Last updated: August 21, 2025
In October, Si'an, China experiences a delightful transition into autumn, where temperatures range from a comfortable 8°C (47°F) at night to a warm 32°C (90°F) during the day, averaging around 19°C (66°F). This month sees approximately 58 mm (2.3 in) of rainfall spread across seven days, contributing to a 76% humidity level that adds a refreshing touch to the crisp air. Visitors can enjoy the vibrant fall foliage while dressing in layers to adapt to the day-night temperature shifts, making it an ideal time for outdoor activities and exploration.
In October, Si'an, China experiences a shift towards the cooler temperatures of autumn. The month sees a minimum dipping to around 8°C (47°F), while the average temperature stabilizes at a pleasant 19°C (66°F), rising to a maximum of 32°C (90°F). This transition marks a notable drop from the sweltering heights of summer, particularly when compared to the soaring temperatures of July and August. As the leaves begin to change, October provides a comfortable climate that is ideal for outdoor activities, inviting both locals and visitors to enjoy the crisp air and vibrant scenery. The gradual cooling trend reminds us that winter is on the horizon, yet the warm sun still makes a gracious appearance, allowing for those delightful autumn days.
In October, Si'an experiences a notable shift in precipitation, with an average of 58 mm (2.3 in) of rain falling across 7 days. This amount marks a decrease from the heavier rainfall seen in the summer months, particularly July, which averages an impressive 231 mm (9.1 in) over 17 days. As the transition into autumn continues, October's rainfall reflects a moderation as temperatures begin to cool. This trend of diminishing precipitation is mirrored in November as well, with similar amounts, suggesting that Si'an is entering a drier phase before winter. Overall, October serves as a bridge between the wet, lush summer and the drier, cooler months ahead, showcasing nature’s graceful shift in rhythm.
As October settles in Si'an, China, residents experience a noticeable shift in humidity levels, with the month averaging 76%. While this represents a decline from the summer's peak humidity, which reached a sweltering 95% in July and remained high at 92% in August, it still marks a significant increase from the drier winter months. This gradual decrease indicates a transition towards milder conditions, bridging the heavy humidity of the summer with the somewhat drier air that will follow in November, when humidity hovers around 77%. The overall trend across the year reveals a peak in humidity from June through August, gradually receding as autumn progresses, providing a refreshing reprieve for both the locals and visitors alike.
In October, Si'an, China experiences a UV Index of 8, placing it in the very high exposure category. This marks a slight decline from the extreme levels seen in the summer months of July and August, which reached a peak UV Index of 11. Despite the decrease, October still poses significant sun exposure risks, with a burn time of just 15 minutes for unprotected skin. As the year transitions from the sweltering summer to the mild autumn, it’s essential to remain vigilant against UV radiation. With the UV Index gradually diminishing into the colder months, November will see a drop to 6, but the importance of sun protection remains paramount. For detailed information and tips on staying safe under the sun, visit Si'an UV Index.
UV Risk Categories
October in Si'an, China, enjoys a pleasant blend of moderate sunshine, with approximately 246 hours of bright skies. Following the vibrant summer months of August—the peak at 308 hours—and the warm transitions of September with 268 hours, October offers a slight retreat into the softer glow of autumn. This trend reflects a gradual decrease in sunlight as the year winds down, with October still holding its own against the earlier months. While not as sun-drenched as the summer, the golden hues of October create a beautiful backdrop for fall activities, making it a delightful time to explore the city's rich culture and stunning landscapes.
In October, Si'an, China enjoys a 39% chance of sunny weather, placing it in a moderate position compared to other months. The trend shows that as the year progresses, chances of sunshine generally rise after the summer months, which have notably low percentages—dipping to 21% in July. Interestingly, October sits just above the year’s median for sunny days, following closely behind September's 45%. As autumn deepens, residents can look forward to clearer skies before winter arrives, with November and December boasting significantly higher chances of sunshine at 60% and 62% respectively. This gradual shift underscores the seasonal transition, paving the way for brighter days ahead.
