Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
Castro Valley's progression into October involves a gentle drop in the average high-temperature, from a warm 79°F (26.1°C) in September to an agreeable 72.5°F (22.5°C). October nights experience a consistent temperature drop to a cool 54.3°F (12.4°C).Humidity
The average relative humidity in October is 62%.Rainfall
In Castro Valley, California, during October, the rain falls for 4.6 days and regularly aggregates up to 0.51" (13mm) of precipitation. In Castro Valley, California, during the entire year, the rain falls for 69.2 days and collects up to 11.1" (282mm) of precipitation.Daylight
The average length of the day in October in Castro Valley is 11h and 12min.On the first day of October in Castro Valley, sunrise is at 7:04 am and sunset at 6:50 pm. On the last day of the month, sunrise is at 7:33 am and sunset at 6:10 pm PDT.
Sunshine
In October, the average sunshine is 7.1h.UV index
In October, the average daily maximum UV index in Castro Valley, California, is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: In October, the maximum UV index of 4 suggests this advice:
Guard yourself - Precautionary measures against sun damage are advocated. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Castro Valley in October?
What is the average humidity in October in Castro Valley?
How many days does it rain in October in Castro Valley?
What is the average length of the day in October in Castro Valley?
When are sunrise and sunset in October in Castro Valley?
How long on average sun shines in October in Castro Valley?
What is the UV index reading in October in Castro Valley?
Average temperature in October
Castro Valley, CA
- Average high temperature in October: 72.5°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 October: 54.3°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 October
Castro Valley, CA
- Average pressure in October: 29.98"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 October
Castro Valley, CA
- Average wind speed in October: 4.7mph
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 October
Castro Valley, CA
- Average humidity in October: 62%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (61%).
Average rainfall in October
Castro Valley, CA
- Average rainfall in October: 0.51"
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 October
Castro Valley, CA
- Average rainfall days in October: 4.6 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 October /
Average sunshine in October
Castro Valley, CA
- Average daylight in October: 11h and 1min
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 October: 7h and 1min
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 October
Castro Valley, CA
- Average sunshine days in October: 25.5 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 October
Castro Valley, CA
- Average UV index in October: 4
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 October
Castro Valley, CA
- Average cloud cover in October: 16
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 October
Castro Valley, CA
- Average visibility in October: 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).
Castro Valley, California, USA
Weather forecast for your location
2. Allow the app to use your location