Last updated: August 21, 2025
In September, Zanjan, Iran, experiences a delightful transition into autumn, with temperatures ranging from a maximum of 35°C (95°F) to a cool average of 18°C (65°F), dipping as low as 4°C (39°F) at night. This month typically sees minimal rainfall, with only 8 mm (0.3 in) recorded over just one day, leading to a humidity level of 58%. The pleasant weather makes September an ideal time to explore the scenic beauty and rich culture of this vibrant region.
As September arrives in Zanjan, Iran, temperatures begin to shift noticeably from the sweltering summer heat to a more moderate fall ambiance. The average temperature settles at a comfortable 18°C (65°F), with nightly lows dipping to 4°C (39°F), signaling the transition into cooler evenings. Daytime highs can still reach a warm 35°C (95°F), reflecting the tail end of summer's warmth. This month serves as a vivid reminder of nature’s rhythm, where the lingering heat gradually gives way to the crispness of autumn, inviting both residents and travelers to embrace the changing season.
In September, Zanjan experiences a notable shift towards drier conditions, with only 8 mm (0.3 in) of precipitation recorded—similar to August's meager total. This marked reduction in rainfall is reflected in the just one day of precipitation, standing in stark contrast to the wetter months preceding it. The trend showcases a decline in both total rainfall and the number of rainy days as summer transitions into autumn, highlighting Zanjan's characteristic dry spell. As the landscape prepares for the cooler months ahead, this brief dry period sets the stage for the autumn rains that typically follow in October.
In Zanjan, Iran, September brings a noticeable increase in humidity, settling at 58%. This marks a shift from the summer months, where temperatures coincide with lower humidity levels, peaking at only 49% in August. As the year progresses, humidity generally fluctuates, peaking in the winter months of January and February at 75% and gradually decreasing to a summer low of 61% in July. Interestingly, September serves as a transitional month, bridging the drier late summer and the wetter autumn, setting the stage for a rise in moisture levels as the temperatures begin to cool in October. This cyclical pattern underscores the distinct seasonal influences on Zanjan's climate, showcasing the interplay between temperature and humidity throughout the year.
In September, Zanjan experiences a UV Index of 10, placing it in the very high exposure category with a burn time of just 15 minutes. This marks a slight decrease from the peak of 13 in May, signaling the tail end of the extreme index months but still requiring caution during outdoor activities. The trend throughout the year shows a consistent rise from a moderate index of 5 in January to the extremes of 12 in July and August, before tapering slightly in the fall. With a UV Index that remains notably high, it's essential to stay protected as the sun's rays continue to pose risks. For more detailed information on UV conditions throughout the year, visit Zanjan UV Index.
UV Risk Categories
In September, Zanjan basks in a generous 340 hours of sunshine, a delightful continuation of the warm trends evident throughout the summer months. Following the peak of 401 hours in June, the sunlight gradually diminishes but remains robust, outshining both the spring and winter months significantly. This balance in daylight offers a picturesque backdrop for autumn’s onset, as the glow of September subtly transitions into the crispness of October, which enjoys 305 hours of sunshine. The overall trend reveals that Zanjan experiences a vibrant play of light throughout the year, with summer’s warmth gently giving way to fall’s serene charm.
In Zanjan, Iran, the month of September enjoys a notably sunny disposition, with a 75% chance of clear skies. This marks a slight increase from the summer months, showcasing a trend where the likelihood of sunshine gradually diminishes as the year progresses into autumn. Following June, which boasts an impressive 89% chance of sun, July and August also maintain high values at 68% and 74% respectively. However, September stands out as a pocket of warmth before the drop to 55% in October, highlighting its charm as one of the last sunny blooms of the season. With such promising odds for sunlight, September in Zanjan is an ideal time for outdoor activities and enjoying the lingering warmth of summer.
