AI-generatedNapa Valley at a glance
- Best time
- Apr – Oct
- Warmest month
- Aug · 28°
- Sunshine a year
- 3,010 h
- Rain a year
- 568 mm
- Climate
- Mediterranean
- Time zone
- UTC−8 / UTC−7
- Elevation
- 6 m
Climate in Napa Valley
Napa Valley has a Mediterranean climate with warm to hot, dry summers and mild, wetter winters. August is the warmest month with average highs of 28 °C, while December is the coolest at 14 °C. With around 3,010 hours of sunshine a year, Napa Valley is very sunny; July is the sunniest month with 12.0 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Excellent
Best time to visit: April – October
Good forSightseeing & walks
A typical day in October
- Morning, 08:00: about 14°
- Midday, 13:00: about 23°
- Afternoon, 16:00: about 24°
- Evening, 20:00: about 18°
- Night, 23:00: about 16°
07:1718:33
Pleasant evenings; a light layer can help.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:00–07:52 · evening 17:57–18:49
- Blue hour
- Morning 06:50–07:00 · evening 18:49–18:59
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Napa Valley in October?
In October, Napa Valley is warm: daytime highs average 24 °C, and nights cool down to about 12 °C. The sun shines for around 8 hours a day. Rain is rare: about 3 days bring 28 mm in total. All in all, October is an excellent month for a holiday in Napa Valley.
More details for October
- Daylight
- 11 h 16 min07:17 – 18:33
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 12 km/haverage daily peakAll months
- Cloud cover
- 33 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %77 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in October
- Sunscreen
- A jumper for the evenings
Sunshine hours in Napa Valley
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 7.6 of 11.3 hours of daylight in Napa Valley, 67 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Napa Valley
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 4 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 10).
Minutes until sunburn in October
- Very fair skin
- about 30 min
- Fair skin
- about 40 min
- Light brown skin
- about 55 min
- Olive skin
- about 70 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Napa Valley: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Napa Valley has about 3 rainy days with 28 mm of rain in total.
Wind and clouds in Napa Valley
How breezy and how cloudy Napa Valley is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Napa Valley typically peaks at 12 km/h during the day: Beaufort 3, light breeze.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 33 % of the sky over Napa Valley: mostly sunny, with about 7.6 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Napa Valley
How often the day gets hot in Napa Valley (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Napa Valley has about 3 hot days, with an average daytime high of 24 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Napa Valley
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
CoolOctober: nights around 12°. A duvet at night and a jumper for the evening.
The coolest nights are in January (5°), the warmest in August (14°). Nights fall below 8 °C on average from December to March, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 58 | 14° | 5° | 4.4 h | 9 | 109 |
| FebruaryFeb | 70 | 16° | 6° | 5.6 h | 9 | 115 |
| MarchMar | 84 | 17° | 7° | 6.8 h | 8 | 79 |
| AprilApr | 99 | 20° | 8° | 8.9 h | 5 | 35 |
| MayMay | 100 | 23° | 11° | 10.6 h | 3 | 19 |
| JuneJun | 100 | 27° | 13° | 11.9 h | 1 | 4 |
| JulyJul | 93 | 28° | 13° | 12.0 h | 0 | 1 |
| AugustAug | 91 | 28° | 14° | 11.1 h | 0 | 1 |
| SeptemberSep | 96 | 28° | 14° | 9.7 h | 1 | 3 |
| OctoberOct | 95 | 24° | 12° | 7.6 h | 3 | 28 |
| NovemberNov | 84 | 18° | 8° | 5.6 h | 6 | 60 |
| DecemberDec | 55 | 14° | 5° | 4.4 h | 10 | 114 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
38.30° N, 122.29° W · 6 m · America/Los_Angeles
Best time to visit Napa Valley
The best time to visit Napa Valley is from April to October. For sightseeing, day trips and hiking, conditions are most comfortable from February to July and from September to November. The wettest month is February with 115 mm of precipitation.
Napa Valley through the seasons
How the weather changes over the seasons, with averages for each.
