Last updated: August 21, 2025
In August, Saint Helier, Jersey experiences a delightful blend of mild temperatures and moderate humidity, making it a captivating destination for visitors. With a maximum temperature reaching up to 25°C (78°F) and an average of 18°C (64°F), days remain pleasantly warm, while nights offer a refreshing coolness at a minimum of 14°C (57°F). However, be prepared for some rain, as the month sees an average precipitation of 66 mm (2.6 in) spread across approximately 13 days, leading to lush greenery and vibrant landscapes. The 73% humidity adds to the island's charm, creating an inviting atmosphere for outdoor exploration and leisure amidst the picturesque coastal scenery.
In August, Saint Helier, Jersey, basks in the warmth of summer, showcasing a delightful climate that beckons both locals and tourists alike. With temperatures ranging from a mild 14°C (57°F) at night to a pleasant max of 25°C (78°F) during the day, the average temperature sits comfortably at 18°C (64°F). This month marks a peak in weather, following the steady rise from the cooler months of January through July, where temperatures gradually climbed from a chilly 2°C (35°F) to a balmy 27°C (80°F) in July. As summer reaches its zenith, August presents the ideal backdrop for outdoor adventures, beach outings, and soaking up the sun, making it a prime time to experience all that this picturesque destination has to offer.
In August, Saint Helier experiences a moderate precipitation amount of 66 mm (2.6 in), accompanied by 13 rainy days. This marks a subtle increase from the preceding month of July, which saw only 47 mm (1.9 in) over 9 days, suggesting a return to a somewhat wetter climate as summer transitions toward autumn. While August isn’t the wettest month on record, it indicates a notable uptick in rainfall that foreshadows the much rainier months ahead, such as October and December, which often deliver over 150 mm. Overall, August serves as a bridge, balancing summer’s lingering warmth with the impending autumn rains, creating a dynamic climate that emphasizes the island’s varied weather patterns.
August in Saint Helier, Jersey, brings a modest drop in humidity to 73%, signaling a subtle shift from the more humid summer months. This slight decrease follows a trend observed throughout the summer, where July's humidity dipped to 69%, offering residents and visitors a brief respite from the heavier, more oppressive moisture of earlier months. As summer transitions to fall, humidity levels begin to rise again in September to 79%, ultimately peaking again in the chill of late autumn and winter. This fluctuation showcases the island's characteristic maritime climate, with high humidity dominating the beginning and end of the year, giving way to milder conditions in the heart of summer.
In August, Saint Helier experiences a very high UV Index of 8, with a quick burn time of just 15 minutes under the sun. This peak in UV exposure follows a trend of increasing levels throughout the summer, having reached 9 in both June and July. As the season transitions into the fall, the UV Index begins to drop, returning to high levels in September and moderating further as autumn approaches. It's essential for residents and visitors to be cautious and protect their skin during this vibrant month. For more detailed information, visit Saint Helier UV Index.
UV Risk Categories
In August, Saint Helier, Jersey, basks in a rich glow of 392 hours of sunshine, marking a delightful continuation of the summer's warmth. Following the peak of July's 432 hours, the sunlight begins to gently wane, yet August still stands out as a vibrant month, ensuring residents and visitors alike can enjoy numerous outdoor activities. As the season transitions into September, with a noticeable dip to 334 hours, this period of golden sunshine becomes a cherished memory. The overall trend showcases a gradual increase in sunlight from the start of the year, peaking during the summer months, before settling into the mellow tones of autumn.
In Saint Helier, Jersey, the likelihood of sunny weather in August hovers around 41%, a figure that maintains a consistency seen in the preceding months. This trend reflects a slight drop from the peak sunshine potential of 64% in April, yet it remains relatively robust when compared to the lower chances earlier in the year. As summer progresses, July's sun-seeking opportunities at 46% transition into August’s steady likelihood, signifying that while the peak sunshine has passed, residents and visitors can still look forward to ample sun-drenched days as the season winds down. Overall, the data suggests that August offers a balanced blend of sun and shade, making it a delightful time for outdoor activities in this coastal haven.
