April weather forecastSan Rafael, CA
April
Weather in April
April is a refreshing spring month in San Rafael, California, with an average temperature fluctuating between 62.8°F (17.1°C) and 48.6°F (9.2°C).Temperature
San Rafael's shift into April is marked by a subtle change to an enjoyable 62.8°F (17.1°C) from March's 59.4°F (15.2°C) in temperature. San Rafael's April nights cool down to an average low-temperature of 48.6°F (9.2°C).Humidity
In San Rafael, the average relative humidity in April is 74%.Rainfall
In April, the rain falls for 5.5 days. Throughout April, 0.2" (5mm) of precipitation is accumulated. In San Rafael, during the entire year, the rain falls for 48 days and collects up to 3.94" (100mm) of precipitation.Daylight
In San Rafael, the average length of the day in April is 13h and 13min.On the first day of April, sunrise is at 6:53 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:00 pm PDT.
Sunshine
In San Rafael, the average sunshine in April is 10h.UV index
April, June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: A maximum high UV index of 5 in April translates into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
San Rafael, CA
- Average high temperature in April: 62.8°F
The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in April: 48.6°F
The month with the highest average low temperature is September (56.1°F).
The coldest month (with the lowest average low temperature) is December (45.3°F).
Average pressure in April
San Rafael, CA
- Average pressure in April: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in April
San Rafael, CA
- Average wind speed in April: 7.6mph
The windiest month (with the highest average wind speed) is May (7.8mph).
The calmest months (with the lowest average wind speed) are October and November (5.5mph).
Average humidity in April
San Rafael, CA
- Average humidity in April: 74%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (68%).
Average rainfall in April
San Rafael, CA
- Average rainfall in April: 0.2"
The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in April
San Rafael, CA
- Average rainfall days in April: 5.5 days
The month with the highest number of rainy days is March (8.8 days).
The months with the least rainy days are June and August (1.2 days).
Average daylight in April /
Average sunshine in April
San Rafael, CA
- Average daylight in April: 13h and 12min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in April: 10h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in April
San Rafael, CA
- Average sunshine days in April: 23.3 days
The month with the most sunshine days is June (26.4 days).
The month with the least sunshine days is March (20.7 days).
Average UV index in April
San Rafael, CA
- Average UV index in April: 5
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in April
San Rafael, CA
- Average cloud cover in April: 30
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).
Average visibility in April
San Rafael, 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).
