Last updated: March 2, 2024
The weather in Mountain View, United States, during September is characterized by an average temperature of 22°C (73°F). Highs can soar to 33°C (92°F), while lows may dip to 11°C (52°F). Typically, the humidity level in Mountain View throughout September hovers around 75%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Mountain View averages 126 mm (4.9 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 12 hours 21 minutes of daylight, with the sun shining for approximately 9 hours 19 minutes each day. Additionally, there is a 53% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Mountain View reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 2 | 4 | 6 | 8 | 9 | 9 | 7 | 5 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||