July Weather in Guerneville, United States

Last updated: February 24, 2025

July in Guerneville, United States offers a delightful summer experience characterized by warm temperatures and sunny skies. The month sees maximum temperatures soaring to 35°C (95°F), with a comfortable average of 20°C (68°F) and a refreshing minimum of 11°C (53°F). Residents and visitors alike can enjoy an uninterrupted sunshine, as the area experiences 0 mm of precipitation over the month, ensuring ideal conditions for outdoor activities. With a humidity level of 70%, the climate feels pleasantly warm, making July an excellent time to explore the beauty of Guerneville's natural landscapes.

July Temperature in Guerneville

July in Guerneville, United States, marks the peak of summer, where temperatures embrace a delightful warmth. The month showcases a minimum temperature of 11°C (53°F), providing a comfortable start to each day, while the average hovers at a pleasant 20°C (68°F). As the sun climbs higher, the maximum temperatures soar to about 35°C (95°F), inviting locals and tourists alike to bask in the heat. Compared to the preceding months, July stands out with a significant rise in both daytime warmth and nighttime comfort, indicating a clear trend toward established summer weather. This blend of mild mornings and hot afternoons makes July in Guerneville an ideal time for outdoor adventures and leisurely escapes.

July Weather in Guerneville: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Guerneville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec495052566066686867625349
Data source: Temperature data for Guerneville 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.

July Precipitation in Guerneville

In Guerneville, July marks a notable shift in precipitation patterns, as the month reports absolutely no rainfall, a stark contrast to the wetter winter and early spring. Following a steady decline from January's 140 mm to June's 2 mm, July signals the onset of a dry spell that continues into August, with both months recording 0 mm of precipitation. This trend highlights a significant reduction in rainy days, from January's 9 rainy days to a complete halt in July. Such dryness not only reflects seasonal changes but also sets the stage for late summer conditions, characterizing Guerneville's distinct climate cycle. As the region basks in the sunshine, the lack of rain emphasizes the area's transition towards a warmer, drier late summer, juxtaposed with its earlier, wetter months.

July Precipitation Trends in Guerneville

The chart displays monthly precipitation patterns in Guerneville, with values for each month alongside July's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec14015796473020024361102
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Guerneville

In July, Guerneville experiences a notable shift in humidity, which drops to 70%, marking the lowest level of the year. This decline follows a steady decrease from January's 86%, showcasing a clear trend towards drier conditions as summer unfolds. With August further lowering humidity to 66%, it’s evident that Guerneville enjoys a brief respite from the high humidity levels that characterize the earlier months. Overall, the gradual reduction in moisture from the spring into summer not only enhances the comfort of outdoor activities but also highlights the region's seasonal variability in climate.

July Average Humidity in Guerneville

This chart illustrates the average monthly humidity levels in Guerneville, with July's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how July's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%80%80%76%70%66%68%72%84%84%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Guerneville

In Guerneville, July continues the trend of high UV exposure, maintaining an extreme UV Index of 11, just like the previous month. This level indicates that sunburn can occur within just 10 minutes of direct sunlight, emphasizing the importance of protective measures during outdoor activities. The preceding months show a gradual increase in UV levels, rising from a moderate 3 in January to the extreme readings of summer, reinforcing the need for vigilance as temperatures soar. As we move towards August, the UV Index is expected to slightly decrease, yet it still remains at a very high level of 10. Always stay informed and protect your skin by checking the latest data on the Guerneville UV Index.

Maximum UV Index Levels in Guerneville for July

The chart shows the monthly maximum UV Index (UVI) for Guerneville in July, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3578101111109643
Data source: Guerneville July 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.

July Sunshine in Guerneville

July in Guerneville shines with a remarkable 375 hours of sunshine, making it one of the sunniest months of the year. This peak follows a steady increase from the year's start, as the days lengthen and summer blossoms into life. After June's 374 hours, July maintains this glorious warmth, hinting at the zenith of summer's radiant embrace. Following July, the sun begins to wane slightly in August and beyond, with hours gradually tapering off into the fall months. This trend showcases Guerneville's delightful transition from the vibrant energy of summer to the serene charm of autumn, inviting both locals and visitors to relish the sunshine while it lasts.

Monthly Sunshine Duration in Guerneville: July Highlighted

The July sunshine duration represents the total number of hours Guerneville experiences direct sunlight during the month of July, excluding cloudy or obstructed periods. This chart compares the sunshine duration of July with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec141h211h265h295h351h374h375h333h306h275h216h184h
Data source: Guerneville July Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Guerneville During July

July in Guerneville, United States, boasts a 79% chance of sunny weather, making it one of the sunniest months of the year. This follows a trend of increasing sunshine throughout the spring, peaking in May at 84% before settling slightly for the summer. While June also enjoys a solid 78% chance of sun, July and August, at 80%, truly embody the essence of summer with vibrant, sun-drenched days. As the year progresses into the cooler months, the likelihood of sunshine decreases significantly, with the percentage dipping to 52% in October and declining further to 36% in December. This sunny streak in July exemplifies Guerneville’s delightful summer climate, making it an ideal time for outdoor activities and enjoying nature.