Napa Valley in spring
Mar – May
Excellent
- 17–23 °C by day
- 9 h of sun a day
- 15 rainy days in all
Napa Valley in summer
Jun – Aug
Excellent
- 27–28 °C by day
- 12 h of sun a day
- 1 rainy days in all
Napa Valley in autumn
Sep – Nov
Excellent
- 18–28 °C by day
- 8 h of sun a day
- 10 rainy days in all
Napa Valley in winter
Dec – Feb
Good
- 14–16 °C by day
- 5 h of sun a day
- 27 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Napa Valley for you.
Your best months: May
Based on the climate averages; tap a month to see its details.
Compare two months in Napa Valley
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
May has the better holiday weather in Napa Valley: score 100 against 95. In May, days are 1 °C cooler than in October. The sun shines 3 hours longer a day in May.
| Month | October | May |
|---|---|---|
| Weather score | 95 | 100better |
| Day high | 24° | 23° |
| Night low | 12° | 11° |
| Sunshine | 7.6 h | 10.6 hbetter |
| Rainy days | 3 | 3 |
| Rainfall | 28 mm | 19 mm |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Feb – Jul, Sep – Nov
15–28 °C and not too much rain
Napa Valley month by month
The typical weather for every month at a glance.
58January14° · 4 h
In January, Napa Valley is cool: daytime highs average 14 °C, and nights cool down to about 5 °C. Expect around 4 hours of sunshine a day. Rain falls on about 9 days, adding up to 109 mm. All in all, January is a so-so month for a holiday in Napa Valley.
Napa Valley in January70February16° · 6 h
In February, Napa Valley is cool: daytime highs average 16 °C, and nights cool down to about 6 °C. Expect around 6 hours of sunshine a day. Rain falls on about 9 days, adding up to 115 mm. All in all, February is a good month for a holiday in Napa Valley.
Napa Valley in February84March17° · 7 h
In March, Napa Valley is mild: daytime highs average 17 °C, and nights cool down to about 7 °C. The sun shines for around 7 hours a day. Rain falls on about 8 days, adding up to 79 mm. All in all, March is an excellent month for a holiday in Napa Valley.
Napa Valley in March99April20° · 9 h
In April, Napa Valley is mild: daytime highs average 20 °C, and nights cool down to about 8 °C. The sun shines for around 9 hours a day. Rain is rare: about 5 days bring 35 mm in total. All in all, April is an excellent month for a holiday in Napa Valley.
Napa Valley in April100May23° · 11 h
In May, Napa Valley is warm: daytime highs average 23 °C, and nights cool down to about 11 °C. With around 11 hours of sunshine a day, there is plenty of sun. Rain is rare: about 3 days bring 19 mm in total. All in all, May is an excellent month for a holiday in Napa Valley.
Napa Valley in May100June27° · 12 h
In June, Napa Valley is warm: daytime highs average 27 °C, and nights cool down to about 13 °C. With around 12 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 7 days the thermometer climbs to 30 °C or more. All in all, June is an excellent month for a holiday in Napa Valley.
Napa Valley in June93July28° · 12 h
In July, Napa Valley is hot: daytime highs average 28 °C, and nights cool down to about 13 °C. With around 12 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 8 days the thermometer climbs to 30 °C or more. All in all, July is an excellent month for a holiday in Napa Valley.
Napa Valley in July91August28° · 11 h
In August, Napa Valley is hot: daytime highs average 28 °C, and nights cool down to about 14 °C. With around 11 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 9 days the thermometer climbs to 30 °C or more. All in all, August is an excellent month for a holiday in Napa Valley.
Napa Valley in August96September28° · 10 h
In September, Napa Valley is hot: daytime highs average 28 °C, and nights cool down to about 14 °C. With around 10 hours of sunshine a day, there is plenty of sun. It hardly ever rains. On about 9 days the thermometer climbs to 30 °C or more. All in all, September is an excellent month for a holiday in Napa Valley.
Napa Valley in September95October24° · 8 h
In October, Napa Valley is warm: daytime highs average 24 °C, and nights cool down to about 12 °C. The sun shines for around 8 hours a day. Rain is rare: about 3 days bring 28 mm in total. All in all, October is an excellent month for a holiday in Napa Valley.
