Last updated: April 22, 2025
August in Saint John, Canada ushers in a delightful summer atmosphere, characterized by comfortable temperatures and moisture-laden air. With maximum temperatures reaching up to 23°C (74°F) and an average temperature hovering around 17°C (63°F), residents and visitors enjoy pleasant days, although the minimum temperature can dip to a cool 11°C (53°F). This month sees approximately 89 mm (3.5 in) of precipitation spread across 10 days, contributing to the region's lush greenery. Humidity levels are notably high at 82%, giving the air a refreshing, if slightly humid, feel that is typical of the season in this beautiful coastal town.
In August, Saint John, Canada, embraces the warmth of summer with minimum temperatures around 11°C (53°F) and delightful averages peaking at 17°C (63°F). This month stands out with a maximum of 23°C (74°F), offering locals and visitors alike the perfect weather for outdoor activities. As summer's heat reaches its pinnacle, the city transitions from the cooler temperatures of earlier months, such as January's icy lows of -22°C (-8°F) and February's average of -3°C (26°F). This notable rise reflects a steady climb towards pleasant evenings and sunny days, inviting everyone to enjoy the vibrant natural beauty and outdoor festivities that characterize the region at this time of year.
In August, Saint John experiences a relatively mild precipitation pattern, with 89 mm (approximately 3.5 in) of rain recorded over a typical 10 days. This marks a slight decrease compared to the previous month, July, which saw 92 mm of rainfall. The summer continues to show variability, as the region transitions into the fall months. Interestingly, the trend of lower precipitation levels in August sets the stage for a notable increase in September, where the rain typically escalates to 108 mm. Overall, while August brings moderate rainfall, it serves as a brief reprieve from the heavier downpours that define the later months of the year, which often see much larger totals, especially in the lead-up to winter.
In Saint John, Canada, August delivers a comfortable humidity level of 82%, continuing a trend of relatively high moisture that characterizes the summer months. Following a peak of 84% in both February and July, the humidity in August remains consistent with the levels seen in the preceding month and the upcoming September. This consistency suggests a stable maritime climate, where residents can expect humid conditions throughout the summer, complemented by a gradual shift towards the cooler and slightly drier months ahead in autumn. Overall, August's humidity provides a lingering warmth that enhances the vibrant summer atmosphere of the region before transitioning into fall.
In August, Saint John experiences a UV Index of 8, categorizing the sunlight exposure as very high. This trend reflects a continuation of the intense UV levels seen in July, which also registered an 8. With a burn time of just 15 minutes, it's crucial for residents and visitors alike to take precautions against harmful sun exposure. The summer months show a steady increase in UV intensity, peaking in June at 10 before slightly decreasing in September. To stay safe while enjoying the outdoors, refer to the detailed UV Index and recommendations at Saint John UV Index.
UV Risk Categories
In Saint John, Canada, August shines as the pinnacle of sunshine, boasting an impressive 312 hours of radiant daylight. This peak comes after a steady rise from the depths of winter, where January struggles with only 127 hours of sun. As the seasons transition from the chill of spring to the warmth of summer, sunshine hours steadily accumulate, peaking not only in August but also maintaining a strong showing in the preceding months of June and July with 307 and 304 hours, respectively. This trend reflects the region’s delightful summer, leading into a gradual tapering of daylight as autumn sets in, with September still offering a robust 266 hours. The progression of sunny hours showcases the charm of summer in Saint John, where August truly embodies the essence of warmth and brightness before the shorter days of fall return.
In August, the likelihood of sunny weather in Saint John, Canada, stands at 29%, consistent with the somewhat overcast conditions of both January and April. This places June and July at the lower end of the spectrum, where July notably dips to 19%—the least chance for sunshine in the year. Interestingly, after August, the probability of sunny days begins to trend upward again in September, reaching 42%. Overall, while August may not be the sunniest month, it fits within a broader pattern of fluctuating sunshine across the seasons, hinting at the unpredictable charm of maritime weather.
