May weather forecast
Longwood, Saint Helena, Ascension and Tristan da Cunha

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Weather in May

Shifting into May, Longwood experiences a unique blend of weather conditions, reflecting the change in seasons. Records indicate a decrease in temperatures, with the upper limit being 23.2°C (73.8°F), signifying the start of a cooling trend stretching till September. Despite the fading of summer, clear skies still persist, with a stable visibility of 10km (6.2mi) maintained. May ensures mild weather conditions, encouraging local and travelling adventurers to embark on their exploration journeys. The gentle weather, aided by the slight decline in rainfall, makes this month one of the most favourable for outdoor activities.

Temperature

Transitioning from April to May, Longwood observes an average high-temperature of a still moderately hot 23.2°C (73.8°F), differing subtly from the previous month. Maintaining close parity with daytime warmth, the average nocturnal temperature during May stays at an agreeable 22.1°C (71.8°F).

Humidity

The average relative humidity in May is 76%.

Rainfall

May, September through November are months with the least rain when the rain falls for 10.5 days and typically aggregates up to 6mm (0.24") of rain.

Daylight

The average length of the day in May is 11h and 22min.
On the first day of May in Longwood, sunrise is at 06:34 and sunset at 18:05. On the last day of the month, sunrise is at 06:43 and sunset at 17:57 GMT.

Sunshine

In Longwood, the average sunshine in May is 5.7h.

UV index

The months with the highest UV index in Longwood are January through March and May, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: During May, 6 as the daily maximum UV index converts into the following advice:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

Frequently asked questions

What is the usual temperature for Longwood in May?

The high-temperature, in May, in Longwood, records 23.2°C (73.8°F), while the low-temperature is 22.1°C (71.8°F).

What is the average humidity in May in Longwood?

In May, the average relative humidity in Longwood is 76%.

What is the driest month in Longwood?

May, September through November are months with the least rain when the rain falls for 10.5 days and typically aggregates up to 6mm (0.24") of rain.

How much does it rain in Longwood in May?

In May, the rain falls for 10.5 days. Throughout May, 6mm (0.24") of precipitation is accumulated.

How many hours of daylight does Longwood have in May?

In Longwood, the average day length in May is 11h and 22min.

What time are sunrise and sunset in May in Longwood?

In May, on the first day of the month, sunrise is at 06:34 and sunset at 18:05. On the last day of the month, sunrise is at 06:43 and sunset at 17:57 GMT.

How long on average sun shines in May in Longwood?

In May, the average sunshine duration in Longwood is 5.7h.

When is the highest UV index in Longwood?

January through March and May, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index reading in May in Longwood?

The average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.

Average temperature in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average temperature in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average high temperature in May: 23.2°C

The warmest month (with the highest average high temperature) is March (24.7°C).
The month with the lowest average high temperature is September (19.7°C).

  • Average low temperature in May: 22.1°C

The month with the highest average low temperature is March (23.5°C).
The coldest months (with the lowest average low temperature) are September and October (18.7°C).

Average pressure in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average pressure in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average pressure in May: 1016.6mbar

The months with the highest atmospheric pressure are July and August (1019.8mbar).
The month with the lowest atmospheric pressure is February (1014.1mbar).

Average wind speed in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average wind speed in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average wind speed in May: 23.8km/h

The windiest month (with the highest average wind speed) is September (28.4km/h).
The calmest month (with the lowest average wind speed) is January (21.8km/h).

Average humidity in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average humidity in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average humidity in May: 76%

The month with the highest relative humidity is October (82%).
The months with the lowest relative humidity are June and July (74%).

Average rainfall in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average rainfall in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall in May: 6mm

The wettest month (with the highest rainfall) is June (11mm).
The driest months (with the least rainfall) are May, September, October and November (6mm).

Average rainfall days in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average rainfall days in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average rainfall days in May: 10.5 days

The month with the highest number of rainy days is June (13.6 days).
The month with the least rainy days is November (8.5 days).

Average daylight in May /
Average sunshine in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average daylight in May / Average sunshine in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average daylight in May: 11h and 2min

The month with the longest days is December (Average daylight: 13h and 6min).
The month with the shortest days is June (Average daylight: 11h and 12min).

  • Average sunshine in May: 5h and 4min

The month with the most sunshine is February (Average sunshine: 7h and 30min).
The month with the least sunshine is September (Average sunshine: 4h and 0min).

Average sunshine days in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average sunshine days in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average sunshine days in May: 13.2 days

The month with the most sunshine days is May (13.2 days).
The month with the least sunshine days is February (7.2 days).

Average UV index in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average UV index in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average UV index in May: 6

The months with the highest UV index are January, February, March and May (UV index 6).
The months with the lowest UV index are August, September and October (UV index 4).

Average cloud cover in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average cloud cover in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average cloud cover in May: 51

The month with the most cloud cover is September (Cloud cover 74).
The month with the least cloud cover is February (Cloud cover 44).

Average visibility in May
Longwood, Saint Helena, Ascension and Tristan da Cunha

Average visibility in May - Longwood, Saint Helena, Ascension and Tristan da Cunha
  • Average visibility in May: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

Longwood, Saint Helena, Ascension and Tristan da Cunha

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