September Weather in Mariposa, United States

Last updated: February 24, 2025

In September, Mariposa, United States experiences a dramatic range in temperatures, with maximums soaring up to 41°C (106°F), while the average temperature settles comfortably at 23°C (74°F). The nights can be cool, dropping to a minimum of 7°C (45°F). This month boasts a remarkably dry climate, recording just 2 mm (0.1 in) of precipitation over zero rainy days, and maintaining a moderate humidity level of 55%. The combination of warm days and cool nights makes September an inviting time for outdoor activities in this picturesque region.

September Temperature in Mariposa

September in Mariposa, United States, marks a transition toward cooler autumn temperatures while still retaining traces of summer warmth. With minimums around 7°C (45°F) and an average temperature of 23°C (74°F), the month offers a comfortable climate for outdoor activities. The highs can still soar to a steamy 41°C (106°F), reminiscent of the intense summer heat. This blend of warm days and cooler nights suggests a gradual shift, inviting visitors to enjoy the vibrant landscapes transitioning into fall, as well as making it a perfect time for hiking and exploration before winter sets in.

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

The chart illustrates September temperature patterns in Mariposa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec474851586475828174635446
Data source: Temperature data for Mariposa 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 Mariposa

In September, precipitation in Mariposa, United States, is remarkably sparse, with only 2 mm (0.1 in) recorded, mirroring the dry trend established in the preceding summer months. It’s notable that September has no recorded precipitation days, aligning with the dry spell that spans from June to August, where rainfall was virtually nonexistent. This minimal rainfall continues the pattern of declining precipitation typical for the late summer and early fall, as the region prepares for the slight increase that usually follows in October. Overall, September serves as a transitional month, marking the end of the dry season and the gradual shift towards the wetter months ahead.

September Precipitation Trends in Mariposa

The chart displays monthly precipitation patterns in Mariposa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec169157181674120123164123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mariposa

In September, the humidity in Mariposa, United States, settles at a comfortable 55%, marking a gradual continuation of the decline from the summer months. After peaking in January at 82%, the area experiences a steady decrease as the year progresses, with the most significant drop occurring during the summer. By August, humidity levels reach their lowest point at 54%, and September maintains a similar dry trend. This gradual transition hints at the refreshing shift towards autumn, as humidity levels begin to rise again in October to 62%. Overall, the year showcases a clear pattern of decreasing humidity in the warmer months, followed by a mild increase as cooler weather approaches.

September Average Humidity in Mariposa

This chart illustrates the average monthly humidity levels in Mariposa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mariposa

In September, Mariposa experiences a very high UV Index of 9, prompting sun safety precautions as the burn time drops to just 15 minutes. This month's UV levels show a slight decline from the extreme values recorded in the summer, yet they still require vigilance. As the year progresses, we notice a pattern: January through March starts with moderate exposure, escalating to extreme levels from May to August, before tapering off as autumn approaches. With the sun's intensity shifting, it’s essential to remain informed and protected. For more insights, visit Mariposa UV Index.

Maximum UV Index Levels in Mariposa for September

The chart shows the monthly maximum UV Index (UVI) for Mariposa 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.
JanFebMarAprMayJunJulAugSepOctNovDec4589111211119753
Data source: Mariposa 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 Mariposa

September in Mariposa welcomes a gentle shift, with 319 hours of sunshine that mark the transition into autumn. As the summer peaks in July with a robust 390 hours, the sunlight begins to wane gradually, yet September still boasts significant brightness, drawing in visitors eager to savor the lingering warmth. The month retains a generous amount of sunlight, surpassing both the fall months of October (290 hours) and November (235 hours), creating an ideal backdrop for outdoor adventures amidst the changing leaves. With September’s golden glow, Mariposa offers a perfect harmony of summer's end and autumn's arrival, making it a captivating time to explore the natural beauty of this charming region.

Monthly Sunshine Duration in Mariposa: September Highlighted

The September sunshine duration represents the total number of hours Mariposa 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.
JanFebMarAprMayJunJulAugSepOctNovDec161h215h258h309h359h385h390h362h319h290h235h204h
Data source: Mariposa September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mariposa During September

As summer begins to fade, September in Mariposa boasts an impressive 92% chance of sunny weather, making it one of the sunniest months of the year. This trend highlights a gradual increase in sunshine from the earlier months, peaking in August with an astounding 97% and maintaining a robust level into September. The month serves as a delightful bridge between the intense heat of summer and the milder autumn, clearly illustrating a season where clear skies are almost guaranteed. Following September, the likelihood of sunshine gently declines, signaling the arrival of fall. Thus, if you're planning to enjoy the beautiful outdoors, September is a prime time in Mariposa!

