Comparison of the Average Weather in Napa, Sonoma, Ukiah, and Santa Cruz Napa California, United States Sonoma California, United States Ukiah California, United States Santa Cruz California, United States Full Year Today Sep More Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Advertisement Average High and Low Temperature Average High and Low Temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 35°F 40°F 45°F 50°F 55°F 60°F 65°F 70°F 75°F 80°F 85°F 90°F 95°F Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The daily average high and low air temperature at 2 meters above the ground. Napa Average Hourly Temperature at Napa Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 12 AM 4 AM 8 AM 12 PM 4 PM 8 PM 12 AM Now Now very cold cold cold cool warm very cold comfortable very cold very cold Sonoma Average Hourly Temperature at Sonoma Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 12 AM 4 AM 8 AM 12 PM 4 PM 8 PM 12 AM Now Now very cold very cold cold cool cool warm comfortable very cold very cold Ukiah Average Hourly Temperature at Ukiah Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 12 AM 4 AM 8 AM 12 PM 4 PM 8 PM 12 AM Now Now very cold very cold cold cold cool hot warm very cold comfortable very cold comfortable Santa Cruz Average Hourly Temperature at Santa Cruz Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 12 AM 4 AM 8 AM 12 PM 4 PM 8 PM 12 AM Now Now cold cold cold cold cool comfortable frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight. Advertisement Chance of Clearer Skies Chance of Clearer Skies Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The percentage of time the sky is clear, mostly clear, or partly cloudy (i.e., less than 60% of the sky is covered by clouds). Daily Chance of Precipitation Daily Chance of Precipitation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The percentage of days in which precipitation is observed, excluding trace quantities. Advertisement Average Monthly Rainfall Average Monthly Rainfall Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1 in 2 in 3 in 4 in 5 in 6 in 7 in 8 in Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The average rainfall accumulated over the course of a sliding 31-day period centered on the day in question. Hours of Daylight Hours of Daylight Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 hr 4 hr 8 hr 12 hr 16 hr 20 hr 24 hr Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The number of hours during which the Sun is at least partly above the horizon. Chance of Muggy Conditions Chance of Muggy Conditions Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Now Now Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The percentage of time that is muggy, oppressive, or miserable (i.e., a dew point greater than 65°F). Average Wind Speed Average Wind Speed Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 mph 1 mph 2 mph 3 mph 4 mph 5 mph 6 mph 7 mph 8 mph 9 mph Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The average of mean hourly wind speeds at 10 meters above the ground. Tourism Score Tourism Score Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 2 4 6 8 10 Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The tourism score, which favors clear, rainless days with perceived temperatures between 65°F and 80°F. Beach/Pool Score Beach/Pool Score Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 2 4 6 8 10 Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The beach/pool score, which favors clear, rainless days with perceived temperatures between 75°F and 90°F. Growing Season Growing Season Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0% 20% 40% 60% 80% 100% Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The percentage chance that a given day is within the growing season, defined as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). Growing Degree Days Growing Degree Days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 500°F 1,000°F 1,500°F 2,000°F 2,500°F 3,000°F 3,500°F Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The average growing degree days accumulated over the course of the year, where growing degree days are defined as the integral of warmth above a base temperature (50°F in this case). Average Water Temperature Average Water Temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 51°F 52°F 53°F 54°F 55°F 56°F 57°F 58°F 59°F Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The daily average wide-area surface water temperature. Average Daily Incident Shortwave Solar Energy Average Daily Incident Shortwave Solar Energy Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 kWh 1 kWh 2 kWh 3 kWh 4 kWh 5 kWh 6 kWh 7 kWh 8 kWh 9 kWh Now Now Ukiah Ukiah Santa Cruz Santa Cruz Sonoma Sonoma Napa Napa The average daily shortwave solar energy reaching the ground per square meter. Data Sources This report illustrates the typical weather for Napa, Sonoma, Ukiah, and Santa Cruz, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. The details of the data sources used on this page vary between places and are discussed in detail on each place's dedicated page: Napa

Sonoma

Ukiah

Santa Cruz Disclaimer The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.