August is one of the warmer months of the year in Nelson, with average highs near 21.6°C and lows around 9.2°C (mean 15.4°C). It is one of the drier months, averaging 35 mm of rainfall and 63% relative humidity across the period.
August is one of the warmer months of the year in Nelson. Across 45 years of records, the warmest August in Nelson was 2022 — when the month averaged 18°C — while the coldest was 1995 at 12.6°C. Typical August days reach 21.6°C with nights near 9.2°C. The long-term trend is warming, about 0.2°C per decade.
August is one of the drier months in Nelson, averaging 35 mm of rainfall. The wettest August on record was 2023 with 115 mm, while the driest was 2003 at 9 mm.
Relative humidity in Nelson during August averages 63%. The most humid August was 2025 at 73%, and the least humid was 2003 at 49%.
August receives about 5.4 kWh/m²/day of solar energy in Nelson. The sunniest Augusts were 2011 and 2012 at 6.3 kWh/m²/day, and the cloudiest was 2021 at 4.4.
Average wind speed in Nelson during August is 0.3 m/s. The windiest Augusts were 2018, 2019 and 2023, among others at 0.4 m/s, while the calmest were 2022, 2024 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.9°C | 15.2°C | 15.7°C | 15.4°C | 15.8°C | +0.9°C |
| Avg High | 21.1°C | 21.3°C | 22.3°C | 21.4°C | 21.7°C | +0.6°C |
| Avg Low | 8.7°C | 9.1°C | 9.1°C | 9.4°C | 10.0°C | +1.3°C |
| Avg Rain | 43 mm | 31 mm | 27 mm | 28 mm | 59 mm | +16 mm |
August temperatures in Nelson have risen by about 1.1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -0.6°C (2008) to a record high of 34.6°C (2018).
Rainfall in August is one of the drier months, averaging 35 mm, with a wettest year of 115 mm.
One of the best times to visit Nelson
August is one of the best times to visit Nelson. Expect days averaging 21.6°C and nights around 9.2°C (mean 15.4°C) — warmer than Nelson's yearly average — with moderate rainfall (35 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 | 21.8°C | 16.2°C | 10.7°C | 28.1°C | 5.4°C | 53 mm | 73% | 0.3 m/s | 5.1 |
| 2024 | 21.2°C | 15.4°C | 9.7°C | 31.2°C | 4.0°C | 72 mm | 73% | 0.3 m/s | 5.1 |
| 2023 🌧️ | 21.8°C | 15.9°C | 9.9°C | 31.4°C | 3.5°C | 115 mm | 71% | 0.4 m/s | 5.2 |
| 2022 🔥 | 24.3°C | 18.0°C | 11.7°C | 30.1°C | 4.5°C | 27 mm | 65% | 0.3 m/s | 5.7 |
| 2021 | 20.2°C | 14.6°C | 9.1°C | 28.5°C | 2.2°C | 62 mm | 71% | 0.3 m/s | 4.4 |
| 2020 | 20.9°C | 14.9°C | 8.9°C | 30.7°C | 2.0°C | 24 mm | 66% | 0.3 m/s | 6.1 |
| 2019 | 21.3°C | 15.3°C | 9.3°C | 28.7°C | 5.0°C | 32 mm | 67% | 0.4 m/s | 5.7 |
| 2018 | 21.4°C | 15.5°C | 9.6°C | 34.6°C | 4.8°C | 17 mm | 67% | 0.4 m/s | 5.1 |
| 2017 | 23.0°C | 16.4°C | 9.9°C | 30.1°C | 4.9°C | 20 mm | 64% | 0.4 m/s | 5.6 |
| 2016 | 20.9°C | 14.7°C | 8.6°C | 26.9°C | 4.7°C | 25 mm | 71% | 0.3 m/s | 5.4 |
| 2015 | 21.3°C | 15.4°C | 9.4°C | 30.5°C | 2.7°C | 38 mm | 64% | 0.3 m/s | 5 |
| 2014 | 20.6°C | 15.2°C | 9.8°C | 27.9°C | 4.5°C | 52 mm | 73% | 0.3 m/s | 5 |
| 2013 | 21.3°C | 15.7°C | 10.1°C | 25.7°C | 5.3°C | 38 mm | 70% | 0.4 m/s | 5.1 |
| 2012 | 22.1°C | 15.9°C | 9.7°C | 28.2°C | 2.8°C | 16 mm | 63% | 0.4 m/s | 6.3 |
| 2011 | 21.9°C | 15.6°C | 9.3°C | 27.5°C | 4.0°C | 10 mm | 59% | 0.4 m/s | 6.3 |
| 2010 | 20.4°C | 14.1°C | 7.9°C | 27.2°C | 0.9°C | 28 mm | 62% | 0.3 m/s | 5.4 |
| 2009 | 22.9°C | 16.2°C | 9.5°C | 30.1°C | 4.9°C | 26 mm | 58% | 0.3 m/s | 5.6 |
| 2008 | 21.5°C | 15.0°C | 8.6°C | 32.3°C | -0.6°C | 53 mm | 62% | 0.3 m/s | 5.2 |
