August is one of the cooler months of the year in Newcastle, with average highs near 17.6°C and lows around 12.1°C (mean 14.9°C). It is one of the drier months, averaging 60 mm of rainfall and 71% relative humidity across the period.
August is one of the cooler months of the year in Newcastle. Across 45 years of records, the warmest August in Newcastle was 2024 — when the month averaged 17°C — while the coldest were 1989 and 1990 at 13°C. Typical August days reach 17.6°C with nights near 12.1°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Newcastle, averaging 60 mm of rainfall. The wettest August on record was 1998 with 223 mm, while the driest was 1995 at 3 mm.
Relative humidity in Newcastle during August averages 71%. The most humid August was 1987 at 80%, and the least humid was 2018 at 62%.
August receives about 3.8 kWh/m²/day of solar energy in Newcastle. The sunniest Augusts were 1995, 2009 and 2013, among others at 4.2 kWh/m²/day, and the cloudiest were 1998, 2014 and 2025, among others at 3.3.
Average wind speed in Newcastle during August is 3.1 m/s. The windiest August was 1990 at 3.8 m/s, while the calmest was 1982 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.1°C | 14.6°C | 15.0°C | 15.1°C | 15.6°C | +1.5°C |
| Avg High | 16.8°C | 17.3°C | 17.8°C | 17.9°C | 18.3°C | +1.5°C |
| Avg Low | 11.3°C | 11.8°C | 12.2°C | 12.4°C | 13.0°C | +1.7°C |
| Avg Rain | 61 mm | 76 mm | 53 mm | 49 mm | 64 mm | +3 mm |
August temperatures in Newcastle have risen by about 1.7°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 7.2°C (2015) to a record high of 25.5°C (1995).
Rainfall in August is one of the drier months, averaging 60 mm, with a wettest year of 223 mm.
A quieter season to visit Newcastle
If your dates are flexible, the more temperate months of December and March tend to be the most comfortable for visiting Newcastle. That said, August — with days averaging 17.6°C and nights around 12.1°C (mean 14.9°C) and moderate rainfall (60 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 | 17.3°C | 15.4°C | 13.5°C | 20.9°C | 10.1°C | 190 mm | 78% | 3.3 m/s | 3.3 |
| 2024 🔥 | 19.5°C | 17.0°C | 14.6°C | 25.2°C | 10.5°C | 37 mm | 73% | 2.6 m/s | 3.4 |
| 2023 | 19.2°C | 16.3°C | 13.5°C | 22.8°C | 11.3°C | 42 mm | 71% | 2.5 m/s | 3.9 |
| 2022 | 17.4°C | 15.0°C | 12.6°C | 20.2°C | 9.7°C | 53 mm | 78% | 3.2 m/s | 3.4 |
| 2021 | 19.0°C | 15.7°C | 12.4°C | 23.0°C | 9.7°C | 31 mm | 68% | 2.9 m/s | 3.8 |
| 2020 | 17.3°C | 14.4°C | 11.6°C | 21.0°C | 8.4°C | 34 mm | 71% | 3.2 m/s | 4 |
| 2019 | 18.7°C | 15.6°C | 12.5°C | 22.2°C | 9.5°C | 69 mm | 64% | 3.2 m/s | 4.1 |
| 2018 | 17.9°C | 14.9°C | 11.8°C | 21.6°C | 8.8°C | 13 mm | 62% | 3.2 m/s | 4.1 |
| 2017 | 18.5°C | 15.7°C | 12.8°C | 23.4°C | 10.9°C | 13 mm | 62% | 3.5 m/s | 4.1 |
| 2016 | 18.1°C | 15.4°C | 12.6°C | 21.5°C | 9.6°C | 47 mm | 69% | 2.8 m/s | 3.6 |
| 2015 | 18.0°C | 15.0°C | 12.1°C | 22.7°C | 7.2°C | 40 mm | 70% | 2.8 m/s | 3.8 |
| 2014 | 17.1°C | 15.0°C | 13.0°C | 19.4°C | 9.8°C | 154 mm | 74% | 3.2 m/s | 3.3 |
| 2013 | 19.0°C | 15.8°C | 12.7°C | 24.5°C | 9.1°C | 14 mm | 65% | 3.2 m/s | 4.2 |
| 2012 | 17.6°C | 14.6°C | 11.7°C | 23.1°C | 9.4°C | 37 mm | 66% | 3.4 m/s | 4.1 |
| 2011 | 17.4°C | 15.0°C | 12.6°C | 20.2°C | 9.1°C | 61 mm | 78% | 2.7 m/s | 3.4 |
| 2010 | 16.7°C | 14.2°C | 11.8°C | 20.1°C | 9.7°C | 40 mm | 71% | 3.7 m/s | 4 |
| 2009 | 19.6°C | 16.1°C | 12.6°C | 24.8°C | 9.5°C | 3 mm | 63% | 2.7 m/s | 4.2 |
