Last updated: February 24, 2025
September in Hannibal, United States, brings a dynamic climate characterized by warm days and cool nights. With maximum temperatures reaching up to 35°C (95°F), residents can enjoy the late-summer heat, while the average temperature hovers around a comfortable 22°C (71°F). Nights cool down, dipping to a refreshing low of 7°C (45°F), creating a pleasant range for outdoor activities. Precipitation is moderate, totaling 85 mm (3.3 in) over approximately 7 days, contributing to the region's lush scenery. The humidity levels sit at a notable 76%, adding a touch of tropical feel to the air. Whether basking in the sunshine or enjoying the fresh breeze after a rain shower, September in Hannibal offers a variety of experiences for all.
As the summer warmth gently transitions into autumn, September in Hannibal, United States, showcases a delightful mix of temperatures. With minimums averaging around 7°C (45°F) and comfortable averages peaking at 22°C (71°F), this month presents a refreshing respite from the hotter months of June and August, which regularly soar to maximums of 35°C (95°F). The summer’s lingering warmth allows for pleasant days, while the crisp evenings hint at the cooler temperatures to come. This shift not only invites residents and visitors to enjoy outdoor activities, but also sets the stage for the vibrant fall foliage that follows. September is undeniably a month of transition, where the lingering summer embrace begins to yield to the cool embrace of autumn.
In September, Hannibal experiences a moderate precipitation amount of 85 mm (3.3 in), falling just short of the summer's totals but aligning closely with the overall trend of increasing rainfall as the year progresses. With rain spread across 7 days, this month typically sees a refreshing shift as autumn approaches, offering a welcome balance after the wetter summer months. Notably, while March and May lead the annual precipitation figures, September’s rainfall contributes to a gradual decline toward the drier months ahead, effectively setting the stage for October’s slightly higher precipitation of 108 mm (4.2 in). This consistent pattern highlights the region's transition from summer abundance to the crispness of fall, enriching the landscape with lush hues and vibrant foliage.
In September, Hannibal, United States, experiences a notable drop in humidity, with levels at 76%, marking the beginning of a transition into drier autumn months. This decline continues the trend observed from the summer, where humidity peaked in June at 83% before gradually tapering off through the latter months. Interestingly, this shift highlights a consistent seasonal pattern, where early fall boasts lower humidity compared to the sweltering summer, providing a refreshing change. Looking further ahead, October maintains this comfortable dryness at 76%, foreshadowing the more humid conditions expected to return in late fall and winter. Overall, September offers a brief respite from the humidity typical of the preceding months, inviting residents and visitors alike to enjoy the milder weather.
September in Hannibal sees a UV Index of 9, categorized as very high, which signals a strong need for sun protection as skin can burn in as little as 15 minutes. This month marks a slight decrease from the peak of summer, where UV exposure reached extreme levels of 11 in June and July. However, as the summer sun begins to wane, September retains a significant level of intensity, reminding residents and visitors alike to stay vigilant against harmful rays. With the changing seasons, it's essential to be aware of these trends and adjust your sun safety practices accordingly. For more insights, check out the detailed Hannibal UV Index.
UV Risk Categories
As the summer days begin to fade, September in Hannibal welcomes 286 hours of sunshine, maintaining a warm embrace that still echoes the peak of summer. This month follows a remarkable streak of sun-soaked days from July and August, which recorded a generous 350 and 330 hours respectively. Although September experiences a slight decline in sunshine compared to its sultry predecessors, it remains robust, outshining the earlier months of the year. This gradual transition into autumn showcases a beautiful balance as daylight gently recedes, paving the way for the rich colors of fall while still offering plenty of bright, sunny moments to enjoy.
In Hannibal, United States, September shines as a standout month for sunny weather, boasting a 67% chance of sunshine. This marks a significant increase from the summer months of July and August, which hover around 46% and 51% respectively. As the seasons change, September transitions away from the unpredictability of spring, where the chance of sun was a modest 48% in April, to a robust likelihood that invites outdoor activities and exploration. This upward trend in sunshine continues as we move into the drier fall months, such as October, which sees a decrease to 39%. Overall, September is the perfect time to soak up the sun in Hannibal before the cooler days of autumn set in.
