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Monthly climate in St Helena, Australia

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification St Helena features a oceanic climate (Cfb). Temperatures typically range between 10 °C (49 °F) and 21 °C (70 °F) through the year, but rarely can drop to -1 °C (31 °F) or can rise to as high as 43 °C (110 °F). The average annual precipitation amounts to about 660 mm (26.0 inches) and receives 107 rainy days on the 1 mm (0.04 inches) threshold annually. St Helena enjoys an average of 3107 hours of sunshine throughout the year, and daylight varies from 9 hours 34 minutes to 14 hours 43 minutes per day.

Monthly average temperatures in St Helena, Australia

The warmest months in St Helena are January, February and March, with daily mean temperatures ranging from 19 to 21 °C (66 - 70 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 10 to 10 °C (49 - 50 °F) throughout the day. On average each year, St Helena experiences 70 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 Helena. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum43°C
(110°F)		42°C
(109°F)		38°C
(101°F)		32°C
(89°F)		25°C
(77°F)		18°C
(65°F)		18°C
(64°F)		21°C
(70°F)		27°C
(81°F)		32°C
(91°F)		39°C
(102°F)		43°C
(109°F)
Mean maximum39°C
(103°F)		36°C
(97°F)		33°C
(91°F)		28°C
(83°F)		22°C
(72°F)		16°C
(61°F)		17°C
(63°F)		19°C
(66°F)		25°C
(77°F)		28°C
(83°F)		34°C
(93°F)		37°C
(98°F)
Average high27°C
(81°F)		25°C
(78°F)		24°C
(76°F)		20°C
(69°F)		16°C
(62°F)		14°C
(57°F)		13°C
(56°F)		14°C
(57°F)		17°C
(62°F)		19°C
(67°F)		22°C
(72°F)		24°C
(76°F)
Daily mean21°C
(70°F)		19°C
(67°F)		19°C
(66°F)		15°C
(60°F)		12°C
(54°F)		10°C
(50°F)		10°C
(49°F)		10°C
(50°F)		12°C
(54°F)		14°C
(58°F)		17°C
(62°F)		18°C
(65°F)
Average low15°C
(60°F)		14°C
(58°F)		14°C
(57°F)		11°C
(52°F)		9°C
(48°F)		7°C
(44°F)		6°C
(44°F)		7°C
(44°F)		7°C
(46°F)		9°C
(49°F)		11°C
(52°F)		13°C
(55°F)
Mean minimum10°C
(51°F)		9°C
(49°F)		9°C
(48°F)		6°C
(44°F)		3°C
(38°F)		3°C
(37°F)		1°C
(34°F)		2°C
(36°F)		2°C
(36°F)		4°C
(39°F)		5°C
(42°F)		9°C
(48°F)
Minimum9°C
(49°F)		8°C
(46°F)		8°C
(47°F)		5°C
(41°F)		3°C
(38°F)		1°C
(34°F)		-1°C
(31°F)		1°C
(34°F)		1°C
(33°F)		3°C
(38°F)		5°C
(42°F)		8°C
(46°F)

Compare climate in St Helena with other places

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

Monthly average precipitation in St Helena, Australia

St Helena usually has the most precipitation in September, October and December, with an average of 10 rainy days and 70 mm (2.8 inches) of precipitation per month. The driest months in St Helena are January, February and March. On average, 42 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in St Helena. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)42 (1.6)44 (1.7)40 (1.6)51 (2.0)57 (2.2)54 (2.1)46 (1.8)58 (2.3)64 (2.5)74 (2.9)58 (2.3)74 (2.9)
Average precipitation days (≥ 1 mm)546710912131212107

Monthly sunshine hours in St Helena, Australia

The sunniest months in St Helena are February, November and December, when the sun shines an average of 10 hours 11 minutes a day. Least sunny months in St Helena: May, June and July receive an average of 6 hours 41 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in St Helena. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours279289285239213191209230258281291336
Mean daily daylight hours14h 26m13h 29m12h 17m11h 4m10h 4m9h 34m9h 49m10h 41m11h 50m13h 3m14h 9m14h 43m

Solar UV radiation in St Helena, Australia

St Helena 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 St Helena UV Index data.

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