Last updated: June 24, 2025
In New Martinsville, United States, the average temperature in September hovers around 20°C (69°F), with fluctuations that can drop to a brisk 5°C (42°F) or soar to a balmy 34°C (94°F). Expect 107 mm (4.2 in) of precipitation spread over 10 days, accompanied by a comfortable average humidity of 73%. Whether you're enjoying warm afternoons or refreshing evenings, New Martinsville offers a delightful mix of climates.
In September in New Martinsville, the average temperature is 20°C (69°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop to as low as 5°C (42°F). Be sure to pack for a range of weather conditions, from warm days to cooler evenings, as you explore New Martinsville.
In New Martinsville in September, the precipitation amount is 107 mm (4.2 in) accumulated over a period of 10 days.
In New Martinsville in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.
In New Martinsville in September, 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 New Martinsville.
UV Risk Categories
Weather in New Martinsville varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in New Martinsville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 93 mm (3.7 inches) | 88% | moderate |
| February Weather | 3°C (37°F) | 125 mm (4.9 inches) | 88% | moderate |
| March Weather | 6°C (44°F) | 120 mm (4.7 inches) | 88% | high |
| April Weather | 12°C (53°F) | 145 mm (5.7 inches) | 86% | very high |
| May Weather | 17°C (64°F) | 140 mm (5.5 inches) | 82% | very high |
| June Weather | 21°C (71°F) | 175 mm (6.9 inches) | 84% | very high |
| July Weather | 24°C (75°F) | 135 mm (5.3 inches) | 82% | very high |
| August Weather | 23°C (73°F) | 99 mm (3.9 inches) | 73% | very high |
| September Weather | 20°C (69°F) | 107 mm (4.2 inches) | 73% | very high |
| October Weather | 14°C (58°F) | 115 mm (4.5 inches) | 81% | high |
| November Weather | 6°C (43°F) | 88 mm (3.5 inches) | 89% | moderate |
| December Weather | 3°C (38°F) | 121 mm (4.8 inches) | 86% | moderate |