In Saint Helier, Jersey, August marks a transitional phase in daylight duration, with the sun gracing the skies for approximately 14 hours each day. This follows the peak of summer in June, where daylight stretches to a glorious 16 hours, gradually tapering off as the year progresses into autumn. The gradual decline from July's 15 hours indicates the creeping influence of shorter days, setting the stage for September's 12 hours of sunlight. Overall, August embodies the last hints of summer's brilliance, as it bridges the vibrant, elongated days of summer with the shorter, mellow light of fall. This rhythmic ebb and flow of daylight highlights the island's unique seasonal charm and emphasizes its enchanting shifts throughout the year.
In August, the winds in Saint Helier, Jersey, typically offer a gentle embrace, with an average speed of 6.2 m/s (14 mph). This marks a slight increase from the milder summer months of June and July, which recorded just 4.4 m/s (10 mph) and 5.8 m/s (13 mph), respectively. As the summer vacations wind down, the slightly stronger breeze of August continues to bring a refreshing touch to the island's vibrant atmosphere. While it's not the windiest month of the year—October and December boast higher averages of 7.4 m/s (17 mph) and 8.7 m/s (19 mph)—August's calm yet invigorating winds create an ideal backdrop for outdoor activities and coastal strolls, inviting both locals and visitors to savor the beauty of the season. Overall, a trend emerges in which August balances the tail end of summer's warmth with just enough wind to keep things lively.
Weather in Saint Helier varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Saint Helier, focusing on differences in temperature, rainfall, humidity, and UV levels.
In August, the weather tends to be much warmer and more pleasant than in January, with average temperatures ranging from a cool 14°C (57°F) to a comfortable maximum of 25°C (78°F). The humidity is relatively high at 73%, and while there is some rainfall, with 66 mm (2.6 in) over about 13 days, it doesn't significantly dampen the summer vibe. In contrast, January brings much colder conditions, with an average temperature of just 8°C (47°F) and highs only reaching 13°C (56°F). This month experiences more precipitation—97 mm (3.8 in) spread over 14 days—and the humidity rises to 90%, making it feel quite damp and chilly. For a detailed look at January conditions, you can visit Saint Helier weather in January.
August and February present contrasting weather patterns. In August, temperatures are considerably warmer, ranging from a minimum of 14°C (57°F) to a pleasant maximum of 25°C (78°F), with an average temperature of 18°C (64°F). While there are some rainy days in August, with a total precipitation of 66 mm (2.6 in) over 13 days, humidity levels are lower at 73%. In stark contrast, February experiences much cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 13°C (56°F), averaging only 8°C (47°F). This month is also wetter, receiving 90 mm (3.5 in) of precipitation over 16 days, and higher humidity at 89%. For a closer look at February's weather, you can visit Saint Helier weather in February.
August and March present quite contrasting weather conditions. In August, temperatures range from a comfortable 14°C (57°F) to a warm 25°C (78°F), with an average of 18°C (64°F) and relatively lower precipitation of 66 mm (2.6 in) over 13 days. In contrast, March experiences much cooler temperatures, with a minimum of -2°C (29°F) and a maximum of 14°C (58°F), averaging just 9°C (48°F). Additionally, March sees more precipitation, totaling 84 mm (3.3 in) across 15 days, along with higher humidity at 86%. For more detailed information about March weather, visit Saint Helier weather in March.
When comparing the weather in August and April, notable differences emerge. August typically enjoys warmer temperatures, with averages around 18°C (64°F) and maximums reaching 25°C (78°F), while April's temperatures are more moderate, averaging only 10°C (51°F) with a maximum of 17°C (62°F). Precipitation also varies; August sees around 66 mm (2.6 in) of rain over 13 days, compared to April's 36 mm (1.4 in) over just 8 days. Additionally, April is marked by higher humidity levels at 84%, whereas August has a slightly lower humidity of 73%. For more detailed information on April weather, check the link: Saint Helier weather in April.
In comparing the weather of August and May, August tends to be warmer with temperatures ranging from a minimum of 14°C (57°F) to a maximum of 25°C (78°F), while May sees cooler temperatures, with a minimum of 7°C (46°F) and a maximum of 20°C (69°F). The average temperature in August is also higher at 18°C (64°F) compared to May's 13°C (55°F). Both months experience similar levels of precipitation, with August receiving 66 mm (2.6 in) over 13 days and May slightly less at 63 mm (2.5 in) over 10 days. However, May has a higher humidity level at 80%, compared to August's 73%. For more insights into May’s weather, you can visit Saint Helier weather in May.
