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Monthly climate in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Longwood features a hot desert climate (BWh).Temperatures typically range between 19 °C (67 °F) and 24 °C (76 °F) through the year, but rarely can drop to 18 °C (64 °F) or can rise to as high as 26 °C (79 °F).The average annual precipitation amounts to about 148 mm (5.8 inches) and receives 20 rainy days on the 1 mm (0.04 inches) threshold annually.Longwood enjoys an average of 3447 hours of sunshine throughout the year, and daylight varies from 11 hours 10 minutes to 13 hours 2 minutes per day.

Monthly average temperatures in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha §

The warmest months in Longwood are February, March and April, with daily mean temperatures ranging from 24 to 24 °C (75 - 76 °F) throughout the day. The coldest temperatures usually occur in August, September and October, when daily mean temperatures range from 19 to 20 °C (67 - 68 °F) throughout the day. On average each year, Longwood experiences 9 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 Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 25°C
(77°F)		 26°C
(79°F)		 25°C
(78°F)		 25°C
(78°F)		 24°C
(76°F)		 23°C
(74°F)		 22°C
(72°F)		 21°C
(71°F)		 21°C
(69°F)		 21°C
(69°F)		 22°C
(71°F)		 23°C
(73°F)
Mean maximum 24°C
(75°F)		 25°C
(77°F)		 25°C
(77°F)		 25°C
(77°F)		 24°C
(75°F)		 23°C
(73°F)		 22°C
(71°F)		 21°C
(70°F)		 20°C
(69°F)		 20°C
(69°F)		 21°C
(70°F)		 22°C
(72°F)
Average high 23°C
(74°F)		 24°C
(75°F)		 25°C
(76°F)		 24°C
(76°F)		 23°C
(74°F)		 22°C
(72°F)		 21°C
(70°F)		 20°C
(69°F)		 20°C
(68°F)		 20°C
(68°F)		 20°C
(69°F)		 21°C
(71°F)
Daily mean 23°C
(73°F)		 24°C
(75°F)		 24°C
(76°F)		 24°C
(75°F)		 23°C
(73°F)		 22°C
(71°F)		 21°C
(69°F)		 20°C
(68°F)		 20°C
(67°F)		 19°C
(67°F)		 20°C
(68°F)		 21°C
(70°F)
Average low 22°C
(72°F)		 23°C
(74°F)		 24°C
(75°F)		 23°C
(75°F)		 22°C
(73°F)		 21°C
(71°F)		 20°C
(69°F)		 20°C
(68°F)		 19°C
(67°F)		 19°C
(67°F)		 20°C
(68°F)		 21°C
(69°F)
Mean minimum 21°C
(71°F)		 22°C
(73°F)		 23°C
(73°F)		 23°C
(73°F)		 22°C
(71°F)		 21°C
(69°F)		 19°C
(67°F)		 19°C
(66°F)		 19°C
(66°F)		 18°C
(65°F)		 19°C
(67°F)		 20°C
(68°F)
Minimum 21°C
(70°F)		 22°C
(71°F)		 22°C
(72°F)		 22°C
(72°F)		 21°C
(70°F)		 20°C
(68°F)		 19°C
(66°F)		 18°C
(66°F)		 18°C
(65°F)		 18°C
(64°F)		 19°C
(66°F)		 19°C
(67°F)

Compare climate in Longwood with other places

Compare temperature, precipitation, sunshine, UV index in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha with other places around the world.

Monthly average precipitation in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha §

Longwood usually has the most precipitation in March, April and August, with an average of 3 rainy days and 15 mm (0.6 inches) of precipitation per month.The driest months in Longwood are January, November and December. On average, 10 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 10 (0.4) 12 (0.5) 16 (0.6) 14 (0.6) 12 (0.5) 14 (0.5) 12 (0.5) 14 (0.6) 13 (0.5) 11 (0.4) 10 (0.4) 10 (0.4)
Average precipitation days (≥ 1 mm) 0 1 3 4 3 3 2 3 1 0 0 0

Monthly sunshine hours in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha §

The sunniest months in Longwood are February, March and December, when the sun shines an average of 10 hours 40 minutes a day.Least sunny months in Longwood: June, August and September receive an average of 8 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 276 313 323 304 289 243 271 248 254 280 306 334
Mean daily daylight hours 12h 56m 12h 35m 12h 9m 11h 42m 11h 21m 11h 10m 11h 16m 11h 35m 12h 0m 12h 27m 12h 50m 13h 2m

Solar UV radiation in Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha §

Longwood experiences the highest level of ultraviolet (UV) radiation in January, February and December, when the maximum UV index can reach values of 15 - 15, which corresponds to the Extreme category of sun exposure.May, June and July are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 9. For more detailed information, check out our hourly Longwood UV Index data.

Average daily maximum UV levels by month for Longwood, Saint Helena, Saint Helena, Ascension and Tristan da Cunha.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 15 15 13 12 9 8 8 10 11 14 14 15