2024 Compare Climate & Weather:
St. Helena, CA vs Napa, CA
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Highlights
On average, there are 260 sunny days per year in Napa. St. Helena averages 263 sunny days per year. The US average is 205 sunny days.
Napa, California gets 27.3 inches of rain, on average, per year. St. Helena, California gets 37.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.
Napa averages 0 inches of snow per year. St. Helena averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.
Weather Highlights
Napa, California
Summer High: the July high is around 82.4 degrees
Winter Low: the January low is 37.7
Rain: averages 27.3 inches of rain a year
Snow: averages 0 inches of snow a year
St. Helena, California
Summer High: the July high is around 88.8 degrees
Winter Low: the January low is 37.6
Rain: averages 37.1 inches of rain a year
Snow: averages 0 inches of snow a year
BESTPLACES COMFORT INDEX
NapaThe annual BestPlaces Comfort Index for Napa is 8.4 (10=best), which means it is more comfortable than most places in California.
8.4 / 10
July, September and August are the most pleasant months in Napa, while January and December are the least comfortable months.
St. HelenaThe annual BestPlaces Comfort Index for St. Helena is 8.3 (10=best), which means it is more comfortable than most places in California.
8.3 / 10
June, May and October are the most pleasant months in St. Helena, while December and January are the least comfortable months.
Today's Weather - St. Helena, CA
12 AM PST
Sunny
90°F
| DAY | DESCRIPTION | HIGH / LOW | WIND |
|---|
| This Afternoon | Sunny | 100° / 66° | NW 5 to 8 mph |
| Wednesday | Sunny | 100° / 61° | WNW 1 to 6 mph |
| Thursday | Sunny | 96° / 55° | SSW 0 to 6 mph |
| Friday | Sunny | 90° / 54° | SW 0 to 7 mph |
| Saturday | Mostly Sunny | 91° / 56° | SW 0 to 6 mph |
| Sunday | Sunny | 91° / 55° | SW 1 to 6 mph |
| Monday | Sunny | 94° / 58° | SW 1 to 7 mph |
Today's Weather - Napa, CA
12 AM PST
Sunny
82°F
| DAY | DESCRIPTION | HIGH / LOW | WIND |
|---|
| Today | Sunny | 96° / 63° | WNW 6 to 10 mph |
| Wednesday | Sunny | 94° / 57° | SW 1 to 8 mph |
| Thursday | Sunny | 86° / 53° | SW 1 to 9 mph |
| Friday | Mostly Sunny | 80° / 53° | SW 2 to 10 mph |
| Saturday | Mostly Sunny | 84° / 55° | SW 2 to 9 mph |
| Sunday | Sunny | 82° / 54° | SW 2 to 10 mph |
| Monday | Sunny | 85° / 55° | SW 1 to 10 mph |
Average Monthly High / Low (°F)
| Month | St. Helena, CA | Napa, CA |
|---|
| January | 58° / 38° | 57° / 38° |
| February | 63° / 40° | 62° / 40° |
| March | 67° / 42° | 66° / 42° |
| April | 72° / 43° | 70° / 43° |
| May | 79° / 48° | 76° / 48° |
| June | 85° / 52° | 81° / 51° |
| July | 89° / 54° | 82° / 54° |
| August | 89° / 53° | 83° / 53° |
| September | 86° / 51° | 83° / 51° |
| October | 78° / 47° | 77° / 46° |
| November | 66° / 41° | 65° / 41° |
| December | 58° / 37° | 57° / 37° |
Hot, Freezing, Rainy, Snowy Days: St. Helena / Napa
| Month | Hot Days | Freezing Days | Rainy Days | Snowy Days |
|---|
| January | 0 / 0 | 7 / 7 | 12 / 11 | 0 / 0 |
| February | 0 / 0 | 3 / 3 | 11 / 11 | 0 / 0 |
| March | 0 / 0 | 1 / 1 | 10 / 10 | 0 / 0 |
| April | 1 / 0 | 1 / 0 | 6 / 7 | 0 / 0 |
| May | 3 / 2 | 0 / 0 | 4 / 4 | 0 / 0 |
| June | 8 / 5 | 0 / 0 | 1 / 1 | 0 / 0 |
| July | 13 / 5 | 0 / 0 | 0 / 0 | 0 / 0 |
| August | 13 / 6 | 0 / 0 | 0 / 0 | 0 / 0 |
| September | 10 / 6 | 0 / 0 | 2 / 1 | 0 / 0 |
| October | 3 / 1 | 0 / 0 | 4 / 4 | 0 / 0 |
| November | 0 / 0 | 2 / 2 | 9 / 8 | 0 / 0 |
| December | 0 / 0 | 9 / 8 | 12 / 12 | 0 / 0 |
July is the hottest month for St. Helena with an average high temperature of 88.8°, which ranks it as about average compared to other places in California. In St. Helena, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Helena are October, May and April.
August is the hottest month for Napa with an average high temperature of 83.0°, which ranks it as cooler than most places in California. In Napa, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Napa are October, May and June.
December has the coldest nighttime temperatures for St. Helena with an average of 37.1°. This is about average compared to other places in California.
December has the coldest nighttime temperatures for Napa with an average of 37.4°. This is about average compared to other places in California.
In St. Helena, there are 49.9 days annually when the high temperature is over 90°, which is about average compared to other places in California.
In Napa, there are 24.6 days annually when the high temperature is over 90°, which is cooler than most places in California.
In St. Helena, there are 22.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.
In Napa, there are 21.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.
In St. Helena, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.
In Napa, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.
February is the wettest month in St. Helena with 7.3 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 37.1 inches in St. Helena means that it is wetter than most places in California.
February is the wettest month in Napa with 5.4 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 27.3 inches in Napa means that it is wetter than most places in California.
January is the rainiest month in St. Helena with 11.9 days of rain, and July is the driest month with only 0.2 rainy days. There are 70.5 rainy days annually in St. Helena, which is rainier than most places in California. The rainiest season is Spring when it rains 49% of the time and the driest is Autumn with only a 2% chance of a rainy day.
December is the rainiest month in Napa with 12.0 days of rain, and July is the driest month with only 0.1 rainy days. There are 68.6 rainy days annually in Napa, which is rainier than most places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 2% chance of a rainy day.
There is rarely any recorded snowfall in St. Helena, ranking it as one of the least snowy places in California.
There is rarely any recorded snowfall in Napa, ranking it as one of the least snowy places in California.
Any measurable snowfall is a rare occurance in St. Helena.
Any measurable snowfall is a rare occurance in Napa.
DID YOU KNOW?
Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.
Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.
Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.
Reviews for St. Helena 
2 Reviews
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
Start Your Review of St. Helena
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
Start Your Review of Napa
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