Last updated: February 24, 2025
In Saint Helens, United States, May embraces a unique climate characterized by a wide temperature range, with maximum highs reaching 32°C (90°F) and minimum lows dipping to 3°C (37°F). The average temperature settles around a pleasant 14°C (57°F), creating an inviting atmosphere for outdoor activities. However, residents should be prepared for some damp days, as the area experiences approximately 73 mm (2.9 in) of rain over 11 days, contributing to a high humidity level of 83%. This blend of warmth and moisture sets the stage for a vibrant spring environment, perfect for enjoying the lush landscapes that dominate the region.
In Saint Helens, United States, May marks a distinct shift towards warmer temperatures as spring reaches its peak. The month typically begins with a minimum temperature of around 3°C (37°F), gradually rising to a pleasant average of 14°C (57°F). Residents can enjoy highs that often soar to 32°C (90°F), revealing the burgeoning vitality of the season. Compared to the cooler months of early spring, where temperatures hovered around zero, May's warmth not only invites outdoor activities but also hints at the approaching summer heat. This steady rise from the chill of winter to the mild comforts of late spring underscores the region's dynamic climate, making it an ideal time for exploration and adventure.
In May, Saint Helens experiences a notable shift in weather patterns, with precipitation levels significantly dropping to just 73 mm (2.9 in), the lowest for the year thus far. This decrease is accompanied by a reduction in precipitation days, averaging around 11 compared to earlier months, indicating a transition towards drier conditions as summer approaches. The earlier months of the year, particularly January and February, show substantial rainfall exceeding 200 mm each, highlighting a trend of wetter winters that gradually tapers off into the late spring. As the region moves into the drier summer months, this May serves as a pivotal point, reflecting the gradual decline in both the amount and frequency of rainfall.
In May, the humidity in Saint Helens, United States, settles at 83%, consistent with the preceding months of April and June. This mild humidity level is part of a gradual decline observed from the winter's higher percentages, which hover around 85-87% in the early months of the year. As spring unfolds into summer, humidity levels will continue to drop, reaching their lowest point in August at 74%. This trend reflects a transition from the damp, cool days of winter and early spring to the drier and warmer conditions of summer, making May a sweet spot for those who appreciate comfortable humidity levels before the summer heat sets in.
As spring transitions into summer, May in Saint Helens, United States, marks a significant uptick in ultraviolet (UV) radiation, with a UV Index soaring to 9—categorized as very high. This sharp increase from April's UV Index of 6 indicates that outdoor enthusiasts must pay extra attention, as the burn time decreases to just 15 minutes. Compared to the earlier months, where the UV Index remained in the low to moderate range, May necessitates diligent sun protection practices. As the sun becomes increasingly intense, taking precautions is essential to enjoy the beautiful outdoors safely. For more detailed information, visit Saint Helens UV Index.
UV Risk Categories
As May arrives in Saint Helens, the days stretch longer and sunnier, bringing a delightful embrace of warmth and light. With 282 hours of sunshine, May marks a significant leap from the earlier months, showcasing an upward trend that culminates in the radiant brilliance of summer. This month serves as a charming transition, setting the stage for the peak sunshine of July, which boasts an impressive 374 hours. As the year progresses, sunshine hours gradually decline, yet May’s vibrant burst of sunlight leaves residents and visitors alike basking in the essence of spring, encouraging outdoor adventures and blossoming connections.
In May, Saint Helens, United States, offers a 38% chance of sunny weather, marking a slight dip from the previous month's 53% likelihood in April. This decrease is part of a broader trend where sunny days become more common as the year progresses, peaking in the summer with a 73% chance in July. While May may not boast the highest levels of sunlight, it still presents a significant improvement compared to the winter months, where the chances linger around a meager 15%. As spring unfolds, residents and visitors alike can anticipate more opportunities to enjoy the outdoors, even as the likelihood of sunshine begins to wane slightly before the summer heat arrives.
As spring unfolds in Saint Helens, daylight duration begins to extend, showcasing a delightful trend towards longer days. Starting with 9 hours in January, daylight gradually increases, reaching 11 hours by March. The arrival of April brings significant changes, as daylight stretches to 13 hours, signaling the onset of longer, sunnier days. May continues this upward trajectory, offering an impressive 14 hours of daylight, which sets the stage for a peak in June at 15 hours. This luscious abundance of light gradually wanes in the following months, with August reverting to 14 hours, before transitioning back to more subdued days in September and October. By the end of the year, daylight dips back to 8 hours in December, completing the cycle of natural light that governs the vibrant seasons in this charming region.
