Last updated: June 24, 2025
In September, the average temperature in West Yarmouth, United States hovers around 19°C (67°F). Visitors can expect a minimum of 13°C (56°F) and a comfortable maximum of 25°C (78°F). With an average precipitation of 118 mm (4.7 in) over 10 days, and a humidity level of 75%, it's a great time to experience the local climate—just remember to bring an umbrella for those occasional showers!
In September in West Yarmouth, the average temperature is 19°C (67°F). Maximums can reach 25°C (78°F), and minimums can be as low as 13°C (56°F). This mild climate makes West Yarmouth an ideal destination for travelers seeking pleasant weather.
In West Yarmouth in September, the precipitation amount is 118 mm (4.7 in) over a span of 10 days.
In West Yarmouth in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.
In West Yarmouth 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 West Yarmouth.
UV Risk Categories
Weather in West Yarmouth varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in West Yarmouth, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 2°C (36°F) | 94 mm (3.7 inches) | 84% | moderate |
| February Weather | 2°C (36°F) | 123 mm (4.8 inches) | 84% | moderate |
| March Weather | 3°C (38°F) | 118 mm (4.7 inches) | 82% | high |
| April Weather | 7°C (46°F) | 137 mm (5.4 inches) | 79% | very high |
| May Weather | 12°C (53°F) | 119 mm (4.7 inches) | 75% | very high |
| June Weather | 17°C (63°F) | 91 mm (3.6 inches) | 78% | very high |
| July Weather | 21°C (71°F) | 83 mm (3.3 inches) | 76% | very high |
| August Weather | 22°C (72°F) | 82 mm (3.2 inches) | 76% | very high |
| September Weather | 19°C (67°F) | 118 mm (4.7 inches) | 75% | very high |
| October Weather | 15°C (59°F) | 175 mm (6.9 inches) | 75% | high |
| November Weather | 9°C (48°F) | 102 mm (4.0 inches) | 80% | moderate |
| December Weather | 4°C (40°F) | 136 mm (5.4 inches) | 80% | low |