Last updated: August 21, 2025
In September, Niigata, Japan, experiences a dynamic climate, characterized by maximum temperatures reaching 34°C (94°F) and an average of 23°C (74°F). The month witnesses a blend of warm and mild conditions, with nightly lows settling around 16°C (60°F). However, it’s also marked by a significant precipitation total of 158 mm (6.2 in) over approximately 15 days, contributing to a high humidity level of 89%. This combination of warmth and moisture can create a lush, vibrant environment, making September an interesting time to explore Niigata's natural beauty despite the frequent showers.
In September, Niigata transitions from the sweltering heat of summer to the more moderate temperatures of autumn. With minimums around 16°C (60°F) and averages soaring to 23°C (74°F), the city enjoys a pleasant warmth that still allows for outdoor activities. Peak temperatures can reach a tropical 34°C (94°F), echoing the summer heat, yet a sense of crispness starts to permeate the air, hinting at the impending fall. This month marks a distinct shift, as temperatures gradually decline in the following months, leading to more refreshing climates and vibrant autumn hues. As Niigata embraces September, the balance between summer's lingering warmth and autumn's gentle arrival makes for a delightful time to explore the region.
In September, Niigata experiences a notable shift in precipitation with an average rainfall of 158 mm (6.2 in) over 15 days. This month marks a transition as the intense summer rains begin to taper off, featuring a significant decrease compared to the peaks of July and August, which logged 271 mm (10.7 in) and 247 mm (9.7 in) respectively. Despite the drop, September's rainfall contributes to a lush landscape as it precedes the wetter autumn months. This time of year offers a balanced mix of sunny and rainy days, maintaining the region's vibrant greenery while hinting at the approaching cooler days of October, where precipitation slightly increases to 170 mm (6.7 in). Thus, September serves as a bridge between the heavy summer downpours and the more varied climatic conditions of fall, providing a unique charm to Niigata's weather patterns.
As summer fades into autumn, September in Niigata, Japan, showcases a slight decrease in humidity, settling at 89%. This month marks a transition from the peak summer humidity of 92% experienced in July and August, while still retaining a significant level of moisture in the air. The trend reflects a gradual decline from the high summer months, indicating that although the oppressive heat of summer is retreating, the air remains notably humid compared to the drier months of winter ahead. With an average humidity of around 85% in the cooler months, September serves as a reminder of the lingering warmth before the crispness of autumn sets in, highlighting the city's unique climatic nuances.
In September, Niigata experiences a UV Index of 9, indicating a very high level of sun exposure with a burn time of just 15 minutes. This slight decline from the extreme levels seen in July and August suggests that while summer is winding down, the sun remains powerful, urging residents and visitors to take precautions against UV rays. The trend throughout the year shows a gradual increase in UV intensity from the moderate levels in winter months to the extreme highs of summer, peaking in July and August. As autumn approaches, September serves as a reminder that even as the heat begins to fade, sun safety remains crucial. For more detailed information, visit Niigata UV Index.
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As summer gracefully transitions into autumn, September in Niigata, Japan offers a delightful balance of sunshine, boasting 260 hours of bright skies. This month, while experiencing fewer sunlight hours than the peak summer months of July and August, still shines brightly compared to the chill of the impending winter. The overall trend shows a clear increase in sunlight as the year progresses, peaking in the summer before gradually tapering off in the fall and winter months. This delightful September warmth serves as a lovely farewell to the summer season, as the vibrant landscapes of Niigata begin to don their autumn hues, inviting residents and visitors alike to revel in the beauty of nature illuminated by the sun.
As September arrives in Niigata, Japan, the anticipation of sunny weather increases significantly, with a notable 46% chance of sunshine. This marks a peak in sunny days for the year, tying with July for the highest percentage. Following the warmer summer months, where July had a modest lead, September offers a delightful transition into autumn, while still retaining a good share of sun. The trend demonstrates that after a dip in sunny days during August (29%), the sun makes a strong comeback, suggesting that September could be an ideal time to enjoy outdoor activities, bask in the mellow warmth, and appreciate the beautiful scenery that Niigata has to offer.