In Si'an, China, October marks a transitional phase as daylight begins to wane, illuminating the month with 11 hours of sunlight. Following the summer's peak in June, where daylight reached an impressive 14 hours, the gradual decrease becomes evident as day length recedes through the autumn months. The shift from the abundant light of May and June to October's more modest offering sets the stage for the cooler, darker days of winter. This rhythm of daylight mirrors the seasonal changes experienced in Si'an, enhancing the region's rich tapestry of natural beauty and cultural festivities. As daylight dwindles, the evenings invite cozy gatherings, making October a time of both reflection and connection amidst the changing scenery.
As the autumn breeze sweeps through Si'an, China in October, average wind speeds settle at a gentle 3.5 m/s (8 mph). This marks a slight decline from the summer peak of 4.5 m/s in July but remains consistent with the previous months' trends, where wind speeds hover around the 3.4 to 3.6 m/s range. The mild winds of October create a pleasant atmosphere, as the city transitions into the cooler months, allowing residents and visitors alike to enjoy the crisp air while appreciating the stunning fall foliage. The gradual reduction in wind speed not only signals a change in season but also invites a tranquil ambiance that envelops Si'an, making it an ideal time for leisurely strolls through its picturesque streets.
Weather in Si'an varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Si'an, focusing on differences in temperature, rainfall, humidity, and UV levels.
October and January present stark contrasts in weather patterns. In October, temperatures can range from a mild 8°C (47°F) at night to a warm 32°C (90°F) during the day, with an average of 19°C (66°F). The month also receives about 58 mm (2.3 inches) of precipitation over 7 days, accompanied by relatively high humidity at 76%. Conversely, January is much colder, with temperatures dipping as low as -8°C (17°F) at night and reaching a maximum of 18°C (64°F), averaging just 5°C (41°F). January sees slightly less precipitation, at 47 mm (1.8 inches), over 8 days, with lower humidity levels at 67%. For more details on January weather, you can visit Si'an weather in January.
October and February present contrasting weather patterns, with October enjoying warmer temperatures and higher humidity levels. In October, the average temperature reaches 19°C (66°F), with a comfortable high of 32°C (90°F), while February's average is significantly cooler at 6°C (43°F), peaking at 24°C (75°F). Precipitation is slightly higher in October at 58 mm (2.3 in) across 7 days, compared to February's 52 mm (2.0 in) over 8 days. Humidity is also higher in October, averaging 76%, compared to February's 69%. For more specific details, you can refer to Si'an weather in February.
October and March present distinct weather patterns for Si'an, reflecting changes in temperature and precipitation. In October, temperatures range from a minimum of 8°C (47°F) to a maximum of 32°C (90°F), with an average of 19°C (66°F). This month also experiences 58 mm (2.3 in) of precipitation over approximately 7 days, accompanied by a humidity level of 76%. Conversely, March is cooler, with temperatures starting at 0°C (33°F) and peaking at 27°C (81°F), averaging around 11°C (51°F). Precipitation is slightly lower at 56 mm (2.2 in), occurring over about 9 days, and humidity is higher at 79%. Overall, October tends to be warmer and drier than March. For a deeper insight into March's weather specifics, you can visit Si'an weather in March.
When comparing the weather in October and April, we notice distinct differences in temperature and humidity. October typically features a wider temperature range, with minimums around 8°C (47°F) and maximums reaching up to 32°C (90°F), while averaging at 19°C (66°F). In contrast, April starts cooler with minimums around 4°C (39°F) and averages at 15°C (59°F), with maximums slightly lower at 30°C (87°F). Precipitation levels are also noteworthy; October sees about 58 mm (2.3 in) over 7 days, whereas April records higher precipitation at 70 mm (2.8 in) over 8 days. Additionally, humidity levels are slightly higher in April at 86%, compared to 76% in October. For more detailed insights, you can explore Si'an weather in April.
In October, temperatures range from a minimum of 8°C (47°F) to a maximum of 32°C (90°F), with an average of 19°C (66°F). The month sees about 58 mm (2.3 in) of precipitation over approximately 7 days, accompanied by a relative humidity of 76%. In contrast, May experiences slightly warmer temperatures, with a minimum of 9°C (49°F) and a maximum reaching 35°C (95°F), averaging 21°C (69°F). However, it is also wetter, accumulating 112 mm (4.4 in) of rainfall over 9 days, and with higher humidity at 87%. For more detailed weather information, you can check Si'an weather in May.
