Last updated: August 21, 2025
In September, Rey, Iran experiences a warm climate marked by a maximum temperature soaring to 39°C (102°F), with an average of 27°C (80°F) and a minimum of 16°C (61°F). This month showcases a dry spell, receiving a mere 1 mm (0.0 in) of precipitation over 0 days, making it ideal for outdoor activities. With a humidity level of 45%, the weather maintains a relatively comfortable feel amidst the warmth, inviting residents and visitors alike to enjoy the vibrant Iranian landscape.
In September, Rey, Iran, experiences a notable transition as the summer heat begins to wane. With minimum temperatures around 16°C (61°F) and averages reaching 27°C (80°F), the warmth remains palpable, but the extremes of summer ease, culminating in a maximum of 39°C (102°F). This month marks a shift from the sweltering peak of July and August, where temperatures soared above 40°C (104°F), offering a reprieve for locals and visitors alike. As the month progresses, the refreshing changes in temperature hint at the upcoming autumn, setting the stage for cooler days in October. Overall, September serves as a bridge, blending the warmth of summer with the refreshing onset of fall, making it an attractive time to explore the vibrant landscapes of Rey.
In September, Rey, Iran, typically experiences an arid shift as summer wanes, with recorded precipitation plummeting to a mere 1 mm (0.0 in), marking one of the driest months of the year. This stark contrast follows a summer where August brought no rainfall at all, culminating in a dry spell that lasts until the onset of autumn. With 0 precipitation days, the city remains parched and unrelenting in its heat, accentuating a seasonal pattern where the abundance of rain in earlier months—from 53 mm in February to 50 mm in April—gives way to a swift decline. As October approaches, however, the rain returns, hinting at a rejuvenating change after the prolonged dry period.
In September, Rey, Iran, experiences a notable shift in humidity, with levels dropping to 45%—the second lowest of the year. This decrease follows the substantial decline seen throughout the summer months, where July and August boasted even lower humidity rates of 52% and 40%, respectively. As the summer heat subsides, September marks a transition toward the wetter autumn months, with humidity beginning to climb again, reaching 61% by October. Overall, this pattern reflects a significant seasonal change, as Rey's air becomes more humid in the lead-up to winter, restoring moisture lost during the arid summer.
As September rolls into Rey, Iran, the UV Index maintains a very high rating of 10, similar to the previous month, August. This consistency indicates that while summer is fading, the risk of overexposure to UV radiation remains significant. With a burn time of just 15 minutes, it’s essential to take precautions if you’re spending time outdoors. This month marks a transition towards lower UV levels, as the indices will gradually decline leading into October. It's a reminder for residents and visitors alike to stay vigilant and protect their skin even as the seasons change. For more detailed information, check out the Rey UV Index.
UV Risk Categories
As summer gracefully transitions into autumn, September in Rey, Iran continues to bask in a generous 342 hours of sunshine. This month signals a slight dip from the sun-soaked heights of July and June, which boast the highest sun exposure of the year. Notably, after a vibrant summer, September settles just below the peak months, marking a beautiful equilibrium as the temperatures begin to cool. The overall trend reveals a consistent pattern of increasing sunlight hours from January through July, tapering off gently into the fall. This enchanting blend of warm days and clear skies invites visitors and locals alike to savor the lingering summer while ushering in the crispness of autumn.
In Rey, Iran, September boasts an impressive 99% chance of sunny weather, making it one of the sunniest months of the year. This remarkable likelihood follows a summer filled with near-perfect conditions, as July and August also shine with high probabilities of sunshine at 90% and 93%, respectively. The trend clearly indicates that as the year progresses, especially from June onwards, the likelihood of sunny days soars, peaking in September. With such favorable conditions, this month is an ideal time for outdoor activities and exploration, marking a delightful transition before autumn arrives.
