Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
San Mateo's shift from March to April is accompanied by an average high-temperature of an enjoyable 62.2°F (16.8°C), a slight deviation from 59.2°F (15.1°C). Throughout the month of April, the average temperature dips to a chilly 48.7°F (9.3°C) at night.Humidity
The average relative humidity in April is 74%.Rainfall
In April, the rain falls for 3.8 days. Throughout April, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 32.6 rainfall days, and 2.13" (54mm) of precipitation is accumulated.Daylight
In April, the average length of the day is 13h and 12min.On the first day of April, sunrise is at 6:53 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 San Mateo, 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 medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: An average UV index of 4 in April transforms into this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for San Mateo in April?
What is the average humidity in April?
How many days does it rain in April?
How many hours of daylight does San Mateo have in April?
What time are sunrise and sunset in April?
How many hours of sunshine does San Mateo have in April?
What is the UV index reading in April?
Average temperature in April
San Mateo, CA
- Average high temperature in April: 62.2°F
The warmest months (with the highest average high temperature) are August and September (71.2°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in April: 48.7°F
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46.9°F).
Average pressure in April
San Mateo, 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
San Mateo, CA
- Average wind speed in April: 8mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.9mph).
Average humidity in April
San Mateo, CA
- Average humidity in April: 74%
The months with the highest relative humidity are March and August (76%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall in April
San Mateo, CA
- Average rainfall in April: 0.08"
The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and August (0").
Average rainfall days in April
San Mateo, CA
- Average rainfall days in April: 3.8 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is July (0.3 days).
Average daylight in April /
Average sunshine in April
San Mateo, CA
- Average daylight in April: 13h 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 April: 10h and 2min
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 54min).
Average sunshine days in April
San Mateo, CA
- Average sunshine days in April: 25.4 days
The month with the most sunshine days is July (30.4 days).
The month with the least sunshine days is February (23.3 days).
Average UV index in April
San Mateo, 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 February and December (UV index 3).
Average cloud cover in April
San Mateo, 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 11).
Average visibility in April
San Mateo, 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).
San Mateo, California, USA
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