Last updated: June 24, 2025
In September, the average temperature in Livermore, United States is a delightful 23°C (74°F). However, prepare for a range, as temperatures can dip to a chilly 8°C (46°F) or soar to a scorching 37°C (98°F). During this month, expect approximately 97 mm (3.8 in) of precipitation spread over 8 days, contributing to an average humidity level of 71%. Whether you’re enjoying the warmth or braving the rain, Livermore offers a dynamic climate perfect for adventure!
In September in Livermore, the average temperature is 23°C (74°F). Maximum can reach 37°C (98°F) and minimum can be as low as 8°C (46°F). This range makes it a great time for travelers to enjoy a mix of warm days and cooler evenings.
In Livermore in September, the total precipitation amount is 97 mm (3.8 in), occurring over a span of 8 days.
In Livermore in September, humidity is 71%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace that can make outdoor activities feel sticky, but if you're well-hydrated and take breaks in the shade, it offers a pleasant tropical ambiance perfect for exploration.
In Livermore 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 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 | 3°C (37°F) | 92 mm (3.6 inches) | 87% | moderate |
| February Weather | 5°C (41°F) | 141 mm (5.5 inches) | 86% | high |
| March Weather | 10°C (50°F) | 126 mm (4.9 inches) | 86% | high |
| April Weather | 14°C (58°F) | 147 mm (5.8 inches) | 82% | very high |
| May Weather | 21°C (70°F) | 123 mm (4.8 inches) | 82% | very high |
| June Weather | 25°C (77°F) | 123 mm (4.8 inches) | 83% | extreme |
| July Weather | 27°C (80°F) | 96 mm (3.8 inches) | 80% | very high |
| August Weather | 25°C (78°F) | 88 mm (3.4 inches) | 74% | very high |
| September Weather | 23°C (74°F) | 97 mm (3.8 inches) | 71% | very high |
| October Weather | 17°C (62°F) | 119 mm (4.7 inches) | 78% | high |
| November Weather | 8°C (47°F) | 88 mm (3.5 inches) | 88% | moderate |
| December Weather | 6°C (43°F) | 104 mm (4.1 inches) | 88% | moderate |