When comparing the weather in October and June, there are notable differences in temperature and humidity. October typically experiences a minimum temperature of 8°C (47°F) and can reach a maximum of 32°C (90°F), with an average of 19°C (66°F). In contrast, June brings warmer conditions, with minimum temperatures around 16°C (61°F) and highs soaring up to 37°C (99°F), averaging 24°C (76°F). June also tends to be wetter, with 131 mm (5.2 in) of precipitation over approximately 10 days, compared to October's 58 mm (2.3 in) over 7 days. Additionally, June has higher humidity levels at 90%, while October's humidity rests at 76%. For more detailed information on June weather, check Si'an weather in June.
In comparing the weather of October and July, October offers a more moderate temperature range with a minimum of 8°C (47°F) and an average of 19°C (66°F), peaking at 32°C (90°F). In contrast, July experiences significantly higher temperatures, with a minimum of 18°C (65°F) and an average of 28°C (82°F), reaching maximums of 39°C (103°F). Precipitation also varies greatly between the two months; October sees 58 mm (2.3 in) over 7 days, while July endures much heavier rainfall with 231 mm (9.1 in) across 17 days. Additionally, July's humidity is notably higher at 95%, compared to October's relatively comfortable 76%. For a closer look at the conditions during July, you can explore Si'an weather in July.
In comparing the weather conditions between October and August, October offers a more moderate temperature range, with minimums around 8°C (47°F) and maximums peaking at 32°C (90°F), resulting in a comfortable average of 19°C (66°F). In contrast, August presents much warmer temperatures, with lows of 21°C (71°F) and highs reaching a sweltering 37°C (99°F), yielding a hotter average of 28°C (84°F). Additionally, August experiences significantly more rainfall, accumulating 192 mm (7.6 in) over 14 days, compared to October's 58 mm (2.3 in) over just 7 days. The humidity also tends to be higher in August at 92%, while October has a somewhat lower humidity level of 76%. For a detailed look at weather specifics in August, visit Si'an weather in August.
October's weather presents a notable shift compared to September, marked by cooler temperatures and less rainfall. In October, the minimum temperature dips to 8°C (47°F), with an average of 19°C (66°F) and a maximum reaching 32°C (90°F). In contrast, September starts off warmer, with a minimum of 16°C (61°F), averages at 24°C (76°F), and can peak at 34°C (94°F). Additionally, October experiences significantly less precipitation, totaling 58 mm (2.3 in) over 7 days, while September sees much higher rainfall at 142 mm (5.6 in) across 11 days. Humidity levels remain relatively similar, with October at 76% compared to September's 79%. For a detailed look at September's weather, you can refer to Si'an weather in September.
October generally offers warmer temperatures compared to November, with average highs reaching 32°C (90°F) and lows around 8°C (47°F) while November sees a decrease in temperatures, averaging between 1°C (34°F) and 27°C (81°F). Although both months experience similar levels of precipitation—58 mm (2.3 in) in October and 53 mm (2.1 in) in November—the humidity remains quite consistent at around 76% in October and slightly higher at 77% in November. For a closer look at November's climate, you can visit Si'an weather in November.
October and December present contrasting weather conditions. In October, temperatures range from a mild 8°C (47°F) at night to a warm 32°C (90°F) during the day, with an average of 19°C (66°F). The month experiences moderate precipitation, totaling 58 mm (2.3 in) over about 7 days, along with a relatively high humidity of 76%. In contrast, December brings much cooler temperatures, with a minimum of -7°C (20°F) and a maximum of 20°C (68°F), resulting in a significantly lower average of 7°C (45°F). Precipitation decreases to 44 mm (1.7 in), occurring over 8 days, and humidity drops slightly to 73%. For a deeper insight into the December climate, you can check Si'an weather in December.
As October rolls in, Si'an experiences a delightful transformation in its weather, marking a shift from the heat of summer to more moderate temperatures. The average temperature hovers around a comfortable 19°C (66°F), offering pleasant days and cooler nights, in stark contrast to the higher temperatures of preceding months. While there's a modest amount of precipitation during this time, with about seven rainy days, the humidity remains relatively high at 76%, contributing to a refreshing atmosphere. This month provides a unique blend of autumnal changes, making it an ideal time for outdoor activities. For a deeper understanding of what to expect, explore the comprehensive details at Si'an Climate.