Percentage of Sunny Days in July in Guerneville

The chart illustrates the percentage of sunny days in Guerneville throughout the year, with July 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 Guerneville experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%58%64%71%84%78%79%80%72%52%48%36%
Data source: Guerneville July chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Guerneville in July

In Guerneville, United States, July marks a peak in daylight duration, maintaining a generous 14 hours of sunlight, consistent with the preceding month of June. This trend of extended daylight reaches its zenith during the summer, showcasing nature's vibrant energy as days gradually lengthen from the cold depths of winter. With each month transitioning from January’s 9 hours to July’s bright 14 hours, the sun not only nourishes the landscape but also beckons residents and visitors alike to embrace outdoor adventures under the warm, golden rays. As August rolls in, this daylight gradually diminishes, reminding us of the fleeting summer days and the approaches of the cozier, shorter days of fall.

Average Daylight Hours in Guerneville for July

The chart illustrates the variation in daylight duration in Guerneville throughout the year, with July highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 48m10h 46m11h 59m13h 13m14h 16m14h 47m14h 30m13h 34m12h 22m11h 8m10h 3m9h 30m
Data source: Guerneville daylight hours, calculated by summing the hours between sunrise and sunset for each day.

July Winds in Guerneville

In July, the winds in Guerneville, United States, calm down to a gentle average speed of 2.4 m/s (5 mph), mirroring the breezy conditions of August. This mid-summer lull follows a gradual increase in wind speeds from earlier months, peaking at 4.1 m/s (9 mph) in May. As the year progresses, wind speeds tend to drop, with a notable decrease observed in the latter half of the year. This creates a serene atmosphere, perfect for enjoying the picturesque landscapes of Guerneville, where the soft winds complement the vibrant summer days.

Average July Wind Speed in Guerneville

The chart displays monthly wind speed patterns in Guerneville, with values for each month shown alongside July's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how July's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.43.02.93.24.13.42.4 m/s2.42.32.71.82.5
Data source: Guerneville July wind data, generated using information from the Copernicus Climate Change Service.

How July Weather in Guerneville Compares to Other Months

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

In July, the weather is warm and dry, with temperatures ranging from a pleasant 11°C (53°F) at night to a hot 35°C (95°F) during the day, accompanied by 0 mm of precipitation and 70% humidity. In stark contrast, January experiences much cooler temperatures, with a minimum of -1°C (30°F), an average of 10°C (50°F), and a maximum of 25°C (77°F). January also sees significant rainfall, accumulating to 140 mm (5.5 in) over approximately 9 days, and higher humidity levels at 86%. For more details on January weather, you can check Guerneville weather in January.

When comparing the weather in July and February, a stark contrast emerges. July boasts a warm range of temperatures, with a minimum of 11°C (53°F) and a maximum reaching 35°C (95°F), while enjoying beautiful sunshine and no recorded precipitation. In contrast, February experiences much cooler temperatures, where the minimum dips to -3°C (27°F) and the maximum reaches 25°C (77°F). Additionally, February is marked by significant rainfall, totaling 157 mm (6.2 in) over eight days, resulting in higher humidity levels at 84%. The differences in temperature and precipitation highlight the distinct character of each month. For more detailed information, you can check the Guerneville weather in February.

In comparing the weather between July and March, it is clear that July experiences significantly warmer temperatures, with minimums of 11°C (53°F), averaging 20°C (68°F), and peaking at a sweltering 35°C (95°F). This month also boasts dry conditions, recording no precipitation and a humidity level of 70%. In contrast, March presents a cooler climate, with minimum temperatures around 0°C (32°F) and an average of 11°C (52°F), reaching a maximum of 26°C (80°F). Additionally, March is characterized by much higher precipitation, totaling 96 mm (3.8 in) spread over approximately 10 days, along with a slightly higher humidity level of 83%. For more detailed insights, you can check out Guerneville weather in March.

In comparing the weather between July and April, it's evident that July experiences significantly warmer temperatures, with an average of 20°C (68°F) and a maximum reaching up to 35°C (95°F). In contrast, April's average temperature is cooler at 13°C (57°F), peaking at a maximum of 30°C (86°F). Additionally, July boasts a dry climate with no recorded precipitation, while April sees an average of 47 mm (1.9 in) of rain over six days, contributing to a slightly higher humidity level of 80% compared to July's 70%. For more detailed insights into April weather conditions, check out Guerneville weather in April.

