Napa climate

Napa Weather in March

NOAA 1991-2020 normals for Napa State Hospital, 2.8 km from Napa

Average highs run from 66°F on March 1 to 70°F on March 31, and lows from 43°F to 44°F. Normal precipitation for the month is 3.67 in over about 10 wet days.

March day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Napa, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

March at a glance

Average high
68°F
Average low
44°F
Precipitation
3.67 in
Record high
87°FMar 20, 2026
Record low
27°FMar 10, 2009
Chance of a freeze
21%
Daylight
11 h 22 min to 12 h 37 min
Cloud cover
54%
Humidity
81%
Dew point
44°F
Wind
6.5 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation.

DateNormal highNormal lowRecord highRecord lowChance wet
Mar 166°F43°F71°F 201332°F 200135%
Mar 266°F43°F73°F 202030°F 200735%
Mar 366°F43°F76°F 202032°F 201235%
Mar 466°F43°F78°F 202029°F 201834%
Mar 566°F43°F72°F 200828°F 201834%
Mar 666°F43°F73°F 202629°F 202234%
Mar 766°F43°F77°F 202630°F 200333%
Mar 867°F43°F80°F 200428°F 200233%
Mar 967°F43°F79°F 200430°F 201033%
Mar 1067°F43°F85°F 200427°F 200933%
Mar 1167°F43°F82°F 200531°F 200632%
Mar 1267°F43°F79°F 200731°F 202132%
Mar 1367°F44°F80°F 201731°F 200632%
Mar 1467°F44°F80°F 201730°F 200232%
Mar 1567°F44°F85°F 200430°F 200231%
Mar 1667°F44°F85°F 200429°F 202131%
Mar 1768°F44°F85°F 202633°F 200231%
Mar 1868°F44°F86°F 202631°F 201830%
Mar 1968°F44°F84°F 202632°F 200230%
Mar 2068°F44°F87°F 202632°F 202130%
Mar 2168°F44°F78°F 202631°F 200830%
Mar 2268°F44°F87°F 202231°F 200830%
Mar 2368°F44°F77°F 202629°F 200929%
Mar 2469°F44°F80°F 202532°F 200929%
Mar 2569°F44°F84°F 202532°F 201829%
Mar 2669°F44°F80°F 201532°F 202029%
Mar 2769°F44°F80°F 200930°F 202028%
Mar 2869°F44°F78°F 201732°F 199928%
Mar 2969°F44°F84°F 202630°F 200728%
Mar 3069°F44°F82°F 201132°F 200527%
Mar 3170°F44°F82°F 202128°F 200827%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Napa, in percent.0102030401102030
  • Chance of a wet day

Sunrise and sunset

Times for 2026, local time (PDT).

March 1
sunrise 6:41 AM, sunset 6:03 PM
March 31
sunrise 6:55 AM, sunset 7:32 PM

Every day of March: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046074 (Napa State Hospital), public domain. Records: NOAA GHCN-Daily, station USW00093227, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.