Napa, CA weather in April
April in Napa: mild, with some rain. Highs 72°F, lows 46°F, rain on about 7 days. A great month for outdoor plans.
- Normal high
- 72°F
- Normal low
- 46°F
- Wet days
- 7
- 1.7 in total
- Muggy days
- 0
- dew point 65°F+
How April changes from start to finish
| April 1 | April 30 | |
|---|---|---|
| Normal high | 70°F | 74°F |
| Normal low | 44°F | 47°F |
| Chance of a wet day | 26% | 18% |
| Sunrise / sunset | 6:53 am / 7:31 pm | 6:13 am / 7:59 pm |
| Daylight | 12.6 h | 13.8 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 am49°Fdew point 44°F
- 9 am60°Fdew point 46°F
- Noon67°Fdew point 46°F
- 3 pm69°Fdew point 46°F
- 6 pm63°Fdew point 47°F
- 9 pm54°Fdew point 46°F
NOAA hourly normals (local standard time) from Travis AFB (19 mi away); average wind 12 mph; clear or few clouds in 59% of daytime hours, mostly cloudy or overcast in 32%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F19 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in4 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 1.7 in; a dry April brings about 0.6 in and a wet one about 1.9 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How April varies from year to year
- Warmest April, 1991-20202013: average high 78°F
- Coolest April2003: average high 66°F
- Wettest April2006: 5.8 in
- Driest April2008: 0.2 in
- Highest reading95°F (April 22, 2009)
- Lowest reading32°F (April 21, 2008)
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 | 68°F | 72°F | 77°F |
| Normal low | 44°F | 46°F | 50°F |
| Wet days | 10 | 7 | 4 |
| Comfortable days | 18 | 19 | 21 |
| Daylight | 12.0 h | 13.2 h | 14.3 h |
Highs change by +4°F from March and +5°F into May.
Nearby alternatives in April
- Cooler: San Francisco, CA37 mi · high 63°F · 7 wet days
How Napa ranks in April
- Normal high157th warmest of 378 cities; 36th of 60 in California
- Wet days112th driest of 378
- Comfortable days20th most of 340
What to pack for Napa in April
- Layers – afternoons near 72°F but nights near 46°F
Heating and cooling
April has 197 heating degree days and 12 cooling degree days (base 65°F), 7% of the year's total heating and cooling demand.
Questions
How hot is Napa in April?
The normal high is 72°F and the normal low is 46°F. From 1991 to 2020 the hottest April reading was 95°F (most recently on April 22, 2009).
Does it rain a lot in Napa in April?
About 7 days in April have at least 0.01 in of precipitation, and the normal total is 1.7 in. The wettest April in 1991-2020 was in 2006 (5.8 in); the driest was in 2008 (0.2 in).
Is April a good time to visit Napa?
April ranks 2nd of 12 months on our comfort score for Napa (77 out of 100). It has about 19 comfortable days and about 1 day at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall and frost dates: Napa State Hospital (USC00046074), 1.8 mi SE of the city center, 35 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Fairfield (USC00042934), 12 mi E of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Travis AFB (USW00023202), 19 mi E of the city center, 59 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Napa County Airport (724955-93227), 6.2 mi S of the city center, 15 ft . Hourly observations, 1991-2020.