In Saint Helens, the month of May brings a refreshing breeze, with an average wind speed of 2.5 m/s (6 mph), mirroring January's calm winds. This consistency in wind speed hints at a gentle transition into summer, as the weather warms up and outdoor activities become more inviting. Notably, while March and April experience slightly lower speeds, the wind picks up again in July at 2.7 m/s (6 mph), indicating a trend of increasing breeziness heading into the height of summer. Overall, May's moderate gusts create a delightful atmosphere, perfect for enjoying the beauty of the Pacific Northwest while foreshadowing a lively summer ahead.
The weather in Saint Helens changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Saint Helens and find detailed weather information for every month.
May and January present strikingly different weather patterns. In May, temperatures range from a chilly 3°C (37°F) to a warm 32°C (90°F), with an average of 14°C (57°F). The month sees moderate precipitation at 73 mm (2.9 in) across about 11 days, and humidity remains relatively high at 83%. In contrast, January has much colder temperatures, with minimums plunging to -14°C (7°F) and a maximum of only 14°C (58°F), averaging around 5°C (41°F). The winter month experiences more significant rainfall, totaling 205 mm (8.1 in) over 17 days, with humidity slightly higher at 85%. For more detailed insights on January weather, visit Saint Helens weather in January.
May and February present contrasting weather conditions. In May, temperatures range from a mild minimum of 3°C (37°F) to a warm maximum of 32°C (90°F), making it a much sunnier month with an average temperature of 14°C (57°F). However, it experiences moderate rainfall, with 73 mm (2.9 in) of precipitation over 11 days and relatively high humidity at 83%. In contrast, February is colder, with temperatures varying from a low of -7°C (19°F) to a high of just 17°C (62°F) and an average of 4°C (40°F). This month is considerably wetter, receiving 205 mm (8.1 in) of precipitation over 20 days, and maintains a similar humidity level at 84%. For more details on February's climate, visit Saint Helens weather in February.
The weather in May is notably warmer and drier compared to March. May typically sees temperatures ranging from a minimum of 3°C (37°F) to a maximum of 32°C (90°F), with an average of 14°C (57°F) and only 73 mm (2.9 in) of precipitation over 11 days. In contrast, March experiences much cooler temperatures, with a minimum of -3°C (27°F), an average of 7°C (45°F), and a maximum of 22°C (73°F). Additionally, March receives a significantly higher rainfall of 163 mm (6.4 in) across 18 days, resulting in a higher humidity level of 85%. For more detailed information on March weather, you can visit Saint Helens weather in March.
May generally presents warmer temperatures compared to April, with minimums starting at 3°C (37°F) compared to April's chilly -1°C (30°F). The average temperature in May climbs to 14°C (57°F), while April has an average of 10°C (51°F), and both months experience similar maximum temperatures, with May peaking at 32°C (90°F) and April reaching 29°C (85°F). Interestingly, April has more precipitation, totaling 140 mm (5.5 in) over 16 days, whereas May sees less rain at 73 mm (2.9 in) over 11 days, despite both months maintaining a consistent humidity level of 83%. For a more detailed look at April's conditions, visit Saint Helens weather in April.
May and June both experience warm temperatures, but June tends to be slightly warmer overall. In May, temperatures range from a minimum of 3°C (37°F) to a maximum of 32°C (90°F), with an average temperature of 14°C (57°F). In contrast, June starts off warmer with a minimum of 6°C (43°F) and can soar to a scorching maximum of 45°C (113°F), averaging around 17°C (63°F). Precipitation also differs slightly, with May receiving 73 mm (2.9 in) over 11 days compared to June's 62 mm (2.5 in) across 9 days. Both months share a high humidity level of 83%, contributing to a muggy atmosphere. For more details on the weather in June, you can check Saint Helens weather in June.
