Last updated: April 22, 2025
August in Cornwall, Canada, showcases a delightful blend of warmth and humidity, with maximum temperatures soaring to a balmy 30°C (86°F) and a comfortable average of 20°C (68°F). Though sunny days are plentiful, the month also sees 73 mm (2.9 in) of precipitation spread over approximately 10 days, contributing to the region's vibrant summer landscape. With humidity levels sitting at a steamy 87%, visitors can expect a quintessential Canadian summer experience, perfect for outdoor adventures and exploration amidst the beautiful scenery.
In August, Cornwall, Canada, boasts pleasantly warm temperatures that signal the height of summer. With minimums averaging around 11°C (51°F) and highs reaching a balmy 30°C (86°F), the month offers a wonderful escape from the chill that dominates the winter months. The average temperature settles at a comfortable 20°C (68°F), creating ideal conditions for outdoor activities and enjoying the lush landscapes. As August progresses, the warmth serves as a vibrant reminder of the seasonal shift, transitioning toward cooler September days, where temperatures dip to an average of 16°C (61°F). This brief summer warmth juxtaposed with the biting winter cold seen earlier in the year underscores the significant seasonal variation Cornwall experiences.
In August, Cornwall, Canada experiences a moderate precipitation level of 73 mm (2.9 in), showcasing a slight decrease from the wetter months of June and July. With just 10 rainy days this month, the weather tends to be more predictable, allowing residents to enjoy the summer warmth with fewer disruptions. As the region transitions into September, precipitation increases sharply to 96 mm (3.8 in), highlighting a seasonal shift toward the wetter fall months. Overall, August serves as a brief reprieve before the rains return, reflecting Cornwall's characteristic variability in weather patterns throughout the year.
In August, Cornwall, Canada, experiences a notable shift in humidity, peaking at 87%, which marks the highest level of the year. This slight increase follows a trend observed throughout the summer months, where humidity remains relatively high in July at 86%. As the seasons transition from the lush, humid days of summer to the milder conditions of autumn, August serves as a significant point where humidity starts to outpace the earlier months. Interestingly, throughout the winter and spring, humidity hovers in the 84-86% range, but summer consistently brings a touch more moisture to the air, creating a refreshing yet sticky atmosphere typical of the region. Overall, the August humidity highlights Cornwall’s characteristic wetness, setting the stage for the gradual decrease in moisture as the fall takes hold.
In August, Cornwall experiences a UV Index of 8, categorizing it as very high, which means sun protection is essential during outdoor activities. With a burn time of just 15 minutes, it's crucial to prioritize skin safety to prevent sunburn. This trend is consistent with the peak summer months of June and July, where the UV Index also reaches 8 and 10 respectively. As summer wanes, September sees a slight decrease to a UV Index of 7, transitioning back to high exposure levels. To stay informed and safe, check out the detailed insights at Cornwall UV Index.
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August in Cornwall, Canada, shines as the pinnacle of summer, boasting 351 hours of sunshine—the highest for the year. This month follows a steady upward trend, with increasing daylight starting from a modest 98 hours in January. As spring blooms into summer, the sun steadily graces the town, peaking in August before beginning its descent into more subdued months. From April's 243 hours to August's radiant glow, the progression mirrors the warmth of the season, inviting locals and visitors alike to bask in every sunlit moment. As autumn approaches, sunshine begins to wane, dropping to 271 hours in September, yet August remains a cherished highlight in Cornwall's sunny calendar.
In Cornwall, Canada, August stands out as a notably sunny month, boasting a 44% chance of sunshine—one of the highest probabilities of the year. This marks a clear trend of increased sunshine as summer progresses; for instance, the chances rise significantly from 27% in July to August's peak. Interestingly, while May and June also exhibit decent sunshine probabilities at 41% and 42% respectively, they don’t quite match August's summer finale. Following August, the likelihood of sunny days gently dips into September and beyond, suggesting that if you're seeking warmth and light, late summer in Cornwall is certainly the time to bask in the sun.
