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Monthly climate in Casterton, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Casterton features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 8 °C (47 °F) and 20 °C (68 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 45 °C (113 °F). The average annual precipitation amounts to about 587 mm (23.1 inches) and receives 103 rainy days on the 1 mm (0.04 inches) threshold annually. Casterton enjoys an average of 3044 hours of sunshine throughout the year, and daylight varies from 9 hours 35 minutes to 14 hours 41 minutes per day.

Monthly average temperatures in Casterton, Australia

The warmest months in Casterton are January, February and March, with daily mean temperatures ranging from 18 to 20 °C (64 - 68 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 8 to 9 °C (47 - 48 °F) throughout the day. On average each year, Casterton experiences 69 days above 25 °C (77.0 °F) and 3 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Casterton. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum42°C
(108°F)		39°C
(102°F)		39°C
(102°F)		33°C
(92°F)		24°C
(75°F)		18°C
(65°F)		18°C
(64°F)		20°C
(69°F)		27°C
(81°F)		33°C
(91°F)		35°C
(95°F)		45°C
(113°F)
Mean maximum40°C
(104°F)		36°C
(98°F)		34°C
(93°F)		30°C
(86°F)		21°C
(71°F)		15°C
(60°F)		16°C
(62°F)		18°C
(64°F)		23°C
(74°F)		28°C
(83°F)		32°C
(90°F)		37°C
(99°F)
Average high27°C
(82°F)		25°C
(78°F)		24°C
(76°F)		20°C
(68°F)		15°C
(60°F)		13°C
(55°F)		12°C
(54°F)		13°C
(55°F)		15°C
(60°F)		18°C
(64°F)		21°C
(71°F)		24°C
(76°F)
Daily mean20°C
(68°F)		18°C
(65°F)		18°C
(64°F)		14°C
(58°F)		11°C
(52°F)		9°C
(48°F)		8°C
(47°F)		9°C
(48°F)		10°C
(51°F)		12°C
(55°F)		15°C
(60°F)		17°C
(63°F)
Average low13°C
(55°F)		12°C
(55°F)		12°C
(54°F)		9°C
(49°F)		7°C
(46°F)		5°C
(42°F)		5°C
(42°F)		5°C
(41°F)		6°C
(42°F)		7°C
(45°F)		9°C
(49°F)		10°C
(51°F)
Mean minimum7°C
(45°F)		6°C
(43°F)		6°C
(43°F)		4°C
(39°F)		2°C
(36°F)		1°C
(33°F)		0°C
(33°F)		-0°C
(32°F)		0°C
(33°F)		2°C
(35°F)		2°C
(37°F)		5°C
(41°F)
Minimum5°C
(42°F)		4°C
(39°F)		4°C
(39°F)		3°C
(37°F)		-0°C
(32°F)		-1°C
(30°F)		-2°C
(29°F)		-1°C
(30°F)		-2°C
(29°F)		1°C
(34°F)		1°C
(34°F)		3°C
(38°F)

Compare climate in Casterton with other places

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

Monthly average precipitation in Casterton, Australia

Casterton usually has the most precipitation in May, July and August, with an average of 12 rainy days and 71 mm (2.8 inches) of precipitation per month. The driest months in Casterton are January, February and March. On average, 24 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Casterton. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)26 (1.0)23 (0.9)23 (0.9)37 (1.5)67 (2.7)44 (1.7)73 (2.9)73 (2.9)66 (2.6)63 (2.5)57 (2.3)35 (1.4)
Average precipitation days (≥ 1 mm)24571191314131186

Monthly sunshine hours in Casterton, Australia

The sunniest months in Casterton are February, November and December, when the sun shines an average of 10 hours 9 minutes a day. Least sunny months in Casterton: May, June and July receive an average of 6 hours 35 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Casterton. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours282284281219202194209230247262293335
Mean daily daylight hours14h 24m13h 28m12h 17m11h 5m10h 5m9h 35m9h 50m10h 42m11h 50m13h 3m14h 7m14h 41m

Solar UV radiation in Casterton, Australia

Casterton experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 12 - 14, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Casterton UV Index data.

Average daily maximum UV levels by month for Casterton. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)14121174335791214