April weather forecastAtherton, CA
April
Weather in April
April is an enjoyable spring month in Atherton, California, with an average temperature ranging between min 48.2°F (9°C) and max 62.8°F (17.1°C).Temperature
April denotes a minimal variation in the average high-temperature to an enjoyable 62.8°F (17.1°C) from March's 59.9°F (15.5°C). Throughout April, an average low-temperature of 48.2°F (9°C) is expected.Humidity
In April, the average relative humidity is 73%.Rainfall
In April, the rain falls for 7.8 days. Throughout April, 0.67" (17mm) of precipitation is accumulated. In Atherton, during the entire year, the rain falls for 73.4 days and collects up to 11.89" (302mm) of precipitation.Daylight
The average length of the day in April is 13h and 11min.On the first day of April, sunrise is at 6:52 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 7:58 pm PDT.
Sunshine
In Atherton, the average sunshine in April is 10.3h.UV index
In April, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high UV index of 4 in April translates into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Atherton, CA
- Average high temperature in April: 62.8°F
The warmest months (with the highest average high temperature) are July and August (73°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in April: 48.2°F
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is February (46°F).
Average pressure in April
Atherton, CA
- Average pressure in April: 30.04"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 April
Atherton, CA
- Average wind speed in April: 7.5mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.5mph).
Average humidity in April
Atherton, CA
- Average humidity in April: 73%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).
Average rainfall in April
Atherton, CA
- Average rainfall in April: 0.67"
The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in April
Atherton, CA
- Average rainfall days in April: 7.8 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).
Average daylight in April /
Average sunshine in April
Atherton, 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 18min
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 48min).
Average sunshine days in April
Atherton, CA
- Average sunshine days in April: 21.3 days
The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in April
Atherton, CA
- Average UV index in April: 4
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in April
Atherton, CA
- Average cloud cover in April: 27
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in April
Atherton, 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).