As summer begins to wane, August in Saint John, Canada, boasts an impressive 13 hours of daylight, creating a perfect backdrop for outdoor activities. Following the peak of 15 hours in both June and July, this decrease reflects a gradual transition towards autumn. Interestingly, daylight duration sees a slight drop from the vibrant summer months, yet it remains significantly longer than the winter days ahead. With each passing day, sunlight gently recedes, foreshadowing the cozy ambiance of September's 12 hours. This rhythm of daylight offers a beautiful tapestry of changing seasons, as the warmth of summer gradually yields to the crispness of fall.
In Saint John, Canada, the breeze of August offers a gentle respite as average wind speeds dip to 4.0 m/s (9 mph), marking the lowest point of the year. This decline follows a gradual decrease from the more vigorous winds of late spring and early summer, where speeds hovered around 4.8 m/s (11 mph) in May and 4.1 m/s (9 mph) in July. As the summer months unfold, the winds become softer, providing a serene backdrop to the warm days. Moving into September, there's a slight uptick to 4.6 m/s (10 mph), suggesting a shift as the season starts to transition into fall, but August remains a tranquil month, ideal for enjoying the outdoors. Overall, the trends in wind speed highlight the calming nature of summer’s end in this charming coastal city.
The weather in Saint John 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 Saint John and find detailed weather information for every month.
August and January present stark contrasts in weather conditions. In August, temperatures range from a minimum of 11°C (53°F) to a maximum of 23°C (74°F), with an average of 17°C (63°F). This month sees around 89 mm (3.5 in) of precipitation, spread across 10 days, and the humidity remains high at 82%. In contrast, January experiences much colder temperatures, with a minimum of -22°C (-8°F) and a maximum of 13°C (56°F), averaging -4°C (26°F). Precipitation is slightly higher at 107 mm (4.2 in), also over 10 days, while humidity is comparable at 83%. For more details on the cold winter climate, you can check out Saint John weather in January.
August and February present contrasting weather patterns in Saint John. In August, temperatures range from a mild 11°C (53°F) to a pleasant 23°C (74°F), with an average of 17°C (63°F). The month experiences about 89 mm (3.5 in) of rainfall over approximately 10 days, accompanied by high humidity levels of 82%. In stark contrast, February is marked by much colder conditions, with temperatures plummeting between -20°C (-4°F) and a maximum of 10°C (50°F), averaging a frigid -3°C (26°F). This winter month sees more precipitation, totaling 112 mm (4.4 in) over around 12 days, and humidity slightly higher at 84%. For more detailed insights, you can visit Saint John weather in February.
When comparing the weather in August and March, it's clear that these months represent opposite ends of the seasonal spectrum. August offers milder temperatures with a minimum of 11°C (53°F) and an average temperature of 17°C (63°F), peaking at 23°C (74°F). In contrast, March is characterized by much colder conditions, with temperatures dipping as low as -17°C (2°F) and averaging around -1°C (31°F), only reaching a maximum of 11°C (52°F). Precipitation levels are similar, with both months receiving around 89 mm (3.5 in) of rain or snow across 10 days. Additionally, humidity remains constant at 82% in both months. For more details about March weather, check out Saint John weather in March.
In comparing the weather between April and August, a clear contrast emerges. August enjoys milder temperatures, with a minimum of 11°C (53°F), an average of 17°C (63°F), and a maximum of 23°C (74°F), while April is significantly cooler, featuring a minimum of -5°C (23°F), an average of 4°C (40°F), and a maximum of only 13°C (55°F). Despite August's warmer temperatures, it experiences 89 mm (3.5 in) of precipitation over about 10 days, while April sees a slightly higher precipitation amount of 129 mm (5.1 in) across 13 days. Both months have high humidity levels, with August at 82% and April at 80%. For more details, you can explore Saint John weather in April.
When comparing the weather in August and May, August tends to be warmer with average temperatures ranging from 11°C (53°F) to 23°C (74°F), while May has cooler temperatures, with an average range of 1°C (33°F) to 20°C (68°F). Although August is warmer, it is also more humid, with humidity levels at 82%, compared to May’s 78%. In terms of precipitation, May experiences slightly more rain, with 117 mm (4.6 in) over 12 days, compared to August's 89 mm (3.5 in) over 10 days. For a more detailed look at the weather specifics, you can visit Saint John weather in May.
