San Mateo, CA weather in April
In April, San Mateo sees highs around 66°F and lows around 49°F: mild, with some rain. Rain falls on about 6 days. Good for outdoor plans.
- Normal high
- 66°F
- Normal low
- 49°F
- Wet days
- 6
- 1.4 in total
- Muggy days
- 0
- dew point 65°F+
How April changes from start to finish
| April 1 | April 30 | |
|---|---|---|
| Normal high | 64°F | 67°F |
| Normal low | 48°F | 50°F |
| Chance of a wet day | 27% | 16% |
| Sunrise / sunset | 6:54 am / 7:31 pm | 6:14 am / 7:58 pm |
| Daylight | 12.6 h | 13.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical April day
- 6 am51°Fdew point 46°F
- 9 am57°Fdew point 47°F
- Noon62°Fdew point 47°F
- 3 pm62°Fdew point 46°F
- 6 pm57°Fdew point 46°F
- 9 pm54°Fdew point 46°F
NOAA hourly normals (local standard time) from San Francisco Intl Airport (5 mi away); average wind 12 mph; clear or few clouds in 38% of daytime hours, mostly cloudy or overcast in 42%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F12 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph1 of 30
- Hot dayshigh 90°F or more0 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow6 of 30
- Notable rainat least 0.10 in3 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per April, counted from daily records for each year 1991-2020.
Rain in April
Normal precipitation is 1.4 in; a dry April brings about 0.4 in and a wet one about 2.1 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How April varies from year to year
- Warmest April, 1991-20201992: average high 69°F
- Coolest April2003: average high 60°F
- Wettest April2003: 4.4 in
- Driest April2008: 0.03 in
- Highest reading91°F (April 20, 2009)
- Lowest reading39°F (April 9, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
April compared with March and May
| March | April | May | |
|---|---|---|---|
| Normal high | 63°F | 66°F | 68°F |
| Normal low | 48°F | 49°F | 52°F |
| Wet days | 10 | 6 | 3 |
| Comfortable days | 9 | 12 | 18 |
| Daylight | 12.0 h | 13.2 h | 14.2 h |
Highs change by +3°F from March and +2°F into May.
Nearby alternatives in April
- Warmer: Concord, CA33 mi · high 71°F · 5 wet days
- Cooler: South Lake Tahoe, CA158 mi · high 53°F · 7 wet days
How San Mateo ranks in April
- Normal high211th warmest of 378 cities; 53rd of 60 in California
- Wet days99th driest of 378
- Comfortable days164th most of 340
Heating and cooling
April has 234 heating degree days and 5 cooling degree days (base 65°F), 9% of the year's total heating and cooling demand.
Questions
How cold is San Mateo in April?
The normal high is 66°F and the normal low is 49°F. From 1991 to 2020 the coldest April reading was 39°F (April 9, 1999).
Does it rain a lot in San Mateo in April?
About 6 days in April have at least 0.01 in of precipitation, and the normal total is 1.4 in. The wettest April in 1991-2020 was in 2003 (4.4 in); the driest was in 2008 (0.03 in).
Is April a good time to visit San Mateo?
April ranks 7th of 12 months on our comfort score for San Mateo (68 out of 100). It has about 12 comfortable days. The best months are July and August.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: San Francisco Intl Airport (USW00023234), 4.5 mi NNW of the city center, 8 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Redwood City (USC00047339), 7.6 mi SE of the city center, 31 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Francisco International Airport (724940-23234), 4.5 mi NNW of the city center, 10 ft . Hourly observations, 1991-2020.