| 2008 | 16.1°C | 13.1°C | 10.2°C | 19.3°C | 7.3°C | 32 mm | 70% | 3.3 m/s | 3.8 |
| 2007 | 17.4°C | 15.1°C | 12.8°C | 20.8°C | 8.8°C | 112 mm | 77% | 3.1 m/s | 3.5 |
| 2006 | 17.9°C | 15.5°C | 13.1°C | 21.8°C | 9.5°C | 94 mm | 70% | 3 m/s | 3.7 |
| 2005 | 18.0°C | 14.9°C | 11.8°C | 23.6°C | 8.3°C | 6 mm | 66% | 3 m/s | 4.1 |
| 2004 | 18.2°C | 15.4°C | 12.5°C | 23.1°C | 9.6°C | 85 mm | 67% | 3.2 m/s | 3.8 |
| 2003 | 17.6°C | 14.9°C | 12.3°C | 21.1°C | 9.7°C | 55 mm | 70% | 3.1 m/s | 3.7 |
| 2002 | 18.4°C | 15.6°C | 12.9°C | 22.8°C | 10.5°C | 52 mm | 68% | 3.1 m/s | 3.6 |
| 2001 | 17.3°C | 14.6°C | 11.9°C | 20.6°C | 9.7°C | 53 mm | 71% | 3.5 m/s | 3.7 |
| 2000 | 17.5°C | 14.9°C | 12.3°C | 19.9°C | 9.9°C | 38 mm | 70% | 3.2 m/s | 3.6 |
| 1999 | 17.1°C | 15.0°C | 12.8°C | 20.2°C | 10.0°C | 81 mm | 77% | 3 m/s | 3.7 |
| 1998 🌧️ | 17.3°C | 15.5°C | 13.6°C | 20.1°C | 9.0°C | 223 mm | 79% | 3.1 m/s | 3.3 |
| 1997 | 17.1°C | 14.3°C | 11.5°C | 21.0°C | 8.4°C | 31 mm | 70% | 3.1 m/s | 4 |
| 1996 | 17.8°C | 14.7°C | 11.5°C | 22.2°C | 8.5°C | 97 mm | 68% | 3.2 m/s | 3.7 |
| 1995 | 19.4°C | 16.0°C | 12.5°C | 25.5°C | 7.6°C | 3 mm | 68% | 2.7 m/s | 4.2 |
| 1994 | 17.0°C | 14.3°C | 11.6°C | 22.0°C | 8.4°C | 43 mm | 68% | 3 m/s | 4.1 |
| 1993 | 17.2°C | 14.5°C | 11.8°C | 20.5°C | 9.5°C | 59 mm | 75% | 2.7 m/s | 3.8 |
| 1992 | 17.0°C | 14.1°C | 11.3°C | 21.8°C | 8.6°C | 43 mm | 69% | 3.3 m/s | 3.7 |
| 1991 | 17.3°C | 14.3°C | 11.3°C | 20.5°C | 9.6°C | 9 mm | 64% | 3.6 m/s | 4.2 |
| 1990 | 15.5°C | 13.0°C | 10.5°C | 18.8°C | 8.4°C | 167 mm | 76% | 3.8 m/s | 3.5 |
| 1989 ❄️ | 15.5°C | 13.0°C | 10.6°C | 18.4°C | 7.5°C | 30 mm | 74% | 3.4 m/s | 4 |
| 1988 | 16.9°C | 14.4°C | 11.8°C | 21.3°C | 8.4°C | 64 mm | 77% | 3 m/s | 3.6 |
| 1987 | 17.0°C | 14.7°C | 12.5°C | 20.4°C | 8.7°C | 176 mm | 80% | 2.8 m/s | 3.3 |
| 1986 | 16.3°C | 13.6°C | 10.8°C | 20.4°C | 7.3°C | 145 mm | 73% | 3.2 m/s | 3.8 |
| 1985 | 16.1°C | 13.6°C | 11.1°C | 19.6°C | 8.3°C | 42 mm | 73% | 3 m/s | 3.7 |
| 1984 | 16.9°C | 13.9°C | 10.9°C | 19.3°C | 7.9°C | 15 mm | 71% | 3.3 m/s | 4 |
| 1983 | 16.6°C | 14.1°C | 11.6°C | 19.4°C | 9.1°C | 53 mm | 75% | 2.9 m/s | — |
| 1982 | 18.7°C | 15.4°C | 12.1°C | 24.6°C | 8.9°C | 13 mm | 70% | 2.3 m/s | — |
| 1981 | 16.8°C | 13.8°C | 10.7°C | 19.9°C | 8.5°C | 13 mm | 65% | 3.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 17.6°C with lows near 12.1°C (mean 14.9°C), based on 45 years of NASA POWER data.
August averages 60 mm of rainfall in Newcastle, one of the drier months. The wettest on record was 223 mm in 1998.
The hottest August reached 25.5°C in 1995. The coldest dipped to 7.2°C in 2015.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.7°C. Daytime highs moved from 17°C to 18.5°C and overnight lows from 11.3°C to 13.3°C over the same span.
August is one of the cooler months of the year in Newcastle and one of the drier months, so plan for around 17.6°C daytime highs and 12.1°C at night.
Not quite — August is the 2nd coolest month in Newcastle, averaging 14.9°C.
For August in Newcastle, pack light layers you can adjust through the day, with typical highs of 17.6°C and lows of 12.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 71% — moderately humid.
Average wind speed in August is 3.1 m/s. The windiest August on record averaged 3.8 m/s (1990).
The wettest August on record was 1998 with 223 mm. On average, August sees 60 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 Newcastle 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.
