Napa, CA weather in March
In March, Napa sees highs around 68°F and lows around 44°F: mild, with some rain. Expect about 10 wet days. Good for outdoor plans.
- Normal high
- 68°F
- Normal low
- 44°F
- Wet days
- 10
- 3.7 in total
- Muggy days
- 0
- dew point 65°F+
How March changes from start to finish
| March 1 | March 31 | |
|---|---|---|
| Normal high | 66°F | 70°F |
| Normal low | 43°F | 44°F |
| Chance of a wet day | 34% | 28% |
| Sunrise / sunset | 6:40 am / 6:01 pm | 6:55 am / 7:31 pm |
| Daylight | 11.3 h | 12.6 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 March day
- 6 am46°Fdew point 42°F
- 9 am55°Fdew point 46°F
- Noon62°Fdew point 46°F
- 3 pm64°Fdew point 46°F
- 6 pm59°Fdew point 47°F
- 9 pm52°Fdew point 45°F
NOAA hourly normals (local standard time) from Travis AFB (19 mi away); average wind 10 mph; clear or few clouds in 52% of daytime hours, mostly cloudy or overcast in 38%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F18 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow10 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per March, counted from daily records for each year 1991-2020.
Rain in March
Normal precipitation is 3.7 in; a dry March brings about 1.0 in and a wet one about 4.9 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more. Snow is very rare.
How March varies from year to year
- Warmest March, 1991-20202004: average high 76°F
- Coolest March2006: average high 59°F
- Wettest March1995: 12.0 in
- Driest March2015: 0.1 in
- Highest reading88°F (March 16, 2004)
- Lowest reading30°F (March 11, 2006)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
March compared with February and April
| February | March | April | |
|---|---|---|---|
| Normal high | 63°F | 68°F | 72°F |
| Normal low | 42°F | 44°F | 46°F |
| Wet days | 11 | 10 | 7 |
| Comfortable days | 12 | 18 | 19 |
| Daylight | 10.8 h | 12.0 h | 13.2 h |
Highs change by +5°F from February and +4°F into April.
Nearby alternatives in March
- Drier: Reno, NV158 mi · high 59°F · 6 wet days
- Cooler: San Francisco, CA37 mi · high 62°F · 11 wet days
How Napa ranks in March
- Normal high129th warmest of 378 cities; 32nd of 60 in California
- Wet days211th driest of 378
- Comfortable days25th most of 339
What to pack for Napa in March
- A rain jacket or umbrella – rain on about 10 days
Heating and cooling
March has 295 heating degree days and 2 cooling degree days (base 65°F), 10% of the year's total heating and cooling demand.
Questions
How cold is Napa in March?
The normal high is 68°F and the normal low is 44°F. From 1991 to 2020 the coldest March reading was 30°F (most recently on March 11, 2006).
Does it rain a lot in Napa in March?
About 10 days in March have at least 0.01 in of precipitation, and the normal total is 3.7 in. The wettest March in 1991-2020 was in 1995 (12.0 in); the driest was in 2015 (0.1 in).
Is March a good time to visit Napa?
March ranks 5th of 12 months on our comfort score for Napa (69 out of 100). It has about 18 comfortable days. 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.