Last updated: February 24, 2025
In September, Nevada City experiences a striking blend of warm days and cool nights, with maximum temperatures soaring up to 41°C (106°F), while the average hovers around 21°C (70°F). As the month unfolds, the minimum temperature dips to a refreshing 5°C (41°F), providing a pleasant escape from the daytime heat. With only 2 days of precipitation totaling 23 mm (0.9 in) and a humidity level of 44%, the weather remains predominantly dry, creating ideal conditions for outdoor adventures amidst the stunning fall landscape.
In September, Nevada City experiences a delightful transition as summer gently slips into autumn. With minimum temperatures around 5°C (41°F) and maximums soaring to 41°C (106°F), it’s a month of contrasts that showcases the lingering warmth of summer while hinting at the cooler days ahead. The average temperature settles at a comfortable 21°C (70°F), making it an ideal time for outdoor activities amidst the stunning fall foliage. As the days shorten, the region's weather signifies a gradual cooling trend, preparing residents and visitors alike for the crispness of October. Enjoy the last vestiges of summer, as September emerges as a vibrant bridge between the two seasons.
In September, Nevada City experiences a modest uptick in precipitation, accumulating 23 mm (0.9 in) over approximately two days of rain. This marks a slight return to wetter weather following the exceptionally dry summer months, where July and August recorded virtually no rainfall. September's precipitation is a subtle hint of the seasonal transition, as the city prepares for the more substantial rains of October and November, which historically bring 78 mm (3.1 in) and 157 mm (6.2 in), respectively. This trend underscores the region's characteristic shift from a dry summer to a rainier fall, providing a necessary respite to the parched landscapes.
September in Nevada City marks a shift in humidity levels as summer transitions into fall. Following the dry months of July and August, where humidity plummets to a low of 36%, September sees a noticeable increase, rising to 44%. This resurgence reflects a gradual return to the higher humidity levels typical of earlier months, as the air begins to cool with the approach of autumn. The humidity in September remains lower than the winter months, where figures soar to 84% from November through January, but hints at the changing seasons and the promise of crisper, cooler days ahead. The fluctuation of humidity throughout the year reveals Nevada City's dynamic climate, highlighting the interplay between warmth and moisture as the year unfolds.
As September arrives in Nevada City, the sun's intensity remains significant, with a UV Index of 9 that falls into the very high exposure category. This marks a slight decrease from the extreme levels seen in the peak summer months of June and July, yet caution is still advised as the burn time is just 15 minutes. The transition from summer to fall brings a gradual reduction in UV intensity; however, September's UV Index is still higher than the earlier months of the year, suggesting that sun safety should continue to be a priority. Visitors and residents alike should remain vigilant, utilizing sun protection strategies even as the leaves start to change. For more on UV exposure in this beautiful region, visit Nevada City UV Index.
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September in Nevada City shines with 315 hours of sunshine, marking a delightful transition into autumn. This sunny month follows the peak of summer, where July dazzles with 397 hours, gradually giving way to a slight reduction in daylight as fall approaches. As August bids adieu with 362 hours, September maintains a robust level of sunlight, hinting at a vibrant seasonal shift. The overall trend reveals a steady build-up of sunshine from the chilly beginnings of the year, starting with a modest 141 hours in January, and peaking in the heat of summer. As the days grow shorter and the golden hues of fall begin to emerge, September offers a splendid balance of warmth and light before the cool months take over.
As summer transitions into autumn, September in Nevada City continues to bask in a substantial 84% likelihood of sunny weather. Following the peak sunshine of August, when bright skies are nearly guaranteed at 93%, September offers a slightly mellowed yet still favorable climate. This trend illustrates a remarkable increase from the 37% chance of sun in January, highlighting Nevada City's progression into the sun-drenched months. With a solid streak of sunshine leading up to October, this month serves as a delightful bridge, allowing residents and visitors to relish the warm days and crisp evenings before the cooler fall sets in.
