June Weather in Napa, United States

Last updated: February 24, 2025

Experience the delightful June weather in Napa, United States, where the sun-drenched days create the perfect atmosphere for outdoor activities and wine tastings. With maximum temperatures soaring to 41°C (106°F), the warmth envelops the region, while an average temperature of 21°C (70°F) provides a comfortable balance. The nights cool down to a refreshing 10°C (51°F), making evenings truly enjoyable. Remarkably, this month sees no precipitation, showcasing a dry spell with only 2 mm (0.1 in) of rain recorded, and humidity levels hovering around 64%. Embrace the beauty of Napa in June, where the sky is clear, and the vineyard landscapes are vibrant!

June Temperature in Napa

In June, Napa experiences a delightful rise in temperatures that signals the onset of summer. With minimums averaging 10°C (51°F) and maximums soaring to a sweltering 41°C (106°F), it's no wonder this month draws visitors seeking warm, sunlit days. The average temperature hovers around 21°C (70°F), creating a perfect climate for outdoor activities and vineyard tours. As the month progresses, Napa showcases a notable increase in warmth compared to earlier months, like May, where temperatures peaked at 37°C (99°F). This upward trend continues into July and August, making June a sweet spot in the region for enjoying both warm breezes and vibrant landscapes.

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

The chart illustrates June 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.
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The average of daily temperatures (24 hours) calculated across all days in the month.

June Precipitation in Napa

In Napa, June marks a notable transition in precipitation patterns, with rainfall plummeting to a mere 2 mm (0.1 in), contrasting sharply with the earlier months. The first half of the year displays a significant decline as January through May experience substantial rainfall, peaking in January at 119 mm over 8 days. However, by the time June rolls around, the region enjoys a dry spell, as indicated by zero rainfall days. This stark reduction foreshadows the hot summer months ahead, where July and August see no precipitation at all. As Napa moves into the summer season, the dramatically low June rainfall signals a shift towards a typically dry climate, emphasizing its Mediterranean weather pattern.

June Precipitation Trends in Napa

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

June in Napa marks a notable dip in humidity, with levels dropping to 64% compared to 74% in May. This shift reflects the transition into the summer months, where the humidity continues to decline, hitting a low of 44% in July and 36% in August. The trend showcases a move towards drier conditions as the year progresses, creating a comfortable atmosphere ideal for outdoor activities and wine tasting. While January and February maintain a consistently high humidity of 84%, June stands out as the beginning of a more arid season, setting the stage for Napa's warm, inviting summer days.

June Average Humidity in Napa

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

June UV Index in Napa

In Napa, United States, June marks a significant rise in UV exposure with an index soaring to 11, classified as extreme. This shift from the earlier months highlights a trend of intensifying sunlight as summer approaches. Just a month prior, the UV Index reached 10 in May, also within the extreme category, but as days grow longer and temperatures rise, effective burn time decreases to only 10 minutes. Comparatively, earlier months like January and February only saw moderate UV levels of 3 and 5, which allowed for safer sun exposure of 30 minutes. As you plan your summer activities, be mindful of the dramatic increase in UV intensity during June, and make sure to take necessary precautions to protect your skin. For more on UV levels and how to stay safe, visit Napa UV Index.

Maximum UV Index Levels in Napa for June

The chart shows the monthly maximum UV Index (UVI) for Napa in June, 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 June 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.

June Sunshine in Napa

As June rolls into Napa, the sun shines brightly with an impressive 384 hours of sunshine, marking the peak of a delightful trend that begins in the earlier months. Starting with 141 hours in January, the days gradually lengthen, bringing increased warmth and brightness. From 257 hours in March to 357 hours in May, each month builds anticipation for the long, sun-soaked days of summer. Following June, July sees a slight uptick to 394 hours, but the overall pattern reveals that summer truly shines in this picturesque region. With the sun illuminating the vineyards and rolling hills, June embodies the essence of Napa’s lush beauty, inviting both locals and visitors to indulge in its vibrant landscape.

Monthly Sunshine Duration in Napa: June Highlighted

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

Chance of Sun in Napa During June

In Napa, the likelihood of basking in sunny weather reaches a remarkable peak in June, with an 82% chance of clear skies, mirroring the blossoming sunshine of May. This upward trend in sunny days begins in the earlier months of the year, where January starts bleak at just 38%, gradually ascending as spring unfolds. By April, the chances improve to 70%, paving the way for a radiant May. As summer approaches, June solidifies this pattern, offering ample sunshine before slightly tapering off in July and August. Whether you're planning a vineyard tour or an outdoor picnic, June promises delightful weather, perfect for savoring Napa's stunning landscapes under the sun.

