Jamestown Weather in September
September is one of the perfect months to visit Jamestown , with daytime temperatures of 21°C (70°F) and lows of 19°C (66°F) at night. Rainfall is minimal, averaging just 12 mm (0.5 in) for the month.
Rainfall in Jamestown in September
You can expect rain on roughly 10 days based on historical data, averaging 12 mm (0.5 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Jamestown in September
Jamestown has perfect weather in September, with days reaching 21°C (70°F) and nights cooling to 19°C (66°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. At 19°C (66°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping. While temperatures are the coolest of this year this month, they remain pleasant and warm for outdoor activities.Our weather planner can help you explore other travel destinations worldwide.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Helena, check out our Jamestown 's climate page.
Jamestown Temperature in September
Min Temperature
19°C (66°F)
Max Temperature
21°C (70°F)
Chance of Rain
33%
Precipitation
12 mm (0.5 in)
Rainy days
10 days
Humidity
75%
Daily Historical Temperatures
47-year average (1978-2025)
Based on our historical records, temperatures in Jamestown typically stay consistent throughout September, with daily highs averaging around 21°C (70°F). Nights are pleasant, with lows around 15°C (59°F).
Average temperatures in September
Daily Historical Precipitation
47-year average (1978-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Jamestown in September
Browse day-by-day weather records for Jamestown spanning 50 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Jamestown historical weather extremes in September
According to our 21 years of weather records for Jamestown , the following extremes were recorded between 2004 and 2025.
- The hottest September day on record in Jamestown reached 29°C (84°F) (September 10, 2022).
- The coldest September day was on September 4, 2012, with a maximum of 15°C (59°F).
- Jamestown registered its coldest September night on September 21, 2013, with temperatures dropping to 13°C (55°F).
Best Places in Saint Helena in September
Find out more about the weather in Saint Helena and which places have the best travel conditions in this month. See all of Saint Helena in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Jamestown in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. With minimal rainfall expected, you can leave the rain gear at home.What To Do in Jamestown in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Saint Helena, check out our Jamestown 's climate page.
See the full Jamestown climate overview or explore weather in Saint Helena.
