September Weather in Shasta, United States

Last updated: February 24, 2025

In Shasta, United States, September brings a striking temperature range, with maxima soaring to 43°C (109°F) and minima dipping to 7°C (44°F), resulting in an average temperature of 24°C (75°F). The month is predominantly dry, with a mere 9 mm (0.3 in) of precipitation recorded over just 1 day, accompanied by a comfortable humidity level of 62%. These conditions create an inviting atmosphere for outdoor activities while showcasing the beauty of early autumn in this scenic region.

September Temperature in Shasta

In September, Shasta, United States experiences a gentle transition from the scorching summer heat to the milder embrace of autumn. With a minimum temperature of 7°C (44°F) and an average around 24°C (75°F), days are pleasantly warm, yet refreshing. The maximum temperatures still reach a sizzling 43°C (109°F), echoing the summer's lingering warmth. This month serves as a bridge, offering a blend of seasonal opposites: the last vestiges of summer's heat paired with the crisp beginning of fall's coolness. Overall, September is characterized by its comfortable climate, making it an ideal time to explore the stunning outdoors before the chill of winter sets in.

September Weather in Shasta: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Shasta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec474952596778858375635346
Data source: Temperature data for Shasta 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.

September Precipitation in Shasta

In September, Shasta experiences a notable shift as summer fades, with precipitation recorded at 9 mm (0.3 in) over just one day. This sparse rainfall marks a transition from the dry summer months, where July and August saw almost no precipitation. As the region's water levels begin to replenish, September serves as a gentle precursor to the wetter fall months, where averages increase significantly in October and November. The minimal September rainfall is part of a broader trend in the region, indicating a distinct seasonal pattern where the dry summer gives way to the wetter autumn, setting the stage for rejuvenated landscapes as nature prepares for the winter months ahead.

September Precipitation Trends in Shasta

The chart displays monthly precipitation patterns in Shasta, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec2131921879259812966123149
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Shasta

September in Shasta, United States, marks a subtle transition in humidity levels, dipping slightly to 62% after the warm summer months. As the year unfolds, there's a clear trend of decreasing humidity, with the peak in January and February at a high 86% gradually declining to the most arid period in July at 70%. Following this peak summer dryness, September experiences a mild uptick in humidity, providing a refreshing contrast as autumn approaches. This slight rise hints at the upcoming seasonal shift, setting the stage for the wetter months ahead, evidenced by November's relative humidity soaring back to 87%. Thus, September serves as a gentle bridge between the summer's dryness and the fall's re-emerging moisture.

September Average Humidity in Shasta

This chart illustrates the average monthly humidity levels in Shasta, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Shasta

As September rolls in Shasta, United States, residents experience a notable UV Index of 9, categorizing the exposure as very high and indicating a burn time of just 15 minutes. This trend reflects the gradual decline from the extreme UV levels of summer, yet still signals a significant need for protective measures. Comparatively, the UV Index peaks in June at 11, but even as autumn approaches, the intensity remains strong enough to warrant caution. It's a reminder that while the days may grow shorter, the sun's rays can still pose a threat. For detailed information on the UV Index throughout the year, visit Shasta UV Index.

Maximum UV Index Levels in Shasta for September

The chart shows the monthly maximum UV Index (UVI) for Shasta in September, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3478101110109642
Data source: Shasta September 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.

September Sunshine in Shasta

September in Shasta, United States, ushers in a delightful transition as the summer's warmth begins to wane, yet the sun still shines brightly with 312 hours of sunshine. This marks a gradual decline from the peak summer months of June and July, which boast over 400 hours of sun. However, September still enjoys more sunshine than many earlier months like January and February, reflecting a strong lingering vibrancy of late summer. As the days grow shorter, this month captures an essence of change, beautifully balancing the glow of summer with the crispness of approaching autumn, setting the stage for a colorful fall ahead.

Monthly Sunshine Duration in Shasta: September Highlighted

The September sunshine duration represents the total number of hours Shasta experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec126h194h241h293h359h388h401h354h312h279h209h170h
Data source: Shasta September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Shasta During September

As summer transitions to fall, September in Shasta, United States, continues to enjoy a generous 82% chance of sunny weather, sustaining the warmth and brightness characteristic of the warmer months. While temperatures and sunshine gradually taper off after the vibrant peak of August, which boasts an impressive 91% chance of sun, September still offers a delightful escape from the impending chill of autumn. Notably, this month's likelihood of sunshine remains robust when compared to earlier months, particularly the winter and early spring, highlighting Shasta's advantageous climate during this lingering summer phase. Thus, September in Shasta is a perfect time for outdoor enthusiasts to relish the sun before the seasonal shift.

