September Weather in Blue Lake, United States

Last updated: February 24, 2025

September in Blue Lake, United States, greets visitors with a delightful mix of warm days and cool nights. With maximum temperatures reaching a comfortable 31°C (88°F) and an average of 15°C (59°F), this month offers plenty of opportunities for outdoor activities. Evenings cool down to a brisk 7°C (45°F), perfect for cozy gatherings. Rainfall is modest, with a total of 35 mm (1.4 in) distributed over just 3 days, making it an inviting time for exploration. The humidity level hovers around 62%, adding a pleasant touch to the refreshing breezes typical of this transitional period. Whether you're hiking, picnicking, or simply enjoying the scenery, Blue Lake in September promises a memorable experience.

September Temperature in Blue Lake

In September, Blue Lake experiences a significant transition from summer to autumn, with temperatures reflecting this shift. The month starts with a comfortable average of 15°C (59°F), where daytime highs can reach a warm 31°C (88°F). Nights become cooler, dropping to a minimum of 7°C (45°F), marking a notable change from the warmth of August. This blend of mild days and brisk evenings creates a perfect opportunity for outdoor activities, as the landscape begins to change with the hint of fall. The gradual decline in temperatures from the highs of summer signals a cozy winding down of the year, making September a unique and inviting month in Blue Lake.

September Weather in Blue Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Blue Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec464546495257596159544945
Data source: Temperature data for Blue Lake 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 Blue Lake

September in Blue Lake marks a modest uptick in precipitation, with 35 mm (1.4 in) of rain falling over 3 days. This slight increase contrasts sharply with the dry summer months of July and August, which recorded a mere 6 mm and 5 mm respectively. The transition from the arid warmth of summer to the cooler embrace of autumn is underscored by this rise in rainfall, but September still remains relatively dry compared to the wetter months ahead. As the region prepares for the more substantial downpours of October and November, this early fall rainfall serves as a gentle reminder of the seasonal shift, foreshadowing the lushness that will return with the approaching winter months.

September Precipitation Trends in Blue Lake

The chart displays monthly precipitation patterns in Blue Lake, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2432311851216627653567152184
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blue Lake

September marks a subtle shift in Blue Lake's humidity patterns as summer gives way to autumn. With a humidity level of 62%, September is notably lower than the heavier months of June and July, where humidity peaked at 79% and 70%, respectively. This drop continues from the even drier August, which recorded just 60%. Despite this decline, humidity levels are set to rise again in October, reaching 72% as the cooler months approach. Overall, September serves as a transitional period, offering a refreshing break from the summer’s sultry embrace while hinting at the dampness that will return with the fall season.

September Average Humidity in Blue Lake

This chart illustrates the average monthly humidity levels in Blue Lake, 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 Blue Lake

As summer fades into fall in Blue Lake, the UV Index remains a significant factor to consider. September experiences a UV Index of 8, placing it in the very high exposure category, similar to the peak summer months. With a burn time of just 15 minutes, the need for sun protection continues as daylight hours shorten. This trend reflects a gradual decrease from the extreme levels seen in June, but caution is still paramount, particularly as sunlight remains strong. As we transition into October, the UV Index dips to 6, indicating a shift towards a high exposure category, allowing for longer safe sun exposure. For more detailed insights on UV levels throughout the year, visit Blue Lake UV Index.

Maximum UV Index Levels in Blue Lake for September

The chart shows the monthly maximum UV Index (UVI) for Blue Lake 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.
JanFebMarAprMayJunJulAugSepOctNovDec3478101110108642
Data source: Blue Lake 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 Blue Lake

In September, Blue Lake basks in a delightful 298 hours of sunshine, signaling the slow transition towards autumn. This month typically follows a peak summer glow, where July boasts a remarkable 399 hours and August holds strong at 361 hours. The gradual decline in daylight is evident, yet September still shines brightly, outpacing many colder months ahead, like October and its 265 hours. This trend of diminishing sunlight reminds us of the seasonal rhythm, inviting reflection on summer's vibrant days while preparing us for the crispness of fall. As the leaves begin to change, the ambiance remains warm and inviting, making September in Blue Lake a perfect blend of lingering summer vibes and the onset of autumn’s charm.

Monthly Sunshine Duration in Blue Lake: September Highlighted

The September sunshine duration represents the total number of hours Blue Lake 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.
JanFebMarAprMayJunJulAugSepOctNovDec111h174h227h262h330h369h399h361h298h265h194h152h
Data source: Blue Lake September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Blue Lake During September

In September, Blue Lake experiences a considerable likelihood of sunny weather, with a 70% chance of sunshine that continues the trend of warmer months. Following the peak summer months of July and August, where sunshine probabilities reach 71% and 76% respectively, September maintains a robust rate of sunny days, marking a slight dip but still promising for outdoor enthusiasts. This seasonal transition reflects the region's enduring warmth, making it an ideal time for enjoying the outdoors before the cooler October temperatures set in, where the chance drops to 45%. Overall, September stands out as a vibrant month filled with plentiful sunshine, encouraging both relaxation and adventure.

