Climate Chart of Georgetown, Saint Helena, Ascension and Tristan da Cunha

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

Climate overview

Temperature

The monthly mean temperature reaches its highest point at 26.6 °C in April, and its lowest at 23.2 °C in September. These are averages for whole months, not daytime maximum temperatures, so they describe the broad temperature pattern rather than the warmth of a particular afternoon. The unweighted mean across monthly means is 24.8 °C; it is not a day-weighted annual average.

Rain

Mean daily rainfall is highest at 0.70 mm/day in March and lowest at 0.10 mm/day in December. The unweighted mean across monthly means is 0.28 mm/day. These are daily averages, not monthly totals; they indicate how the average amount varies by month but do not show how often rain falls or guarantee dry weather in the lower-rainfall month.

Sunshine

Mean daily sunshine duration is greatest at 11.62 hours/day in January and least at 10.32 hours/day in September. The unweighted mean across monthly means is 10.91 hours/day. These averages can help with broad outdoor-planning expectations, but sunshine duration is not the same as day length and does not describe conditions on every day.

Best Travel Time Guide for Georgetown, Saint Helena, Ascension and Tristan da Cunha: Ideal Seasons and Weather Insights

For visitors prioritising lower average rainfall, December is the conditional option in this record, with mean daily rainfall of 0.10 mm/day; it is not a guarantee of rain-free days. Prepare for rain if travelling in March, when the mean daily amount reaches 0.70 mm/day, while keeping in mind that these figures do not indicate rainfall frequency. Those prioritising cooler monthly mean temperatures may favour September, when the mean is 23.2 °C. For outdoor sightseeing planned around average sunshine duration, January has the highest mean at 11.62 hours/day, while September has the lowest at 10.32 hours/day. These are separate criteria rather than a single best-time ranking, and neither monthly averages nor sunshine duration predict a specific day's conditions or daylight length.

Climate Data Overview for Georgetown, Saint Helena, Ascension and Tristan da Cunha

Explore the comprehensive climate data for Georgetown, Saint Helena, Ascension and Tristan da Cunha. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

• See also climate change in Georgetown
• Explore the climate in Saint Helena, Ascension and Tristan da Cunha