Percentage of Sunny Days in September in Shasta

The chart illustrates the percentage of sunny days in Shasta throughout the year, with September 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 Shasta experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec32%54%60%74%79%83%86%91%82%50%45%38%
Data source: Shasta September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Shasta in September

As September arrives in Shasta, the days begin to gently shorten, with a daylight duration of 12 hours. This marks a gradual decline from the sun-soaked heights of 15 hours in June and the lingering warmth of 14 hours in July and May. While autumn creeps in, this month heralds a transition from the vibrant summer months, where daylight peaked, to the twilight of fall, with October promising even less at 11 hours. Observing this trend, one can appreciate how the rhythm of day and night evolves, inviting a cozy atmosphere as the leaves start to turn and the days grow cooler.

Average Daylight Hours in Shasta for September

The chart illustrates the variation in daylight duration in Shasta throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 38m10h 40m11h 58m13h 19m14h 27m15h14h 42m13h 41m12h 24m11h 3m9h 53m9h 18m
Data source: Shasta daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Shasta

As September rolls in Shasta, a gentle breeze graces the region with an average wind speed of 2.0 m/s (5 mph), maintaining the tranquil vibe of summer's end. Observing the trend throughout the year, the wind speeds see a slight uptick in May, peaking at 2.5 m/s (6 mph) before gradually returning to the calmer currents of late summer and early fall. From January to September, the winds remain relatively steady, oscillating between 1.9 m/s (4 mph) to 2.5 m/s (6 mph), suggesting a consistent and soothing breath of air. This predictable pattern fosters an inviting atmosphere, making September a perfect time to enjoy the natural beauty of Shasta while savoring the pleasant winds that accompany the changing seasons.

Average September Wind Speed in Shasta

The chart displays monthly wind speed patterns in Shasta, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.02.22.32.22.52.22.02.02.0 m/s2.12.01.9
Data source: Shasta September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Shasta Compares to Other Months

The weather in Shasta 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 Shasta and find detailed weather information for every month.

September and January present stark contrasts in weather conditions. September boasts a warm average temperature of 24°C (75°F), with highs reaching up to 43°C (109°F), while experiencing minimal precipitation of just 9 mm (0.3 in) over one day, and a humidity level of 62%. In contrast, January sees much cooler temperatures, with a range from -3°C (27°F) at night to a mild maximum of 21°C (70°F) during the day. Additionally, January brings significantly more rainfall, accumulating 213 mm (8.4 in) over 12 days, accompanied by higher humidity at 86%. To learn more about the specifics of January weather, you can explore Shasta weather in January.

September and February present stark contrasts in weather patterns. In September, temperatures can range from a cool 7°C (44°F) during the night to a scorching high of 43°C (109°F), with an average of 24°C (75°F), accompanied by low precipitation of just 9 mm (0.3 in) over a mere day. The humidity during this month is relatively moderate at 62%.

Conversely, February experiences much cooler temperatures, with lows dipping to -3°C (27°F) and an average of only 9°C (49°F), while highs reach a milder 27°C (81°F). This month is characterized by significantly higher precipitation, totaling 192 mm (7.5 in) over about nine days, and higher humidity levels at 85%. For more detailed insights on February weather, you can visit Shasta weather in February.

When comparing the weather in September and March, significant differences emerge. September experiences warmer temperatures, with a minimum of 7°C (44°F) and an average of 24°C (75°F), while March sees cooler conditions, starting at a minimum of 0°C (32°F) and averaging only 11°C (52°F). The high in September can reach a scorching 43°C (109°F), contrasting sharply with March's maximum of 27°C (81°F). Precipitation levels are much higher in March, with 187 mm (7.4 in) over 14 days, compared to the light 9 mm (0.3 in) of rain in September, which typically has only 1 rainy day. Humidity is also elevated in March at 85%, compared to September's 62%. For more detailed information, you can visit Shasta weather in March.

September and April present contrasting weather conditions, reflecting a significant shift in the seasons. In September, temperatures range from a minimum of 7°C (44°F) to a scorching maximum of 43°C (109°F), with an average of 24°C (75°F). The month is relatively dry, receiving only 9 mm (0.3 in) of precipitation over just one day and featuring a humidity level of 62%. In stark contrast, April experiences cooler temperatures, with a minimum of 1°C (35°F) and a maximum of 33°C (91°F), averaging around 15°C (59°F). This month is marked by higher rainfall, totaling 92 mm (3.6 in) over eight days, along with increased humidity at 82%. For a more detailed look at April weather patterns, you can visit Shasta weather in April.

