Last updated: June 24, 2025
In September, the average temperature in Jamestown, United States hovers around 15°C (60°F), with potential fluctuations ranging from a chilly -1°C (30°F) to a warm 32°C (91°F). During this month, you can expect around 71 mm (2.8 in) of precipitation over 8 days, contributing to an average humidity of 72%. Whether you're soaking in the sunshine or dodging the rain, be prepared for the diverse weather!
In September in Jamestown, the average temperature is 15°C (60°F). The maximum can reach 32°C (91°F), while the minimum can dip as low as -1°C (30°F). This climate variability makes it essential for travelers to pack versatile clothing options to accommodate for both warm days and cooler nights.
In Jamestown in September, the precipitation amount is 71 mm (2.8 in) over the course of 8 days.
In Jamestown in September humidity is 72%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace, creating a slightly muggy atmosphere that can make strolling around a bit sticky. Travelers might find themselves longing for a refreshing breeze, and it’s advisable to stay hydrated while exploring local sights.
In Jamestown in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Jamestown.
UV Risk Categories
Weather in Jamestown varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Jamestown, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -11°C (12°F) | 17 mm (0.7 inches) | 87% | low |
| February Weather | -13°C (10°F) | 19 mm (0.8 inches) | 89% | moderate |
| March Weather | -3°C (27°F) | 25 mm (1.0 inches) | 82% | moderate |
| April Weather | 4°C (39°F) | 38 mm (1.5 inches) | 79% | very high |
| May Weather | 13°C (55°F) | 56 mm (2.2 inches) | 74% | very high |
| June Weather | 20°C (68°F) | 83 mm (3.2 inches) | 78% | very high |
| July Weather | 22°C (72°F) | 87 mm (3.4 inches) | 76% | very high |
| August Weather | 20°C (68°F) | 104 mm (4.1 inches) | 77% | very high |
| September Weather | 15°C (60°F) | 71 mm (2.8 inches) | 72% | high |
| October Weather | 6°C (43°F) | 74 mm (2.9 inches) | 74% | moderate |
| November Weather | -2°C (29°F) | 19 mm (0.7 inches) | 85% | moderate |
| December Weather | -7°C (19°F) | 35 mm (1.4 inches) | 84% | low |