Last updated: March 17, 2025
August in Portsmouth, United Kingdom, welcomes a delightful blend of warm weather and occasional rain, making it a captivating time to experience the city. With maximum temperatures reaching 26°C (80°F) and an average of 18°C (64°F), the month offers a pleasant climate for outdoor activities. However, be prepared for some wet days, as 12 days of precipitation contribute to a total of 78 mm (3.1 in) of rain, coupled with humidity levels around 76%. Whether soaking in the sun or dodging summer showers, Portsmouth in August promises a vibrant atmosphere filled with British charm.
August in Portsmouth, United Kingdom, marks the pinnacle of summer, bringing with it a delightful warmth that stands in contrast to the chill of earlier months. With temperatures ranging from a minimum of 11°C (52°F) to a maximum of 26°C (80°F), the average climate settles comfortably at 18°C (64°F), making it a favored time for outdoor activities and coastal adventures. As the warmest month of the year, August invites both locals and visitors to bask in the sun, relish in the pleasant evenings, and enjoy the vibrant atmosphere that blossoms from the lingering warmth of summer before the cooler autumn months begin to take hold.
In August, Portsmouth experiences a notable increase in precipitation, with 78 mm (3.1 inches) of rain falling across 12 days. This marks a slight rise from July's totals, hinting at a shift into the wetter autumn months. As summer transitions, the increase in rainfall serves as a reminder of the region's unpredictability, following June's and July's relatively drier spells. August's precipitation, while not the highest of the year, sets the stage for a more pronounced rainy season ahead, with October and December typically showcasing the peak precipitation levels. This steady trend underscores the changing dynamics of Portsmouth's climate as it prepares for the arrival of fall.
In August, Portsmouth experiences a noticeable shift in humidity levels, with an average of 76%. This marks a decline from the peak summer months, following July's lower humidity of 71%. August's figures suggest a transition as the warm weather begins to ebb, with humidity levels still comfortably higher than the early spring months. As the year progresses, the trend indicates that Portsmouth typically endures its most humid conditions during the winter months, with humidity rising sharply to 90% in October and lingering above 90% through December. Thus, while August offers a brief respite from summer's peak humidity, it foreshadows the return of the wet conditions typical of the fall and winter seasons.
In August, Portsmouth experiences a UV Index of 7, categorized as high, which indicates a significant increase in sun exposure compared to the earlier months. With a burn time of just 25 minutes, this month signals the culmination of a summer filled with strong UV radiation, following the peak levels recorded in June and July. While the intensity slightly tapers from those summer highs, residents and visitors should remain vigilant, as even in late summer, the risk of skin damage prevails. This trend underscores the importance of sun safety measures throughout the warmer months, transitioning into a more moderate September. For more detailed information, visit Portsmouth UV Index.
UV Risk Categories
In August, Portsmouth basks in a generous 386 hours of sunshine, making it one of the sunniest months of the year. This peak summer month, while slightly less bright than July’s impressive 423 hours, still showcases a delightful trend of warming days that have steadily increased since the winter months. The sunshine hours rise significantly from January's mere 105 hours, demonstrating how the city transforms into a vibrant destination full of outdoor activities. As the summer progresses, this pattern of abundant sunshine not only enhances the local charm but also invites both residents and tourists to relish the beauty of Portsmouth before the days shorten in the fall.
August in Portsmouth tends to offer a moderate chance of sunshine, with around 33% likelihood of sunny days. While this is a drop from the previous month of July, which enjoys a sunnier disposition at 42%, it still reflects a decent summer experience. Comparing this to earlier months, such as April with its 58% chance, or March at 38%, reveals a clear trend where the early summer generally beckons more sunshine than late summer. As the summer winds down into autumn, the chances of sun linger slightly through September at 36%, but the overall shift illustrates Portsmouth’s variable climate—where sunny days often flirt with unpredictability.