As summer transitions to autumn in Zanjan, Iran, September marks a subtle shift in daylight duration, offering about 12 hours of sunlight each day. This slight decrease follows the peak summer months of June through August, where daylight hours remain consistently high at 14 hours. As the days grow shorter, September serves as a gentle reminder of the impending shift to the cooler months ahead, with daylight gradually tapering off to 11 hours by October. The rhythm of daylight in Zanjan showcases a cyclic pattern throughout the year, where longer days in the spring and summer give way to shorter ones in the fall and winter, embodying the beauty of seasonal change.
In September, Zanjan, Iran experiences a gentle breeze with an average wind speed of 2.8 m/s (6 mph), marking a slight increase compared to the preceding months. This trend of mild winds is consistent throughout the late summer and early autumn, where average speeds remain stable between 2.6 m/s and 3.5 m/s from June to September. Although the wind speed dips slightly in October, the transition from the summer's warmth to the cooler autumn air brings a refreshing quality to the September breeze. Overall, this steady pattern of light winds serves to highlight the region's climatic comfort as seasons shift.
Weather in Zanjan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Zanjan, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present starkly contrasting weather conditions. In September, temperatures can range from a cool 4°C (39°F) to a sweltering 35°C (95°F), with an average of 18°C (65°F). This month experiences minimal rainfall, with just 8 mm spread across only one day and a relative humidity of 58%. In sharp contrast, January brings frigid temperatures, with minimums plummeting to -24°C (-11°F) and an average of -2°C (28°F), peaking at 14°C (58°F). This winter month sees significantly higher precipitation at 42 mm over seven days, along with a higher humidity level of 75%. For a closer look at the January climate, you can visit Zanjan weather in January.
September and February present stark contrasts in weather conditions. September boasts a warm average temperature of 18°C (65°F), with highs reaching up to 35°C (95°F) and minimal precipitation of just 8 mm (0.3 in) over a single day. In contrast, February experiences much colder temperatures, with averages around 0°C (32°F), lows plunging to -23°C (-10°F), and occasional highs of 17°C (64°F). Additionally, February is much wetter, receiving 75 mm (3.0 in) of precipitation spread across about 10 days, along with higher humidity levels at 75%. For more specifics on February weather conditions, visit Zanjan weather in February.
September and March present contrasting weather conditions. In September, temperatures range from a chilly 4°C (39°F) at night to a warm 35°C (95°F) during the day, with an average of 18°C (65°F). The month experiences minimal precipitation, totaling just 8 mm (0.3 in) over a single day, and a humidity level of 58%, making it relatively comfortable. In contrast, March sees much cooler temperatures, with nighttime lows plunging to -11°C (13°F) and daytime highs reaching only 25°C (77°F), averaging around 5°C (42°F). This month is significantly wetter, accumulating 69 mm (2.7 in) of rainfall over 14 days and higher humidity at 72%. For a detailed look at March weather conditions in Zanjan, visit Zanjan weather in March.
September and April present strikingly different weather patterns. September tends to be warmer, with temperatures ranging from a minimum of 4°C (39°F) up to a maximum of 35°C (95°F) and an average temperature of 18°C (65°F). In contrast, April sees much cooler temperatures, from a minimum of -5°C (22°F) to a maximum of 28°C (82°F), averaging around 10°C (50°F). Additionally, September experiences significantly less precipitation, with only 8 mm (0.3 in) over just 1 day, whereas April is much wetter, receiving 92 mm (3.6 in) across 14 days. Humidity levels are also higher in April, averaging 65% compared to September's 58%. For a more detailed look at April's weather, you can visit Zanjan weather in April.
When comparing the weather in September and May, several key differences emerge. September features a broader temperature range, with minimums reaching 4°C (39°F) and maximums soaring to 35°C (95°F), averaging around 18°C (65°F). In contrast, May tends to be cooler, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 32°C (90°F), and an average temperature of 15°C (59°F). Additionally, September experiences significantly less precipitation, averaging only 8 mm (0.3 in) over just one day, while May sees much more rain, totaling 60 mm (2.4 in) across 13 days. Humidity also plays a role, slightly higher in May at 65%, compared to September’s 58%. For more details, you can check Zanjan weather in May.