As summer transitions to autumn in Nevada City, September offers a delightful shift in daylight, with 12 hours of sunshine illuminating the days. This marks a gradual decline from the longer days of July and August, which basked in 14 hours of sunlight. With the arrival of fall, daylight inches closer to the 11-hour mark seen in October, suggesting the impending cozy embrace of shorter days and longer nights. The progression through the year reveals a rhythmic ebb and flow of daylight—from a modest 9 hours in the depths of winter to the peak of 14 hours in the height of summer, embodying the dynamic beauty of the seasons in this charming locale.
As September rolls in, Nevada City experiences a slight uptick in average wind speed, with gentle breezes measuring 2.4 m/s (5 mph). This marks a subtle shift from the summer months, where winds tend to linger around 2.1 to 2.2 m/s (5 mph), creating a more tranquil atmosphere ideal for enjoying the stunning fall foliage. While the winds remain soft compared to other seasons, such as the invigorating 2.8 m/s (6 mph) gusts in December or the consistent 2.6 m/s (6 mph) throughout the early months of the year, the September breezes hint at the changing season, inviting residents and visitors alike to relish in nature’s transition as autumn approaches. Overall, these gentle winds in early fall create a perfect backdrop for outdoor activities, symbolizing a harmonious blend of warmth and the coolness of impending autumn.
The weather in Nevada City changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Nevada City and find detailed weather information for every month.
September and January in Nevada City showcase dramatically contrasting weather characteristics. September typically enjoys warm temperatures with an average of 21°C (70°F), peaking at a scorching 41°C (106°F), while January experiences much cooler conditions, with average temperatures around 7°C (45°F) and dropping as low as -5°C (24°F). Additionally, September is relatively dry, receiving only 23 mm (0.9 in) of precipitation over just 2 days, whereas January is marked by significantly higher rainfall, totaling 269 mm (10.6 in) across 12 days, leading to much higher humidity levels of 84% compared to September's 44%. For more detailed information, visit Nevada City weather in January.
September and February exhibit striking contrasts in weather patterns. September boasts an average temperature of 21°C (70°F), with daytime highs reaching up to 41°C (106°F) and a much drier climate, seeing only 23 mm (0.9 in) of precipitation over just two days. In stark contrast, February experiences significantly colder temperatures, with an average of 8°C (46°F) and minimums dipping to -7°C (19°F). Additionally, February is characterized by heavy rainfall, accumulating 279 mm (11.0 in) over ten days, alongside a higher humidity level of 84%. For more detailed insights on February's weather, you can check out Nevada City weather in February.
September and March showcase stark contrasts in weather. September typically enjoys warmer temperatures, with an average of 21°C (70°F) and maximums reaching up to 41°C (106°F). The month experiences minimal rainfall, averaging just 23 mm (0.9 in) over only 2 days, alongside low humidity at 44%. In contrast, March is marked by much cooler conditions, featuring a lower average temperature of 9°C (48°F) and minimums that can drop to -6°C (21°F). Precipitation is significantly higher during this month, averaging 267 mm (10.5 in) over 15 days, and humidity levels rise to 83%. For more detailed information, you can check Nevada City weather in March.
When comparing the weather in September and April, significant differences emerge in temperature and precipitation patterns. September boasts a wider temperature range, with minimums around 5°C (41°F) and soaring maximums reaching up to 41°C (106°F), accompanied by relatively low precipitation of just 23 mm (0.9 in) over two days. In contrast, April sees much cooler temperatures, dipping as low as -3°C (26°F) with an average of 13°C (55°F) and a maximum of 30°C (86°F). However, April is notably wetter, receiving 129 mm (5.1 in) of rain across nine days and exhibiting higher humidity levels at 81%. For a more detailed look at April weather in Nevada City, you can check Nevada City weather in April.
When comparing the weather in September and May, notable differences emerge. September typically features a wider temperature range, with minimums around 5°C (41°F), average highs at 21°C (70°F), and extreme peaks reaching up to 41°C (106°F). In contrast, May starts cooler, with minimum temperatures around 1°C (34°F), an average of 17°C (62°F), and maximums that can go up to 34°C (93°F). Additionally, May experiences significantly higher precipitation, with around 76 mm (3.0 in) over approximately 7 days, compared to September's 23 mm (0.9 in) over just 2 days. The humidity in May is also notably higher at 74%, while September maintains a drier atmosphere at 44%. For a more detailed look at May weather specifics, you can visit Nevada City weather in May.
