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Monthly climate in St Helens, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification St Helens features a oceanic climate (Cfb). Temperatures typically range between 10 °C (50 °F) and 17 °C (63 °F) through the year, but rarely can drop to 5 °C (41 °F) or can rise to as high as 27 °C (81 °F). The average annual precipitation amounts to about 745 mm (29.3 inches) and receives 109 rainy days on the 1 mm (0.04 inches) threshold annually. St Helens enjoys an average of 3293 hours of sunshine throughout the year, and daylight varies from 9 hours 13 minutes to 15 hours 5 minutes per day.

Monthly average temperatures in St Helens, Australia

The warmest months in St Helens are January, February and March, with daily mean temperatures ranging from 16 to 17 °C (62 - 63 °F) throughout the day. The coldest temperatures usually occur in July, August and September, when daily mean temperatures range from 10 to 11 °C (50 - 52 °F) throughout the day. On average each year, St Helens experiences 1 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 St Helens. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum27°C
(81°F)		25°C
(78°F)		23°C
(74°F)		22°C
(71°F)		19°C
(66°F)		15°C
(60°F)		14°C
(58°F)		15°C
(60°F)		17°C
(62°F)		19°C
(66°F)		22°C
(71°F)		24°C
(76°F)
Mean maximum25°C
(78°F)		23°C
(73°F)		22°C
(71°F)		20°C
(67°F)		18°C
(64°F)		14°C
(58°F)		14°C
(57°F)		14°C
(58°F)		16°C
(61°F)		18°C
(64°F)		20°C
(68°F)		23°C
(73°F)
Average high19°C
(67°F)		18°C
(65°F)		18°C
(65°F)		16°C
(62°F)		15°C
(58°F)		13°C
(55°F)		12°C
(54°F)		12°C
(54°F)		13°C
(55°F)		14°C
(57°F)		15°C
(60°F)		17°C
(63°F)
Daily mean17°C
(63°F)		17°C
(62°F)		16°C
(62°F)		15°C
(58°F)		13°C
(55°F)		11°C
(52°F)		10°C
(51°F)		10°C
(50°F)		11°C
(52°F)		12°C
(54°F)		14°C
(57°F)		15°C
(60°F)
Average low15°C
(60°F)		15°C
(59°F)		15°C
(59°F)		13°C
(55°F)		11°C
(52°F)		10°C
(50°F)		9°C
(48°F)		8°C
(47°F)		9°C
(48°F)		10°C
(51°F)		12°C
(53°F)		13°C
(56°F)
Mean minimum12°C
(54°F)		11°C
(53°F)		11°C
(53°F)		9°C
(49°F)		8°C
(47°F)		7°C
(45°F)		6°C
(44°F)		6°C
(43°F)		6°C
(43°F)		7°C
(45°F)		7°C
(45°F)		10°C
(49°F)
Minimum11°C
(52°F)		10°C
(50°F)		10°C
(50°F)		8°C
(47°F)		7°C
(45°F)		7°C
(44°F)		6°C
(43°F)		5°C
(41°F)		5°C
(41°F)		7°C
(45°F)		7°C
(44°F)		8°C
(47°F)

Compare climate in St Helens with other places

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

Monthly average precipitation in St Helens, Australia

St Helens usually has the most precipitation in March, October and December, with an average of 11 rainy days and 88 mm (3.5 inches) of precipitation per month. The driest months in St Helens are April, May and July. On average, 41 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in St Helens. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)58 (2.3)76 (3.0)81 (3.2)38 (1.5)45 (1.8)59 (2.3)40 (1.6)49 (1.9)57 (2.3)89 (3.5)58 (2.3)94 (3.7)
Average precipitation days (≥ 1 mm)71110578999131011

Monthly sunshine hours in St Helens, Australia

The sunniest months in St Helens are October, November and December, when the sun shines an average of 10 hours 47 minutes a day. Least sunny months in St Helens: May, June and July receive an average of 7 hours 1 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in St Helens. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours293292292252225198222246276304329358
Mean daily daylight hours14h 45m13h 40m12h 19m10h 56m9h 47m9h 13m9h 30m10h 30m11h 48m13h 11m14h 25m15h 5m

Solar UV radiation in St Helens, Australia

St Helens experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 11 - 13, which corresponds to the Extreme category of sun exposure. May, June and July are in the Low / 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 St Helens UV Index data.

Average daily maximum UV levels by month for St Helens. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)1311964224681113