September Weather in Santa Clara, Portugal

Last updated: February 24, 2025

In September, Santa Clara, Portugal, experiences a diverse climate characterized by maximum temperatures soaring up to 37°C (98°F), while the average hovers around a comfortable 20°C (69°F). Visitors can expect early autumn warmth, with nighttime lows dipping to 9°C (49°F). This month also witnesses occasional rainfall, with a total precipitation of 36 mm (1.4 in) spread across 4 days, contributing to a humidity level of 71%. Whether basking in the sun or enjoying the refreshing showers, September in Santa Clara offers a pleasant blend of summer and fall vibes.

September Temperature in Santa Clara

In September, Santa Clara, Portugal, showcases a delightful transition as summer begins to wane, marked by temperatures that generally range from a minimum of 9°C (49°F) to a maximum of 37°C (98°F). The average temperature rests comfortably at 20°C (69°F), making it a pleasant time for outdoor activities. While the warm days echo the high heat of August, early autumn brings a slight coolness in the evenings, inviting a more refreshing experience. This month continues a trend of warm weather, yet hints at the crispness to come as the region shifts gears towards the cooler months ahead. The balance of warmth and cooler nights creates an inviting atmosphere, perfect for enjoying the region's natural beauty.

September Weather in Santa Clara: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Santa Clara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec485254586366707068635552
Data source: Temperature data for Santa Clara generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Santa Clara

In September, Santa Clara experiences a moderate shift in precipitation, receiving about 36 mm (1.4 in) of rain over 4 days. This marks a noticeable increase compared to the arid summer months, where both July and August saw minimal rainfall with only 8 mm and 9 mm, respectively. As the region transitions into autumn, the total precipitation begins to rise again, setting the stage for a wetter October ahead, which typically averages 91 mm (3.6 in). The pattern observed in September hints at a rejuvenation of the landscape, bridging the dry, sun-drenched summer with the wetter seasons to come, making it a crucial month in the annual precipitation cycle of Santa Clara.

September Precipitation Trends in Santa Clara

The chart displays monthly precipitation patterns in Santa Clara, 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.
JanFebMarAprMayJunJulAugSepOctNovDec63881171205731893691126112
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Santa Clara

In September, Santa Clara, Portugal experiences a notable shift in humidity, with levels around 71%, reflecting a gradual transition from the summer months. This is a slight increase from the summer's low of 63% in July and 64% in August, which are the driest months of the year. As the region moves closer to autumn, there’s a discernible uptick in moisture, hinting at the upcoming seasonal changes. This trend continues into the fall, where October sees humidity rise further to 79%, and November peaks at 86%, indicating a return to the more humid conditions characteristic of the winter months. Overall, September serves as a bridge, marking the end of summer's dryness and heralding the moist embrace of autumn.

September Average Humidity in Santa Clara

This chart illustrates the average monthly humidity levels in Santa Clara, 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.
JanFebMarAprMayJunJulAugSepOctNovDec87%81%78%79%78%71%63%64%71%79%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Santa Clara

In September, Santa Clara, Portugal, experiences a very high UV Index of 8, indicating that sun exposure can lead to skin damage in as little as 15 minutes. This slight decrease from the peak 11 in June highlights a gradual transition into fall, but awareness remains crucial as the sun still poses significant risks. This month often retains the summer's warmth, so locals and visitors should continue to take preventive measures such as wearing sunscreen and protective clothing. For detailed information on the UV Index throughout the year, you can check the link here: Santa Clara UV Index.

Maximum UV Index Levels in Santa Clara for September

The chart shows the monthly maximum UV Index (UVI) for Santa Clara 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.
JanFebMarAprMayJunJulAugSepOctNovDec34689111098642
Data source: Santa Clara 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 Santa Clara

September in Santa Clara, Portugal, offers a delightful transition into autumn, boasting an impressive 345 hours of sunshine. This marks a slight decline from the summer peak in July, which basks in 425 hours of sunlight, yet still showcases a vibrant glow as the days begin to shorten. Following the steady ascent from winter's 169 hours in January to summer's zenith, September retains a generous warmth, signaling nature’s farewell to summer while hinting at the cozy charm of fall. As the sun casts its golden rays over the landscape, this month underscores a trend of abundant sunshine, promising delightful days for both residents and visitors alike.

Monthly Sunshine Duration in Santa Clara: September Highlighted

The September sunshine duration represents the total number of hours Santa Clara 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.
JanFebMarAprMayJunJulAugSepOctNovDec169h216h291h344h407h408h425h395h345h306h215h192h
Data source: Santa Clara September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Santa Clara During September

September in Santa Clara, Portugal, offers a moderate chance of sunny weather, with about 46% likelihood of sunshine. This month sits in a transitional phase, as summer's peak months, July and August, boast a notable 61% and 67% chance of clear skies respectively. Following this trend, the sunny probabilities dip slightly in September before rising again in October to 50%. This pattern suggests that while September may not be the sunniest month, it retains a pleasant charm that signals the tail end of summer, making it an inviting time for visitors seeking both warmth and fewer crowds.