When comparing the weather in September and June, both months show similar temperature ranges, with September boasting an average temperature of 21°C (70°F) while June has a slightly higher average at 22°C (72°F). September can reach a maximum of 41°C (106°F), just edging out June's peak of 40°C (104°F). However, June experiences higher humidity levels at 64%, compared to September's 44%, making June feel more humid and warmer despite the similar temperature averages. Precipitation is less frequent in June, with only 13 mm (0.5 in) over 2 days, compared to September's 23 mm (0.9 in) over the same number of days. For a detailed overview of June's weather, visit Nevada City weather in June.
When comparing the weather in September and July, it's clear that September experiences a drop in minimum temperatures, averaging around 5°C (41°F), compared to July's higher minimum of 11°C (53°F). The average temperature in September is also lower at 21°C (70°F) versus July's warmer 26°C (79°F). Both months can reach similar maximum temperatures, with September peaking at 41°C (106°F) and July slightly lower at 41°C (105°F). However, September sees more precipitation, accumulating 23 mm (0.9 in) over 2 days, whereas July has virtually no precipitation at 1 mm (0.0 in) over 0 days. Humidity remains consistent in both months at 44%. For more details on July weather, check out this link: Nevada City weather in July.
In comparing the weather between August and September, September exhibits a broader temperature range with minimums dropping to 5°C (41°F) and maximums reaching 41°C (106°F), while August has a milder minimum of 11°C (52°F) and a slightly lower maximum of 39°C (103°F). The average temperature in September is 21°C (70°F), compared to August's warmer average of 25°C (77°F). Additionally, September experiences a slight increase in precipitation with 23 mm (0.9 in) over 2 days, contrasted with the virtually dry August, which recorded only 2 mm (0.1 in) with no rainy days. Humidity is also higher in September at 44%, compared to 36% in August. For more details on August weather, visit Nevada City weather in August.
September and October exhibit significant variations in weather, with September experiencing warmer temperatures and lower humidity. In September, temperatures range from a minimum of 5°C (41°F) to a scorching maximum of 41°C (106°F), coupled with just 23 mm (0.9 in) of precipitation over two days and a humidity level of 44%. In contrast, October sees a notable drop in temperatures, with a minimum of 1°C (34°F) and an average of 15°C (60°F), peaking at 34°C (94°F). Additionally, October is significantly wetter, receiving 78 mm (3.1 in) of rainfall over three days and higher humidity at 65%. For more detailed information, you can check Nevada City weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a low of 5°C (41°F) to a high of 41°C (106°F), with an average temperature of 21°C (70°F), characterized by relatively low humidity at 44% and minimal precipitation of 23 mm (0.9 in) over just 2 days. In stark contrast, November sees cooler temperatures, with a minimum of -2°C (28°F) and an average of 10°C (51°F), peaking at 27°C (81°F). The month is wetter, recording a significant 157 mm (6.2 in) of precipitation across 7 days and higher humidity reaching 84%. For more detailed insights, you can check Nevada City weather in November.
In comparing the weather of September and December, distinct contrasts emerge. September typically enjoys warmer temperatures, with an average of 21°C (70°F) and highs reaching up to 41°C (106°F), while December sees much cooler averages, around 7°C (44°F), with lows dipping to -3°C (28°F). Precipitation also plays a significant role in the seasonal shift; September has minimal rainfall at just 23 mm (0.9 in) over 2 days, whereas December is much wetter, receiving 215 mm (8.4 in) across 11 days. Additionally, humidity levels rise dramatically in December, averaging 83% compared to September's 44%. For more detailed information, you can check Nevada City weather in December.
In September, Nevada City's weather emerges as a warm yet refreshing transition from the sweltering summer months to the cooler fall season. Characterized by average temperatures hovering around a pleasant 21°C, the days can notably reach up to 41°C, presenting a delightful mix of warmth and occasional respite. Unlike the heavier rains seen in other months, September experiences minimal precipitation, with only two days seeing light showers, maintaining a comfortable 44% humidity that keeps the air feeling fresh. This unique weather makes September an ideal time for outdoor adventures and enjoying the city's stunning landscapes. For a deeper look into the climate patterns, visit Nevada City Climate.