Last updated: April 22, 2025
In October, Ottawa experiences a tapestry of weather characterized by a maximum temperature peaking at 27°C (81°F), with an average of 9°C (48°F) and a chilly minimum dipping to -6°C (22°F). This month sees a noteworthy total precipitation of 132 mm (5.2 in) over approximately 12 days, contributing to the city's crisp autumn atmosphere. With humidity levels averaging around 83%, the air feels distinctly cool and refreshing, making it an ideal time to enjoy the vibrant fall foliage.
As October rolls into Ottawa, the city's climate begins to transition towards the colder months. Temperatures range from a chilly min of -6°C (22°F) to a comfortable max of 27°C (81°F), highlighting the crispness of autumn while still allowing for mild days. The average temperature settles around 9°C (48°F), suggesting sweater weather and a vibrant display of fall foliage. Compared to the sweltering summer months, October offers a refreshing reprieve, inviting residents and visitors alike to enjoy outdoor activities amidst the stunning scenery. As the days grow shorter and the air turns brisk, Ottawa showcases a transitional beauty that is both vibrant and invigorating.
October in Ottawa sees a significant uptick in precipitation, with an impressive 132 mm (5.2 in) falling over 12 days. This marked increase is not just part of a seasonal shift, but also highlights Ottawa's transition from the drier summer months to the wetter fall. After a relatively mild September with 79 mm, October’s rainfall represents the peak of the monthly averages, suggesting that residents should brace for the onset of winter weather. This trend of intensifying rainfall prepares the city for the colder months ahead, as precipitation levels usually taper off into November and December. The substantial October rainfall not only nourishes the autumn foliage but also reminds inhabitants that the dry days of summer have given way to the refreshing embrace of fall.
As autumn settles in, October brings a notable shift in humidity levels in Ottawa, with an average of 83%. This month's humidity reflects a transition from the drier summer months, where readings dipped to around 67-69% in July and August. While the air becomes crisper, the increased humidity suggests that the lingering warmth of early fall interacts with the cooling temperatures, creating a unique atmospheric blend. Following a gradual peak in the fall, October's figures set the stage for the higher levels of moisture in the upcoming winter months, characterized by increased moisture in November and further elevation in December. This pattern indicates a rhythmic dance between seasonal changes, where Ottawa's humidity levels ebb and flow, mirroring the cycles of nature.
As October settles in Ottawa, the UV Index dips to 5—a moderate level of exposure that marks a transition from the high summer months. This decrease reflects the waning sunlight of fall, where while the sun's rays are still potent enough to warrant caution, the risk of burns increases to about 30 minutes of unprotected exposure. Compared to the preceding summer months, where indices hovered between 8 and 9, October invites residents to enjoy the beautiful autumn foliage, though they should still consider using sunscreen during outdoor activities. This adjustment is part of a broader trend throughout the year, where UV exposure peaks in late spring and summer before gradually declining into the cooler months. For more information on UV levels throughout the year, visit Ottawa UV Index.
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As October unfolds in Ottawa, the city basks in a warm glow of 190 sunshine hours, a delightful shift that marks the transition from the sun-drenched days of summer to the crisp beginnings of fall. After the summer peak in July, which boasted an impressive 348 hours, the sunlight begins to wane but still holds a generous presence compared to the darker winter months ahead. This month mirrors the patterns of September, which enjoyed 267 hours, indicating a steady decline as winter approaches. With every sunny day, Ottawans embrace the vibrant autumn foliage, making October not just a month of diminishing light but also a celebration of nature’s stunning transformation. The contrast between the bright, sunny moments of October and the forthcoming months serves as a reminder of the seasonal shifts, inviting residents to relish the scenic beauty that this time of year brings.
In Ottawa, the likelihood of sunny weather in October tends to be a bit of a downshift compared to the more sun-drenched summer months. With a 29% chance of sunshine, October presents a notable cooling trend, as the city transitions from the vibrant shades of fall to the grayer days of winter. This marks a dip from September's 39% and aligns closely with the gloomy forecasts typical of early winter months like November, which boasts a 40% chance of sun. As the leaves fall and temperatures cool, Ottawans can expect October to be a mix of crisp air and intermittent sunshine, perfect for those who enjoy the serene beauty of autumn, albeit with a little less brightness.
