October Weather in Napa, United States

Last updated: February 24, 2025

In October, Napa, United States experiences a captivating blend of warm and cool temperatures, with maximums reaching 36°C (98°F) and averages around 18°C (65°F). Visitors can expect crisp mornings, as minimum temperatures dip to 4°C (40°F). The month sees a modest precipitation total of 29 mm (1.1 in) over just two days, making it an ideal time for outdoor activities amid a comfortable humidity level of 65%. Whether exploring vineyards or enjoying scenic landscapes, October in Napa offers a delightful mix of autumn charm and pleasant weather.

October Temperature in Napa

In Napa, United States, October ushers in a delightful shift in temperatures as summer fades into fall. The month typically starts with a minimum of 4°C (40°F) and sees an average of 18°C (65°F), gently transitioning towards cooler climates. Days remain pleasantly warm, peaking at a maximum of 36°C (98°F), reflecting the lingering heat from summer. Compared to the sweltering highs of September, October offers a welcome reprieve while still retaining enough warmth for outdoor activities and wine tastings. As the landscape transforms with autumn’s golden hues, visitors can enjoy ideal conditions that make Napa's vineyards especially inviting this time of year.

October Weather in Napa: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Napa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec505254596470707070655550
Data source: Temperature data for Napa generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Napa

In Napa, October marks a subtle transition as the region begins to shed its summer dryness, welcoming 29 mm (1.1 in) of precipitation over just 2 days. This uptick in rainfall is a significant rise compared to the preceding months, where June to September saw virtually no rain. October's modest showers hint at the impending winter, paving the way for a shift in the landscape. As the cooler weather sets in, the increased moisture enriches the vineyards and gardens, rejuvenating them after the parched summer. This gradual return of rain foreshadows the wetter months ahead, where November typically brings 43 mm (1.7 in) of rain, followed by a peak in December. Thus, October stands as a refreshing prelude to Napa’s wetter season, bridging the gap between hot, dry summers and the lush, vibrant winters that locals cherish.

October Precipitation Trends in Napa

The chart displays monthly precipitation patterns in Napa, with values for each month alongside October's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec1201138133192001294391
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

October Humidity in Napa

As October rolls around in Napa, United States, the humidity begins to pivot from the dry summer months, rising to a comfortable 65%. This marks a notable increase from the lows of 36% experienced in August and 44% in September, signaling a shift in weather patterns as the region transitions toward autumn. The relative humidity in October is a welcome change, more akin to the higher levels observed in the colder months, which typically see readings between 81% and 84%. This trend highlights Napa's evolution from the arid heat of summer to the moister conditions of fall, creating a refreshing atmosphere ideal for enjoying the beautiful vineyards and scenic landscapes that the region is known for.

October Average Humidity in Napa

This chart illustrates the average monthly humidity levels in Napa, with October's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how October's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%83%81%74%64%44%37%44%65%84%83%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Napa

As October rolls into Napa, the UV Index settles at a moderate level of 6, reflecting a shift from the intense summer months. This drop from September’s high of 9 signifies a seasonal easing of sun exposure risks, although care is still advised, with a burn time of 25 minutes for fair-skinned individuals. Following the month-to-month trend, we see a gradual decline from the extreme UV index peaks of 11 in June and July, transitioning to more manageable levels by fall. This pattern highlights the change in sun intensity as the year winds down, allowing for enjoyable outdoor activities while still remaining mindful of UV exposure. For more insights on sun safety and UV levels, check out Napa UV Index.

Maximum UV Index Levels in Napa for October

The chart shows the monthly maximum UV Index (UVI) for Napa in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Napa October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

October Sunshine in Napa

As October unfolds in Napa, the region basks in a delightful 280 hours of sunshine, a testament to the waning warmth of autumn. This month marks a gentle decline from the summer's peak, where July dazzled with an impressive 394 hours of sun, showcasing Napa's vibrant, sun-kissed landscapes. Following the energetic summer months, September retains a generous 314 hours, but October begins to hint at the cooler days ahead, while still providing ample daylight for grape harvesting and outdoor activities. The gradual transition into late fall is mirrored in the sunshine hours, with the promise of crisp mornings and golden afternoons, making October a lingering celebration of warmth before the seasonal shift takes hold.

Monthly Sunshine Duration in Napa: October Highlighted

The October sunshine duration represents the total number of hours Napa experiences direct sunlight during the month of October, excluding cloudy or obstructed periods. This chart compares the sunshine duration of October with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec141h210h257h296h357h384h394h356h314h280h220h185h
Data source: Napa October Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Napa During October

In Napa, United States, the likelihood of sunny weather in October reflects a notable shift as autumn sets in, with a 53% chance of sunshine. This marks a decline from the peak sun-filled months of May and June, which boast an impressive 82% chance. However, October still retains a higher probability of sunny days than the later fall months, such as November, which dips to 45%. The trend showcases that while the days are getting shorter and the air cooler, there’s still ample opportunity to enjoy the gentle warmth of an October sun against the backdrop of Napa's stunning vineyards.

