Last updated: June 24, 2025
In Monterey, United States, the average temperature in September hovers around 17°C (64°F). Expect a minimum of 1°C (34°F) and a maximum of 29°C (85°F), providing a wide range of weather experiences. During this month, you can anticipate 117 mm (4.6 in) of precipitation spread over about 12 days, resulting in an average humidity of 68%. Whether you're planning outdoor activities or cozy indoor time, be prepared for a mix of conditions!
In September in Monterey, the average temperature is 17°C (64°F). Maximum temperatures can reach 29°C (85°F), while minimum temperatures can dip as low as 1°C (34°F). Be sure to pack layers to accommodate the wide range of temperatures during your trip!
In Monterey in September, the total precipitation amount is 117 mm (4.6 in), occurring over a span of 12 days.
In Monterey in September, humidity is 68%. With an average temperature of 17°C (64°F), this humidity feels like a damp embrace that lingers on the skin, making every step feel heavier and every breath a little more labored, which can be a challenge for traveling.
In Monterey in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Monterey.
UV Risk Categories
Weather in Monterey varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Monterey, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -1°C (31°F) | 76 mm (3.0 inches) | 86% | moderate |
February Weather | 2°C (36°F) | 115 mm (4.5 inches) | 86% | high |
March Weather | 5°C (41°F) | 86 mm (3.4 inches) | 86% | very high |
April Weather | 10°C (50°F) | 126 mm (5.0 inches) | 84% | very high |
May Weather | 15°C (60°F) | 151 mm (5.9 inches) | 78% | extreme |
June Weather | 19°C (66°F) | 107 mm (4.2 inches) | 79% | extreme |
July Weather | 21°C (70°F) | 86 mm (3.4 inches) | 70% | extreme |
August Weather | 20°C (68°F) | 129 mm (5.1 inches) | 59% | very high |
September Weather | 17°C (64°F) | 117 mm (4.6 inches) | 68% | very high |
October Weather | 12°C (54°F) | 115 mm (4.5 inches) | 80% | high |
November Weather | 4°C (40°F) | 72 mm (2.8 inches) | 86% | moderate |
December Weather | 2°C (35°F) | 96 mm (3.8 inches) | 85% | moderate |