In August, Portsmouth basks in 14 hours of daylight, marking a gradual decline from the sun-drenched heights of June and July, when daylight peaked at 16 and 15 hours, respectively. This month acts as a poignant reminder of summer's final embrace, as daylight begins to wane in preparation for the shorter days ahead in autumn. Following the steady build-up from January's humble 8 hours, the stretch of longer days reaches a gentle transition, ultimately leading to September's 12 hours. This rhythmic pattern showcases the ebb and flow of light throughout the year, highlighting Portsmouth's beautiful seasonal shifts.
In August, the winds in Portsmouth pick up slightly with an average speed of 5.3 m/s (12 mph), reflecting a gentle breeze that often graces the coastal town during the late summer months. Compared to the preceding months, June and July, which both saw lighter winds at 4.0 m/s (9 mph) and 4.6 m/s (10 mph) respectively, August offers a more favorable environment for seaside activities. It's interesting to note that following August, the wind speed picks up again in October at 6.2 m/s (14 mph), suggesting a shift as summer wanes and autumn approaches. Overall, August presents a harmonious balance, bridging the calmer summer winds with the upcoming briskness of fall.
The weather in Portsmouth 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 Portsmouth and find detailed weather information for every month.
In August, the weather tends to be warmer with average temperatures around 18°C (64°F) and maximum highs reaching 26°C (80°F), making it a pleasant month for outdoor activities. There is some rainfall, with about 78 mm (3.1 in) spread over 12 days and a humidity level of 76%. In contrast, January is much cooler, with average temperatures dropping to 7°C (44°F) and a maximum of only 13°C (56°F). The precipitation is slightly lower at 68 mm (2.7 in) over 11 days, but the humidity rises to 91%, contributing to a chillier atmosphere. For a deeper understanding of the winter climate, you can visit Portsmouth weather in January.
When comparing the weather in August and February, there is a striking contrast in temperatures and overall climate conditions. August typically enjoys milder temperatures, with an average of 18°C (64°F) and highs reaching up to 26°C (80°F), while February is much cooler, with an average temperature of only 7°C (45°F) and maximums of 13°C (55°F). Both months experience a similar amount of precipitation, approximately 75-78 mm (3.0-3.1 in) over about 12 days, although February tends to be cloudier with higher humidity levels at 89% compared to August’s 76%. For a more detailed look at February's climate, you can visit Portsmouth weather in February.
August and March exhibit stark contrasts in weather conditions. In August, the temperatures range from a minimum of 11°C (52°F) to a pleasant maximum of 26°C (80°F), with an average of 18°C (64°F). Humidity is relatively high at 76%, and the month sees about 78 mm (3.1 in) of precipitation over 12 days. In contrast, March experiences much cooler temperatures, ranging from a minimum of -3°C (28°F) to a maximum of 14°C (58°F), with an average of only 8°C (47°F). The precipitation in March totals slightly less at 70 mm (2.7 in) across 13 days, coupled with a higher humidity level of 86%. For more detailed information, you can check Portsmouth weather in March.
When comparing the weather in April and August, notable contrasts emerge. In April, temperatures range from a chilly minimum of 1°C (34°F) to a pleasant maximum of 19°C (66°F), with an average temperature of 10°C (50°F). Precipitation is relatively low at 32 mm (1.3 in) across about 7 days, and humidity levels are high at 85%. Conversely, August presents warmer conditions, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 26°C (80°F) and an average of 18°C (64°F). Although it experiences more rainfall, accumulating 78 mm (3.1 in) over 12 days, the humidity is slightly lower at 76%. For more detailed information, you can check out Portsmouth weather in April.
The weather in August is generally warmer than in May, with average temperatures reaching 18°C (64°F) compared to May's average of 13°C (55°F). August experiences higher maximum temperatures, peaking at 26°C (80°F), while May's maximum temperature is a cooler 22°C (71°F). In terms of precipitation, August has more rainfall, totaling 78 mm (3.1 in) over 12 days, whereas May sees 56 mm (2.2 in) over just 11 days. Interestingly, the humidity levels are quite similar, with August averaging 76% and May slightly higher at 79%. For more details, check out Portsmouth weather in May.
