August is one of the cooler months of the year in Northam, with average highs near 17°C and lows around 5.8°C (mean 11.4°C). It is a relatively wet time of year, averaging 66 mm of rainfall and 81% relative humidity across the period.
August is one of the cooler months of the year in Northam. Across 45 years of records, the warmest August in Northam was 2014 — when the month averaged 14.2°C — while the coldest was 1986 at 9.4°C. Typical August days reach 17°C with nights near 5.8°C. The long-term trend is warming, about 0.3°C per decade.
August is a relatively wet time of year in Northam, averaging 66 mm of rainfall. The wettest August on record was 2025 with 155 mm, while the driest was 2008 at 14 mm.
Relative humidity in Northam during August averages 81%. The most humid August was 2009 at 86%, and the least humid was 2010 at 72%.
August receives about 3.8 kWh/m²/day of solar energy in Northam. The sunniest August was 2008 at 4.3 kWh/m²/day, and the cloudiest was 1998 at 3.5.
Average wind speed in Northam during August is 2.6 m/s. The windiest August was 1992 at 3.1 m/s, while the calmest was 2023 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.0°C | 11.2°C | 11.3°C | 12.1°C | 11.7°C | +0.7°C |
| Avg High | 16.6°C | 16.6°C | 17.0°C | 17.9°C | 17.2°C | +0.6°C |
| Avg Low | 5.4°C | 5.8°C | 5.6°C | 6.3°C | 6.2°C | +0.8°C |
| Avg Rain | 61 mm | 67 mm | 63 mm | 60 mm | 87 mm | +26 mm |
August temperatures in Northam have risen by about 0.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of -0.6°C (1992) to a record high of 28.4°C (2023).
Rainfall in August is a relatively wet time of year, averaging 66 mm, with a wettest year of 155 mm.
A quieter season to visit Northam
If your dates are flexible, the more temperate months of November and March tend to be the most comfortable for visiting Northam. That said, August — with days averaging 17°C and nights around 5.8°C (mean 11.4°C) and moderate rainfall (66 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 🌧️ | 16.6°C | 11.2°C | 5.8°C | 22.8°C | 1.8°C | 155 mm | 83% | 2.6 m/s | 3.8 |
| 2024 | 17.5°C | 12.5°C | 7.5°C | 23.0°C | 1.9°C | 78 mm | 84% | 2.9 m/s | 3.7 |
| 2023 | 19.5°C | 12.9°C | 6.3°C | 28.4°C | 1.2°C | 34 mm | 80% | 2 m/s | 4 |
| 2022 | 16.1°C | 10.7°C | 5.4°C | 21.1°C | 2.4°C | 127 mm | 83% | 2.8 m/s | 3.8 |
| 2021 | 17.0°C | 11.4°C | 5.9°C | 23.7°C | 2.0°C | 51 mm | 82% | 2.5 m/s | 3.8 |
| 2020 | 16.6°C | 11.5°C | 6.4°C | 23.6°C | 3.4°C | 76 mm | 82% | 2.7 m/s | 3.9 |
| 2019 | 18.5°C | 12.1°C | 5.6°C | 27.1°C | 2.4°C | 59 mm | 75% | 2.6 m/s | 4.1 |
| 2018 | 15.9°C | 10.8°C | 5.7°C | 22.6°C | 2.6°C | 94 mm | 83% | 2.8 m/s | 3.9 |
| 2017 | 17.1°C | 11.6°C | 6.1°C | 23.3°C | 0.6°C | 68 mm | 82% | 2.7 m/s | 3.6 |
| 2016 | 15.6°C | 10.2°C | 4.8°C | 22.2°C | 0.3°C | 71 mm | 82% | 2.7 m/s | 3.6 |
| 2015 | 17.0°C | 11.8°C | 6.6°C | 23.2°C | 2.8°C | 47 mm | 82% | 2.5 m/s | 3.7 |
| 2014 🔥 | 20.4°C | 14.2°C | 8.0°C | 24.1°C | 2.3°C | 43 mm | 76% | 2.5 m/s | 3.9 |
| 2013 | 18.7°C | 13.3°C | 7.9°C | 24.6°C | 4.8°C | 81 mm | 81% | 2.7 m/s | 3.7 |
| 2012 | 19.0°C | 12.7°C | 6.5°C | 24.1°C | 2.7°C | 42 mm | 76% | 2.3 m/s | 3.9 |
| 2011 | 18.1°C | 12.3°C | 6.5°C | 24.2°C | 2.5°C | 59 mm | 81% | 2.6 m/s | 4.1 |
| 2010 | 18.3°C | 11.6°C | 4.8°C | 23.9°C | 1.4°C | 39 mm | 72% | 2.2 m/s | 4.1 |
| 2009 | 17.3°C | 12.3°C | 7.3°C | 20.9°C | 3.3°C | 81 mm | 86% | 2.5 m/s | 3.6 |
