Sunnyvale, CA weather in April
In April, Sunnyvale sees highs around 68°F and lows around 49°F: mild and mostly dry. Rain falls on about 6 days. Great for outdoor plans.
- Normal high
- 68°F
- Normal low
- 49°F
- Wet days
- 6
- 1.0 in total
- Muggy days
- 0
- dew point 65°F+
How April changes from start to finish
| April 1 | April 30 | |
|---|---|---|
| Normal high | 66°F | 70°F |
| Normal low | 48°F | 51°F |
| Chance of a wet day | 25% | 14% |
| Sunrise / sunset | 6:53 am / 7:30 pm | 6:14 am / 7:56 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 (25 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°F18 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 1.0 in; a dry April brings about 0.3 in and a wet one about 1.4 in (25th and 75th percentiles). Days with half an inch or more are rare.
How April varies from year to year
- Warmest April, 1991-20201992: average high 74°F
- Coolest April2003: average high 63°F
- Wettest April2010: 2.6 in
- Driest April2008: 0.02 in
- Highest reading93°F (April 20, 2009)
- Lowest reading38°F (April 14, 2001)
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 | 65°F | 68°F | 72°F |
| Normal low | 47°F | 49°F | 53°F |
| Wet days | 10 | 6 | 3 |
| Comfortable days | 16 | 18 | 24 |
| Daylight | 12.0 h | 13.2 h | 14.2 h |
Highs change by +3°F from March and +4°F into May.
Nearby alternatives in April
- Warmer: Tracy, CA42 mi · high 75°F · 5 wet days
- Cooler: San Francisco, CA35 mi · high 63°F · 7 wet days
How Sunnyvale ranks in April
- Normal high194th warmest of 378 cities; 48th of 60 in California
- Wet days84th driest of 378
- Comfortable days28th most of 340
Heating and cooling
April has 205 heating degree days and 9 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How cold is Sunnyvale in April?
The normal high is 68°F and the normal low is 49°F. From 1991 to 2020 the coldest April reading was 38°F (most recently on April 14, 2001).
Does it rain a lot in Sunnyvale in April?
About 6 days in April have at least 0.01 in of precipitation, and the normal total is 1.0 in. The wettest April in 1991-2020 was in 2010 (2.6 in); the driest was in 2008 (0.02 in).
Is April a good time to visit Sunnyvale?
April ranks 7th of 12 months on our comfort score for Sunnyvale (77 out of 100). It has about 18 comfortable days. The best months are May, June and July.
Where the numbers come from
- Temperature, rain and frost dates: Moffett Federal Airfield (USW00023244), 2.6 mi NNW of the city center, 39 ft (85 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall: Palo Alto (USC00046646), 7.7 mi NW of the city center, 25 ft (99 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snow depth: Newark (USC00046144), 10 mi N of the city center, 10 ft (114 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: San Francisco Intl Airport (USW00023234), 25 mi NW of the city center, 8 ft (116 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: N Y. Mineta Sn Jo Intl Apt (724945-23293), 6.2 mi E of the city center, 49 ft (75 ft lower than the city). Hourly observations, 1991-2020.