In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 35°C (95°F), with an average of 18°C (65°F) and relatively low precipitation of 8 mm (0.3 in) over just one day, resulting in a humidity level of 58%. In contrast, June experiences slightly warmer temperatures with a minimum of 7°C (44°F) and a maximum of 36°C (97°F), averaging around 21°C (69°F). The month sees more rainfall, totaling 15 mm (0.6 in) across four days, and features higher humidity at 65%. For more details on the June weather specifics in Zanjan, you can visit Zanjan weather in June.
In comparing the weather of September and July, September features a broader temperature range, with minimums dropping to 4°C (39°F) and maximums reaching up to 35°C (95°F), while July maintains a milder average of 22°C (73°F) and temperatures peaking at 38°C (101°F). Although both months experience relatively low precipitation, September has slightly less with just 8 mm (0.3 in) over one day compared to July's 11 mm (0.4 in) over three days. Humidity levels are also comparable, with September at 58% and July slightly higher at 61%. For a closer look at the specifics, you can check Zanjan weather in July.
The weather in September shows a slight decrease in average temperature compared to August, with September's average at 18°C (65°F) versus August's 21°C (70°F). Minimum temperatures in September are slightly lower at 4°C (39°F), while the maximums are close, with September reaching 35°C (95°F) and August peaking at 36°C (97°F). Both months received similar precipitation, with September registering 8 mm (0.3 in) over 1 day and August maintaining the same amount but over 2 days. Notably, September's humidity is higher at 58%, compared to August’s lower 49%. For more details on August weather, visit Zanjan weather in August.
September and October present a notable shift in weather patterns. September features warmer temperatures, with a minimum of 4°C (39°F) and an average of 18°C (65°F), peaking at a hot 35°C (95°F). It experiences relatively low precipitation, with only 8 mm (0.3 in) over one day and humidity at 58%. In contrast, October brings cooler temperatures, with lows dropping to -2°C (29°F), an average of 12°C (54°F), and a maximum of 28°C (83°F). Additionally, October is much wetter, receiving 37 mm (1.4 in) of rain over seven days, and humidity rises to 73%. For more detailed information on the weather in October, visit Zanjan weather in October.
September and November showcase contrasting weather patterns. In September, temperatures range from a minimum of 4°C (39°F) to a maximum of 35°C (95°F), with an average of 18°C (65°F) and minimal precipitation of only 8 mm (0.3 in) over just a single day. The humidity sits at a comfortable 58%. In stark contrast, November brings significantly cooler conditions, with temperatures dipping as low as -9°C (16°F) and averaging around 5°C (41°F). The maximum temperature reaches 22°C (73°F), but the month is much wetter, experiencing 62 mm (2.5 in) of rainfall across 11 days and higher humidity at 75%. For more insights on November's climate, check out Zanjan weather in November.
The weather in September is markedly warmer than in December, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 35°C (95°F). In contrast, December sees much colder conditions, with temperatures dropping to as low as -13°C (9°F) and averaging around 1°C (34°F). While September experiences a relatively dry climate with only 8 mm (0.3 in) of precipitation on just one day, December is much wetter, recording 49 mm (1.9 in) of rain over nine days. Additionally, humidity levels are higher in December at 72%, compared to 58% in September, adding to the chill of the winter month. For more detailed information, you can check Zanjan weather in December.
As September unfolds in Zanjan, the weather begins to transition into a more moderate climate compared to the sweltering summer months. With temperatures peaking at a comfortable maximum and chilling down to refreshing lows, this month serves as a delightful bridge between the heat of summer and the coming chill of autumn. The minimal precipitation, experienced on just a single day, coupled with a moderate humidity level, creates an inviting atmosphere perfect for outdoor activities. Whether you're exploring the city or soaking in the stunning landscapes, September showcases Zanjan's climate at its most enjoyable. For a deeper dive into the region's overall weather patterns, be sure to check out Zanjan Climate.