July and May present contrasting weather patterns. In July, temperatures are typically warmer, with minimums around 11°C (53°F) and averages peaking at 20°C (68°F), while reaching maximums of 35°C (95°F). Notably, July boasts 0 mm of precipitation, meaning dry conditions prevail throughout the month, with no rainy days, and humidity sits at a moderate 70%. In contrast, May experiences cooler temperatures, with a minimum of 5°C (41°F) and an average of 16°C (60°F), while the maximum can reach 33°C (91°F). This month is characterized by more humidity at 80% and a total precipitation of 30 mm (1.2 in) over three rainy days. For more detailed information, you can check Guerneville weather in May.

In comparing the weather of July and June, July tends to be slightly warmer with an average temperature of 20°C (68°F) compared to June's 19°C (67°F). Both months experienced no significant rainfall, with July recording 0 mm (0.0 in) of precipitation and June having just 2 mm (0.1 in). Although June had a higher maximum temperature of 37°C (99°F) compared to July's 35°C (95°F), July boasts lower humidity at 70%, while June’s humidity is higher at 76%. For more detailed insights, check out the Guerneville weather in June.

In comparing the weather between July and August, both months exhibit similar temperature ranges, with July experiencing a minimum of 11°C (53°F) and a maximum of 35°C (95°F), while August's temperatures slightly dip with a minimum of 10°C (50°F) and a maximum of 35°C (96°F). The average temperature remains consistent at 20°C (68°F) for both months. Notably, both July and August boast completely dry conditions with no precipitation recorded, contributing to the overall low humidity levels—70% in July and slightly lower at 66% in August. For a detailed look at August weather patterns, you can visit Guerneville weather in August.

In comparing the weather of July and September, July typically boasts warmer temperatures, with a minimum of 11°C (53°F) and an average of 20°C (68°F), reaching a high of 35°C (95°F). In contrast, September sees slightly cooler temperatures, with a minimum of 8°C (47°F) and an average of 19°C (67°F), although it can spike to an impressive maximum of 40°C (103°F). Both months are characterized by low precipitation, with July recording 0 mm and September only slightly higher at 2 mm. Humidity levels remain relatively consistent, with July at 70% and September slightly lower at 68%. For more detailed insights, you can check Guerneville weather in September.

In July, the weather is typically warm and dry, with temperatures ranging from a minimum of 11°C (53°F) to a maximum of 35°C (95°F) and an average temperature of 20°C (68°F). This month sees no recorded precipitation and maintains a humidity level of 70%. In contrast, October experiences cooler temperatures, with a minimum of 3°C (38°F), an average of 16°C (62°F), and a maximum of 35°C (94°F). While still warm during the day, October is notably wetter, with 43 mm (1.7 in) of precipitation spread across 2 days, and a slight increase in humidity to 72%. For more details on October weather, visit Guerneville weather in October.

In July, the weather is typically warm, with average temperatures around 20°C (68°F) and highs soaring to 35°C (95°F). This month enjoys a dry climate, experiencing no precipitation and maintaining a comfortable humidity level of 70%. In contrast, November brings a notable shift, with minimum temperatures dropping to -1°C (30°F) and an average temperature of 12°C (54°F). This month also sees increased precipitation, measuring 61 mm (2.4 in) over about five days, and higher humidity at 84%. For more detailed weather insights, you can check Guerneville weather in November.

July and December present stark contrasts in weather. In July, temperatures range from a minimum of 11°C (53°F) to a maximum of 35°C (95°F), with an average of 20°C (68°F), and the month is characterized by dry conditions with no recorded precipitation. The humidity sits at 70%, providing a warm, albeit occasionally muggy, summer feel. In comparison, December chills the air with temperatures dropping to a minimum of 0°C (32°F) and reaching a maximum of 24°C (75°F), averaging around 9°C (49°F). This month experiences a significant 102 mm (4.0 in) of precipitation over 9 days, contributing to a higher humidity level of 84%. For a deeper look into December weather patterns, visit Guerneville weather in December.

Compare Guerneville's Climate with Cities Worldwide

Conclusion: What to Expect From July Weather in Guerneville

July in Guerneville is a sun-soaked delight, standing out from the cooler and wetter months of the year. With maximum temperatures soaring to 35°C (95°F) and an average of 20°C (68°F), the warmth invites outdoor adventures and relaxation by the river. This month is characterized by a remarkable absence of precipitation, leaving the landscape dry and vibrant, contrasting sharply with the wetter fall and winter months. Combined with a comfortable 70% humidity, July is a perfect time to enjoy Guerneville's enchanting scenery without the interruptions of rain. For a deeper look into how Guerneville's weather changes throughout the year, check out Guerneville Climate.