In May, the weather in Saint Helens showcases a wider temperature range, with minimums dipping to 3°C (37°F) and maximums reaching up to 32°C (90°F). The average temperature sits at about 14°C (57°F), alongside a significant amount of rainfall, accumulating 73 mm (2.9 in) over 11 days, contributing to a high humidity level of 83%. In contrast, July presents a warmer climate with minimum temperatures starting at 8°C (46°F) and maximums soaring to 37°C (99°F), resulting in a more pleasant average of 20°C (68°F). Additionally, July experiences much lower precipitation, totaling just 9 mm (0.3 in) over 2 days, and maintaining a similar humidity level of 82%. For a more detailed look at July's weather, you can refer to this link: Saint Helens weather in July.
May and August present distinct contrasts in weather. In May, temperatures range from a cool 3°C (37°F) at night to a warm 32°C (90°F) during the day, with an average of 14°C (57°F). The month experiences considerable precipitation of 73 mm (2.9 in) over 11 days, contributing to high humidity levels at 83%. In comparison, August enjoys milder conditions, with nighttime minima at 8°C (47°F) and daytime highs reaching up to 39°C (102°F), averaging 20°C (69°F). Rain is considerably less frequent in August, totaling only 11 mm (0.4 in) over just 2 days, and the humidity drops to a more comfortable 74%. For more details on the weather in August, check out Saint Helens weather in August.
In comparing the weather between May and September, we observe noticeable differences in temperature and precipitation patterns. May experiences a minimum temperature of 3°C (37°F) and an average of 14°C (57°F), with maximums reaching up to 32°C (90°F). In contrast, September starts with slightly warmer minimums at 6°C (43°F) and an average of 17°C (63°F), peaking at a higher maximum of 35°C (95°F). Precipitation is also more prominent in September, with 90 mm (3.6 in) recorded over 9 days, compared to May's 73 mm (2.9 in) over 11 days. Humidity levels are higher in May at 83%, while September sees a decrease to 71%. For more details, you can visit Saint Helens weather in September.
May and October present distinct contrasts in weather patterns. In May, temperatures range from a minimum of 3°C (37°F) to a maximum of 32°C (90°F), with an average of 14°C (57°F), while October experiences cooler conditions, with temperatures ranging from -2°C (29°F) to 26°C (78°F) and an average of 11°C (52°F). Precipitation is also notably higher in October, accumulating to 149 mm (5.9 in) over 13 days, compared to May's 73 mm (2.9 in) over 11 days. Despite the increased rainfall in October, humidity levels remain relatively similar with May at 83% and October at 81%. For a more detailed look at October weather, visit Saint Helens weather in October.
May and November showcase contrasting weather patterns that highlight the transition from spring to late autumn. In May, temperatures range from a mild 3°C (37°F) at night to a warm 32°C (90°F) during the day, with an average of 14°C (57°F). The month sees moderate rainfall of 73 mm (2.9 in) over about 11 days, accompanied by a relatively high humidity of 83%. In stark contrast, November experiences cooler temperatures, with nighttime lows dropping to -3°C (27°F) and daytime highs capping at 18°C (64°F), averaging 7°C (46°F). Precipitation is notably higher at 209 mm (8.2 in), spread over 18 days and with humidity peaking at 87%. For a deeper look into the specifics of November weather, you can check out Saint Helens weather in November.
When comparing the weather in May and December, there is a notable contrast in temperature and precipitation. In May, temperatures range from a mild 3°C (37°F) to a warm 32°C (90°F), bringing an average of 14°C (57°F) and relatively low precipitation of 73 mm (2.9 in) over 11 days. The humidity is also relatively high at 83%, creating a comfortable atmosphere. In contrast, December experiences much colder temperatures, with a minimum of -5°C (23°F) and a maximum of 15°C (59°F), leading to a much lower average of 5°C (41°F). Additionally, December is significantly wetter, receiving 224 mm (8.8 in) of rain over 20 days and slightly higher humidity at 87%. For a detailed look at December weather, you can check Saint Helens weather in December.
As May unfolds in Saint Helens, the weather begins to shift noticeably from the chill of earlier months, offering a delightful glimpse of summer. With a pleasant average temperature that hovers around 14°C (57°F), the days feel warmer, contrasting sharply with the crisper conditions of winter and early spring. While one may still encounter occasional rain, with about 73 mm of precipitation over 11 days, the humidity is relatively high at 83%, adding to the lush greenery and vibrant blooms characteristic of this season. Such conditions make May a picturesque time to appreciate the natural beauty of Saint Helens, as it transitions into the warmer months ahead. For a deeper understanding of the seasonal variations and their impacts, explore the detailed insights on Saint Helens Climate.