As October unfolds in Ottawa, the city experiences a gentle transition in daylight duration, with a total of 10 hours of daylight this month. Following the lush, sun-drenched days of summer, which boast up to 15 hours of sunlight in June and July, October marks the beginning of a gradual decline as the days shorten. The daylight hours steadily reduce from 14 hours in May to a more subdued 10 hours in October, reflecting the inevitable approach of winter. This shift is particularly notable as the vibrant colors of autumn foliage contrast with the waning light, creating a mesmerizing backdrop for the crisp fall air. As the season winds down, Ottawa's residents embrace the cozy charm of shorter days, savoring each precious hour of twilight before November ushers in even less sunlight with just 9 hours.
As October settles in Ottawa, the wind speed gently transitions, averaging 2.8 m/s (6 mph), a slight decrease from the breezier days of early fall. This month mirrors the more subdued gusts we've felt during the summer, particularly August's calm conditions with an average of only 2.4 m/s (5 mph). Interestingly, while September experiences a moderate uptick to 3.0 m/s (7 mph), October's winds hint at the impending chill of winter, nudging back towards the winter averages, which start creeping up again in November. Overall, October presents a serene yet refreshing backdrop, inviting residents to enjoy the autumn foliage amidst a gentle breeze.
The weather in Ottawa changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of October's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Ottawa and find detailed weather information for every month.
October and January present stark contrasts in weather, marked by significant differences in temperature and precipitation. In October, temperatures range from a brisk -6°C (22°F) to a warm 27°C (81°F), with an average of 9°C (48°F) and substantial rainfall of 132 mm (5.2 in) over approximately 12 days. The humidity hovers around 83%, giving the month a cool, crisp feel. Conversely, January is characterized by much colder conditions, with temperatures plummeting to a minimum of -32°C (-26°F) and an average temperature of -9°C (16°F); highs only reach about 10°C (50°F). Precipitation decreases to 76 mm (3.0 in) over 9 days, but the humidity slightly increases to 93%. For more detailed insights, visit Ottawa weather in January.
October and February present stark contrasts in weather conditions. In October, temperatures range from a chilly -6°C (22°F) at night to a warm 27°C (81°F) during the day, with an average temperature of 9°C (48°F). This month experiences about 132 mm (5.2 in) of precipitation over 12 days, coupled with a humidity level of 83%. Conversely, February is much colder, with temperatures dipping to a minimum of -27°C (-16°F) and peaking at 11°C (53°F), averaging -8°C (18°F). Precipitation in February is lower at 81 mm (3.2 in), but the humidity is slightly higher at 93%. For more detailed information on February weather, visit Ottawa weather in February.
When comparing October and March, it’s clear that October tends to be milder and more variable in temperature. In October, temperatures range from a chilly -6°C (22°F) at night to a pleasant 27°C (81°F) during the day, with an average of 9°C (48°F). The month also sees a high level of precipitation, accumulating to 132 mm (5.2 in) over approximately 12 days, with humidity levels at 83%. In contrast, March is much colder, starting with minimum temperatures plummeting to -24°C (-12°F) and averaging -3°C (27°F). Despite having a maximum of 20°C (69°F), which is noteworthy, March has less overall precipitation at 87 mm (3.4 in) and similar humidity of 86% over the same number of rainy days. For a detailed look at weather patterns during this month, you can visit Ottawa weather in March.
In comparing the weather of October and April, both months exhibit a wide temperature range, with maximum highs reaching 27°C (81°F) in both cases. However, October typically enjoys a milder average temperature of 9°C (48°F), while April's average is cooler at 5°C (42°F). Precipitation levels are relatively similar, with October receiving 132 mm (5.2 in) and April slightly less at 112 mm (4.4 in), both spread over 12 days. Humidity levels are also comparable, with October slightly higher at 83% compared to April's 82%. For more details about April weather specifically, you can refer to Ottawa weather in April.
October and May present contrasting weather patterns in terms of temperature and moisture. In October, temperatures range from a chilly minimum of -6°C (22°F) to a pleasant average of 9°C (48°F), peaking at 27°C (81°F). This month also experiences significant rainfall, with 132 mm (5.2 in) of precipitation over approximately 12 days and a high humidity level of 83%. In comparison, May offers a milder climate, characterized by minimum temperatures of -3°C (26°F) and an average of 13°C (56°F), reaching a maximum of 35°C (95°F). There is slightly less precipitation at 117 mm (4.6 in) over 14 days, alongside lower humidity at 75%. For more details, you can explore Ottawa weather in May.
