April Weather in Foster City

Last updated: March 2, 2024

The weather in Foster City, United States, during April is characterized by an average temperature of 13°C (57°F). Highs can soar to 26°C (79°F), while lows may dip to 7°C (44°F). Typically, the humidity level in Foster City throughout April hovers around 78%.

7°C (44°F)

Minimum temperature

13°C (57°F)

Average temperature

26°C (79°F)

Maximum temperature

78%

Humidity

Precipitation and Sunshine hours

In April, Foster City averages 33 mm (1.3 inches) of rainfall, typically over the course of 5 rainy days. The month enjoys an average of 13 hours 11 minutes of daylight, with the sun shining for approximately 9 hours 52 minutes each day. Additionally, there is a 45% probability of sunny days during this period.

33 mm (1.3 inches)

Precipitation

5 rainy days

Rainy days

9 hours 52 minutes

Sunshine hours

45%

Chance of sun

UV Index

In April, the UV Index in Foster City 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 3 5 7 8 9 8 7 4 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

Compare Foster City's Climate with Cities Worldwide