Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
With the arrival of May, Castro Valley's average high-temperature registers at an agreeable 70.3°F (21.3°C), indicating a subtle variation from the previous month. Castro Valley encounters a steady low-temperature average of 49.1°F (9.5°C) throughout the month of May.Humidity
In May, the average relative humidity is 67%.Rainfall
In Castro Valley, in May, it is raining for 4.3 days, with typically 0.51" (13mm) of accumulated precipitation. In Castro Valley, 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 May is 14h and 13min.On the first day of the month, sunrise is at 6:11 am and sunset at 7:59 pm. On the last day of May, sunrise is at 5:48 am and sunset at 8:24 pm PDT.
Sunshine
In Castro Valley, the average sunshine in May is 10.9h.UV index
In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In May, the maximum UV index of 5 transforms into these recommendations:
Take necessary precautions - Defending against sun damage is advocated. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May in Castro Valley?
What is the average humidity in May in Castro Valley?
How much does it rain in Castro Valley in May?
How many hours of daylight does Castro Valley have in May?
What time are sunrise and sunset in May in Castro Valley?
How long on average sun shines in May in Castro Valley?
What is the UV index reading in May in Castro Valley?
Average temperature in May
Castro Valley, CA
- Average high temperature in May: 70.3°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 May: 49.1°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 May
Castro Valley, CA
- Average pressure in May: 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 May
Castro Valley, CA
- Average wind speed in May: 6.6mph
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 May
Castro Valley, CA
- Average humidity in May: 67%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (61%).
Average rainfall in May
Castro Valley, CA
- Average rainfall in May: 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 May
Castro Valley, CA
- Average rainfall days in May: 4.3 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 May /
Average sunshine in May
Castro Valley, CA
- Average daylight in May: 14h 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 May: 10h and 5min
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 May
Castro Valley, CA
- Average sunshine days in May: 26 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 May
Castro Valley, CA
- Average UV index in May: 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 May
Castro Valley, CA
- Average cloud cover in May: 22
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 May
Castro Valley, CA
- Average visibility in May: 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
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