% | 3.1 m/s | 4 |
| 1987 | 19.2°C | 14.8°C | 10.4°C | 25.8°C | 5.3°C | 54 mm | 84% | 2.6 m/s | 3.7 |
| 1986 ❄️ | 16.6°C | 12.7°C | 8.8°C | 20.7°C | 5.4°C | 118 mm | 83% | 3.1 m/s | 3.4 |
| 1985 | 17.5°C | 13.7°C | 9.8°C | 21.9°C | 6.9°C | 91 mm | 85% | 4 m/s | 3.7 |
| 1984 | 21.6°C | 16.8°C | 12.0°C | 26.3°C | 6.8°C | 57 mm | 80% | 2.2 m/s | 4.6 |
| 1983 | 20.9°C | 15.9°C | 10.8°C | 25.9°C | 5.5°C | 33 mm | 82% | 2.3 m/s | — |
| 1982 | 18.9°C | 14.7°C | 10.5°C | 24.3°C | 6.8°C | 68 mm | 83% | 3.2 m/s | — |
| 1981 | 20.5°C | 15.7°C | 11.0°C | 24.3°C | 6.6°C | 76 mm | 83% | 2.2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 20°C with lows near 10.9°C (mean 15.5°C), based on 45 years of NASA POWER data.
August averages 66 mm of rainfall in Wellington, about average for rainfall. The wettest on record was 128 mm in 1992.
The hottest August reached 30.9°C in 1990. The coldest dipped to 5.1°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.8°C. Daytime highs moved from 19.9°C to 20.9°C and overnight lows from 10.8°C to 11.4°C over the same span.
August is one of the warmer months of the year in Wellington and about average for rainfall, so plan for around 20°C daytime highs and 10.9°C at night.
Not quite — August is the 11th coolest month in Wellington, averaging 15.5°C.
For August in Wellington, pack light layers you can adjust through the day, with typical highs of 20°C and lows of 10.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 83% — quite humid.
Average wind speed in August is 2.8 m/s. The windiest August on record averaged 4 m/s (1985).
The wettest August on record was 1992 with 128 mm. On average, August sees 66 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Wellington behaves each August, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for August specifically, along with year-by-year records and how the month has changed over the decades.