September tends to be much warmer, with average temperatures around 24°C (75°F) and highs reaching up to 43°C (109°F), while May features a cooler average of 20°C (68°F) and max temperatures of 38°C (101°F). Additionally, September experiences relatively low precipitation with only 9 mm (0.3 in) over just 1 day, contrasting sharply with May’s higher rainfall of 59 mm (2.3 in) spread over 5 days. Humidity levels are also higher in May at 81%, compared to September’s 62%, making May feel more muggy despite the slightly lower temperatures. For a more detailed look at May weather patterns, visit Shasta weather in May.

In comparing the weather of September and June, both months experience similar maximum temperatures, peaking at 43°C (109°F). However, September tends to be slightly cooler on average at 24°C (75°F) compared to June's average of 25°C (78°F). Additionally, June has a higher humidity level at 79%, making it feel a bit more uncomfortable despite only a marginal difference in precipitation, with June receiving 8 mm (0.3 in) compared to September's 9 mm (0.3 in). For more details on June weather conditions, you can check Shasta weather in June.

In September, temperatures begin to cool down from the summer heat, with a minimum of 7°C (44°F) and an average of 24°C (75°F), while still experiencing high extremes that can reach 43°C (109°F). The month sees minimal precipitation with only 9 mm (0.3 in) over just one day, and humidity levels are around 62%. In contrast, July is warmer overall, starting at a minimum of 16°C (61°F) and averaging 30°C (86°F) with a maximum that can peak at 44°C (111°F). It also has significantly less precipitation, with just 1 mm (0.0 in) and no rainy days, but higher humidity levels at 70%. For more details on July's weather conditions, you can visit Shasta weather in July.

In September, the weather contrasts significantly with August. While September shows a wider temperature range, with a minimum of 7°C (44°F) and a maximum of 43°C (109°F), August remains warmer overall, boasting an average temperature of 28°C (83°F) and reaching a peak of 44°C (112°F). Additionally, September experiences slightly more precipitation at 9 mm (0.3 in) over just one day, compared to August's minimal 2 mm (0.1 in) with no recorded rainy days. Humidity levels are fairly similar, with September at 62% and August slightly lower at 60%. For a more detailed look at August weather, visit Shasta weather in August.

September typically experiences warmer temperatures, with an average of 24°C (75°F) and highs reaching up to 43°C (109°F), while October sees a significant drop, with an average temperature of 17°C (64°F) and maximums of 38°C (101°F). Additionally, September is relatively dry, with only 9 mm (0.3 in) of precipitation over just one day, in contrast to October, which brings much wetter conditions with 66 mm (2.6 in) over four days. Humidity also increases slightly in October, rising to 72% compared to September's 62%. For a more detailed look at the weather trends in October, visit Shasta weather in October.

September and November present markedly different weather conditions. In September, temperatures range from a minimum of 7°C (44°F) to a maximum of 43°C (109°F), with an average of 24°C (75°F) and low precipitation, totaling just 9 mm (0.3 in) over the course of only 1 day. The humidity sits at a comfortable 62%. In contrast, November experiences much cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 29°C (84°F), averaging 12°C (54°F). This month is also significantly wetter, with precipitation reaching 123 mm (4.8 in) across 7 days and a higher humidity level of 87%. For more insights on the weather in November, you can check Shasta weather in November.

September and December present stark contrasts in weather. In September, temperatures can soar with an average of 24°C (75°F) and highs reaching as much as 43°C (109°F), accompanied by relatively low precipitation of just 9 mm (0.3 in) over 1 day, and a moderate humidity level of 62%. In contrast, December brings much cooler temperatures, with a minimum of -1°C (30°F) and an average of only 8°C (46°F). December is also notably wetter, recording 149 mm (5.9 in) of precipitation over 11 days and higher humidity at 86%. The shift from the dry heat of September to the cold, damp climate of December is striking, marking a significant seasonal transition. For more details, you can check Shasta weather in December.

Compare Shasta's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Shasta

As September unfolds in Shasta, the weather showcases a unique blend of warmth and dryness that distinguishes it from other months. With maximum temperatures soaring to a scorching 43°C (109°F), the days often feel like a sun-drenched escape, while the average temperature settles comfortably at 24°C (75°F), perfect for outdoor adventures. However, nights can take a cooler turn, dipping down to around 7°C (44°F). The month experiences minimal rainfall, accumulating just 9 mm (0.3 in) over a single day, resulting in a predominantly dry landscape, all while maintaining a moderate humidity level of 62%. This combination of heat during the day and cooler nights, coupled with limited precipitation, makes September an exceptional month for enjoying the diverse beauty of Shasta. For more detailed insights on climate patterns, be sure to check Shasta Climate.