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Monthly climate in Walla Walla, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Walla Walla features a humid subtropical climate (Cfa). Temperatures typically range between 8 °C (46 °F) and 25 °C (77 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 44 °C (111 °F). The average annual precipitation amounts to about 636 mm (25.0 inches) and receives 81 rainy days on the 1 mm (0.04 inches) threshold annually. Walla Walla enjoys an average of 3314 hours of sunshine throughout the year, and daylight varies from 9 hours 45 minutes to 14 hours 30 minutes per day.

Monthly average temperatures in Walla Walla, Australia

The warmest months in Walla Walla are January, February and December, with daily mean temperatures ranging from 22 to 25 °C (72 - 77 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 8 to 8 °C (46 - 47 °F) throughout the day. On average each year, Walla Walla experiences 118 days above 25 °C (77.0 °F) and 11 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Walla Walla. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum43°C
(111°F)		44°C
(111°F)		36°C
(98°F)		34°C
(94°F)		27°C
(81°F)		18°C
(65°F)		19°C
(66°F)		20°C
(69°F)		28°C
(82°F)		32°C
(90°F)		39°C
(103°F)		42°C
(107°F)
Mean maximum40°C
(104°F)		38°C
(100°F)		33°C
(92°F)		28°C
(83°F)		23°C
(74°F)		16°C
(61°F)		17°C
(63°F)		19°C
(66°F)		24°C
(76°F)		28°C
(82°F)		34°C
(94°F)		38°C
(100°F)
Average high32°C
(90°F)		29°C
(85°F)		27°C
(81°F)		22°C
(72°F)		17°C
(62°F)		13°C
(56°F)		12°C
(55°F)		13°C
(56°F)		17°C
(63°F)		21°C
(71°F)		25°C
(77°F)		29°C
(84°F)
Daily mean25°C
(77°F)		23°C
(73°F)		21°C
(69°F)		16°C
(61°F)		11°C
(52°F)		8°C
(46°F)		8°C
(46°F)		8°C
(47°F)		11°C
(52°F)		15°C
(59°F)		18°C
(65°F)		22°C
(72°F)
Average low18°C
(65°F)		16°C
(61°F)		14°C
(58°F)		10°C
(50°F)		6°C
(43°F)		3°C
(38°F)		4°C
(39°F)		4°C
(39°F)		5°C
(41°F)		9°C
(48°F)		12°C
(54°F)		15°C
(59°F)
Mean minimum11°C
(52°F)		9°C
(49°F)		8°C
(47°F)		5°C
(41°F)		1°C
(35°F)		-1°C
(30°F)		-2°C
(29°F)		-2°C
(28°F)		-1°C
(31°F)		2°C
(37°F)		4°C
(40°F)		8°C
(47°F)
Minimum10°C
(49°F)		7°C
(44°F)		6°C
(43°F)		1°C
(34°F)		-1°C
(30°F)		-3°C
(27°F)		-4°C
(25°F)		-3°C
(26°F)		-2°C
(29°F)		1°C
(34°F)		3°C
(38°F)		6°C
(44°F)

Compare climate in Walla Walla with other places

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

Monthly average precipitation in Walla Walla, Australia

Walla Walla usually has the most precipitation in July, October and November, with an average of 9 rainy days and 69 mm (2.7 inches) of precipitation per month. The driest months in Walla Walla are January, February and April. On average, 36 mm (1.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Walla Walla. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)36 (1.4)28 (1.1)55 (2.2)44 (1.7)53 (2.1)55 (2.2)62 (2.5)62 (2.4)45 (1.8)63 (2.5)82 (3.2)49 (1.9)
Average precipitation days (≥ 1 mm)43637711108886

Monthly sunshine hours in Walla Walla, Australia

The sunniest months in Walla Walla are October, November and December, when the sun shines an average of 10 hours 49 minutes a day. Least sunny months in Walla Walla: June, July and August receive an average of 7 hours 3 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Walla Walla. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours292309306260232205212231267314317363
Mean daily daylight hours14h 15m13h 22m12h 16m11h 9m10h 13m9h 45m9h 59m10h 47m11h 51m12h 59m13h 59m14h 30m

Solar UV radiation in Walla Walla, Australia

Walla Walla experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 13 - 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 5. For more detailed information, check out our hourly Walla Walla UV Index data.

Average daily maximum UV levels by month for Walla Walla. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141312853357101214