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July Weather in Foster City, United States

Last updated: June 24, 2025

In July, the average temperature in Foster City, United States is a comfortable 17°C (63°F), with minimums dropping to 11°C (53°F) and maximums peaking at 29°C (84°F). Enjoy delightful weather with 0 mm (0.0 in) of precipitation across 0 days, complemented by an average humidity level of 58%. Perfect for outdoor adventures!

July Temperature in Foster City

In July in Foster City, the average temperature is 17°C (63°F). Maximums can reach 29°C (84°F), while minimums can drop to as low as 11°C (53°F). This makes Foster City an ideal destination for travelers seeking mild weather and comfortable conditions for outdoor activities.

July Weather in Foster City: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Foster City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Foster City, July typically has an average temperature of 17°C (63°F), with highs reaching up to 29°C (84°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec525354565863636565625652
Data source: Temperature data for Foster City generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

July Precipitation in Foster City

In Foster City in July, the precipitation amount is 0 mm (0.0 in) during 0 days.

July Precipitation Trends in Foster City

The chart displays monthly precipitation patterns in Foster City, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Foster City, July typically receives around 0 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec1051008633242012244788
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Foster City

In Foster City in July humidity is 58%. With an average temperature of 17°C (63°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as long as you stay hydrated and dress in light layers.

July Average Humidity in Foster City

This chart illustrates the average monthly humidity levels in Foster City, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Foster City is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Foster City

In Foster City in July, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Foster City.

Maximum UV Index Levels in Foster City for July

The chart shows the monthly maximum UV Index (UVI) for Foster City in July, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In July, the maximum UV index in Foster City typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: Foster City July UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How July Weather in Foster City Compares to Other Months

Weather in Foster City varies notably across the year, with each month offering distinct climate conditions. This page compares July’s weather to other months in Foster City, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Foster City, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)105 mm (4.1 inches)82%moderate
February Weather11°C (53°F)100 mm (3.9 inches)84%moderate
March Weather12°C (54°F)86 mm (3.4 inches)82%very high
April Weather13°C (57°F)33 mm (1.3 inches)78%very high
May Weather15°C (59°F)24 mm (0.9 inches)71%very high
June Weather17°C (63°F)2 mm (0.1 inches)64%extreme
July Weather17°C (63°F)0 mm (0.0 inches)58%extreme
August Weather18°C (65°F)0 mm (0.0 inches)54%very high
September Weather18°C (66°F)2 mm (0.1 inches)55%very high
October Weather17°C (63°F)24 mm (0.9 inches)62%high
November Weather13°C (56°F)47 mm (1.9 inches)78%moderate
December Weather11°C (52°F)88 mm (3.5 inches)80%moderate

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