Percentage of Sunny Days in September in Santa Clara

The chart illustrates the percentage of sunny days in Santa Clara 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 Santa Clara experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec48%20%57%37%48%58%61%67%46%50%68%38%
Data source: Santa Clara September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Santa Clara in September

As summer gently transitions into autumn, September in Santa Clara, Portugal, offers a delightful balance of light, with 12 hours of daylight. This month marks a gradual decline from the sun-drenched days of July and August, which boast a maximum of 14 hours, inviting longer evenings that hint at the upcoming shifts in season. The daylight progressively wanes, falling to 11 hours by October, yet September still retains a warm glow, making it an ideal time for outdoor adventures and enjoying the lingering warmth of summer before the shorter days of fall fully set in. The steady rhythm of daylight in Santa Clara throughout the year showcases a beautiful cycle, with each month inviting residents and visitors to embrace the changing light in unique ways.

Average Daylight Hours in Santa Clara for September

The chart illustrates the variation in daylight duration in Santa Clara throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 39m10h 40m11h 58m13h 17m14h 24m14h 58m14h 40m13h 40m12h 24m11h 5m9h 56m9h 20m
Data source: Santa Clara daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Santa Clara

As summer yields to autumn, September winds in Santa Clara, Portugal, reflect a gentle transition, with an average wind speed of 2.6 m/s (6 mph). This slight dip follows the midsummer breezes, which hovered around 3.3 m/s (7 mph) in July, creating a more tranquil atmosphere. August also saw a decrease, bringing the winds down further, creating a soothing backdrop for the end of the season. Interestingly, the wind patterns this year reveal a consistent trend of softer breezes as temperatures begin to cool, setting a serene tone that contrasts with the stronger gusts of January and February. As the year progresses into October and November, the winds remain stable, maintaining this calmness, while the approaching chill of winter will soon prompt a natural shift in the weather dynamics.

Average September Wind Speed in Santa Clara

The chart displays monthly wind speed patterns in Santa Clara, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.33.72.82.43.13.03.32.72.6 m/s2.62.73.6
Data source: Santa Clara September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Santa Clara Compares to Other Months

The weather in Santa Clara 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 Santa Clara and find detailed weather information for every month.

In September, the weather is characterized by warmer temperatures, with minimums around 9°C (49°F) and daytime highs reaching up to 37°C (98°F), while average temperatures sit comfortably at 20°C (69°F). This month generally experiences lower humidity levels at 71% and less precipitation, averaging 36 mm (1.4 in) over just 4 days. In contrast, January brings much cooler conditions, with minimum temperatures dropping to -3°C (27°F) and an average of 9°C (48°F), peaking at 20°C (69°F). This winter month is marked by higher humidity at 87% and increased rainfall, totaling 63 mm (2.5 in) across 7 days. For more detailed insights into the January climate, check out Santa Clara weather in January.

September and February present contrasting weather patterns. September enjoys a warmer climate with average temperatures around 20°C (69°F) and high peaks reaching up to 37°C (98°F), coupled with relatively low precipitation of 36 mm (1.4 in) over just 4 days. In contrast, February experiences much cooler weather, with average temperatures around 11°C (53°F) and lows that can dip to -1°C (31°F). Additionally, February is wetter, receiving 88 mm (3.5 in) of precipitation spread over 9 days, and a higher humidity level of 81%. For a more detailed look at February weather, check out Santa Clara weather in February.

When comparing the weather in September and March, there's a noticeable contrast in temperature and precipitation patterns. September tends to be much warmer, with average temperatures around 20°C (69°F) and maximum highs reaching up to 37°C (98°F). In contrast, March is cooler, with average temperatures at 12°C (55°F) and maximums of 27°C (81°F). Moreover, March experiences significantly more rainfall, averaging 117 mm (4.6 in) over about 11 days, compared to September's 36 mm (1.4 in) over 4 days. The humidity is also slightly higher in March at 78%, compared to 71% in September. For a more detailed look at conditions in March, you can visit Santa Clara weather in March.

September and April present contrasting weather patterns. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 37°C (98°F), with an average of 20°C (69°F), making it a warmer month overall. The month experiences lower precipitation of 36 mm (1.4 in) over just 4 days, accompanied by a humidity level of 71%. In contrast, April features cooler temperatures, with lows of 4°C (39°F) and highs reaching 28°C (84°F), averaging at 14°C (58°F). It is a wetter month, receiving 120 mm (4.7 in) of rainfall spread across 13 days, and the humidity is slightly higher at 79%. For more details, check out Santa Clara weather in April.