In August, Cornwall, Canada, basks in approximately 14 hours of daylight, marking a graceful transition from the long summer days of July. This slight decrease from the peak sunlight duration reflects the subtle shift towards autumn, as daylight begins to wane. Following a progression from a modest 9 hours in January to a vibrant 15 hours in both June and July, the daylight hours in August maintain a pleasing balance, offering ample time for outdoor adventures and late evening strolls. As the month closes, residents might notice the days growing shorter, signaling the approach of fall and the beautiful changes it brings.
In August, Cornwall, Canada experiences its calmest winds of the year, with an average wind speed of just 4.6 m/s (10 mph). This subtle decline follows the peak of summer, where July recorded a slightly higher average of 4.7 m/s (11 mph), indicating a gentle easing into the late summer months. As autumn approaches, wind speeds begin to rise again in September and November, peaking at 5.8 m/s (13 mph). It's interesting to note that while January and March boast higher wind speeds at 5.3 m/s (12 mph) and 6.2 m/s (14 mph) respectively, the August breeze sets a serene tone, inviting locals and visitors alike to relish in the tranquility of the season before the crispness of fall takes hold.
The weather in Cornwall changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Cornwall and find detailed weather information for every month.
August and January present contrasting weather experiences. In August, temperatures are much warmer, ranging from a minimum of 11°C (51°F) to a comfortable average of 20°C (68°F), peaking at a maximum of 30°C (86°F). With 73 mm (2.9 in) of precipitation over approximately 10 days and high humidity of 87%, summer days can feel quite muggy. In stark contrast, January brings frigid conditions with temperatures dropping as low as -20°C (-3°F), an average of -5°C (23°F), and a maximum temperature of 14°C (58°F). Despite the colder temperatures, January sees slightly higher precipitation at 81 mm (3.2 in), also spread over about 10 days, with a humidity level of 84%. For more detailed insights, check out Cornwall weather in January.
August and February present stark contrasts in weather conditions. In August, temperatures range from a pleasant minimum of 11°C (51°F) to a maximum of 30°C (86°F), creating a warm and inviting atmosphere with an average of 20°C (68°F). However, it is also a relatively humid month with an average humidity of 87% and about 73 mm (2.9 in) of precipitation spread over 10 days. In contrast, February experiences a much colder climate, with temperatures plummeting to a minimum of -20°C (-4°F) and only reaching a maximum of 9°C (49°F), averaging -5°C (22°F). This winter month sees even more precipitation at 93 mm (3.7 in) over 12 days, accompanied by slightly lower humidity at 84%. For those interested in more details, check out Cornwall weather in February.
August and March display contrasting weather patterns that reflect the transition between summer and winter. In August, temperatures range from a minimum of 11°C (51°F) to a pleasant average of 20°C (68°F), peaking at 30°C (86°F). This month also features an average humidity of 87% and about 73 mm (2.9 in) of precipitation spread over 10 days. In stark contrast, March experiences much colder conditions, with temperatures plummeting to a low of -19°C (-2°F) and an average of -2°C (28°F), with a maximum of only 11°C (53°F). Despite having slightly higher precipitation at 75 mm (2.9 in), it falls over more days, totaling 13, with humidity slightly lower at 86%. For a deeper dive into March's weather specifics, check out Cornwall weather in March.
When comparing the weather between August and April, it's evident that August experiences significantly warmer temperatures, with an average of 20°C (68°F) and maximums reaching up to 30°C (86°F). In contrast, April is much cooler, featuring an average temperature of only 4°C (39°F) and maximums of 18°C (65°F). Both months see a moderately high level of humidity, with August at 87% and April slightly lower at 86%. Precipitation levels are notable in both months, with April receiving 85 mm (3.4 in) over approximately 12 days, while August experiences 73 mm (2.9 in) over 10 days. For more detailed information, check out Cornwall weather in April.
In comparing the weather between August and May, notable differences emerge. August typically showcases warmer temperatures, ranging from a minimum of 11°C (51°F) to a maximum of 30°C (86°F), with an average of 20°C (68°F). The month experiences about 73 mm (2.9 in) of rainfall over approximately 10 days, alongside high humidity levels at 87%. In contrast, May presents a cooler climate, with temperatures ranging from -3°C (27°F) to a maximum of 24°C (76°F) and an average of 9°C (49°F). Precipitation is slightly higher at 88 mm (3.5 in) over around 13 days, while humidity remains relatively close at 85%. For a detailed look at May's weather in Cornwall, you can check this link: Cornwall weather in May.
