Last updated: October 30, 2025
In September, Patna experiences a tropical climate, with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 36°C (98°F). The average temperature hovers around 30°C (86°F), providing a warm atmosphere. This month is marked by significant precipitation, totaling 243 mm (9.6 in) over approximately 23 days, resulting in a high humidity level of 90%. As the monsoon season fades, the city is often characterized by lush greenery and a refreshing ambiance, making it a unique time for both residents and visitors.
In September, Patna transitions into a more comfortable phase as the sweltering summer heat begins to recede. With temperatures ranging from a minimum of 24°C (75°F) to a maximum of 36°C (98°F), this month boasts an average temperature of 30°C (86°F), reflecting a slight dip from the oppressive highs of August. Humidity remains relatively high, but the cooler evenings invite outdoor activities and social gatherings. As the monsoon season approaches its end, the air is often freshened by brief showers, adding a rejuvenating touch to the atmosphere. This month not only marks a shift in the weather but also signals the onset of the more pleasant autumn months ahead.
In September, Patna experiences a significant shift in precipitation, receiving an impressive 243 mm (9.6 in) of rain over 23 days, making it one of the wettest months of the year. This substantial rainfall marks the tail end of the monsoon season, following July and August, which are historically the peak months for rainfall. While July brings a staggering 364 mm (14.3 in), and August follows closely with 308 mm (12.1 in), September's precipitation serves as a bridging point as the monsoon gradually retreats. The consistent number of rainy days hints at a spreading out of rainfall, contrasting with the intense downpours seen earlier in the season. As the month progresses, the abundance of rain sets the stage for the transition into the drier months of October and November, marking a notable decrease in both precipitation and rainy days as the year draws to a close.
September in Patna, India experiences a staggering humidity of 90%, maintaining the high levels seen in the preceding months of July and August. This peak is a continuation of the region's humid monsoon season, where the air is thick and heavy, making it feel even warmer than it is. Following a gradual rise from a low of 29% in April, humidity spikes significantly over the summer months, reflecting the relentless heat and moisture accumulated during the monsoons. As September wraps up the rainy season, this level of humidity indicates the city is still enveloped in moisture, paving the way for a transition into autumn with slightly lower humidity levels in October, yet remaining notably high at 90%. The consistency of such humidity levels throughout these months illustrates Patna's climatic challenges, making it a vital consideration for those living in or visiting the region.
As September rolls into Patna, the UV Index stands at a striking 12, categorizing it as extreme and marking a continuation of the intense sun exposure seen in the preceding months. With only 10 minutes considered safe for sun exposure, it's crucial for residents and visitors alike to take protective measures against harmful rays. This month contributes to a clear upward trend seen from June through September, where UV levels consistently spike, prompting a vigilant approach to sun safety. As we transition into October with a slight dip to an index of 9, the pattern of high UV exposure during the summer months remains notable, reinforcing the importance of being sun-smart year-round. For more information on UV levels throughout the year, check out Patna UV Index.
UV Risk Categories
In Patna, September ushers in a gentle transition, with 287 hours of sunshine that mirrors the tapering warmth of summer. Following the peak brightness of May, which boasts an impressive 355 hours, the sun begins to soften its glow, signaling the onset of autumn. As the sweltering heat of the preceding months gives way to more moderate temperatures, the light hours in September slightly dip from August's 288 hours. This gradual reduction continues into October with 299 hours, illustrating a steady shift in the rhythm of the seasons. The city's balance of sunshine serves as a backdrop for vibrant festivals and lush landscapes, making it a splendid time to embrace the outdoors and enjoy the lingering warmth.
In Patna, September marks a noticeable shift in weather patterns, as the chance of sunny days drops to just 25%. Following the sweltering summer months, when the likelihood of sunshine significantly wanes—reaching a mere 11% in July and 8% in August—September begins to hint at a transitional phase. Although the sun does occasionally break through the clouds, the chances are much lower compared to earlier months like February and March, which boast a striking 89% chance of clear skies. As the monsoon recedes and the month progresses, residents can expect a mix of cloudy days and intermittent sunshine, setting the stage for the more reliable sun-filled months of October and November.