In comparing the weather of September and May, we observe distinct differences in temperature and precipitation. September tends to be warmer, with average highs reaching up to 37°C (98°F) and an average temperature of 20°C (69°F), whereas May has cooler conditions, averaging 17°C (63°F) with maximum temperatures of 33°C (92°F). Additionally, May experiences more rainfall, with 56 mm (2.2 in) over approximately 8 days compared to September's 36 mm (1.4 in) over just 4 days. Humidity levels are also slightly higher in May at 78%, compared to September's 71%. For more details on weather trends, you can visit Santa Clara weather in May.

In comparing the weather of September and June, both months experience relatively mild temperatures, with September having an average of 20°C (69°F) and June slightly cooler at 19°C (66°F). The maximum temperatures are quite similar as well, peaking at 37°C (98°F) in September and 36°C (98°F) in June. However, June sees more rainy days, with precipitation occurring on 8 days compared to just 4 days in September. Despite this, both months maintain the same humidity level of 71%. For more specific details about June weather, check out Santa Clara weather in June.

When comparing the weather in September to that of July, we see some distinct differences. September experiences slightly cooler temperatures, with an average of 20°C (69°F) compared to July's average of 21°C (70°F). Both months can reach a maximum of 37°C (98°F) to 100°F, but September tends to be more variable, with a minimum temperature of 9°C (49°F), while July has a higher minimum of 11°C (52°F). In terms of precipitation, September sees a total of 36 mm (1.4 in) over 4 days, indicating a wetter month, whereas July has only 8 mm (0.3 in) across 2 days, making it drier. Additionally, September has higher humidity levels at 71%, compared to 63% in July. For more details on July weather, you can visit Santa Clara weather in July.

In comparing the weather between August and September, we see notable differences in temperature and humidity. August featured slightly warmer temperatures, with a minimum of 11°C (52°F), an average of 21°C (70°F), and a maximum of 39°C (103°F). It also recorded minimal precipitation of just 9 mm (0.3 in) over a single day and a lower humidity level of 64%. In contrast, September showcased a broader temperature range with a minimum of 9°C (49°F) and a maximum of 37°C (98°F), averaging around 20°C (69°F). This month experienced increased rainfall totaling 36 mm (1.4 in) across four days, along with a higher humidity level of 71%. For more details on August weather, you can check Santa Clara weather in August.

September typically offers warmer temperatures, with an average high of 20°C (69°F) and maxing out at 37°C (98°F), while October sees a slight decrease, averaging around 17°C (63°F) with a maximum of 35°C (96°F). Precipitation also increases in October, with total rainfall reaching 91 mm (3.6 in) over 8 days compared to September's 36 mm (1.4 in) over just 4 days. Additionally, humidity is higher in October at 79% compared to September's 71%, contributing to a more autumnal feel as the season progresses. For more detailed insights, check out Santa Clara weather in October.

September and November present markedly different weather patterns. In September, temperatures range from a mild 9°C (49°F) at night to a warm 37°C (98°F) during the day, with an average of 20°C (69°F). The month sees limited precipitation, recording only 36 mm (1.4 in) over four days, and lower humidity at 71%. In contrast, November experiences cooler conditions with minimum temperatures dropping to 2°C (36°F) and an average of 13°C (55°F). The maximum temperature reaches 25°C (77°F), but the month is much wetter, with a total of 126 mm (5.0 in) of rain over 13 days and increased humidity at 86%. For more details, check out Santa Clara weather in November.

September's weather is typically warm, with temperatures ranging from a mild 9°C (49°F) to a high of 37°C (98°F), and an average of 20°C (69°F). Rainfall is relatively low, with only about 36 mm (1.4 in) of precipitation spread over 4 days, and humidity sits at 71%. In contrast, December brings much cooler temperatures, with a minimum of -2°C (28°F) and a maximum of 19°C (67°F); the average temperature is around 11°C (52°F). The month is significantly wetter, receiving 112 mm (4.4 in) of precipitation over 12 days, and the humidity rises to 87%. For more detailed insights, you can check Santa Clara weather in December.

Compare Santa Clara's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Santa Clara

In September, Santa Clara experiences a unique transition in weather, blending the warmth of summer with the freshness of autumn. With temperatures peaking at 37°C and dropping to a cool 9°C at night, the month offers a pleasant average that encourages outdoor activities. Unlike the heavier rains of winter, September sees only a modest amount of precipitation spread over a few days, allowing for plenty of sunshine and comfortable humidity levels. This combination creates an inviting atmosphere, perfect for enjoying the stunning landscapes of the region. For more detailed insights into how this month fits into the overall climate, check out Santa Clara Climate.