Weather & climate · Jamestown
Best Time to Visit Saint Helena, Ascension, and Tristan da Cunha
January to May
The best time to visit Saint Helena, Ascension, and Tristan da Cunha is January to May, when daytime highs in Jamestown are around 23–25°C. June to August and November to December are also a good time to go. March is the warmest month (25°C by day), September the coldest (19°C at night).
25°C
Warmest: March
19°C
Coldest nights: September
57 mm
Rain per year
8 mm
Wettest: June
Saint Helena, Ascension, and Tristan da Cunha weather by month
- Jan23°C23°C2 mm
- Feb24°C24°C4 mm
- Mar25°C24°C6 mm
- Apr24°C24°C5 mm
- May23°C23°C7 mm
- Jun22°C22°C8 mm
- Jul21°C20°C5 mm
- Aug20°C20°C5 mm
- Sep20°C19°C4 mm
- Oct20°C20°C4 mm
- Nov21°C20°C4 mm
- Dec22°C21°C3 mm
Best time Good Less ideal
| Month | High | Low | Rain | Humidity | Cloud cover | Verdict |
|---|---|---|---|---|---|---|
| January | 23°C | 23°C | 2 mm | 78% | 61% | Best time |
| February | 24°C | 24°C | 4 mm | 77% | 53% | Best time |
| March | 25°C | 24°C | 6 mm | 77% | 55% | Best time |
| April | 24°C | 24°C | 5 mm | 76% | 59% | Best time |
| May | 23°C | 23°C | 7 mm | 75% | 57% | Best time |
| June | 22°C | 22°C | 8 mm | 73% | 67% | Good |
| July | 21°C | 20°C | 5 mm | 74% | 69% | Good |
| August | 20°C | 20°C | 5 mm | 76% | 82% | Good |
| September | 20°C | 19°C | 4 mm | 78% | 85% | Fair |
| October | 20°C | 20°C | 4 mm | 80% | 87% | Fair |
| November | 21°C | 20°C | 4 mm | 79% | 80% | Good |
| December | 22°C | 21°C | 3 mm | 78% | 71% | Good |
Data: NASA POWER (Prediction Of Worldwide Energy Resources) — 25-year climate averages 2001–2025, public domain, for the area around Jamestown (-15.93, -5.72). Satellite and model averages — local weather stations can differ by 1–2 °C, and mountains or coasts elsewhere in Saint Helena, Ascension, and Tristan da Cunha have their own climate.
Frequently asked questions
When is the best time to visit Saint Helena, Ascension, and Tristan da Cunha?
January to May. The best time to visit Saint Helena, Ascension, and Tristan da Cunha is January to May, when daytime highs in Jamestown are around 23–25°C. June to August and November to December are also a good time to go. March is the warmest month (25°C by day), September the coldest (19°C at night).
What is the hottest month in Saint Helena, Ascension, and Tristan da Cunha?
March, with average highs of 25°C in Jamestown.
What is the coldest month in Saint Helena, Ascension, and Tristan da Cunha?
September, when nights drop to about 19°C and days reach 20°C.
What is the rainiest month in Saint Helena, Ascension, and Tristan da Cunha?
June with about 8 mm; January is the driest (2 mm).
When should I avoid visiting Saint Helena, Ascension, and Tristan da Cunha?
October is the least comfortable month on average: 20°C by day and 4 mm of rain.