September Weather in Mountain View

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%.

11°C (52°F)

Minimum temperature

22°C (73°F)

Average temperature

33°C (92°F)

Maximum temperature

75%

Humidity

Precipitation and Sunshine hours

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.

126 mm (4.9 inches)

Precipitation

11 rainy days

Rainy days

9 hours 19 minutes

Sunshine hours

53%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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

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