June Weather in Jamestown, Saint Helena, Ascension and Tristan da Cunha

Last updated: August 31, 2025

In June, the average temperature in Jamestown, Saint Helena, Ascension and Tristan da Cunha hovers around 22°C (71°F). You'll experience mild conditions, with a minimum of 20°C (68°F) and a maximum of 23°C (74°F). Expect 14 mm (0.5 in) of precipitation spread over 3 days, and enjoy a comfortable average humidity of 74%.

June Temperature in Jamestown

In June in Jamestown, the average temperature is 22°C (71°F). The maximum can reach 23°C (74°F), and the minimum can be as low as 20°C (68°F). This mild climate makes Jamestown an ideal destination for travelers seeking pleasant weather.

June Weather in Jamestown: Daily Temperature Highs, Lows, and Averages

The chart illustrates June temperature patterns in Jamestown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jamestown, June typically has an average temperature of 22°C (71°F), with highs reaching up to 23°C (74°F) and lows dropping to around 20°C (68°F).

Data source: Temperature data for Jamestown generated using information from the Copernicus Climate Change Service.

June Precipitation in Jamestown

In Jamestown in June, the precipitation amount is 14 mm (0.5 in) over the course of 3 days.

June Precipitation Trends in Jamestown

The chart displays monthly precipitation patterns in Jamestown, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Jamestown, June typically receives around 14 mm (0.5 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

June Humidity in Jamestown

In Jamestown in June, humidity is 74%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making travel slightly sticky but still enjoyable, as long as you stay hydrated and take breaks in the shade.

June Average Humidity in Jamestown

This chart illustrates the average monthly humidity levels in Jamestown, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Jamestown is approximately 74%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Jamestown

In Jamestown in June, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Jamestown.

Maximum UV Index Levels in Jamestown for June

The chart shows the monthly maximum UV Index (UVI) for Jamestown in June, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In June, the maximum UV index in Jamestown typically reaches 8, which falls under the very high exposure category.

Data source: Jamestown June UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How June Weather in Jamestown Compares to Other Months

Weather in Jamestown varies notably across the year, with each month offering distinct climate conditions. This page compares June’s weather to other months in Jamestown, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Jamestown, showing how June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	23°C (73°F)	10 mm (0.4 inches)	79%	extreme
February Weather	24°C (75°F)	12 mm (0.5 inches)	81%	extreme
March Weather	24°C (76°F)	16 mm (0.6 inches)	82%	extreme
April Weather	24°C (75°F)	14 mm (0.6 inches)	81%	extreme
May Weather	23°C (73°F)	12 mm (0.5 inches)	78%	very high
June Weather	22°C (71°F)	14 mm (0.5 inches)	74%	very high
July Weather	21°C (69°F)	12 mm (0.5 inches)	75%	very high
August Weather	20°C (68°F)	14 mm (0.6 inches)	76%	very high
September Weather	20°C (67°F)	13 mm (0.5 inches)	78%	extreme
October Weather	19°C (67°F)	11 mm (0.4 inches)	80%	extreme
November Weather	20°C (68°F)	10 mm (0.4 inches)	81%	extreme
December Weather	21°C (70°F)	10 mm (0.4 inches)	80%	extreme