Percentage of Sunny Days in September in Mariposa

The chart illustrates the percentage of sunny days in Mariposa 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 Mariposa experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec49%59%59%75%87%88%83%97%92%66%68%43%
Data source: Mariposa September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mariposa in September

As September arrives in Mariposa, daylight begins its gentle descent, offering around 12 hours of sunlight—a noticeable shift from the summer peak of 14 hours in June, July, and early August. This transition marks the start of autumn, where the gradual shortening of days highlights the seasonal rhythm of the year. After basking in the long, sunlit hours of summer, residents can now enjoy the rich hues of fall as daylight wanes and evenings grow cooler. September's balance of light and darkness invites reflection and appreciation for nature's changing canvas, setting the stage for the cozy months ahead.

Average Daylight Hours in Mariposa for September

The chart illustrates the variation in daylight duration in Mariposa throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 53m10h 48m11h 59m13h 11m14h 12m14h 42m14h 25m13h 31m12h 22m11h 10m10h 7m9h 36m
Data source: Mariposa daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Mariposa

As September arrives in Mariposa, the average wind speed settles at a gentle 1.9 m/s (4 mph), mirroring the conditions of previous months from January to August. This consistency suggests that the winds during early fall are moderate, neither too brisk nor too still, creating a serene atmosphere perfect for enjoying the changing colors of the landscape. As the seasons transition, slight fluctuations in wind speed can be observed, with a mild uptick in May and June, reaching 2.2 m/s (5 mph), before returning to this more tranquil pace. While the winds calm down significantly by November to just 1.5 m/s (3 mph), September maintains a reliable breeziness that invites relaxation and contemplation in the stunning surroundings of Mariposa.

Average September Wind Speed in Mariposa

The chart displays monthly wind speed patterns in Mariposa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.91.71.91.92.22.12.01.91.9 m/s2.01.52.0
Data source: Mariposa September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Mariposa Compares to Other Months

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

September weather is characterized by warm temperatures, with a minimum of 7°C (45°F) and an average high reaching up to 41°C (106°F). The month experiences minimal precipitation, typically just 2 mm (0.1 inches) over no rainy days, and maintains a moderate humidity level of 55%.

In contrast, January brings much cooler temperatures, with a minimum of -4°C (25°F) and an average high of 22°C (72°F). Precipitation is significantly higher during this month, averaging 168 mm (6.6 inches) over about 8 rainy days, alongside increased humidity at 82%. These differences illustrate the stark seasonal transition, making September a dry and warm month compared to the colder and wetter January. For more detailed information, check out Mariposa weather in January.

September's weather boasts a much warmer profile, with average temperatures reaching around 23°C (74°F) and highs soaring to 41°C (106°F). This dry month sees minimal precipitation, only about 2 mm, and typically experiences low humidity levels at 55%. In contrast, February presents a stark change, characterized by much cooler temperatures averaging 9°C (48°F) and lows dropping to -7°C (20°F). This month is also notably wetter, with 157 mm of precipitation over 9 days and higher humidity at 84%. For a detailed look at February's climate, you can refer to Mariposa weather in February.

September and March showcase contrasting weather patterns. In September, temperatures can soar as high as 41°C (106°F), with a pleasant average of 23°C (74°F) and minimal precipitation, making it a dry month with only 2 mm (0.1 in) of rain. The humidity stands at a comfortable 55%. In stark contrast, March experiences cooler temperatures, with a minimum of -4°C (25°F) and an average of 11°C (51°F), peaking at 27°C (81°F). This month is notably wetter, featuring significant rainfall of 181 mm (7.1 in) over 12 days and higher humidity at 82%. For more detailed insights into March weather, check out Mariposa weather in March.

September and April present markedly different weather conditions. In September, temperatures range from a cool 7°C (45°F) to a scorching 41°C (106°F), with an average of 23°C (74°F) and virtually no precipitation. The humidity hovers around 55%, creating a warm and dry atmosphere. In contrast, April experiences significantly cooler temperatures, with a minimum of -2°C (30°F) and a maximum of 30°C (87°F). The average temperature is a mild 14°C (58°F), accompanied by frequent rain, totaling 67 mm (2.6 in) over five days. The relative humidity rises to 78%, making April feel much more damp and cool. For more details on April weather, visit Mariposa weather in April.