Napa Valley in October84November18° · 6 h
In November, Napa Valley is mild: daytime highs average 18 °C, and nights cool down to about 8 °C. Expect around 6 hours of sunshine a day. Rain falls on about 6 days, adding up to 60 mm. All in all, November is an excellent month for a holiday in Napa Valley.
Napa Valley in November55December14° · 4 h
In December, Napa Valley is cool: daytime highs average 14 °C, and nights cool down to about 5 °C. Expect around 4 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 114 mm in total. All in all, December is a so-so month for a holiday in Napa Valley.
Napa Valley in DecemberNapa Valley compared
Put Napa Valley side by side with another destination.
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Napa Valley vs. Oakland
In October the holiday weather in Napa Valley and Oakland is about equally good (score 95 vs. 97). During the day Oakland is 3 °C cooler than Napa Valley.
| in October | Napa Valley | Oakland |
|---|---|---|
| Holiday score | 95 | 97 |
| Daytime high | 24° | 21° |
| Sea | – | 14° |
| Sunshine | 8 h | 8 h |
| Rainy days | 3 | 3 |
| Best time | Apr – Oct | Apr – Oct |
Through the year
USA in October: the best places
In October, Napa Valley ranks 9 among the 31 nearest destinations in this country.
- Las Vegas26°99
- 2Mariposa (Yosemite)23°98
- 3Los Angeles26°19°98
- 4Long Beach25°19°98
- 5Sedona23°97
- 6Sacramento25°96
- 7San Jose23°96
- 8Page (Lake Powell)21°96
- 9Napa ValleyThis page24°95
Planning a trip to Napa Valley
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Napa Valley in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Napa Valley has its best school-holiday weather during May half-term (score 100) and its weakest during the Christmas holidays (score 57).
- 95
Easter holidays
Mar – Apr
Excellent
- 19 °C by day
- 8.3 h of sun a day
- 6 rainy days a month
Good for: Sightseeing & walks
- 100
May half-term
May – Jun
ExcellentBest holidays
- 24 °C by day
- 10.9 h of sun a day
- 2 rainy days a month
Good for: Sightseeing & walks
- 92
Summer holidays
Jul – Aug
Excellent
- 28 °C by day
- 11.4 h of sun a day
- 0 rainy days a month
- 95
October half-term
Oct
Excellent
- 24 °C by day
- 7.6 h of sun a day
- 3 rainy days a month
Good for: Sightseeing & walks
- 57
Christmas holidays
Dec – Jan
Fair
- 14 °C by day
- 4.4 h of sun a day
- 9 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 10 h 50 min
- Distance
- 8,550 km
- Time zone
- UTC−7
- Jet lag
- About 5 days (8 h west)
Rule of thumb for flying west: for a few days before, stay up a little later, and get afternoon and evening light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Napa Valley
When is the best time to visit Napa Valley?
The best time to visit Napa Valley is from April to October. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Napa Valley?
August is the warmest month, with average highs of 28 °C and nights around 14 °C. December is the coolest month at 14 °C.
When does it rain most in Napa Valley?
The wettest month is February with 115 mm of precipitation. The driest month is July with 1 mm.
How many hours of sunshine does Napa Valley get?
Napa Valley gets around 3,010 hours of sunshine a year. The sunniest month is July with 12.0 hours a day; in January there are 4.4 hours a day.
What time zone is Napa Valley in?
Napa Valley uses the time zone America/Los_Angeles: UTC−8 in January and UTC−7 in July.
How long is the flight from London to Napa Valley?
A nonstop flight from London to Napa Valley takes about 10 h 50 min, for a straight-line distance of about 8,550 km.
Which school holidays are best for Napa Valley?
Napa Valley has its best school-holiday weather during May half-term (score 100) and its weakest during the Christmas holidays (score 57). Holiday ratings (0–100): Easter holidays 95, May half-term 100, Summer holidays 92, October half-term 95, Christmas holidays 57.
Near Napa Valley
Other destinations close by.
Places with a climate like Napa Valley
Destinations whose weather through the year is closest to Napa Valley's – good alternatives.