July weather forecastCastro Valley, CA
July
Weather in July
July, like June, in Castro Valley, California, is a moderately hot summer month, with an average temperature ranging between min 55.2°F (12.9°C) and max 80.2°F (26.8°C).Temperature
Castro Valley's temperatures tend to reach their peak averages in July, with a high of 80.2°F (26.8°C) and a low of 55.2°F (12.9°C).Humidity
In July, the average relative humidity is 63%.Rainfall
July and August are months with the least rain when the rain falls for 1.5 days and typically aggregates up to 0.04" (1mm) of rain.Daylight
In Castro Valley, the average length of the day in July is 14h and 28min.On the first day of the month, sunrise is at 5:50 am and sunset at 8:34 pm. On the last day of July, in Castro Valley, sunrise is at 6:11 am and sunset at 8:17 pm PDT.
Sunshine
July has the most sunshine of the year, with an average of 12.1h of sunshine.UV index
In July, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A typical high UV index of 5 in July suggests the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Castro Valley, CA
- Average high temperature in July: 80.2°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in July: 55.2°F
The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (43.7°F).
Average pressure in July
Castro Valley, CA
- Average pressure in July: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in July
Castro Valley, CA
- Average wind speed in July: 5.7mph
The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in July
Castro Valley, CA
- Average humidity in July: 63%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (61%).
Average rainfall in July
Castro Valley, CA
- Average rainfall in July: 0.04"
The wettest month (with the highest rainfall) is February (2.28").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in July
Castro Valley, CA
- Average rainfall days in July: 1.5 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (0.9 days).
Average daylight in July /
Average sunshine in July
Castro Valley, 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 6min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in July
Castro Valley, CA
- Average sunshine days in July: 28.8 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in July
Castro Valley, CA
- Average UV index in July: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in July
Castro Valley, CA
- Average cloud cover in July: 7
The months with the most cloud cover are March and December (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in July
Castro Valley, 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).
