August is one of the cooler months of the year in Blenheim, with average highs near 10.3°C and lows around 3.4°C (mean 6.9°C). It is about average for rainfall, averaging 76 mm of rainfall and 88% relative humidity across the period.
August is one of the cooler months of the year in Blenheim. Across 45 years of records, the warmest August in Blenheim was 2020 — when the month averaged 8.3°C — while the coldest was 1992 at 5.2°C. Typical August days reach 10.3°C with nights near 3.4°C. The long-term trend is warming, about 0.2°C per decade.
August is about average for rainfall in Blenheim, averaging 76 mm of rainfall. The wettest August on record was 2022 with 186 mm, while the driest was 1982 at 21 mm.
Relative humidity in Blenheim during August averages 88%. The most humid August was 2017 at 92%, and the least humid was 1982 at 85%.
August receives about 2.7 kWh/m²/day of solar energy in Blenheim. The sunniest August was 1993 at 3.1 kWh/m²/day, and the cloudiest was 2013 at 2.3.
Average wind speed in Blenheim during August is 2.1 m/s. The windiest August was 2022 at 2.7 m/s, while the calmest were 1987, 1993 and 2012 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.7°C | 6.3°C | 7.0°C | 7.1°C | 7.2°C | +0.5°C |
| Avg High | 10.2°C | 9.9°C | 10.5°C | 10.4°C | 10.6°C | +0.4°C |
| Avg Low | 3.2°C | 2.7°C | 3.5°C | 3.8°C | 3.7°C | +0.5°C |
| Avg Rain | 64 mm | 90 mm | 57 mm | 77 mm | 101 mm | +37 mm |
August temperatures in Blenheim have risen by about 0.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -2.6°C (2016) to a record high of 16.6°C (2006).
Rainfall in August is about average for rainfall, averaging 76 mm, with a wettest year of 186 mm.
A quieter season to visit Blenheim
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Blenheim. That said, August — with days averaging 10.3°C and nights around 3.4°C (mean 6.9°C) and moderate rainfall (76 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 10.2°C | 6.4°C | 2.5°C | 12.7°C | -0.2°C | 43 mm | 89% | 2.1 m/s | 3 |
| 2024 | 11.2°C | 7.5°C | 3.8°C | 14.9°C | -0.8°C | 115 mm | 90% | 2.3 m/s | 2.7 |
| 2023 | 10.0°C | 6.2°C | 2.4°C | 13.3°C | -0.7°C | 59 mm | 88% | 1.9 m/s | 3 |
| 2022 🌧️ | 10.6°C | 7.8°C | 5.0°C | 14.6°C | -1.2°C | 186 mm | 92% | 2.7 m/s | 2.5 |
| 2021 | 10.0°C | 6.7°C | 3.4°C | 13.6°C | -2.5°C | 139 mm | 90% | 2.4 m/s | 2.5 |
| 2020 🔥 | 11.6°C | 8.3°C | 5.0°C | 15.1°C | 1.3°C | 65 mm | 89% | 1.9 m/s | 2.8 |
| 2019 | 10.4°C | 6.6°C | 2.8°C | 13.9°C | -0.3°C | 65 mm | 88% | 2.2 m/s | 2.8 |
| 2018 | 11.1°C | 7.9°C | 4.8°C | 13.5°C | 2.1°C | 94 mm | 91% | 1.8 m/s | 2.5 |
| 2017 | 10.7°C | 7.8°C | 4.9°C | 15.2°C | -0.8°C | 105 mm | 92% | 2.3 m/s | 2.5 |
| 2016 | 9.4°C | 6.0°C | 2.6°C | 15.1°C | -2.6°C | 77 mm | 91% | 1.8 m/s | 2.8 |
| 2015 | 9.6°C | 6.3°C | 3.0°C | 15.0°C | -0.9°C | 62 mm | 90% | 2.3 m/s | 2.6 |
| 2014 | 10.3°C | 6.6°C | 3.0°C | 13.3°C | -0.8°C | 34 mm | 86% | 2.2 m/s | 2.8 |
| 2013 | 11.0°C | 8.1°C | 5.2°C | 14.5°C | 1.6°C | 55 mm | 91% | 2.1 m/s | 2.3 |
| 2012 | 10.7°C | 7.8°C | 5.0°C | 12.7°C | 2.6°C | 122 mm | 91% | 1.7 m/s | 2.4 |
| 2011 | 10.1°C | 6.1°C | 2.2°C | 14.5°C | -2.5°C | 47 mm | 87% | 1.9 m/s | 3 |
| 2010 | 10.5°C | 7.5°C | 4.4°C | 13.0°C | -0.2°C | 107 mm | 90% | 2.1 m/s | 2.5 |
| 2009 | 11.5°C | 8.2°C | 4.8°C | 14.3°C | -0.1°C | 75 mm | 88% | 2.4 m/s | 2.5 |
| 2008 | 9.5°C | 6.2°C | 2.9°C | 14.1°C | -1.6°C | 97 mm | 88% | 2 m/s | 2.5 |