Percentage of Sunny Days in June in Napa

The chart illustrates the percentage of sunny days in Napa throughout the year, with June 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 June chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Napa in June

In Napa, United States, June marks a delightful peak in daylight duration, basking in 14 hours of sunlight. This is consistent with the longer days that begin in spring, where May already boasts 14 hours of daylight, establishing a trend that continues through the summer months of July and August. As the year progresses, the amount of sunlight begins to taper off, with September seeing a slight decline to 12 hours. This rhythmic ebb and flow of daylight—starting from a modest 9 hours in January to the luminous high of June—illustrates the enchanting seasonal transitions in Napa, putting the region in its sun-kissed glory during the mid-year months.

Average Daylight Hours in Napa for June

The chart illustrates the variation in daylight duration in Napa throughout the year, with June 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.

June Winds in Napa

As June sweeps into Napa, the gentle rise in average wind speed signals the transition into summer. With winds reaching 3.3 m/s (7 mph), June outpaces the milder months of early spring, reflecting an invigorating change in the atmosphere. This uptick is consistent with the gradual increase noted from May's 3.1 m/s, indicating a seasonal pattern where warmer months tend to experience slightly breezier conditions. Following June, the winds ease into July at 3.0 m/s, suggesting a continuation of this refreshing summer breeze before tapering off as the season progresses. The overall trend showcases Napa's dynamic climate, where every month shapes a unique character marked by its breeze.

Average June Wind Speed in Napa

The chart displays monthly wind speed patterns in Napa, with values for each month shown alongside June's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how June's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.02.42.52.73.13.3 m/s3.02.72.42.31.62.0
Data source: Napa June wind data, generated using information from the Copernicus Climate Change Service.

How June 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 June'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.

June and January present stark contrasts in weather, showcasing the drastic seasonal shifts. In June, temperatures in Napa soar with a minimum of 10°C (51°F) and an average of 21°C (70°F), reaching as high as 41°C (106°F). The month is typically dry, with little to no precipitation and a moderate humidity level of 64%. In contrast, January experiences much cooler temperatures, with a minimum of -2°C (29°F) and an average of 10°C (50°F), capping at 25°C (77°F). This month is also characterized by significant rainfall, receiving 119 mm (4.7 in) over about 8 days, along with a higher humidity level of 84%. For more detailed information, you can check Napa weather in January.

When comparing the weather in June and February, it’s clear that these months present contrasting climates. June typically boasts warmer temperatures, with a minimum of 10°C (51°F) and an average high of 41°C (106°F), while February experiences much cooler conditions, ranging from a minimum of -1°C (30°F) to a maximum of 27°C (80°F). Additionally, June is characterized by very low precipitation, averaging just 2 mm (0.1 in) with no rainy days, whereas February sees significantly more rainfall, totaling 113 mm (4.5 in) across seven days. Humidity levels also differ, with June at 64% compared to February’s higher 84%. For more details on the February weather, you can check out Napa weather in February.

June and March present contrasting weather profiles. June boasts a warm average temperature of 21°C (70°F), with maximum highs reaching up to 41°C (106°F) and minimal precipitation, resulting in dry conditions. In stark contrast, March features cooler temperatures, averaging 12°C (55°F), with highs peaking at 30°C (87°F) and significantly higher rainfall of 81 mm (3.2 in) over nine days, leading to an 83% humidity level. For more detailed information, you can refer to Napa weather in March.

When comparing the weather in June and April, June typically showcases warmer temperatures, with a minimum of 10°C (51°F) and an average of 21°C (70°F), reaching highs of up to 41°C (106°F). In stark contrast, April experiences cooler conditions, with a minimum temperature of 3°C (38°F) and an average of 15°C (60°F), peaking at 33°C (92°F). Additionally, June boasts very little precipitation, averaging just 2 mm (0.1 in) over the month with no rainy days, while April is much wetter, recording 33 mm (1.3 in) of rain across five days. The humidity levels also differ, with June having a lower average of 64% compared to April's 81%. For more detailed insights, you can explore Napa weather in April.