In September, Patna enjoys a balanced 12 hours of daylight, maintaining the daylight duration characteristic of the preceding months of April through August. This period marks a gentle transition as the longer days of summer wane, yet sunlight remains generous enough to foster a vibrant atmosphere. As the city moves into October and the daylight dips to 11 hours, the gradual shortening of days signals the onset of autumn. The overall pattern reveals a rhythm of steadily increasing daylight from January through June, culminating in the summer months, before transitioning back in a symmetrical flow towards winter with gradual decreases in October and beyond.
As September unfolds in Patna, the winds begin to pick up, reaching an average speed of 3.2 m/s (7 mph)—the highest of the year. This uptick in wind intensity signifies a noticeable shift as the city transitions from the monsoon's heavy rains to the inviting embrace of autumn. After the moderate winds of the preceding months, September breathes life into the surroundings, invigorating the air with a refreshing breeze that hints at the change of seasons. Interestingly, this increase follows a gradual decline from the previous peaks in May and June, where winds hovered around 3.1 m/s (7 mph) and 3.0 m/s (7 mph) respectively. As the month progresses, Patna's atmosphere becomes increasingly dynamic, creating a delightful backdrop for those savoring the transition from the sultry summer to the more temperate days ahead.
Weather in Patna varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Patna, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, temperatures soar with a minimum of 24°C (75°F) and an average high of 30°C (86°F), reaching up to a scorching 36°C (98°F). This month is also characterized by high humidity at 90% and significant rainfall, totaling 243 mm (9.6 in) over 23 days. In stark contrast, January offers a much cooler climate, with temperatures ranging from a chilly minimum of 5°C (42°F) to a comfortable average of 15°C (60°F) and a maximum of 28°C (82°F). The precipitation is minimal in January, with only 10 mm (0.4 in) recorded over just 2 days and a lower humidity level of 72%. For more detailed insights on January weather in Patna, you can visit Patna weather in January.
September and February present stark contrasts in weather conditions. In September, temperatures range from a minimum of 24°C (75°F) to a maximum of 36°C (98°F), with an average of 30°C (86°F), creating a warm and humid environment, characterized by heavy rainfall of 243 mm (9.6 in) over 23 days and a high humidity level of 90%. In contrast, February features much cooler temperatures, with a minimum of 8°C (47°F) and a maximum of 33°C (92°F), averaging around 19°C (67°F). The month sees significantly less precipitation, only 19 mm (0.7 in) over just 2 days, along with lower humidity at 59%. This makes February a far drier and cooler month compared to the sweltering and wet conditions of September. For more details on February weather, visit Patna weather in February.
September and March present distinct contrasts in weather. September boasts warmer temperatures, with a minimum of 24°C (75°F) and an average high of 36°C (98°F), accompanied by high humidity levels around 90%. However, it also experiences significant rainfall, totaling 243 mm (9.6 in) over 23 days, creating a humid atmosphere. In contrast, March features cooler temperatures, with a minimum of 11°C (52°F) and an average high of 39°C (102°F), but with much less humidity at 45%. Precipitation in March is minimal, with only 13 mm (0.5 in) expected over just 2 days. For more information, check Patna weather in March.
September and April present contrasting weather patterns. In September, the temperatures range from a minimum of 24°C (75°F) to a maximum of 36°C (98°F), with an average of 30°C (86°F). This month is characterized by high humidity at 90% and substantial rainfall, receiving 243 mm (9.6 inches) over 23 days. In sharp contrast, April boasts higher maximum temperatures, peaking at 43°C (109°F) with a minimum of 18°C (64°F), while maintaining the same average temperature of 30°C (86°F). However, April experiences significantly less precipitation, with only 15 mm (0.6 inches) occurring over just 3 days and much lower humidity at 29%. For more details, you can check Patna weather in April.
September and May present contrasting weather patterns. In September, temperatures range from a minimum of 24°C (75°F) to a maximum of 36°C (98°F), accompanied by high humidity levels of 90%. This month experiences significant rainfall, with an average precipitation of 243 mm (9.6 in) spread across 23 days. In contrast, May showcases slightly warmer temperatures, with a minimum of 22°C (71°F) and a maximum soaring to 44°C (111°F). Additionally, May is notably drier, receiving only 65 mm (2.6 in) of precipitation over just 7 days, and features a much lower humidity of 51%. For more detailed information, visit Patna weather in May.
