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Monthly climate in Onslow, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Onslow features a hot desert climate (BWh). Temperatures typically range between 20 °C (68 °F) and 31 °C (88 °F) through the year, but rarely can drop to 9 °C (48 °F) or can rise to as high as 47 °C (116 °F). The average annual precipitation amounts to about 149 mm (5.9 inches) and receives 12 rainy days on the 1 mm (0.04 inches) threshold annually. Onslow enjoys an average of 3753 hours of sunshine throughout the year, and daylight varies from 10 hours 49 minutes to 13 hours 24 minutes per day.

Monthly average temperatures in Onslow, Australia

The warmest months in Onslow are January, February and March, with daily mean temperatures ranging from 30 to 31 °C (87 - 88 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 20 to 21 °C (68 - 70 °F) throughout the day. On average each year, Onslow experiences 304 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Onslow. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum47°C
(116°F)		44°C
(111°F)		45°C
(113°F)		41°C
(105°F)		36°C
(97°F)		32°C
(89°F)		32°C
(90°F)		35°C
(95°F)		38°C
(100°F)		40°C
(105°F)		41°C
(107°F)		47°C
(116°F)
Mean maximum43°C
(110°F)		41°C
(106°F)		42°C
(108°F)		39°C
(102°F)		34°C
(94°F)		28°C
(82°F)		30°C
(86°F)		32°C
(89°F)		36°C
(97°F)		37°C
(100°F)		40°C
(104°F)		44°C
(112°F)
Average high36°C
(97°F)		35°C
(95°F)		36°C
(97°F)		34°C
(93°F)		30°C
(86°F)		26°C
(78°F)		26°C
(80°F)		27°C
(81°F)		30°C
(86°F)		31°C
(89°F)		33°C
(92°F)		36°C
(97°F)
Daily mean31°C
(88°F)		30°C
(87°F)		31°C
(88°F)		29°C
(84°F)		24°C
(76°F)		20°C
(69°F)		20°C
(68°F)		21°C
(70°F)		24°C
(75°F)		25°C
(78°F)		27°C
(81°F)		30°C
(86°F)
Average low27°C
(80°F)		26°C
(80°F)		27°C
(80°F)		24°C
(75°F)		19°C
(66°F)		16°C
(61°F)		15°C
(59°F)		15°C
(59°F)		17°C
(63°F)		19°C
(66°F)		21°C
(70°F)		24°C
(76°F)
Mean minimum23°C
(74°F)		22°C
(73°F)		24°C
(75°F)		20°C
(68°F)		14°C
(58°F)		11°C
(53°F)		11°C
(52°F)		11°C
(52°F)		14°C
(57°F)		15°C
(60°F)		18°C
(64°F)		21°C
(70°F)
Minimum22°C
(72°F)		21°C
(70°F)		22°C
(72°F)		18°C
(64°F)		12°C
(54°F)		9°C
(48°F)		9°C
(49°F)		10°C
(50°F)		12°C
(54°F)		13°C
(56°F)		17°C
(62°F)		19°C
(67°F)

Compare climate in Onslow with other places

Compare temperature, precipitation, sunshine, UV index in Onslow, Australia with other places around the world.

Monthly average precipitation in Onslow, Australia

Onslow usually has the most precipitation in February, March and June, with an average of 2 rainy days and 33 mm (1.3 inches) of precipitation per month. The driest months in Onslow are September, October and December. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Onslow. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)10 (0.4)25 (1.0)37 (1.5)15 (0.6)18 (0.7)36 (1.4)3 (0.1)2 (0.1)0 (0.0)0 (0.0)2 (0.1)1 (0.0)
Average precipitation days (≥ 1 mm)232113000000

Monthly sunshine hours in Onslow, Australia

The sunniest months in Onslow are October, November and December, when the sun shines an average of 11 hours 23 minutes a day. Least sunny months in Onslow: January, May and June receive an average of 9 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Onslow. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours286306325299296271298308313342346359
Mean daily daylight hours13h 16m12h 47m12h 11m11h 34m11h 3m10h 49m10h 56m11h 22m11h 57m12h 35m13h 7m13h 24m

Solar UV radiation in Onslow, Australia

Onslow experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 15 - 15, which corresponds to the Extreme category of sun exposure. May, June and July are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 8. For more detailed information, check out our hourly Onslow UV Index data.

Average daily maximum UV levels by month for Onslow. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)151513118781013141515