When comparing the weather in August and June, August tends to be warmer overall, with average temperatures reaching 17°C (63°F) compared to June's average of 13°C (56°F). While both months share a similar humidity level of 82%, August experiences milder minimum and maximum temperatures, ranging from 11°C (53°F) to 23°C (74°F), whereas June sees temperatures from 4°C (39°F) to 21°C (71°F). Rainfall is slightly less in August, with 89 mm (3.5 in) over 10 days, compared to June's 110 mm (4.3 in) over 11 days. For more detailed information about June's weather, you can visit Saint John weather in June.
In comparing the weather of July and August, both months exhibit similar temperature ranges, with August having a slightly warmer average temperature of 17°C (63°F) compared to July's 16°C (62°F). While July sees a maximum of 22°C (72°F), August surpasses this with a high of 23°C (74°F). Precipitation levels are relatively close, with July receiving 92 mm (3.6 in) over 13 days, while August has 89 mm (3.5 in) across 10 days. Humidity is slightly lower in August at 82%, compared to July's 84%. For a more detailed view of July's conditions, you can visit Saint John weather in July.
In comparing the weather between August and September, August tends to be slightly warmer with an average temperature of 17°C (63°F) and a maximum of 23°C (74°F), whereas September cools down to an average of 15°C (59°F), with a maximum of 22°C (73°F). Both months experience a similar number of rainy days, with 10 days of precipitation each; however, September sees a bit more rain, totaling 108 mm (4.3 in) compared to August's 89 mm (3.5 in). Humidity levels remain consistent at 82% for both months, contributing to a damp atmosphere as summer transitions into autumn. For more details on the weather specifics, you can check Saint John weather in September.
In August, the weather in Saint John is relatively mild, with average temperatures ranging from a minimum of 11°C (53°F) to a maximum of 23°C (74°F) and a total precipitation of 89 mm (3.5 in) over approximately 10 days. The humidity remains high at 82%, creating a warm and slightly sticky atmosphere. In contrast, October brings a noticeable drop in temperatures, featuring an average range of 0°C (33°F) to 19°C (67°F). Despite the cooler conditions, precipitation increases to 123 mm (4.8 in) over about 12 days, maintaining the same humidity level of 82%. For a detailed look at October weather, visit Saint John weather in October.
August and November present a striking contrast in weather conditions. In August, temperatures are generally mild, with a minimum of 11°C (53°F) and a pleasant average of 17°C (63°F), peaking at 23°C (74°F). However, this month does experience moderate precipitation, totaling 89 mm (3.5 in) over about 10 days, with humidity levels high at 82%. In contrast, November ushers in much colder temperatures, with a minimum dipping to -12°C (10°F) and an average of just 5°C (40°F), although it can still reach a maximum of 16°C (62°F). This month sees increased rainfall, accumulating 184 mm (7.3 in) across 14 days and humidity slightly rising to 84%. For a deeper look at November weather, you can check Saint John weather in November.
August and December present strikingly different weather experiences. In August, temperatures range from a minimum of 11°C (53°F) to a pleasant maximum of 23°C (74°F), with an average of 17°C (63°F). The month sees about 89 mm (3.5 in) of precipitation over approximately 10 days, coupled with a humidity level of 82%. In contrast, December is significantly colder, with temperatures dropping to a minimum of -18°C (-1°F) and peaking at a maximum of 14°C (57°F), averaging -1°C (31°F). Precipitation increases to 142 mm (5.6 in) across 12 days, while humidity remains constant at 82%. For more detailed insights, you can check out the Saint John weather in December.
In August, Saint John experiences a delightful blend of warmth and humidity, distinguishing it from the cooler months of spring and early summer. With temperatures reaching a maximum of 23°C, residents and visitors alike can enjoy outdoor activities amid the lush surroundings. While the month sees an average temperature around 17°C, the higher humidity levels, averaging 82%, create a tropical feel that enhances the summer vibe. Although rain does make its presence known with about 10 days of precipitation, the overall warmth tends to overshadow these brief showers, setting August apart as one of the most vibrant months in the Saint John Climate landscape. For more details, visit Saint John Climate.