As summer fades in September, Hannibal experiences a subtle transition with approximately 12 hours of daylight, marking a gentle decline from the season's peak. This month represents a shift toward autumn, as sunlight gradually diminishes after reaching a maximum of 14 hours in June and July. Following the exuberant days of spring and summer, September offers a balanced blend of warm days and refreshing evenings, creating an inviting atmosphere for outdoor activities. With daylight decreasing by just an hour from August, residents enjoy the tail end of prolonged light before facing the shorter days of fall, with November and December bringing back the twilight of 9 hours. This gradual shift in daylight not only signifies a change in season but also invites a beautiful transition in the landscape and lifestyle of Hannibal.
As September rolls into Hannibal, the winds start to pick up slightly, averaging 3.2 m/s (7 mph). This marks a shift from the summer lull, where July and August experienced their lowest winds, averaging just 2.2 m/s (5 mph) and 2.6 m/s (6 mph), respectively. The arrival of fall seems to awaken the breezes, preparing the landscape for the brisk conditions of autumn. Notably, this month’s wind speeds are a refreshing contrast to the calm of the previous summer, hinting at the changing seasons ahead. As we look forward to October, the winds are set to return to a more robust average of 3.5 m/s (8 mph), maintaining a gentle but noticeable presence as the trees begin to don their fall colors.
The weather in Hannibal changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Hannibal and find detailed weather information for every month.
In September, the weather features relatively warm temperatures, with lows around 7°C (45°F) and highs reaching up to 35°C (95°F). The month experiences an average temperature of 22°C (71°F) and sees about 85 mm of precipitation over 7 days, coupled with a humidity level of 76%. In stark contrast, January brings much colder conditions, with temperatures plummeting to a minimum of -26°C (-15°F) and a maximum of 17°C (63°F). The average temperature hovers around -2°C (29°F), accompanied by 65 mm of precipitation over the same number of days, and a higher humidity level of 82%. This dramatic shift highlights the seasonal extremes between these two months. For more details on January weather, check out Hannibal weather in January.
September and February present stark contrasts in weather conditions. September typically enjoys a warm climate, with average temperatures ranging from a cool 7°C (45°F) at night to a hot 35°C (95°F) during the day, accompanied by relatively high humidity at 76% and average precipitation of 85 mm (3.3 in) over about 7 days. In contrast, February is characterized by frigid temperatures, with lows plummeting to -26°C (-15°F) and highs reaching a more moderate 24°C (76°F). This month experiences an average temperature of 0°C (32°F) and slightly lower precipitation at 62 mm (2.4 in) over 9 days, alongside a humidity level of 80%. For more detailed information about February weather, visit Hannibal weather in February.
In September, the weather tends to be warm and pleasant, with average temperatures around 22°C (71°F) and a maximum of 35°C (95°F), accompanied by relatively high humidity at 76%. However, precipitation is moderate, with about 85 mm (3.3 in) falling over approximately 7 days. In stark contrast, March is much cooler, with average temperatures dropping to 7°C (45°F) and nighttime lows reaching as low as -17°C (2°F). March also brings more precipitation, totaling 125 mm (4.9 in) across about 11 days, and the humidity remains high at 80%. For a closer look at March weather specific to Hannibal, you can visit Hannibal weather in March.
In comparing the weather between September and April, September offers much warmer temperatures, with minimums around 7°C and maximums reaching up to 35°C. In contrast, April presents a cooler range, starting from a low of -7°C and peaking at 29°C. While both months experience significant precipitation, April is slightly wetter with 103 mm recorded over 10 days, compared to September's 85 mm over 7 days. Additionally, humidity levels remain high in both months, with April at 80% and September at 76%, creating a generally moist atmosphere. For more detailed insights on April's weather, visit Hannibal weather in April.
In comparing the weather of September and May, we see both months exhibiting similar maximum temperatures of 35°C (95°F), but distinct differences in overall conditions. September typically has a warmer average temperature of 22°C (71°F) compared to May's 19°C (66°F). While September experiences only 85 mm (3.3 in) of precipitation over about 7 days, May is considerably wetter, with 160 mm (6.3 in) of rainfall spread over 15 days. Humidity levels are also slightly higher in May at 82%, compared to September's 76%. Overall, May tends to be a cooler and wetter month, as detailed in this link: Hannibal weather in May.