| 2008 | 17.0°C | 10.5°C | 3.9°C | 20.6°C | 1.6°C | 14 mm | 75% | 2.5 m/s | 4.3 |
| 2007 | 17.4°C | 11.7°C | 5.9°C | 21.5°C | 1.8°C | 60 mm | 82% | 2.5 m/s | 3.8 |
| 2006 | 19.8°C | 13.5°C | 7.3°C | 27.8°C | 1.8°C | 72 mm | 77% | 2.8 m/s | 3.9 |
| 2005 | 16.5°C | 10.9°C | 5.3°C | 21.4°C | 1.0°C | 62 mm | 82% | 2.5 m/s | 3.6 |
| 2004 | 15.4°C | 10.4°C | 5.4°C | 19.8°C | 1.7°C | 74 mm | 82% | 2.8 m/s | 3.9 |
| 2003 | 16.2°C | 11.1°C | 6.1°C | 19.9°C | 2.4°C | 85 mm | 82% | 2.5 m/s | 3.8 |
| 2002 | 17.2°C | 11.0°C | 4.9°C | 23.4°C | 0.4°C | 48 mm | 78% | 2.6 m/s | 3.9 |
| 2001 | 17.0°C | 11.0°C | 5.0°C | 22.4°C | 1.2°C | 57 mm | 80% | 2.2 m/s | 3.9 |
| 2000 | 15.9°C | 10.2°C | 4.6°C | 20.3°C | 1.0°C | 74 mm | 80% | 2.6 m/s | 3.7 |
| 1999 | 16.7°C | 11.1°C | 5.4°C | 21.7°C | 0.6°C | 70 mm | 82% | 2.8 m/s | 3.9 |
| 1998 | 18.0°C | 13.0°C | 8.1°C | 25.2°C | 2.2°C | 77 mm | 84% | 2.7 m/s | 3.5 |
| 1997 | 16.9°C | 11.1°C | 5.2°C | 21.6°C | 1.0°C | 77 mm | 79% | 2.5 m/s | 4 |
| 1996 | 15.8°C | 10.7°C | 5.6°C | 21.6°C | 1.0°C | 63 mm | 84% | 2.6 m/s | 3.7 |
| 1995 | 17.1°C | 11.4°C | 5.7°C | 25.4°C | 2.1°C | 40 mm | 83% | 2.7 m/s | 3.9 |
| 1994 | 18.5°C | 12.4°C | 6.4°C | 25.7°C | 2.8°C | 57 mm | 77% | 2.5 m/s | 3.9 |
| 1993 | 16.2°C | 10.6°C | 5.0°C | 22.6°C | 1.1°C | 72 mm | 83% | 2.7 m/s | 3.9 |
| 1992 | 15.2°C | 10.7°C | 6.2°C | 21.2°C | -0.6°C | 121 mm | 85% | 3.1 m/s | 3.6 |
| 1991 | 16.6°C | 11.3°C | 6.0°C | 22.9°C | 2.2°C | 45 mm | 81% | 2.9 m/s | 3.9 |
| 1990 | 15.1°C | 9.9°C | 4.8°C | 18.5°C | -0.2°C | 52 mm | 82% | 2.9 m/s | 3.6 |
| 1989 | 16.7°C | 10.6°C | 4.4°C | 21.5°C | 1.2°C | 35 mm | 76% | 2.3 m/s | 4 |
| 1988 | 16.6°C | 11.2°C | 5.8°C | 22.1°C | 2.0°C | 68 mm | 82% | 2.8 m/s | 3.7 |
| 1987 | 17.5°C | 11.1°C | 4.7°C | 24.0°C | 0.1°C | 53 mm | 75% | 2.4 m/s | 3.8 |
| 1986 ❄️ | 14.8°C | 9.4°C | 4.1°C | 20.4°C | 1.3°C | 59 mm | 85% | 2.4 m/s | 3.8 |
| 1985 | 16.3°C | 11.0°C | 5.7°C | 21.9°C | 0.6°C | 69 mm | 81% | 2.9 m/s | 3.8 |
| 1984 | 15.9°C | 10.7°C | 5.5°C | 20.5°C | 2.0°C | 58 mm | 83% | 2.6 m/s | 3.9 |
| 1983 | 17.7°C | 12.2°C | 6.8°C | 22.7°C | 0.3°C | 63 mm | 83% | 2.9 m/s | — |
| 1982 | 18.3°C | 12.3°C | 6.3°C | 25.1°C | 1.0°C | 72 mm | 82% | 2.4 m/s | — |
| 1981 | 15.3°C | 10.4°C | 5.5°C | 18.8°C | 0.6°C | 70 mm | 84% | 2.9 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 17°C with lows near 5.8°C (mean 11.4°C), based on 45 years of NASA POWER data.
August averages 66 mm of rainfall in Northam, a relatively wet time of year. The wettest on record was 155 mm in 2025.
The hottest August reached 28.4°C in 2023. The coldest dipped to -0.6°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.4°C. Daytime highs moved from 16.7°C to 17.3°C and overnight lows from 6°C to 6.2°C over the same span.
August is one of the cooler months of the year in Northam and a relatively wet time of year, so plan for around 17°C daytime highs and 5.8°C at night.
Not quite — August is the 2nd coolest month in Northam, averaging 11.4°C.
For August in Northam, pack warm layers and a jacket for chilly mornings, with typical highs of 17°C and lows of 5.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 81% — quite humid.
Average wind speed in August is 2.6 m/s. The windiest August on record averaged 3.1 m/s (1992).
The wettest August on record was 2025 with 155 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 Northam 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.