Percentage of Sunny Days in September in Blue Lake

The chart illustrates the percentage of sunny days in Blue Lake 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 Blue Lake experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec29%39%52%57%55%58%71%76%70%45%33%30%
Data source: Blue Lake September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Blue Lake in September

As summer fades into fall, September in Blue Lake, United States, marks a gentle transition with daylight lasting approximately 12 hours. This month slightly decreases from the peak of 15 hours during the heights of June and July, reflecting the gradual shortening of days as autumn approaches. Following the vibrant days of summer, September retains a comfortable balance of daylight, bridging the gap between the longer summer days and the upcoming shorter days of October, which will soon dwindle to just 11 hours. This rhythmic ebb and flow of light showcases the region's distinct seasonal cycles and invites reflections on both the beauty and the changes that each month brings.

Average Daylight Hours in Blue Lake for September

The chart illustrates the variation in daylight duration in Blue Lake throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 36m10h 39m11h 58m13h 20m14h 28m15h 2m14h 44m13h 42m12h 24m11h 3m9h 52m9h 16m
Data source: Blue Lake daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Blue Lake

As summer fades into autumn, September in Blue Lake witnesses a notable shift in wind conditions. The average wind speed drops to 2.2 m/s (5 mph), marking the lowest point for the year, a contrast to the slightly sturdier breezes of the previous months. This gentle wind reflects a transition period, as nature prepares for the cooler days ahead. With a gradual decrease from the spring months, where winds were more robust, September's stillness hints at a time for reflection and quietude, before the brisk October winds pick up once again. The overall trend highlights a gentle ebb and flow of wind patterns, echoing the seasonal changes in this picturesque corner of the United States.

Average September Wind Speed in Blue Lake

The chart displays monthly wind speed patterns in Blue Lake, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.83.63.72.73.32.52.32.42.2 m/s3.12.83.3
Data source: Blue Lake September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Blue Lake Compares to Other Months

The weather in Blue Lake 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 Blue Lake and find detailed weather information for every month.

In September, temperatures range from a mild minimum of 7°C (45°F) to a warm maximum of 31°C (88°F), with an average of 15°C (59°F). The month sees relatively low precipitation, with only 35 mm (1.4 in) over just 3 days, and humidity levels hover around 62%. In contrast, January brings significantly cooler conditions, with temperatures dipping to a minimum of -2°C (29°F) and averaging 8°C (46°F), peaking at 18°C (65°F). This month is much wetter, experiencing 243 mm (9.6 in) of precipitation over 14 days and higher humidity at 86%. For more detailed weather conditions in January, you can check Blue Lake weather in January.

September and February exhibit contrasting weather patterns that reflect the transition between summer and winter. In September, temperatures range from a mild 7°C (45°F) at night to a warm 31°C (88°F) during the day, with an average of 15°C (59°F). The month experiences relatively low precipitation, with only 35 mm (1.4 in) over about 3 days and humidity at 62%. In stark contrast, February brings colder temperatures with a minimum of -3°C (27°F) and a maximum of 20°C (68°F), averaging just 7°C (45°F). This month is much wetter, with significant precipitation of 231 mm (9.1 in) spread over 13 days and higher humidity at 85%. For a detailed look at February conditions, you can visit Blue Lake weather in February.

In September, temperatures are generally warmer, with a minimum of 7°C (45°F) and maximum reaching up to 31°C (88°F), creating a pleasant environment for outdoor activities. The month sees relatively low precipitation, averaging just 35 mm (1.4 in) over about three days, with humidity levels around 62%. In contrast, March experiences cooler temperatures, with a minimum of -1°C (31°F) and an average of 8°C (46°F), peaking at 18°C (64°F). This month is significantly wetter, receiving 185 mm (7.3 in) of rain spread across 16 days, contributing to a higher humidity level of 85%. For a more detailed look at March weather in a specific location, you can check Blue Lake weather in March.

In September, the weather tends to be warmer with temperatures ranging from a minimum of 7°C (45°F) to a maximum of 31°C (88°F), averaging around 15°C (59°F). The month sees relatively low precipitation, with only 35 mm (1.4 in) falling over about three days, and humidity levels sit at a comfortable 62%. In contrast, April is cooler, with temperatures fluctuating between a minimum of 2°C (35°F) and a maximum of 20°C (69°F), averaging just 10°C (49°F). This month experiences significantly higher precipitation at 121 mm (4.7 in) over approximately ten days, accompanied by increased humidity levels at 82%. For more detailed information, you can check Blue Lake weather in April.