As September arrives in Niigata, Japan, the days begin to shorten, offering approximately 12 hours of daylight. This marks a transition from the long, sun-drenched days of summer, which peaked in June and July with a steady 14 hours of daylight. As the vibrant blooms of late summer start to fade, daylight gradually dwindles from August's 13 hours, leading into the cooler autumn months ahead. The notable decline in daylight from September through the following months hints at the approaching winter, with October further reducing sunlight to 11 hours, evoking a gentle reminder of nature's cyclical rhythm. This gradual fluctuation not only highlights the unique charm of each season but also encourages residents to savor the lingering warmth of early autumn before embracing the cozy embrace of winter.
As September rolls into Niigata, Japan, the wind begins to breathe a gentle sigh, with an average speed of 4.1 m/s (9 mph). This mild increase from the summer months reflects a shift in the seasonal breeze, transitioning from the calmer winds of July and August, which lingered around 2.7 m/s (6 mph) and 3.4 m/s (8 mph), to a more invigorating pace. The freshening winds of early autumn prepare the area for the brisk gusts that follow in October, where speeds tick back up to 4.3 m/s (10 mph). Overall, September's wind captures a harmonious balance—just enough to invigorate the senses while heralding the arrival of the cooler months ahead.
Weather in Niigata varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Niigata, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is characterized by warm temperatures, with a minimum of 16°C (60°F) and an average of 23°C (74°F), peaking at a scorching 34°C (94°F). The month experiences significant rainfall, totaling 158 mm (6.2 in) over approximately 15 days, accompanied by high humidity levels of 89%. In contrast, January plunges into much colder conditions, with temperatures dropping to a minimum of -2°C (28°F) and only reaching an average of 5°C (41°F), while the maximum temperature is a brisk 13°C (55°F). The winter month sees even more rainy days, with 178 mm (7.0 in) of precipitation spread across 23 days, all while maintaining a slightly lower humidity level of 88%. For a closer look at January weather specifics, you can visit Niigata weather in January.
When comparing the weather in September and February, there's a notable contrast in temperature and overall climate. September enjoys warmer conditions with temperatures ranging from a minimum of 16°C (60°F) to a maximum of 34°C (94°F), averaging around 23°C (74°F). Conversely, February is much cooler, with temperatures fluctuating between -1°C (31°F) and a maximum of 15°C (59°F), averaging just 5°C (41°F). Additionally, September experiences heavier precipitation at 158 mm (6.2 in) over 15 days, while February sees slightly less rain at 131 mm (5.1 in), but it occurs over a greater number of days, totaling 24. Both months are characterized by high humidity, but September's humidity is marginally higher at 89%, compared to February's 86%. To learn more about the weather specifics in February, you can check Niigata weather in February.
September and March present stark contrasts in weather patterns. In September, temperatures range from a mild 16°C (60°F) to a maximum of 34°C (94°F), with an average of 23°C (74°F). This month also sees significant precipitation, totaling 158 mm (6.2 in) over 15 days, accompanied by high humidity at 89%. Conversely, March experiences much cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 17°C (64°F), averaging around 8°C (46°F). While it is wetter than September in terms of the number of rainy days, March receives less total precipitation at 112 mm (4.4 in) over 16 days, and the humidity is slightly lower at 81%. For a more detailed look at March weather, visit Niigata weather in March.
When comparing the weather in September and April, notable differences emerge in both temperature and precipitation. September typically boasts warmer temperatures, with averages reaching a comfortable 23°C (74°F) and maximums soaring up to 34°C (94°F). In contrast, April experiences much cooler conditions, with average temperatures around 11°C (52°F) and maximums only reaching 22°C (72°F). Additionally, September is characterized by higher humidity at 89%, compared to April's 78%. Rainfall is also more pronounced in September, with an average of 158 mm (6.2 in) over approximately 15 days, whereas April sees less precipitation at 111 mm (4.4 in) across 14 days. For a closer look at what to expect, you can check out Niigata weather in April.
In September, weather conditions are typically warmer and more humid compared to May. Average temperatures in September range from a mild 16°C (60°F) at night to a scorching high of 34°C (94°F) during the day, while May sees cooler averages, with temperatures fluctuating between 8°C (47°F) and 26°C (79°F). Additionally, September experiences higher precipitation levels, totaling 158 mm (6.2 in) over 15 days, compared to May's 108 mm (4.3 in) over 12 days. Humidity in September is notably higher at 89%, while May enjoys a slightly lower humidity of 81%. For more detailed information, you can check Niigata weather in May.
