nomadseason

Monthly climate in Grantham, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Grantham features a humid subtropical climate (Cfa). Temperatures typically range between 13 °C (55 °F) and 24 °C (76 °F) through the year, but rarely can drop to 0 °C (31 °F) or can rise to as high as 41 °C (105 °F). The average annual precipitation amounts to about 712 mm (28.0 inches) and receives 88 rainy days on the 1 mm (0.04 inches) threshold annually. Grantham enjoys an average of 3379 hours of sunshine throughout the year, and daylight varies from 10 hours 24 minutes to 13 hours 50 minutes per day.

Monthly average temperatures in Grantham, Australia

The warmest months in Grantham are January, February and December, with daily mean temperatures ranging from 24 to 24 °C (75 - 76 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 13 to 14 °C (55 - 57 °F) throughout the day. On average each year, Grantham experiences 167 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 Grantham. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum38°C
(101°F)		41°C
(105°F)		37°C
(100°F)		31°C
(87°F)		29°C
(85°F)		25°C
(77°F)		26°C
(79°F)		28°C
(83°F)		34°C
(94°F)		34°C
(94°F)		36°C
(96°F)		38°C
(101°F)
Mean maximum35°C
(95°F)		37°C
(98°F)		34°C
(93°F)		29°C
(85°F)		27°C
(80°F)		22°C
(72°F)		24°C
(75°F)		26°C
(79°F)		30°C
(86°F)		32°C
(90°F)		33°C
(91°F)		36°C
(96°F)
Average high30°C
(87°F)		29°C
(85°F)		28°C
(82°F)		25°C
(77°F)		22°C
(72°F)		20°C
(67°F)		20°C
(68°F)		21°C
(70°F)		24°C
(76°F)		26°C
(79°F)		28°C
(82°F)		30°C
(86°F)
Daily mean24°C
(76°F)		24°C
(75°F)		22°C
(73°F)		19°C
(67°F)		16°C
(61°F)		13°C
(56°F)		13°C
(55°F)		14°C
(57°F)		17°C
(63°F)		20°C
(68°F)		22°C
(71°F)		24°C
(75°F)
Average low20°C
(67°F)		19°C
(67°F)		18°C
(65°F)		14°C
(57°F)		11°C
(52°F)		8°C
(46°F)		7°C
(45°F)		7°C
(44°F)		10°C
(50°F)		14°C
(58°F)		16°C
(61°F)		18°C
(65°F)
Mean minimum16°C
(61°F)		16°C
(61°F)		14°C
(57°F)		9°C
(49°F)		6°C
(43°F)		4°C
(39°F)		1°C
(34°F)		2°C
(36°F)		4°C
(40°F)		9°C
(48°F)		11°C
(53°F)		14°C
(58°F)
Minimum15°C
(59°F)		13°C
(56°F)		12°C
(55°F)		6°C
(43°F)		3°C
(38°F)		1°C
(34°F)		-0°C
(31°F)		2°C
(35°F)		4°C
(39°F)		8°C
(47°F)		11°C
(51°F)		14°C
(57°F)

Compare climate in Grantham with other places

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

Monthly average precipitation in Grantham, Australia

Grantham usually has the most precipitation in February, March and October, with an average of 12 rainy days and 116 mm (4.6 inches) of precipitation per month. The driest months in Grantham are May, August and September. On average, 14 mm (0.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grantham. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)69 (2.7)97 (3.8)130 (5.1)38 (1.5)19 (0.8)30 (1.2)27 (1.1)11 (0.4)11 (0.4)122 (4.8)61 (2.4)96 (3.8)
Average precipitation days (≥ 1 mm)9111444552312712

Monthly sunshine hours in Grantham, Australia

The sunniest months in Grantham are September, November and December, when the sun shines an average of 10 hours 19 minutes a day. Least sunny months in Grantham: May, June and July receive an average of 8 hours 16 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grantham. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours272279269275259242260292295289312331
Mean daily daylight hours13h 39m13h 1m12h 13m11h 24m10h 44m10h 24m10h 34m11h 9m11h 55m12h 44m13h 27m13h 50m

Solar UV radiation in Grantham, Australia

Grantham experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 7. For more detailed information, check out our hourly Grantham UV Index data.

Average daily maximum UV levels by month for Grantham. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)16151410755810121415