In comparison to September, June exhibits slightly warmer temperatures with a minimum of 11°C (52°F) and an average of 24°C (76°F), compared to September's minimum of 7°C (45°F) and average of 22°C (71°F). Both months can reach a maximum of 35°C (95°F in September and 96°F in June), but June has more consistent warmth and a higher humidity level at 83% compared to September's 76%. Additionally, June experiences more precipitation, recorded at 119 mm (4.7 in) over 10 days, while September sees 85 mm (3.3 in) across 7 days. For more detailed insights into June weather patterns, refer to Hannibal weather in June.
In comparing the weather of September and July, we observe noticeable differences in temperature and precipitation. September has a broader temperature range, with minimums dropping to 7°C (45°F) and maximums reaching 35°C (95°F), averaging around 22°C (71°F). In contrast, July maintains a warmer average temperature of 26°C (79°F), with minimums at 14°C (58°F) and maximums peaking at 36°C (97°F). Both months experience significant rainfall, with September receiving 85 mm (3.3 in) over 7 days and July slightly higher at 92 mm (3.6 in) over 9 days. Additionally, July tends to be more humid, with levels at 81% compared to September's 76%. For a more detailed look at July weather, you can visit Hannibal weather in July.
In comparing the weather between August and September, September tends to be slightly cooler, with average temperatures ranging from a minimum of 7°C (45°F) to a maximum of 35°C (95°F), compared to August's minimum of 12°C (55°F) and an average maximum of 35°C (96°F). While both months experience similar maximum temperatures, August generally feels warmer overall due to its higher average temperature of 24°C (75°F) versus September's 22°C (71°F). Precipitation is also more abundant in August, with 99 mm (3.9 in) over 10 days, compared to September's 85 mm (3.3 in) spread over 7 days. Humidity levels are fairly close, with September at 76% and August slightly higher at 80%. For a deeper look into August weather, check out Hannibal weather in August.
September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 7°C (45°F) to a maximum of 35°C (95°F), with an average of 22°C (71°F), and the month experiences around 85 mm (3.3 in) of rainfall over 7 days. In contrast, October sees a significant drop in minimum temperatures, dropping to -5°C (24°F), while the average temperature stands at 14°C (57°F) and the maximum reaches 32°C (91°F). Additionally, October receives more rainfall, with a total of 108 mm (4.2 in) spread over 10 days, maintaining the same humidity level of 76%. For more specific details, you can check Hannibal weather in October.
September and November exhibit striking differences in weather patterns. In September, temperatures range from a mild 7°C (45°F) to a warm 35°C (95°F), with an average of 22°C (71°F) and relatively high humidity at 76%. The month sees about 85 mm (3.3 in) of precipitation over approximately 7 days, retaining a late-summer feel. In contrast, November brings a notable drop in temperatures, with minimums plummeting to -14°C (6°F) and an average of only 6°C (43°F). Despite having a maximum temperature of 24°C (75°F), it is significantly cooler overall. November also experiences 60 mm (2.4 in) of rainfall spread across 9 days, accompanied by higher humidity of 85%. For more insights into November weather, you can check Hannibal weather in November.
In September, the weather is warm and variable, with temperatures ranging from a cool 7°C (45°F) at night to a scorching 35°C (95°F) during the day, characterized by an average of 22°C (71°F). Precipitation is relatively high, with 85 mm (3.3 in) falling over about 7 days, and humidity levels hovering around 76%.
Contrastingly, December brings a sharp drop in temperatures, with a minimum of -19°C (-2°F) and an average of just 2°C (37°F). Daytime highs reach a maximum of 23°C (73°F), but this is rare. The month sees less precipitation, totaling 45 mm (1.8 in) across about 6 days, while humidity increases to 86%. For more specific weather conditions during this time, you can refer to Hannibal weather in December.
September in Hannibal marks a distinct transition in the weather, where the sweltering summer heat gives way to milder temperatures and a touch of crispness in the air. With a blend of warm days and cooler nights, this month offers a refreshing reprieve, inviting outdoor adventures while still retaining a hint of summer's lingering warmth. Although September experiences some rainfall, with an average of seven rainy days, the overall humidity remains comfortably high, creating a pleasant atmosphere for exploring the charming town. Visitors can revel in the changing seasons as nature begins to show signs of autumn, making September a unique time to experience Hannibal's climate. For more details, check out Hannibal Climate.