June generally sees warmer weather compared to May, with average temperatures rising from 18°C (64°F) in May to 21°C (70°F) in June. The maximum temperature can reach up to a scorching 41°C (106°F) in June, compared to May's maximum of 37°C (99°F). Additionally, June experiences significantly less precipitation, with only 2 mm (0.1 in) recorded on no days of rain, whereas May receives 19 mm (0.8 in) over two rainy days. Humidity levels also decrease slightly in June to 64%, down from 74% in May. For more details, check out Napa weather in May.

June and July exhibit similar average temperatures, with June showing a minimum of 10°C (51°F) and a maximum of 41°C (106°F), compared to July's minimum of 11°C (53°F) and a maximum of 40°C (104°F). Both months experience almost no precipitation, with June recording just 2 mm (0.1 in) and July seeing none at all. However, there's a noticeable difference in humidity, where June has a higher level of 64%, while July enjoys a drier atmosphere with only 44% humidity. For more details on the weather trends during July, you can check out Napa weather in July.

In June, the weather is characterized by mild temperatures, with a minimum of 10°C (51°F) and an average of 21°C (70°F), while the maximum can soar to a hot 41°C (106°F). With minimal precipitation of just 2 mm (0.1 in) over the month, humidity remains relatively high at 64%. In contrast, August experiences slightly warmer minimum temperatures at 12°C (53°F) and an average temperature similar to June, at 21°C (71°F). However, the maximum temperature in August reaches a hotter 42°C (108°F), and it enjoys completely dry conditions with no precipitation and lower humidity at 36%. For more detailed information about August weather, you can visit Napa weather in August.

In June, temperatures range from a cool 10°C (51°F) at night to a scorching high of 41°C (106°F) during the day, with an average temperature of 21°C (70°F). The month is characterized by minimal precipitation, recording just 2 mm (0.1 in) and experiencing no rainy days, along with a moderate humidity level of 64%.

In contrast, September features slightly cooler nighttime temperatures at a low of 8°C (46°F), but the daytime highs can reach up to 44°C (111°F), maintaining an average of 21°C (70°F). Similar to June, precipitation is scarce, with only 1 mm (0.0 in) recorded and no rainfall days, though the humidity drops notably to 44%. For more details on September’s weather, you can visit Napa weather in September.

In June, the weather tends to be much warmer, with temperatures ranging from a mild 10°C (51°F) at night to a scorching maximum of 41°C (106°F) during the day. Additionally, precipitation is virtually nonexistent, making it one of the driest months with only 2 mm (0.1 in) of rain. In contrast, October brings cooler temperatures, with minimums dropping to 4°C (40°F) and maximums reaching 36°C (98°F), along with increased rainfall at 29 mm (1.1 in) spread over two days. Humidity remains consistent, slightly rising from June at 64% to 65% in October. For a more detailed look at October weather, check out Napa weather in October.

June and November present striking contrasts in weather patterns. In June, the temperatures range from a minimum of 10°C (51°F) to a scorching maximum of 41°C (106°F), with an average temperature of 21°C (70°F). This month enjoys very little precipitation, averaging only 2 mm (0.1 in) and typically features no rainy days, all while maintaining a moderate humidity level of 64%. In contrast, November brings cooler conditions, with temperatures ranging from a chilly 0°C (32°F) to a mild maximum of 30°C (86°F) and an average of 13°C (56°F). Precipitation rises significantly during this month, with around 43 mm (1.7 in) falling over approximately five days and humidity increasing to 84%. To explore more about November weather, you can visit Napa weather in November.

June and December present contrasting weather experiences. In June, temperatures range from a minimum of 10°C (51°F) to a maximum of 41°C (106°F), with an average of 21°C (70°F) and nearly no precipitation, making it a dry and warm month. In stark contrast, December sees temperatures drop significantly, with a minimum of 0°C (32°F) and a maximum of 24°C (75°F), averaging around 10°C (50°F). Additionally, December experiences considerable precipitation, totaling 91 mm (3.6 in) over 9 days, and higher humidity at 83%. For a more detailed look at December weather in Napa, you can check Napa weather in December.

Compare Napa's Climate with Cities Worldwide

Conclusion: What to Expect From June Weather in Napa

June in Napa stands out with its warm and inviting climate, typically basking in plentiful sunshine and significantly lower humidity compared to the earlier months of the year. With no recorded precipitation days, it marks a shift to drier conditions, allowing outdoor activities to thrive. This month enjoys higher daily temperatures, which can reach up to a scorching 41°C (106°F), providing a stark contrast to the cooler spring months. As you savor the sunny days, don’t forget to explore more about the overall climate patterns by visiting Napa Climate.