October and June present distinct weather patterns in Ottawa. October features colder temperatures, ranging from a minimum of -6°C (22°F) to a maximum of 27°C (81°F), with an average temperature of 9°C (48°F). The month also experiences higher humidity at 83%, accompanied by 132 mm (5.2 in) of precipitation over 12 days. In contrast, June is significantly warmer, with temperatures fluctuating between 2°C (36°F) and 32°C (91°F), averaging 18°C (65°F). It has less humidity at 68% and a slightly lower total precipitation of 98 mm (3.9 in) across 13 days. For a detailed look at the weather specifics in June, you can check Ottawa weather in June.
In comparing the weather between October and July, October generally presents cooler temperatures, with an average of 9°C (48°F) compared to July's warmer 21°C (70°F). July boasts maximum highs reaching up to 35°C (96°F), while October's temperatures peak at 27°C (81°F). Additionally, October experiences more precipitation, totaling 132 mm (5.2 in) over 12 days, slightly higher than July's 114 mm (4.5 in) during the same number of days. The humidity is also noticeably higher in October at 83%, compared to July's 69%. For a detailed look at July's climate, refer to Ottawa weather in July.
In October, the weather shows a significant shift compared to August, with average temperatures dropping from 20°C (68°F) in August to a cooler 9°C (48°F) in October. The maximum temperatures also decline, peaking at 27°C (81°F) in October compared to a warmer 32°C (89°F) in August. Additionally, October experiences more precipitation, with 132 mm (5.2 in) over 12 days, contrasting with August’s 94 mm (3.7 in) over 13 days. Humidity levels are higher in October at 83%, compared to 67% in August, contributing to a noticeably cooler and damper atmosphere as the season transitions into fall. For more detailed information on August weather, you can check Ottawa weather in August.
October weather shows a noticeable shift from September, marked by cooler temperatures and increased precipitation. The minimum temperature in October can drop to -6°C (22°F), while September experiences a milder minimum of 0°C (31°F). Average temperatures also decline from a comfortable 15°C (60°F) in September to a chillier 9°C (48°F) in October. Additionally, October sees higher precipitation levels of 132 mm (5.2 in) over 12 days compared to September's 79 mm (3.1 in) over 11 days, contributing to a more humid environment with 83% humidity compared to September's 72%. For more details on September's weather, you can explore Ottawa weather in September.
October and November display a distinct shift in weather characteristics. October sees a wider temperature range with minimums around -6°C (22°F) and maximums reaching up to 27°C (81°F), resulting in an average of 9°C (48°F). In contrast, November experiences colder conditions, with temperatures plummeting to a minimum of -19°C (-2°F) and an average of 0°C (33°F), while the maximum temperature is significantly lower at 22°C (71°F). Precipitation is relatively high in both months, but October has more rainfall at 132 mm (5.2 in) over 12 days compared to November’s 97 mm (3.8 in) over 14 days. Humidity increases slightly in November to 88%, up from October's 83%. For a deeper look into the specifics of November weather, visit Ottawa weather in November.
October and December offer strikingly different weather experiences. In October, temperatures can range from a mild 9°C (48°F) on average to a warm high of 27°C (81°F), with a minimum dipping to -6°C (22°F). The month sees significant precipitation of 132 mm (5.2 in) over about 12 days, accompanied by humidity levels around 83%. In contrast, December brings a much colder climate, with average temperatures dropping to -5°C (22°F), a maximum of 14°C (58°F), and a chilling minimum of -29°C (-20°F). Precipitation decreases to 80 mm (3.2 in) over the same number of days, while humidity rises slightly to 89%. For more information, check Ottawa weather in December.
As October sweeps into Ottawa, the weather transforms dramatically, presenting a unique blend of crisp chill and fleeting warmth. This month marks a transition from the warm embrace of summer to the briskness of winter, with temperatures dipping into the low single digits at night and only occasionally reaching the milder highs of late summer. Rainfall becomes more frequent, contributing to the month’s overall humidity, which hovers around a notable 83%. This prevalence of precipitation and cooler temperatures distinguishes October from the preceding months, offering a vivid palette of autumn colors and a refreshing chill in the air. For a deeper understanding of how Ottawa's climate unfolds throughout the year, visit Ottawa Climate.