| 2007 | 10.8°C | 6.9°C | 3.1°C | 14.3°C | 0.1°C | 42 mm | 87% | 1.9 m/s | 2.8 |
| 2006 | 10.1°C | 6.5°C | 2.9°C | 16.6°C | -1.0°C | 70 mm | 87% | 2 m/s | 2.8 |
| 2005 | 11.8°C | 8.1°C | 4.5°C | 14.9°C | -0.3°C | 27 mm | 89% | 2 m/s | 2.9 |
| 2004 | 8.8°C | 5.5°C | 2.2°C | 11.8°C | -2.0°C | 65 mm | 86% | 2.5 m/s | 2.7 |
| 2003 | 10.0°C | 7.1°C | 4.1°C | 12.2°C | 0.8°C | 49 mm | 90% | 2.3 m/s | 2.6 |
| 2002 | 10.8°C | 7.1°C | 3.4°C | 13.8°C | -0.4°C | 48 mm | 85% | 2.2 m/s | 2.7 |
| 2001 | 11.1°C | 7.7°C | 4.3°C | 13.6°C | 0.3°C | 48 mm | 86% | 2.3 m/s | 2.5 |
| 2000 | 10.5°C | 6.8°C | 3.2°C | 14.1°C | -0.7°C | 52 mm | 87% | 1.9 m/s | 2.5 |
| 1999 | 10.6°C | 6.7°C | 2.9°C | 15.2°C | -1.3°C | 55 mm | 88% | 1.8 m/s | 2.7 |
| 1998 | 9.8°C | 6.4°C | 3.0°C | 12.9°C | -0.5°C | 69 mm | 87% | 2.1 m/s | 2.7 |
| 1997 | 9.6°C | 5.9°C | 2.2°C | 14.6°C | -1.2°C | 58 mm | 88% | 2.5 m/s | 2.7 |
| 1996 | 9.7°C | 5.8°C | 1.8°C | 11.7°C | -1.6°C | 77 mm | 87% | 1.9 m/s | 2.8 |
| 1995 | 9.7°C | 6.0°C | 2.4°C | 13.7°C | -1.1°C | 126 mm | 87% | 2.2 m/s | 2.7 |
| 1994 | 10.7°C | 6.8°C | 3.0°C | 15.1°C | -0.8°C | 63 mm | 88% | 2.1 m/s | 2.9 |
| 1993 | 9.8°C | 5.9°C | 1.9°C | 13.7°C | -0.9°C | 66 mm | 86% | 1.7 m/s | 3.1 |
| 1992 ❄️ | 8.6°C | 5.2°C | 1.7°C | 11.3°C | -1.9°C | 120 mm | 87% | 2.4 m/s | 2.7 |
| 1991 | 10.5°C | 7.1°C | 3.7°C | 12.9°C | -0.2°C | 84 mm | 89% | 2.3 m/s | 2.4 |
| 1990 | 9.8°C | 6.9°C | 4.0°C | 12.9°C | 1.1°C | 182 mm | 91% | 2.1 m/s | 2.5 |
| 1989 | 10.0°C | 7.0°C | 4.0°C | 13.8°C | 0.2°C | 87 mm | 90% | 2.1 m/s | 2.6 |
| 1988 | 10.5°C | 6.7°C | 2.8°C | 13.2°C | -0.9°C | 46 mm | 87% | 2.1 m/s | 2.6 |
| 1987 | 11.5°C | 8.0°C | 4.4°C | 13.2°C | 0.1°C | 60 mm | 90% | 1.7 m/s | 2.7 |
| 1986 | 8.9°C | 5.6°C | 2.4°C | 13.3°C | -1.1°C | 97 mm | 88% | 2.1 m/s | 2.8 |
| 1985 | 9.9°C | 6.3°C | 2.7°C | 13.5°C | -0.5°C | 76 mm | 88% | 1.9 m/s | 2.9 |
| 1984 | 10.4°C | 7.4°C | 4.4°C | 13.0°C | -0.9°C | 56 mm | 89% | 2.1 m/s | 2.4 |
| 1983 | 10.7°C | 7.0°C | 3.3°C | 14.5°C | -0.7°C | 56 mm | 88% | 2 m/s | — |
| 1982 | 11.2°C | 7.0°C | 2.8°C | 14.5°C | -0.6°C | 21 mm | 85% | 2.1 m/s | — |
| 1981 | 8.8°C | 5.4°C | 2.1°C | 12.1°C | -0.2°C | 80 mm | 89% | 2 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 10.3°C with lows near 3.4°C (mean 6.9°C), based on 45 years of NASA POWER data.
August averages 76 mm of rainfall in Blenheim, about average for rainfall. The wettest on record was 186 mm in 2022.
The hottest August reached 16.6°C in 2006. The coldest dipped to -2.6°C in 2016.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.3°C. Daytime highs moved from 10.2°C to 10.4°C and overnight lows from 3.1°C to 3.4°C over the same span.
August is one of the cooler months of the year in Blenheim and about average for rainfall, so plan for around 10.3°C daytime highs and 3.4°C at night.
Not quite — August is the 2nd coolest month in Blenheim, averaging 6.9°C.
For August in Blenheim, pack warm layers and a jacket for chilly mornings, with typical highs of 10.3°C and lows of 3.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 88% — quite humid.
Average wind speed in August is 2.1 m/s. The windiest August on record averaged 2.7 m/s (2022).
The wettest August on record was 2022 with 186 mm. On average, August sees 76 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 Blenheim 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.