| 2007 | 20.9°C | 14.4°C | 7.8°C | 28.2°C | 2.3°C | 21 mm | 58% | 0.4 m/s | 5.5 |
| 2006 | 21.9°C | 15.2°C | 8.5°C | 28.2°C | 2.6°C | 15 mm | 56% | 0.4 m/s | 5.7 |
| 2005 | 21.9°C | 15.3°C | 8.6°C | 28.1°C | 3.6°C | 21 mm | 57% | 0.4 m/s | 6.1 |
| 2004 | 22.6°C | 16.7°C | 10.9°C | 31.4°C | 6.1°C | 76 mm | 65% | 0.3 m/s | 4.8 |
| 2003 | 24.5°C | 17.7°C | 10.8°C | 33.1°C | 6.1°C | 9 mm | 49% | 0.4 m/s | 5.8 |
| 2002 | 21.1°C | 14.4°C | 7.7°C | 26.8°C | 3.1°C | 15 mm | 58% | 0.3 m/s | 5.8 |
| 2001 | 24.3°C | 17.1°C | 9.9°C | 30.9°C | 5.6°C | 14 mm | 51% | 0.4 m/s | 5.9 |
| 2000 | 21.2°C | 14.9°C | 8.6°C | 27.6°C | 1.7°C | 16 mm | 57% | 0.3 m/s | 5.9 |
| 1999 | 21.0°C | 15.4°C | 9.8°C | 28.0°C | 2.9°C | 65 mm | 70% | 0.3 m/s | 5.2 |
| 1998 | 23.1°C | 16.8°C | 10.5°C | 28.5°C | 5.0°C | 17 mm | 57% | 0.3 m/s | 6.1 |
| 1997 | 20.8°C | 15.2°C | 9.5°C | 31.6°C | 3.8°C | 23 mm | 65% | 0.3 m/s | 5.5 |
| 1996 | 21.3°C | 15.1°C | 8.8°C | 28.9°C | 3.2°C | 21 mm | 59% | 0.4 m/s | 5.6 |
| 1995 ❄️ | 18.3°C | 12.6°C | 6.8°C | 26.2°C | 3.2°C | 37 mm | 63% | 0.3 m/s | 4.6 |
| 1994 | 23.3°C | 16.4°C | 9.5°C | 30.4°C | 1.6°C | 12 mm | 52% | 0.4 m/s | 5.6 |
| 1993 | 19.4°C | 13.2°C | 7.1°C | 25.6°C | 1.1°C | 42 mm | 66% | 0.3 m/s | 5.2 |
| 1992 | 22.2°C | 15.6°C | 9.0°C | 31.4°C | -0.3°C | 13 mm | 53% | 0.4 m/s | 5.5 |
| 1991 | 21.5°C | 16.0°C | 10.5°C | 27.2°C | 5.4°C | 35 mm | 65% | 0.3 m/s | 5.6 |
| 1990 | 21.7°C | 15.8°C | 9.9°C | 28.4°C | 3.2°C | 42 mm | 64% | 0.3 m/s | 5.3 |
| 1989 | 19.4°C | 13.6°C | 7.9°C | 28.8°C | 3.0°C | 83 mm | 68% | 0.3 m/s | 4.5 |
| 1988 | 22.7°C | 15.5°C | 8.3°C | 30.8°C | 3.7°C | 11 mm | 52% | 0.3 m/s | 5.5 |
| 1987 | 20.6°C | 13.8°C | 7.1°C | 28.2°C | 2.4°C | 23 mm | 61% | 0.3 m/s | 5.2 |
| 1986 | 23.7°C | 16.7°C | 9.7°C | 30.0°C | 3.4°C | 23 mm | 56% | 0.4 m/s | 6.1 |
| 1985 | 19.7°C | 13.5°C | 7.4°C | 25.2°C | 2.8°C | 36 mm | 59% | 0.3 m/s | 5.1 |
| 1984 | 20.8°C | 14.8°C | 8.7°C | 26.7°C | 1.5°C | 31 mm | 63% | 0.4 m/s | 5.3 |
| 1983 | 21.4°C | 15.9°C | 10.3°C | 29.9°C | 5.2°C | 73 mm | 69% | 0.3 m/s | — |
| 1982 | 18.9°C | 13.6°C | 8.4°C | 26.3°C | 5.1°C | 74 mm | 71% | 0.3 m/s | — |
| 1981 | 23.0°C | 16.8°C | 10.6°C | 29.2°C | 4.9°C | 34 mm | 65% | 0.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 21.6°C with lows near 9.2°C (mean 15.4°C), based on 45 years of NASA POWER data.
August averages 35 mm of rainfall in Nelson, one of the drier months. The wettest on record was 115 mm in 2023.
The hottest August reached 34.6°C in 2018. The coldest dipped to -0.6°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.1°C. Daytime highs moved from 20.8°C to 21.9°C and overnight lows from 9.1°C to 10.2°C over the same span.
August is one of the warmer months of the year in Nelson and one of the drier months, so plan for around 21.6°C daytime highs and 9.2°C at night.
Not quite — August is the 11th coolest month in Nelson, averaging 15.4°C.
For August in Nelson, pack light layers you can adjust through the day, with typical highs of 21.6°C and lows of 9.2°C.
Relative humidity in August averages 63% — moderately humid.
Average wind speed in August is 0.3 m/s. The windiest August on record averaged 0.4 m/s (1981).
The wettest August on record was 2023 with 115 mm. On average, August sees 35 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 Nelson 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.