September and May present contrasting weather patterns. In September, temperatures range from a mild 7°C (45°F) at night to a warm 31°C (88°F) during the day, with an average temperature of 15°C (59°F). The month experiences relatively low precipitation, totaling 35 mm (1.4 in) over just three days, with humidity around 62%. In contrast, May features cooler temperatures, with a minimum of 3°C (37°F) and a maximum of 21°C (71°F), averaging 11°C (52°F). This month is also wetter, receiving 66 mm (2.6 in) of rain over six days and exhibiting higher humidity levels at 81%. For more detailed insights, you can check Blue Lake weather in May.

In comparing the weather between September and June, September tends to be warmer overall, with average temperatures reaching up to 15°C (59°F) and a maximum of 31°C (88°F), while June has a slightly cooler average of 14°C (57°F) and a maximum of 27°C (81°F). Both months experience a similar level of precipitation, with September averaging 35 mm (1.4 in) and June at 27 mm (1.1 in), each seeing precipitation for about three days. However, June has a higher humidity level at 79%, compared to September’s 62%. For a closer look at June weather specifics, you can visit Blue Lake weather in June.

When comparing the weather in September and July, it’s evident that September tends to be warmer overall, with maximum temperatures reaching up to 31°C (88°F) compared to July's 24°C (75°F). Both months have similar average temperatures at 15°C (59°F), but September experiences a wider temperature range. Precipitation is significantly higher in September, with 35 mm spread over three days, while July sees very little rain at just 6 mm and no rainy days at all. Additionally, the humidity in July is slightly higher at 70%, compared to 62% in September, making July feel a bit more muggy. For more specifics on July's weather, you can check out Blue Lake weather in July.

In comparing the weather between August and September, September tends to be warmer overall with average temperatures peaking at 15°C (59°F) and reaching a maximum of 31°C (88°F), compared to August's more moderate maximum of 27°C (81°F). Notably, September experiences slightly cooler minimum temperatures at 7°C (45°F) versus August's 9°C (48°F). Additionally, September sees increased precipitation with 35 mm (1.4 in) spread over 3 days, unlike August, which recorded only 5 mm (0.2 in) with no rainfall days. Humidity levels remain quite similar, with September at 62% and August at 60%. For more details on August weather, you can refer to Blue Lake weather in August.

As September transitions into October, the weather becomes noticeably cooler and wetter. In September, temperatures ranged from a minimum of 7°C (45°F) to a maximum of 31°C (88°F), with an average of 15°C (59°F) and only 35 mm (1.4 in) of precipitation over 3 days. In contrast, October sees a drop in average temperature to 12°C (54°F), with a minimum of 4°C (39°F) and a maximum of 25°C (77°F). The month also brings increased precipitation, totaling 67 mm (2.6 in) over 5 days, and higher humidity levels at 72%. For more details about October weather patterns, you can check out Blue Lake weather in October.

September and November present notable contrasts in weather conditions. September typically enjoys a wider temperature range, with minimum temperatures around 7°C (45°F) and maximums peaking at 31°C (88°F), accompanied by moderate humidity at 62% and relatively low precipitation of 35 mm over just 3 days. In stark contrast, November brings cooler temperatures, with a minimum of -1°C (30°F) and an average of 10°C (49°F), while maximum temperatures rarely exceed 19°C (67°F). This month also sees significantly higher precipitation, totaling 152 mm (6.0 in) over about 10 days, and a marked increase in humidity, reaching 87%. For more detailed weather insights, check out Blue Lake weather in November.

September typically experiences warmer temperatures, with a minimum of 7°C (45°F) and an average of 15°C (59°F), peaking at a maximum of 31°C (88°F). The month sees relatively low precipitation levels at 35 mm (1.4 in), falling over just 3 days, and maintaining a humidity of 62%. In contrast, December brings cooler weather, with temperatures ranging from a minimum of 0°C (33°F) to a maximum of 17°C (63°F) and an average of 7°C (46°F). This month is characterized by significantly higher precipitation at 184 mm (7.2 in) over 13 days, along with increased humidity at 86%. For more details on December weather patterns, check out Blue Lake weather in December.

Compare Blue Lake's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Blue Lake

As September bids farewell to summer, Blue Lake experiences a delightful transition marked by milder temperatures and a noticeable drop in humidity. With maximums reaching a warm 31°C (88°F) but averaging around a comfortable 15°C (59°F), this month offers an inviting mix of warm days and cooler evenings. Rainfall becomes more sporadic, with just a few days of light precipitation totaling 35 mm (1.4 in), allowing for plenty of outdoor adventures amidst the lush scenery. This change in climate makes September a wonderful time to explore the beauty of Blue Lake before autumn settles in. For more details, check out Blue Lake Climate.