In September, the weather is characterized by slightly lower average temperatures, with a minimum of 24°C (75°F) and an average of 30°C (86°F), compared to June's warmer average of 32°C (90°F) and peak temperatures reaching up to 45°C (113°F). Notably, September experiences more rainfall, totaling 243 mm (9.6 in) over 23 days, while June sees slightly less precipitation at 205 mm (8.1 in) over 16 days. Additionally, September's humidity is higher at 90%, in contrast to the 76% humidity in June. This results in a more tropical feel during September, whereas June tends to be oppressively hot. For more detailed information about June weather, you can refer to Patna weather in June.
When comparing the weather in September and July, we see some distinct differences. September typically has slightly lower temperatures, with a minimum of 24°C (75°F) and a maximum of 36°C (98°F), while July tends to be hotter, with minimums around 26°C (79°F) and maximums reaching up to 40°C (104°F). In terms of precipitation, July is notably wetter, receiving 364 mm (14.3 in) over 27 days, compared to September's 243 mm (9.6 in) over 23 days. Both months experience high humidity, with September at 90% and July slightly higher at 91%. For more detailed information on July weather, check out Patna weather in July.
In comparing the weather conditions of September and August, we see some notable differences despite both months having similar average temperatures. September experiences slightly cooler minimum temperatures at 24°C (75°F) compared to August's 26°C (79°F), but both months share the same average of 30°C (86°F). Additionally, the maximum temperature in August reaches a higher 37°C (98°F), while September peaks at 36°C (98°F). Precipitation levels are also substantial, with September receiving 243 mm (9.6 in) over 23 days, whereas August has a higher total of 308 mm (12.1 in) across 28 days. Notably, humidity remains consistent at 90% for both months, contributing to a distinctly tropical feel. For more detailed weather insights, you can check Patna weather in August.
September and October present a noticeable shift in weather patterns. While September boasts higher temperatures with an average of 30°C (86°F) and peaks reaching 36°C (98°F), October cools down to a comfortable average of 27°C (81°F), with a minimum of 17°C (63°F). Additionally, September experiences significantly more rainfall, accumulating 243 mm (9.6 in) over 23 days, whereas October sees a marked decrease in precipitation, with only 70 mm (2.7 in) falling over just 8 days. Despite both months having a humidity level of 90%, the overall conditions in October are generally drier and cooler, making it a more pleasant time of year. For more details, you can check out Patna weather in October.
September and November present distinctly different weather patterns. In September, temperatures range from a minimum of 24°C (75°F) to a maximum of 36°C (98°F), with an average of 30°C (86°F). This month is characterized by high humidity at 90% and significant rainfall, totaling 243 mm (9.6 in) spread over 23 days. In contrast, November experiences a cooler climate with temperatures dipping to a minimum of 12°C (53°F) and peaking at 33°C (91°F), averaging 22°C (72°F). Remarkably, this month sees no precipitation, resulting in drier conditions and maintaining a slight humidity of 88%. For more detailed information, you can check Patna weather in November.
September weather in Patna is hot and humid, with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 36°C (98°F), and an average temperature of 30°C (86°F). This month is marked by significant rainfall, receiving 243 mm (9.6 in) over 23 days, contributing to a high humidity level of 90%. In contrast, December brings a much cooler climate, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 29°C (85°F), and an average of 17°C (63°F). With significantly reduced precipitation at just 17 mm (0.7 in) occurring over only one day, the humidity also drops slightly to 87%. For more details, you can check Patna weather in December.
As September unfolds in Patna, the weather transitions dramatically from the sweltering summer months. This month brings a blend of warmth and moisture, with temperatures averaging a comfortable 30°C while high humidity levels hover around 90%. The frequent rain, totaling around 243 mm over 23 days, rejuvenates the landscape but can also make the air feel quite heavy. Compared to the intense heat of July and August, September offers a refreshing change, though it still retains a hint of summer's warmth. For more insights on the climate patterns, visit Patna Climate.