In comparing the weather in August and June, August tends to be slightly warmer, with average temperatures ranging from a minimum of 14°C (57°F) to a maximum of 25°C (78°F), while June has a cooler average, with minimum temperatures of 11°C (53°F) and maximums reaching 24°C (76°F). Both months experience significant precipitation, but June is slightly wetter with 71 mm (2.8 in) over 10 days compared to August's 66 mm (2.6 in) over 13 days. Additionally, humidity levels are higher in June at 80%, compared to August's 73%. For more detailed information, you can check Saint Helier weather in June.
In comparison to July, August tends to have slightly warmer temperatures with an average of 18°C (64°F), as opposed to July's average of 17°C (63°F). While both months have similar minimum temperatures around 14°C, August has a lower maximum temperature, peaking at 25°C (78°F) compared to July's 27°C (80°F). Precipitation is more frequent in August, recorded on 13 days with a total of 66 mm (2.6 in), compared to 9 days and 47 mm (1.9 in) in July. Additionally, humidity levels are higher in August at 73%, compared to 69% in July. For more detailed weather information, visit Saint Helier weather in July.
August and September bring slightly cooler temperatures as summer transitions to fall, with August featuring a minimum of 14°C (57°F), an average of 18°C (64°F), and a maximum of 25°C (78°F). In contrast, September sees a drop in temperatures, with minimums of 12°C (54°F), averages of 17°C (63°F), and maximums reaching 23°C (75°F). While August experiences 66 mm (2.6 in) of precipitation over 13 days, September has slightly higher rainfall at 82 mm (3.2 in) across 11 days. The humidity also increases, from 73% in August to 79% in September, indicating a more humid feel as summer gives way to autumn. For more detailed weather information, check out Saint Helier weather in September.
August and October present quite different weather patterns. In August, temperatures are generally warmer, with averages around 18°C (64°F) and a maximum of 25°C (78°F), while October sees cooler conditions, averaging just 15°C (59°F) with a maximum of 20°C (69°F). Precipitation also varies significantly; August experiences 66 mm (2.6 in) over 13 days, whereas October receives a much higher total of 157 mm (6.2 in) across 19 days. Additionally, humidity rises from 73% in August to 89% by October, contributing to a much more damp and overcast atmosphere. For more details on the weather specifics, check out Saint Helier weather in October.
August and November present two distinctly different weather patterns. In August, temperatures are generally warmer, with averages around 18°C (64°F) and maximums reaching 25°C (78°F), while November sees much cooler readings, with averages dropping to 12°C (53°F) and maximums only reaching 17°C (62°F). Furthermore, November experiences significantly more precipitation, with 125 mm (4.9 in) falling over 18 days compared to August's 66 mm (2.6 in) over just 13 days. The humidity also increases in November, peaking at 92%, compared to August's 73%. For a detailed look at November's weather, you can explore Saint Helier weather in November.
August and December present notably contrasting weather patterns. In August, temperatures range from a minimum of 14°C (57°F) to a maximum of 25°C (78°F), with an average of 18°C (64°F). The month typically experiences 66 mm (2.6 in) of precipitation over approximately 13 days, accompanied by a humidity level of 73%. In stark contrast, December's weather is significantly cooler, with temperatures ranging from a chilly 3°C (38°F) to a maximum of 14°C (57°F) and an average of just 10°C (50°F). Additionally, December is much wetter, with 185 mm (7.3 in) of precipitation spread over 22 days and humidity soaring to 92%. For more detailed insights, check out Saint Helier weather in December.
August in Saint Helier showcases a delightful blend of warm temperatures and moderate humidity, making it a standout month compared to the rest of the year. With maximum temperatures often reaching a pleasant 25°C, the summer warmth is palpable, even as the average hovers around a comfortable 18°C. While rainfall does occur, with about 13 days experiencing light showers throughout the month, this precipitation is generally manageable and contributes to the lush coastal landscapes. Overall, August offers a charming balance of sunny days and refreshing breezes, inviting visitors to explore the beauty of the island. For more insights into the climate throughout the year, check out Saint Helier Climate.