April weather forecastLos Altos, CA
April
Weather in April
April, like March, in Los Altos, California, is another refreshing spring month, with an average temperature fluctuating between 46°F (7.8°C) and 66.2°F (19°C).Temperature
At the onset of April, Los Altos records an average high-temperature of a still enjoyable 66.2°F (19°C), showing little deviation from the preceding month. April in Los Altos is noted for a mean low-temperature of 46°F (7.8°C).Humidity
In Los Altos, the average relative humidity in April is 70%.Rainfall
In Los Altos, in April, during 5.8 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. Throughout the year, in Los Altos, there are 53.1 rainfall days, and 4.41" (112mm) of precipitation is accumulated.Daylight
In April, the average length of the day in Los Altos, California, is 13h and 11min.On the first day of April in Los Altos, sunrise is at 6:52 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 7:57 pm PDT.
Sunshine
The average sunshine in April is 10.5h.UV index
In April, the average daily maximum UV index in Los Altos, California, is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In April, the maximum UV index of 5 suggests these recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Los Altos, CA
- Average high temperature in April: 66.2°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (56.5°F).
- Average low temperature in April: 46°F
The month with the highest average low temperature is August (56.8°F).
The coldest month (with the lowest average low temperature) is December (44.1°F).
Average pressure in April
Los Altos, CA
- Average pressure in April: 30.04"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June and September (29.92"Hg).
Average wind speed in April
Los Altos, CA
- Average wind speed in April: 6.2mph
The windiest months (with the highest average wind speed) are April and May (6.2mph).
The calmest months (with the lowest average wind speed) are August, September, October and November (4.7mph).
Average humidity in April
Los Altos, CA
- Average humidity in April: 70%
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July, September and October (63%).
Average rainfall in April
Los Altos, CA
- Average rainfall in April: 0.28"
The wettest months (with the highest rainfall) are February, March and December (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days in April
Los Altos, CA
- Average rainfall days in April: 5.8 days
The month with the highest number of rainy days is March (10 days).
The month with the least rainy days is August (0.4 days).
Average daylight in April /
Average sunshine in April
Los Altos, CA
- Average daylight in April: 13h and 12min
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 April: 10h and 30min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in April
Los Altos, CA
- Average sunshine days in April: 23.2 days
The months with the most sunshine days are July and August (29.8 days).
The month with the least sunshine days is March (19.4 days).
Average UV index in April
Los Altos, CA
- Average UV index in April: 5
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in April
Los Altos, CA
- Average cloud cover in April: 26
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in April
Los Altos, CA
- Average visibility in April: 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).
