July weather forecastFoster City, CA

July

Weather in July

July, the same as June, in Foster City, California, is an agreeable summer month, with an average temperature varying between 70.9°F (21.6°C) and 54.7°F (12.6°C).

Temperature

The arrival of July brings an average high-temperature of a still agreeable 70.9°F (21.6°C), nearly identical to June's 68.5°F (20.3°C). In July, the nighttime temperature lowers to an average of 54.7°F (12.6°C).

Humidity

In July, the average relative humidity is 75%.

Rainfall

In Foster City, rain does not fall in June through August.

Daylight

The average length of the day in July is 14h and 27min.
On the first day of July, sunrise is at 5:51 am and sunset at 8:34 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:17 pm PDT.

Sunshine

With an average of 12h of sunshine, July has the most sunshine of the year in Foster City.

UV index

June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: In July, the average maximum UV index of 5 translates into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.

Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In July, in Foster City, the average high-temperature is 70.9°F (21.6°C), and the average low-temperature is 54.7°F (12.6°C).

In Foster City, the average relative humidity in July is 75%.

In Foster City, rain does not fall in June through August.

In Foster City, California, the average day length in July is 14h and 27min.

In July, on the first day of the month, sunrise is at 5:51 am and sunset at 8:34 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:17 pm PDT.

With an average of 12h of sunshine, July has the most sunshine of the year.

In July, the average sunshine duration is 12h.

June through September, with an average maximum UV index of 5, are months with the highest UV index.

In July, the average daily maximum UV index in Foster City is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J July A S O N D

Jun

July

Aug

Average high temperature

68.5°F

70.9°F

71.2°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.8mph

6.6mph

6.5mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

29.3

30.4

30.2

Average UV index

Average cloud cover

Average visibility

Average temperature in July
Foster City, CA

Average high temperature in July: 70.9°F

The warmest months (with the highest average high temperature) are August and September (71.2°F).
The month with the lowest average high temperature is December (55.8°F).

Average low temperature in July: 54.7°F

The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).

Average pressure in July
Foster City, CA

Average pressure in July: 29.93"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

Average wind speed in July
Foster City, CA

Average wind speed in July: 6mph

The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.9mph).

Average humidity in July
Foster City, CA

Average humidity in July: 75%

The months with the highest relative humidity are March and August (76%).
The months with the lowest relative humidity are October and November (70%).

Average rainfall in July
Foster City, CA

Average rainfall in July: 0"

The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and August (0").

Average rainfall days in July
Foster City, CA

Average rainfall days in July: 0.3 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is July (0.3 days).

Average daylight in July /
Average sunshine in July
Foster City, CA

Average daylight in July: 14h and 30min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

Average sunshine in July: 12h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

Average sunshine days in July
Foster City, CA

Average sunshine days in July: 30.4 days

The month with the most sunshine days is July (30.4 days).
The month with the least sunshine days is February (23.3 days).

Average UV index in July
Foster City, CA

Average UV index in July: 5

The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).

Average cloud cover in July
Foster City, CA

Average cloud cover in July: 11

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 11).

Average visibility in July
Foster City, CA

Average visibility in July: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).