In Rey, Iran, the rhythm of daylight evolves throughout the year, showcasing a clear seasonal dance. Starting in September, the length of daylight measures at 12 hours, a gentle decline from the vibrant days of summer. Following the peak of 14 hours in both June and July, daylight gradually recedes, leading into the shorter days of autumn. As the month progresses, daylight shifts towards the shorter durations observed in October and November, where daylight drops to 11 and 10 hours, respectively. This trend highlights a transition from the long, sun-soaked days of summer, inviting a cooler, more introspective atmosphere as the year winds down.
In September, the winds of Rey, Iran, gracefully shift into a gentle breeze, averaging around 2.4 m/s (5 mph). This marks a subtle increase from the previous months, aligning with the seasonal transition that heralds the harvest period. Notably, the wind speeds in June and September are relatively consistent, both hovering around the same mark, suggesting a calming consistency in nature as summer gives way to autumn. As the year progresses into the cooler months, the winds will gradually taper off, dipping to 1.9 m/s (4 mph) in October and continuing a downward trend into winter, underscoring the serene yet dynamic rhythm of Rey’s climate.
Weather in Rey varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rey, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present strikingly different weather conditions. In September, the temperatures are warm, with an average reaching a pleasant 27°C (80°F) and highs soaring up to 39°C (102°F). This month is characterized by minimal precipitation, recorded at just 1 mm, and a relatively low humidity of 45%. In contrast, January brings a dramatic shift, with average temperatures dropping to a chilly 4°C (40°F) and nightly lows plummeting to -12°C (11°F). The winter month also experiences more precipitation, totaling 34 mm over six days, accompanied by a higher humidity level of 70%. For a detailed outlook on the weather in January, check out Rey weather in January.
September and February present starkly contrasting weather conditions. During September, temperatures soar, ranging from a minimum of 16°C (61°F) to a scorching maximum of 39°C (102°F), with an average of 27°C (80°F). This month boasts dry weather, with negligible precipitation and low humidity at 45%. In contrast, February showcases a chilly climate, with temperatures dipping as low as -15°C (6°F) and averaging just 6°C (44°F), peaking at 19°C (67°F). Additionally, February is significantly wetter, receiving 53 mm (2.1 in) of precipitation over nine days, and the humidity rises to 66%. For a more detailed look at February weather, check out Rey weather in February.
In September, the weather is characterized by warm temperatures, with a minimum of 16°C (61°F) and an average high of 27°C (80°F), peaking at a scorching 39°C (102°F). This month sees virtually no precipitation, with humidity at a comfortable 45%. In contrast, March brings a significant shift as temperatures drop, exhibiting a minimum of -1°C (31°F) and an average of 12°C (53°F), with highs reaching 29°C (85°F). This month experiences more rain, accumulating 48 mm (1.9 in) over 8 days and has a higher humidity level of 68%. For more details on conditions during this transitional month, check out Rey weather in March.
In comparing the weather of September and April, September stands out for its warmer temperatures, with averages around 27°C (80°F) and highs reaching up to 39°C (102°F). It experiences very little precipitation, with only 1 mm recorded and no rainy days, combined with a lower humidity of 45%. In contrast, April sees much cooler temperatures, with averages at 17°C (64°F) and maximums of 32°C (91°F). This month is also marked by significantly higher humidity at 62% and a total of 50 mm of rainfall spread over 8 days, indicating a wetter climate. For a detailed look at the weather in Rey during April, you can check Rey weather in April.
In September, temperatures are notably warmer, with an average of 27°C (80°F) and highs reaching up to 39°C (102°F). The month is characterized by minimal precipitation, averaging just 1 mm and experiencing no rainy days, along with a relatively low humidity of 45%. In contrast, May presents a cooler climate, with temperatures ranging from a minimum of 10°C (50°F) to an average of 23°C (74°F) and maximums of 38°C (100°F). However, May tends to be wetter, receiving about 19 mm of rain over three days, and features higher humidity levels at 64%. For a more detailed look at May weather in the region, check out Rey weather in May.
