Last updated: June 24, 2025
In September, the average temperature in Livermore, United States is a mild 16°C (61°F), with a minimum dipping to -1°C (31°F) and a maximum soaring up to 31°C (88°F). Expect about 69 mm (2.7 in) of precipitation spread over 8 days and an average humidity level of 77%, creating a pleasantly damp atmosphere.
In September in Livermore, the average temperature is 16°C (61°F), with maximums reaching 31°C (88°F) and minimums dropping as low as -1°C (31°F). It's a great time for travelers to enjoy a mix of warm days and cool nights while exploring the beauty of Livermore.
In Livermore in September, the precipitation amount is 69 mm (2.7 in) that falls over a period of 8 days.
In Livermore in September humidity is 77%. With an average temperature of 16°C (61°F), this humidity feels like a slight heaviness in the air, making every step feel a touch more effortful while traveling. The dampness clings to your skin, adding a layer of discomfort, yet the mild temperature invites you to explore the surroundings, blending the challenge of the humidity with an opportunity for a refreshing adventure.
In Livermore 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 Livermore.
UV Risk Categories
Weather in Livermore varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Livermore, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (20°F) | 83 mm (3.3 inches) | 91% | low |
| February Weather | -5°C (22°F) | 85 mm (3.4 inches) | 89% | moderate |
| March Weather | -1°C (30°F) | 73 mm (2.9 inches) | 85% | moderate |
| April Weather | 6°C (42°F) | 126 mm (5.0 inches) | 84% | very high |
| May Weather | 12°C (54°F) | 85 mm (3.4 inches) | 78% | very high |
| June Weather | 18°C (65°F) | 80 mm (3.1 inches) | 72% | very high |
| July Weather | 21°C (70°F) | 128 mm (5.0 inches) | 75% | very high |
| August Weather | 20°C (68°F) | 88 mm (3.5 inches) | 74% | very high |
| September Weather | 16°C (61°F) | 69 mm (2.7 inches) | 77% | high |
| October Weather | 10°C (49°F) | 129 mm (5.1 inches) | 85% | moderate |
| November Weather | 2°C (35°F) | 110 mm (4.3 inches) | 86% | moderate |
| December Weather | -4°C (25°F) | 117 mm (4.6 inches) | 85% | low |