September and May present contrasting weather patterns. In September, temperatures can soar with a maximum of 41°C (106°F) and typically enjoy minimal precipitation, averaging only 2 mm (0.1 in) across the month. Humidity is relatively moderate at 55%, making it a hot, dry month. In contrast, May experiences cooler temperatures, with a maximum of 36°C (97°F) and an average of 18°C (64°F). However, it also sees significantly more rainfall, with total precipitation reaching 41 mm (1.6 in) over three days, and higher humidity levels at 71%. For those interested in a deeper dive into May's weather specifics, check out Mariposa weather in May.

In September, the weather features a slightly broader temperature range, with minimums as low as 7°C (45°F) and maximums reaching up to 41°C (106°F), while the average temperature sits at 23°C (74°F). The month also experiences minimal precipitation, totaling just 2 mm (0.1 in) with no rainy days, and a humidity level of 55%.

In contrast, June has a similar minimum temperature of 7°C (45°F), but maintains a slightly higher average of 24°C (75°F) and a maximum temperature of 40°C (105°F). Like September, June also records no precipitation, but it has higher humidity at 64%. For more details on the weather patterns in June, you can visit Mariposa weather in June.

In comparing the weather between September and July, September exhibits a broader range of temperatures, with a minimum of 7°C (45°F) and an impressive maximum reaching 41°C (106°F). The average temperature in September is 23°C (74°F) with a relatively low humidity level of 55%. In contrast, July is warmer overall, with a minimum temperature of 14°C (58°F) and an average of 28°C (82°F), maintaining the same maximum temperature of 41°C (106°F). Notably, both months experience negligible rainfall, with July recording no precipitation, as indicated in this detailed overview: Mariposa weather in July. July's slightly higher humidity at 58% contributes to a more sultry feel compared to September's drier conditions.

In comparing the weather between August and September, both months experience high maximum temperatures, with September peaking at 41°C (106°F) and August slightly higher at 41°C (107°F). However, September sees a notable decrease in minimum temperatures, dropping to 7°C (45°F), compared to August’s milder minimum of 14°C (58°F). The average temperature also reflects this cooling trend, with September averaging 23°C (74°F) versus August’s warmer average of 27°C (81°F). Both months have very little precipitation, with September receiving just 2 mm and August 1 mm, and neither month seeing any rainy days. Humidity levels are fairly similar, with September at 55% and August slightly lower at 54%. For more details on August weather, you can visit Mariposa weather in August.

September typically boasts much warmer temperatures, with a minimum of 7°C and an average high reaching as high as 41°C, making it the hotter month overall. In contrast, October sees a significant drop in temperatures, with a minimum of 3°C and an average high of 34°C. Additionally, October experiences more precipitation with 31 mm recorded over just one day, compared to September’s virtually dry climate. Humidity levels also increase slightly in October to 62% from September's 55%. For more detailed information, you can visit Mariposa weather in October.

September weather is marked by warm temperatures, with averages around 23°C (74°F) and highs reaching up to 41°C (106°F), making it feel quite summer-like. With only 2 mm of precipitation and 0 rainy days, the month is typically dry and comfortable, with humidity levels at 55%. In contrast, November brings a significant shift, with lower average temperatures around 12°C (54°F), and nighttime lows dropping to -3°C (28°F). The month sees increased precipitation of 64 mm (2.5 in) over about 4 days, and a rise in humidity to 78%, resulting in a much cooler and often wetter climate. For more details, you can check out Mariposa weather in November.

September and December present starkly contrasting weather conditions. In September, temperatures can soar to a maximum of 41°C (106°F), with an average of 23°C (74°F) and minimal precipitation, making it a dry month with only 2 mm (0.1 in) of rain and no rainy days. The humidity level is relatively moderate at 55%. In contrast, December features a much cooler climate, with temperatures ranging from a minimum of -2°C (29°F) to a maximum of 23°C (74°F) and an average temperature of 8°C (47°F). This winter month also experiences significant rainfall, totaling 123 mm (4.9 in) over 9 days, accompanied by higher humidity levels at 80%. For more details on December weather patterns, check Mariposa weather in December.

Compare Mariposa's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Mariposa

As summer winds down, September in Mariposa brings a striking contrast to the preceding months. With comfortable average temperatures hovering around 23°C (74°F) and minimal precipitation—we're talking just 2 mm throughout the month—it's a delightful time to experience the outdoors. The days are warm, peaking at impressive highs of up to 41°C (106°F), while the nights cool down pleasantly, creating an ideal environment for evening activities. The humidity rests at a moderate 55%, making the warmth feel more manageable than earlier in the sweltering summer. For those looking to explore Mariposa's unique charm, September offers a perfect blend of summer’s warmth and the onset of autumn’s tranquility. For more on the area's patterns, check out Mariposa Climate.