When comparing the weather in September and June, we see that June tends to be slightly warmer on average, with daytime temperatures reaching an average of 30°C (86°F) compared to September's 27°C (80°F). Both months experience high maximum temperatures, with June peaking at 40°C (104°F) and September at 39°C (102°F). Interestingly, both months have minimal precipitation; however, June has a bit more at 2 mm (0.1 in), while September records only 1 mm (0.0 in). Humidity levels are notably higher in June at 62%, compared to September's 45%, contributing to the generally more humid feel in early summer. For more detailed insights, you can check out Rey weather in June.
In comparing the weather between September and July, September offers a slightly milder climate with an average temperature of 27°C (80°F) compared to July's higher average of 33°C (91°F). While September experiences a minimum temperature of 16°C (61°F), July's lowest is 21°C (70°F), indicating that nights in September are cooler. Additionally, both months have minimal precipitation, with September receiving just 1 mm and July slightly more at 2 mm; however, both months report no rainy days. Humidity levels are also different, with July being more humid at 52% compared to September's 45%. For those interested in specifics for July weather, you can refer to Rey weather in July.
In comparing the weather between September and August, September offers slightly cooler temperatures, with a minimum of 16°C (61°F) and an average of 27°C (80°F), compared to August's warmer minimum of 20°C (67°F) and average of 31°C (88°F). August experiences higher maximum temperatures, reaching up to 41°C (107°F), whereas September's maximum is a milder 39°C (102°F). Both months see little to no precipitation, with September recording just 1 mm and 0 days of rain, mirroring August's completely dry spell of 0 mm and 0 days as well. Additionally, humidity levels are comparable, with September at 45% and August slightly lower at 40%. For more detailed weather specifics, you can check Rey weather in August.
September generally offers much warmer temperatures, with a minimum of 16°C (61°F) and an average high reaching up to 39°C (102°F). The month is characterized by dry conditions, evidenced by just 1 mm of precipitation and a humidity level of 45%. In contrast, October sees a significant drop in temperatures, with a minimum of 7°C (45°F) and a maximum of 32°C (91°F). Additionally, this month experiences a rise in precipitation, totaling 20 mm over 4 days, along with an increase in humidity to 61%. For a more detailed look at October weather, you can visit Rey weather in October.
September and November present strikingly different weather patterns. In September, temperatures range from a comfortable minimum of 16°C (61°F) to a scorching maximum of 39°C (102°F), with an average of 27°C (80°F). This month is characterized by dry conditions, with only 1 mm of precipitation and 0 rainy days, alongside relatively low humidity at 45%. In contrast, November experiences a significant drop in temperatures, with minimums reaching 0°C (32°F) and maximums peaking at 26°C (80°F). The average temperature settles at a cooler 11°C (52°F). This month also sees a considerable increase in precipitation, totaling 50 mm (2.0 in) over 7 rainy days, contributing to a higher humidity level of 72%. For a detailed look at what to expect, check out Rey weather in November.
September and December present strikingly different weather conditions. In September, temperatures range from a minimum of 16°C (61°F) to a maximum of 39°C (102°F), with an average of 27°C (80°F) and virtually no precipitation at 1 mm (0.0 in). The humidity is relatively low at 45%, making it a warm and dry month. In contrast, December brings much cooler temperatures, with a minimum of -5°C (24°F) and a maximum of 19°C (67°F), averaging only 6°C (44°F). This month sees a noticeable increase in precipitation at 34 mm (1.3 in) over about 7 days, along with higher humidity levels at 70%, resulting in a much wetter and colder environment. For more details, you can check Rey weather in December.
As summer draws to a close, September in Rey offers a delightful transition with generally mild temperatures, making it an appealing time to experience the area. The average warmth of 27°C allows for comfortable outdoor activities, contrasting sharply with the peak heat of the preceding months. With a strikingly low precipitation rate, this month remains dry and inviting, often resulting in clear skies that enhance the region's natural beauty. Additionally, the humidity level sits at a moderate 45%, contributing to a pleasant atmosphere perfect for exploration. For those curious about Rey's climate throughout the year, visit Rey Climate to gain further insights.