Percentage of Sunny Days in October in Napa

The chart illustrates the percentage of sunny days in Napa throughout the year, with October highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Napa experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec38%58%63%70%82%82%73%79%76%53%45%31%
Data source: Napa October chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Napa in October

As October arrives in Napa, the days begin to shorten with approximately 11 hours of daylight, marking a gentle transition into the cooler months. This drop in daylight follows a gradual increase through spring and summer, where longer days peaked at 14 hours in June, July, and August. As the seasons shift, the daylight duration gradually wanes—starting from 12 hours in September to 10 hours in November—reflecting the rhythmic ebb and flow of daylight that characterizes Napa's climate. This rich variation not only signals changes in the weather but also invites a beautiful evolution in the region’s landscapes and activities as it prepares for the cozy embrace of winter.

Average Daylight Hours in Napa for October

The chart illustrates the variation in daylight duration in Napa throughout the year, with October highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 50m10h 46m11h 59m13h 13m14h 15m14h 46m14h 29m13h 33m12h 22m11h 8m10h 4m9h 32m
Data source: Napa daylight hours, calculated by summing the hours between sunrise and sunset for each day.

October Winds in Napa

As October breezes unfold in Napa, the wind settles into a gentle rhythm, averaging 2.3 m/s (5 mph). This slight decrease from the summer's peak winds, which reached 3.3 m/s in June, marks a transition into the softer whispers of autumn. By October, the air becomes a bit calmer, reminiscent of the peaceful landscapes that envelop the vineyards, where the vibrant hues of fall foliage mirror the cool, soothing winds. This pattern of gradually diminishing wind speeds from August's 2.7 m/s hint at the approaching winter months, where November sees a further drop to 1.6 m/s. Thus, October serves as a gentle reminder that change is in the air, both in nature and in the rhythm of Napa's enchanting seasons.

Average October Wind Speed in Napa

The chart displays monthly wind speed patterns in Napa, with values for each month shown alongside October's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how October's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.02.42.52.73.13.33.02.72.42.3 m/s1.62.0
Data source: Napa October wind data, generated using information from the Copernicus Climate Change Service.

How October Weather in Napa Compares to Other Months

The weather in Napa changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of October's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Napa and find detailed weather information for every month.

October weather typically features a much warmer temperature range, with minimums around 4°C (40°F) and maximums reaching up to 36°C (98°F), while January sees cooler conditions with lows dipping to -2°C (29°F) and highs peaking at 25°C (77°F). Additionally, October experiences relatively low precipitation of 29 mm (1.1 in) over just two days, whereas January is significantly wetter, with 119 mm (4.7 in) of rainfall spread across eight days. The humidity in October averages 65%, compared to a higher 84% in January, contributing to the overall feel of the seasons. For more details, you can check Napa weather in January.

October and February present distinct contrasts in weather patterns. In October, the temperatures range from a cool 4°C (40°F) to a warm 36°C (98°F), with an average of 18°C (65°F) and relatively low precipitation of 29 mm (1.1 in) over just 2 days. The humidity sits at a comfortable 65%. In contrast, February experiences cooler temperatures, with a minimum of -1°C (30°F) and a maximum of 27°C (80°F), averaging around 11°C (53°F). However, February sees significantly higher precipitation, totaling 113 mm (4.5 in) over 7 days and higher humidity at 84%. For a more detailed look at February weather, you can visit Napa weather in February.

October and March exhibit distinct differences in weather patterns. In October, temperatures range from a minimum of 4°C (40°F) to a maximum of 36°C (98°F), with a mild average of 18°C (65°F). This month typically experiences only 29 mm (1.1 in) of precipitation over just 2 days, resulting in relatively low humidity levels at 65%. In contrast, March features cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 30°C (87°F), averaging 12°C (55°F). This month is significantly wetter, boasting 81 mm (3.2 in) of precipitation spread over 9 days, alongside a higher humidity level of 83%. For more detailed insights into the weather in March, you can explore Napa weather in March.

When comparing the weather in October and April, October typically presents a warmer profile with average temperatures around 18°C (65°F) and a maximum that can reach up to 36°C (98°F). In contrast, April sees a slightly cooler average temperature of 15°C (60°F) with a maximum of 33°C (92°F). Precipitation is also more frequent in April, with 33 mm (1.3 in) over five days compared to October's 29 mm (1.1 in) over just two days. Additionally, April tends to be more humid, with a humidity level of 81% compared to October's 65%. For more detailed information about April weather, you can check Napa weather in April.

