Last updated: August 27, 2025
In Berkeley, United Kingdom, the average temperature in September hovers around 15°C (59°F), with a minimum dipping to 3°C (39°F) and a pleasant maximum reaching 29°C (85°F). Expect a bit of rain, as the region sees about 51 mm (2.0 in) of precipitation over roughly 8 days. With an average humidity level of 79%, the air tends to feel quite moist and comfortable.
In September in Berkeley, the average temperature is 15°C (59°F). Maximums can reach 29°C (85°F) and minimums can be as low as 3°C (39°F). This makes Berkeley a perfect destination for travelers seeking a mild climate with the potential for warmer days and cooler nights.
In Berkeley in September, the total precipitation amount is 51 mm (2.0 in), spread over a duration of 8 days.
In Berkeley in September humidity is 79%. With an average temperature of 15°C (59°F), this humidity feels like a muggy embrace that clings to your skin, making outdoor activities somewhat uncomfortable. Travelers may find themselves frequently seeking shelter or refreshing drinks to combat the warm, damp air, as the moisture in the atmosphere feels particularly heavy, especially during longer excursions.
In Berkeley in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Berkeley, you can refer to this Hourly UV Index in Berkeley.
UV Risk Categories
Weather in Berkeley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Berkeley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 50 mm (2.0 inches) | 88% | low |
| February Weather | 6°C (43°F) | 60 mm (2.4 inches) | 88% | low |
| March Weather | 7°C (46°F) | 67 mm (2.7 inches) | 86% | moderate |
| April Weather | 9°C (49°F) | 48 mm (1.9 inches) | 84% | moderate |
| May Weather | 12°C (55°F) | 72 mm (2.9 inches) | 80% | high |
| June Weather | 16°C (61°F) | 71 mm (2.8 inches) | 80% | very high |
| July Weather | 18°C (65°F) | 61 mm (2.4 inches) | 70% | very high |
| August Weather | 17°C (63°F) | 72 mm (2.9 inches) | 73% | high |
| September Weather | 15°C (59°F) | 51 mm (2.0 inches) | 79% | high |
| October Weather | 12°C (53°F) | 93 mm (3.6 inches) | 89% | moderate |
| November Weather | 8°C (47°F) | 66 mm (2.6 inches) | 90% | low |
| December Weather | 7°C (44°F) | 84 mm (3.3 inches) | 89% | low |