In comparing the weather between August and June, August tends to be slightly warmer, with average temperatures reaching 18°C (64°F) and maximums of 26°C (80°F), compared to June's average of 16°C (61°F) and maximums of 25°C (76°F). Both months experience relatively high humidity, with August at 76% and June slightly higher at 80%. Precipitation levels are similar as well, with August seeing 78 mm (3.1 in) over 12 days, while June records 73 mm (2.9 in) over 9 days, indicating that August is slightly wetter despite having more rainfall days. For more details, check out Portsmouth weather in June.
In comparing the weather of August and July, we see some notable differences. August features slightly cooler minimum temperatures, averaging around 11°C (52°F), with maximum temperatures peaking at 26°C (80°F), while July's temperatures range from a minimum of 12°C (53°F) to a maximum of 25°C (78°F). Additionally, August experiences more precipitation, with 78 mm (3.1 in) spread over 12 days, compared to July's 58 mm (2.3 in) over 11 days. Humidity levels are also higher in August at 76%, compared to July's 71%. For a more detailed look at July’s weather, you can visit Portsmouth weather in July.
August weather in Portsmouth is characterized by warmer temperatures, with a minimum of 11°C (52°F) and an average of 18°C (64°F), peaking at a maximum of 26°C (80°F). This month typically sees about 78 mm (3.1 in) of precipitation over 12 days, accompanied by a humidity level of 76%. In contrast, September brings cooler conditions, with a minimum temperature of 8°C (47°F) and an average of 16°C (61°F), while the maximum daytime temperature reaches 24°C (76°F). Rainfall decreases to 57 mm (2.2 in) over 10 days, and humidity slightly increases to 82%. For more details on September weather, check out Portsmouth weather in September.
August and October exhibit notable differences in weather patterns. August tends to be warmer, with average temperatures reaching around 18°C (64°F), while October cools down significantly, averaging just 13°C (56°F). Precipitation levels also rise in October, with 117 mm (4.6 in) of rainfall over 16 days, compared to August's 78 mm (3.1 in) over 12 days. Additionally, October's higher humidity of 90% creates a much more damp atmosphere than August's 76%. For more details, check out Portsmouth weather in October.
August and November showcase distinct differences in weather patterns, reflecting the transition from summer to autumn. In August, temperatures are generally milder, with a minimum of 11°C (52°F) and an average of 18°C (64°F), peaking at 26°C (80°F). However, this month also experiences considerable humidity at 76% and notable rainfall, totaling 78 mm (3.1 in) over approximately 12 days. In contrast, November brings a significant drop in temperature, with lows reaching 1°C (33°F) and an average of just 10°C (50°F), while the maximum temperature doesn't exceed 16°C (61°F). This month is characterized by higher humidity at 92% and increased precipitation, with 87 mm (3.4 in) spread across around 15 days. For a closer look at what to expect from the weather in November, you can check Portsmouth weather in November.
In August, the weather is generally warmer, with temperatures ranging from a minimum of 11°C (52°F) to a maximum of 26°C (80°F), and an average temperature of 18°C (64°F). During this month, there is an average of 78 mm (3.1 in) of precipitation spread over approximately 12 days, accompanied by a humidity level of 76%. In contrast, December brings much cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 14°C (57°F), resulting in an average of just 8°C (47°F). Precipitation increases to 118 mm (4.7 in) over about 16 days, and humidity rises to 92%. For more detailed information, check out Portsmouth weather in December.
August in Portsmouth brings a delightful blend of warmth and humidity, setting it apart from the cooler months of the year. With average temperatures reaching a comfortable 18°C, this month is characterized by more frequent warm days than its predecessors. However, it also sees a notable increase in precipitation, with about 12 days experiencing light showers, contributing to the overall humidity level of 76%. This combination of warmth and occasional rain makes August a unique transition period, inviting both locals and visitors to enjoy the vibrant summer atmosphere while preparing for the fall. For a deeper dive into the year-round weather patterns, explore Portsmouth Climate.