In October, temperatures range from a minimum of 4°C (40°F) to a maximum of 36°C (98°F), with an average temperature of 18°C (65°F). The month sees about 29 mm (1.1 in) of precipitation over just two days, while the humidity is around 65%. In contrast, May experiences slightly milder conditions, with temperatures varying from a minimum of 5°C (41°F) to a maximum of 37°C (99°F), maintaining a similar average of 18°C (64°F). Rainfall in May is lower at 19 mm (0.8 in) over the same two days, but humidity is higher at 74%. For more detailed information on May weather, visit Napa weather in May.

In contrast to June, October presents a wider temperature range, with minimums dipping to 4°C (40°F) and maximums reaching up to 36°C (98°F), while June maintains warmer temperatures with a minimum of 10°C (51°F) and a maximum of 41°C (106°F). Despite having a slightly lower average temperature, October brings more rainfall, with 29 mm of precipitation over just two days, compared to June's virtually dry conditions with only 2 mm of precipitation. Humidity levels are quite similar in both months, with October at 65% and June at 64%. For more detailed insights on June weather, you can check Napa weather in June.

The weather in October is quite variable, with temperatures ranging from a cool minimum of 4°C (40°F) to a warm maximum of 36°C (98°F), and an average of 18°C (65°F). This month also sees some precipitation, with about 29 mm (1.1 in) over two days and a humidity level of 65%. In contrast, July offers a much more stable and dry climate, with minimum temperatures starting at 11°C (53°F) and peaking at 40°C (104°F), averaging around 21°C (70°F). Notably, July experiences zero precipitation and enjoys a lower humidity of 44%. For a closer look at Napa's climate during this summer month, check out Napa weather in July.

When comparing the weather of October and August, there's a noticeable shift in temperature and humidity. October features a wider temperature range, with minimums dipping to 4°C (40°F) and maxima reaching 36°C (98°F), while average temperatures sit around 18°C (65°F). In contrast, August tends to be warmer overall, with minimum temperatures at 12°C (53°F) and maximums soaring up to 42°C (108°F), averaging around 21°C (71°F). Additionally, October experiences more humidity at 65% compared to August's drier conditions at 36%. Precipitation patterns also differ significantly; October sees an average of 29 mm (1.1 in) over two days, whereas August remains completely dry. For more detailed insights into August weather, you can check Napa weather in August.

In comparing the weather of October and September, October shows a noticeable dip in minimum temperatures, dropping to a low of 4°C (40°F) compared to September's minimum of 8°C (46°F). While the average temperature in September is slightly warmer at 21°C (70°F), October reaches a maximum of 36°C (98°F), but still falls short of September’s peak of 44°C (111°F). Rainfall increases in October, with 29 mm (1.1 in) over 2 days, contrasting sharply with September’s dry conditions, which recorded only 1 mm (0.0 in) of precipitation on no days. Additionally, October experiences higher humidity at 65%, compared to September's 44%, contributing to a richer autumn feel. For further details on September weather patterns, you can refer to Napa weather in September.

In October, the weather typically features a wide range of temperatures, with a minimum of 4°C (40°F) and an average high of 36°C (98°F), resulting in a warm overall climate. The month sees relatively low precipitation, with only 29 mm (1.1 in) falling over just 2 days, and humidity levels around 65%. In contrast, November brings cooler temperatures, with a minimum of 0°C (32°F) and an average high of 30°C (86°F). Precipitation increases to 43 mm (1.7 in) over 5 days, and humidity rises to 84%, contributing to a much more damp and chilly atmosphere. For more specifics about weather conditions in November, you can check Napa weather in November.

In comparing October and December weather, October generally offers warmer temperatures with an average of 18°C (65°F), reaching highs of 36°C (98°F) on occasion, while December tends to be cooler, with an average of 10°C (50°F) and maximum temperatures peaking at 24°C (75°F). Precipitation also varies significantly; October experiences just 29 mm (1.1 in) over only 2 days, whereas December sees a substantial increase, with 91 mm (3.6 in) spread over 9 days, contributing to higher humidity levels of 83% compared to October's 65%. For more detailed information, you can check Napa weather in December.

Compare Napa's Climate with Cities Worldwide

Conclusion: What to Expect From October Weather in Napa

October in Napa presents a delightful transition from the heat of summer to the cooler embrace of fall. While temperatures can still reach a pleasant warmth, the average dips to a comfortable level, offering a refreshing change from the sweltering highs of the preceding months. With just a couple of days of rain, the landscape flourishes, making it an ideal time to explore the vineyards and picturesque scenery. The moderate humidity enhances the crispness of the air, inviting visitors to indulge in outdoor adventures. For a more comprehensive look at how October weather compares throughout the year, check out Napa Climate.