July is one of the cooler months of the year in Onslow, with average highs near 24.1°C and lows around 18°C (mean 21.1°C). It is about average for rainfall, averaging 17 mm of rainfall and 61% relative humidity across the period.
July is one of the cooler months of the year in Onslow. Across 45 years of records, the warmest July in Onslow was 2020 — when the month averaged 22.4°C — while the coldest was 1986 at 19.3°C. Typical July days reach 24.1°C with nights near 18°C. The long-term July temperature trend is broadly flat.
July is about average for rainfall in Onslow, averaging 17 mm of rainfall. The wettest July on record was 2016 with 116 mm, while the driest were 2006, 2014 and 2022 at 0 mm.
Relative humidity in Onslow during July averages 61%. The most humid July was 2016 at 72%, and the least humid was 1994 at 52%.
July receives about 4.3 kWh/m²/day of solar energy in Onslow. The sunniest Julys were 2017 and 2018 at 4.8 kWh/m²/day, and the cloudiest was 1984 at 3.5.
Average wind speed in Onslow during July is 4.3 m/s. The windiest July was 1997 at 5.2 m/s, while the calmest was 2020 at 3.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.1°C | 21.1°C | 21.2°C | 20.8°C | 21.0°C | -0.1°C |
| Avg High | 24.1°C | 24.0°C | 24.2°C | 23.9°C | 24.0°C | -0.1°C |
| Avg Low | 18.0°C | 18.1°C | 18.1°C | 17.7°C | 17.9°C | -0.1°C |
| Avg Rain | 15 mm | 24 mm | 18 mm | 17 mm | 5 mm | -9 mm |
July temperatures in Onslow have fallen by about 0.3°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 12.6°C (2006) to a record high of 27.9°C (2020).
Rainfall in July is about average for rainfall, averaging 17 mm, with a wettest year of 116 mm.
One of the best times to visit Onslow
July is one of the best times to visit Onslow. Expect days averaging 24.1°C and nights around 18°C (mean 21.1°C) — cooler than Onslow's yearly average — with low rainfall (17 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 | 23.3°C | 20.3°C | 17.3°C | 25.5°C | 13.4°C | 4 mm | 59% | 4.5 m/s | 4.7 |
| 2024 | 24.3°C | 21.4°C | 18.4°C | 26.4°C | 14.3°C | 13 mm | 61% | 4 m/s | 4.7 |
| 2023 | 23.4°C | 19.7°C | 16.1°C | 25.4°C | 14.4°C | 8 mm | 58% | 4.2 m/s | 4.7 |
| 2022 | 23.5°C | 20.4°C | 17.4°C | 26.3°C | 14.6°C | 0 mm | 61% | 3.6 m/s | 4.7 |
| 2021 | 24.2°C | 21.5°C | 18.9°C | 26.2°C | 16.5°C | 2 mm | 64% | 3.9 m/s | 4.4 |
| 2020 🔥 | 25.6°C | 22.4°C | 19.2°C | 27.9°C | 17.3°C | 6 mm | 57% | 3.4 m/s | 4.6 |
| 2019 | 24.6°C | 21.3°C | 17.9°C | 26.4°C | 15.1°C | 14 mm | 60% | 3.8 m/s | 4.4 |
| 2018 | 23.7°C | 20.6°C | 17.5°C | 26.1°C | 14.7°C | 1 mm | 63% | 4 m/s | 4.8 |
| 2017 | 24.4°C | 20.7°C | 17.0°C | 26.7°C | 14.7°C | 0 mm | 57% | 4.4 m/s | 4.8 |
| 2016 🌧️ | 23.4°C | 21.0°C | 18.5°C | 26.1°C | 14.8°C | 116 mm | 72% | 4.9 m/s | 3.8 |
| 2015 | 24.5°C | 21.4°C | 18.3°C | 26.9°C | 15.9°C | 10 mm | 62% | 4.2 m/s | 3.9 |
| 2014 | 23.4°C | 19.9°C | 16.5°C | 27.5°C | 13.8°C | 0 mm | 57% | 3.9 m/s | 4.5 |
| 2013 | 23.5°C | 20.4°C | 17.3°C | 25.3°C | 13.6°C | 3 mm | 64% | 4.3 m/s | 4.4 |
| 2012 | 23.7°C | 20.5°C | 17.3°C | 26.0°C | 14.6°C | 1 mm | 54% | 4 m/s | 4.5 |
| 2011 | 23.4°C | 20.9°C | 18.4°C | 25.1°C | 15.8°C | 23 mm | 69% | 3.9 m/s | 3.9 |
| 2010 | 24.5°C | 21.4°C | 18.2°C | 26.2°C | 15.4°C | 2 mm | 56% | 4.6 m/s | 4 |
| 2009 | 23.9°C | 20.9°C | 17.9°C | 26.4°C | 15.4°C | 4 mm | 62% | 4.2 m/s | 4.3 |
| 2008 | 23.7°C | 20.6°C | 17.5°C | 25.7°C | 14.0°C | 4 mm | 62% | 4.2 m/s | 4.4 |