When comparing the weather in August and June, August tends to be warmer, with average temperatures around 20°C (68°F) compared to June's cooler average of 15°C (60°F). The maximum temperatures in August can reach up to 30°C (86°F), while June's peak is slightly lower at 29°C (84°F). However, June experiences more rainfall, with a total precipitation of 97 mm (3.8 in) over 12 days, compared to August's 73 mm (2.9 in) over 10 days. Humidity is slightly higher in August at 87%, whereas June has a more moderate 82%. For more details on June weather, you can check Cornwall weather in June.
When comparing the weather in August and July, both months exhibit similar temperature ranges, with August maintaining a minimum of 11°C (51°F), an average of 20°C (68°F), and a maximum of 30°C (86°F), which closely mirrors July's readings of min 11°C (52°F), avg 20°C (67°F), and max 30°C (85°F). Precipitation levels in August are slightly higher, totaling 73 mm (2.9 in) over 10 days, compared to July's 68 mm (2.7 in) over the same number of days. Additionally, humidity is slightly elevated in August at 87%, while July has a humidity level of 86%. For more detailed information, you can visit Cornwall weather in July.
August and September present a noticeable transition in weather patterns. In August, temperatures range from a minimum of 11°C (51°F) to a maximum of 30°C (86°F), with an average temperature of 20°C (68°F). The month sees about 73 mm (2.9 in) of precipitation over 10 rainy days and high humidity at 87%. Conversely, September experiences cooler temperatures, with a minimum of 3°C (38°F), an average of 16°C (61°F), and a maximum of 27°C (82°F). Precipitation increases slightly to 96 mm (3.8 in), also over 10 days, and humidity remains relatively stable at 85%. This shift marks the onset of autumn, bringing cooler days and more frequent, albeit slightly heavier, rainfall. For a more detailed look at September weather trends, check out Cornwall weather in September.
In comparing August to October, the weather varies significantly, with August generally being warmer and more humid. In August, temperatures range from a minimum of 11°C (51°F) to a maximum of 30°C (86°F), accompanied by an average temperature of 20°C (68°F) and high humidity at 87%. In contrast, October sees colder temperatures, with a minimum of -2°C (29°F) and a maximum of 24°C (75°F). The average temperature drops to around 10°C (50°F), with humidity slightly lower at 85%. Precipitation levels are similar, with August receiving 73 mm (2.9 in) over 10 days and October slightly higher at 77 mm (3.0 in) over 11 days. For more details about October weather, visit Cornwall weather in October.
August and November present starkly contrasting weather conditions. In August, temperatures are milder with averages around 20°C (68°F) and highs reaching up to 30°C (86°F), accompanied by relatively high humidity at 87% and moderate precipitation of 73 mm (2.9 in) over 10 days. In contrast, November brings a significant drop in temperatures, with averages plummeting to 4°C (39°F) and nighttime lows dipping as low as -12°C (10°F). The month is also wetter, experiencing 135 mm (5.3 in) of precipitation over 15 days, while humidity remains similar at 85%. For more specific details about November weather, check out Cornwall weather in November.
The weather in August and December presents a stark contrast in Cornwall. August typically enjoys milder temperatures, ranging from a minimum of 11°C to a maximum of 30°C, with an average of 20°C and relatively high humidity at 87%. Precipitation is moderate, totaling 73 mm over about 10 days. In sharp contrast, December experiences frigid conditions, with temperatures plummeting to a minimum of -19°C and only reaching a maximum of 14°C, resulting in an average of -2°C. The month sees more precipitation, totaling 97 mm across 13 days, alongside a slightly lower humidity of 84%. For more insights into December weather, check out Cornwall weather in December.
August in Cornwall stands out with its warm temperatures and high humidity, making it a vibrant time of year compared to other months. Although the days can warm up to a balmy 30°C (86°F), evenings bring a refreshing cooldown, perfect for unwinding. Rain is more frequent this month, with about 10 days seeing precipitation, contributing to the lush landscapes that Cornwall is known for. The rich aromas and sights of late summer come alive, inviting visitors to enjoy outdoor activities amidst picturesque scenery. For more insight on the weather trends throughout the year, check out Cornwall Climate.