September and June offer distinct weather experiences, with September typically warmer and more humid. In September, temperatures range from a minimum of 16°C (60°F) to a maximum of 34°C (94°F), averaging around 23°C (74°F), whereas June sees cooler temperatures, with a minimum of 13°C (56°F) and a maximum of 28°C (83°F), averaging 20°C (69°F). Additionally, September experiences higher precipitation levels, with 158 mm (6.2 in) falling over 15 days, compared to June's 100 mm (4.0 in) over 12 days. Both months have similar humidity levels, hovering around 88-89%. For a detailed look at rainfall and temperatures, you can check out Niigata weather in June.
In comparing the weather between July and September, we notice that September has slightly cooler temperatures, with a minimum of 16°C (60°F) and an average of 23°C (74°F), while July begins at a higher minimum of 20°C (68°F) and remains warm with an average of 25°C (78°F). Both months reach a maximum of 34°C (94°F), yet July experiences more rainfall, accumulating 271 mm (10.7 in) over 16 days, compared to September's 158 mm (6.2 in) spread across 15 days. Additionally, humidity levels are marginally higher in July at 92%, compared to September's 89%. For a closer look at July's climatology, check out Niigata weather in July.
In comparing the weather of September and August, we can see some notable differences. September experiences a slight decrease in average temperature, with a minimum of 16°C (60°F), an average of 23°C (74°F), and a maximum of 34°C (94°F), compared to August's warmer minimum of 20°C (68°F), average of 27°C (81°F), and maximum of 35°C (95°F). Additionally, September has less precipitation, totaling 158 mm (6.2 in) over 15 days, while August has significantly higher rainfall at 247 mm (9.7 in) over the same number of days. Humidity remains high in both months, with September at 89% and August slightly higher at 92%. For more detailed insights on August weather, you can check Niigata weather in August.
In comparing the weather between September and October, we see a noticeable drop in temperatures. September boasts a minimum of 16°C (60°F) and an average of 23°C (74°F), reaching maximums of 34°C (94°F). In contrast, October's temperatures decline, with a minimum of 12°C (53°F) and an average of 18°C (65°F), peaking at 28°C (82°F). Both months experience significant precipitation, with September receiving 158 mm (6.2 in) over 15 days, while October sees a slightly higher total of 170 mm (6.7 in) across 16 days. Humidity remains relatively high in both months, though it drops slightly from 89% in September to 87% in October. For a more detailed overview, check out Niigata weather in October.
September and November present contrasting weather patterns. In September, temperatures are significantly warmer, with a minimum of 16°C (60°F) and an average of 23°C (74°F), making it a more comfortable time for outdoor activities. The maximum temperature can soar to 34°C (94°F), but the month is also characterized by high humidity (89%) and substantial precipitation of 158 mm (6.2 in) over 15 days. In contrast, November brings a notable drop in temperatures, with a minimum of 4°C (39°F) and an average of 13°C (55°F), peaking at 21°C (70°F). Although November sees a similar amount of precipitation at 161 mm (6.3 in), it experiences 20 days with rainfall, contributing to slightly lower humidity levels at 85%. For more insights on the weather during this month, you can explore Niigata weather in November.
September and December present markedly different weather patterns. In September, temperatures range from a minimum of 16°C (60°F) to a maximum of 34°C (94°F), with an average of 23°C (74°F). The month is characterized by high humidity at 89% and significant precipitation totaling 158 mm (6.2 in) over 15 days. In contrast, December sees much cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 18°C (65°F), averaging just 7°C (45°F). This month experiences even more rainfall, reaching 226 mm (8.9 in) over 27 days, while humidity remains relatively high at 86%. For more detailed information on December weather, visit Niigata weather in December.
As September rolls in, Niigata experiences a distinct shift in weather compared to the summer months. The temperatures remain comfortably warm, with an average around 23°C, but the maximum can soar to 34°C, making it one of the last hurrahs of heat before autumn takes hold. This month also marks a significant increase in precipitation, with about 158 mm falling over 15 days, leading to a noticeable surge in humidity, which can climb to an average of 89%. The combination of warmth and moisture creates a lush environment, reflecting the transition to the wetter season. To explore more about the climate patterns in this vibrant city, check out Niigata Climate.