| 2007 | 24.5°C | 21.8°C | 19.2°C | 26.4°C | 16.4°C | 47 mm | 65% | 4.4 m/s | 4 |
| 2006 | 23.2°C | 19.8°C | 16.4°C | 25.5°C | 12.6°C | 0 mm | 58% | 4.2 m/s | 4.6 |
| 2005 | 24.5°C | 21.3°C | 18.0°C | 26.3°C | 15.6°C | 90 mm | 60% | 3.8 m/s | 4.5 |
| 2004 | 24.2°C | 21.8°C | 19.5°C | 25.6°C | 16.4°C | 23 mm | 67% | 4.5 m/s | 3.7 |
| 2003 | 24.6°C | 21.0°C | 17.4°C | 27.4°C | 14.7°C | 0 mm | 62% | 4.3 m/s | 4.6 |
| 2002 | 24.6°C | 21.5°C | 18.3°C | 27.0°C | 15.1°C | 1 mm | 64% | 4.3 m/s | 4.7 |
| 2001 | 24.6°C | 21.7°C | 18.8°C | 26.7°C | 16.2°C | 3 mm | 61% | 4.2 m/s | 4.4 |
| 2000 | 24.3°C | 21.2°C | 18.1°C | 26.5°C | 15.4°C | 4 mm | 64% | 4 m/s | 4.4 |
| 1999 | 24.5°C | 21.5°C | 18.5°C | 26.3°C | 15.7°C | 6 mm | 59% | 4.4 m/s | 4.4 |
| 1998 | 23.3°C | 20.8°C | 18.2°C | 25.3°C | 14.2°C | 80 mm | 69% | 5.1 m/s | 3.8 |
| 1997 | 23.7°C | 20.5°C | 17.3°C | 25.9°C | 13.1°C | 26 mm | 58% | 5.2 m/s | 4.2 |
| 1996 | 24.5°C | 22.1°C | 19.8°C | 26.3°C | 14.8°C | 30 mm | 68% | 4.5 m/s | 4.2 |
| 1995 | 23.8°C | 21.1°C | 18.3°C | 25.3°C | 15.0°C | 36 mm | 62% | 4.1 m/s | 4.2 |
| 1994 | 25.0°C | 21.3°C | 17.6°C | 26.2°C | 15.5°C | 9 mm | 52% | 3.9 m/s | 4.6 |
| 1993 | 23.5°C | 20.4°C | 17.3°C | 25.7°C | 14.8°C | 8 mm | 60% | 4.7 m/s | 4.5 |
| 1992 | 25.0°C | 21.6°C | 18.2°C | 27.0°C | 16.2°C | 1 mm | 61% | 4.2 m/s | 4.4 |
| 1991 | 24.0°C | 21.1°C | 18.3°C | 25.8°C | 16.0°C | 14 mm | 62% | 4.2 m/s | 4.4 |
| 1990 | 23.0°C | 20.3°C | 17.5°C | 24.7°C | 14.0°C | 26 mm | 61% | 4.9 m/s | 4.2 |
| 1989 | 23.6°C | 20.8°C | 17.9°C | 26.6°C | 14.7°C | 2 mm | 60% | 4.1 m/s | 4.2 |
| 1988 | 25.0°C | 22.2°C | 19.4°C | 27.5°C | 16.6°C | 20 mm | 63% | 4.5 m/s | 4.6 |
| 1987 | 25.3°C | 22.2°C | 19.1°C | 27.3°C | 16.0°C | 9 mm | 58% | 4.1 m/s | 4.3 |
| 1986 ❄️ | 22.3°C | 19.3°C | 16.4°C | 24.4°C | 13.4°C | 8 mm | 62% | 4.7 m/s | 4.4 |
| 1985 | 24.2°C | 21.4°C | 18.6°C | 26.1°C | 15.5°C | 15 mm | 61% | 3.9 m/s | 4.3 |
| 1984 | 23.7°C | 21.1°C | 18.4°C | 26.0°C | 16.4°C | 38 mm | 62% | 4.7 m/s | 3.5 |
| 1983 | 23.9°C | 20.7°C | 17.4°C | 26.7°C | 14.8°C | 18 mm | 55% | 4.5 m/s | — |
| 1982 | 24.3°C | 20.7°C | 17.1°C | 26.2°C | 14.7°C | 0 mm | 55% | 4.2 m/s | — |
| 1981 | 24.5°C | 21.1°C | 17.8°C | 26.2°C | 14.9°C | 20 mm | 57% | 4.4 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 24.1°C with lows near 18°C (mean 21.1°C), based on 45 years of NASA POWER data.
July averages 17 mm of rainfall in Onslow, about average for rainfall. The wettest on record was 116 mm in 2016.
The hottest July reached 27.9°C in 2020. The coldest dipped to 12.6°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have fallen by about 0.3°C. Daytime highs moved from 24.1°C to 23.7°C and overnight lows from 17.9°C to 17.6°C over the same span.
July is one of the cooler months of the year in Onslow and about average for rainfall, so plan for around 24.1°C daytime highs and 18°C at night.
Yes — July is the coldest month of the year in Onslow, averaging 21.1°C.
For July in Onslow, pack light layers you can adjust through the day, with typical highs of 24.1°C and lows of 18°C.
Relative humidity in July averages 61% — moderately humid.
Average wind speed in July is 4.3 m/s. The windiest July on record averaged 5.2 m/s (1997).
The wettest July on record was 2016 with 116 mm. On average, July sees 17 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 Onslow behaves each July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
