March Weather in Saint Helens, United States

Last updated: February 24, 2025

March weather in Saint Helens, United States brings a mix of mild temperatures and considerable precipitation, setting the stage for the transition into spring. With a maximum temperature reaching 22°C (73°F) and an average of 7°C (45°F), residents experience a notable range, while the minimum dips to around -3°C (27°F), reminding everyone that winter's chill lingers. This month, precipitation totals around 163 mm (6.4 in) over approximately 18 days, and the humidity levels soar to 85%, creating a damp atmosphere that fuels the lush greenery characteristic of the region. Whether you’re an outdoor enthusiast or simply enjoying the cozy indoors, March serves as a prelude to the vibrant growth of spring.

March Temperature in Saint Helens

In March, Saint Helens, United States, begins to shake off the chill of winter, offering a marked transition in temperatures. The month kicks off with a minimum of -3°C (27°F), gradually warming to an average of 7°C (45°F) and a pleasant maximum of 22°C (73°F) by the end. This notable increase reflects a broader trend of rising temperatures as spring approaches, showcasing an uplifting shift from February's cooler averages. As the region transitions from the frosty grasp of winter to the budding warmth of spring, the evolving climate invites residents and visitors alike to embrace outdoor activities and enjoy the blossoming scenery.

March Weather in Saint Helens: Daily Temperature Highs, Lows, and Averages

The chart illustrates March temperature patterns in Saint Helens, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414045505762676963524540
Data source: Temperature data for Saint Helens generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

March Precipitation in Saint Helens

March in Saint Helens marks a transitional period in the rainfall pattern, as precipitation begins to taper off from the winter months. This month experiences 163 mm (6.4 in) of rain over 18 days, showing a slight decrease from the wetter conditions of the previous two months, both of which recorded 205 mm (8.1 in). As spring approaches, the days become less wet, with March's totals paving the way for the drier conditions expected in April, which sees a further drop to 140 mm (5.5 in). This trend highlights the gradual shift from the intense winter rains to the milder spring showers, creating a rich and dynamic climate that nourishes the region's lush landscapes.

March Precipitation Trends in Saint Helens

The chart displays monthly precipitation patterns in Saint Helens, with values for each month alongside March's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec205205163140736291190149209224
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Saint Helens

In March, Saint Helens experiences a humidity level of 85%, mirroring the slightly damp conditions of January and February. This consistency reflects the region's typically moist early spring climate, which gradually gives way to a slight decrease in humidity as the months progress. By April and May, humidity dips to 83%, indicating the onset of warmer weather while still maintaining a relatively high moisture content in the air. Notably, the trend showcases a gradual decline toward summer, with July and August dropping to 82% and 74% respectively, marking a shift towards drier conditions. Overall, March serves as a pivotal month, bridging the winter's humidity and the drier summer months ahead.

March Average Humidity in Saint Helens

This chart illustrates the average monthly humidity levels in Saint Helens, with March's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how March's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Saint Helens

As March unfolds in Saint Helens, United States, residents experience a noticeable shift in the UV Index, which climbs to 5—indicating a moderate exposure level. This is a significant increase from January's low index of 2 and February's 3, reflecting the approach of spring and more intense sunlight. With a burn time of 30 minutes, it's essential to be mindful of sun protection as outdoor activities become more common. Looking ahead, April anticipates an even higher index of 6, marking the transition to a high exposure category and reminding us to stay vigilant as we march toward the sunnier months. For more details, check out the complete Saint Helens UV Index.

Maximum UV Index Levels in Saint Helens for March

The chart shows the monthly maximum UV Index (UVI) for Saint Helens in March, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec23569101087532
Data source: Saint Helens March UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

March Sunshine in Saint Helens

As March unfolds in Saint Helens, the days grow noticeably brighter, with 195 hours of sunshine illuminating the landscape—a remarkable increase from January's 88 hours. This surge heralds the arrival of spring, setting the stage for even more radiant months ahead. The progression continues into April with 229 hours, capturing the essence of renewal and growth. Notably, each subsequent month showcases a consistent upward trend, culminating in the sun-soaked heights of 374 hours in July. This seasonal dance not only enhances the vibrancy of the community but also invites residents and visitors alike to bask in the warmth and beauty of the Pacific Northwest, as the sunshine swells into a glorious summer.

Monthly Sunshine Duration in Saint Helens: March Highlighted

The March sunshine duration represents the total number of hours Saint Helens experiences direct sunlight during the month of March, excluding cloudy or obstructed periods. This chart compares the sunshine duration of March with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec88h123h195h229h282h318h374h335h268h211h136h115h
Data source: Saint Helens March Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Saint Helens During March

As winter fades and spring approaches, Saint Helens, United States, sees a noticeable increase in the likelihood of sunny weather during March, with a 35% chance of sunshine. This marks a significant rise compared to the dreary winter months of January and February, both sitting at a modest 15%. The upward trend continues into April, where the chance of clear skies jumps to 53%, indicating that brighter days are just around the corner. As the sunny season takes hold, the gradual transition from the low light of winter to the invigorating sun of spring showcases the region's evolving climate, making March a month of promise for those craving sunlight.

Percentage of Sunny Days in March in Saint Helens

The chart illustrates the percentage of sunny days in Saint Helens throughout the year, with March highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Saint Helens experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec15%15%35%53%38%61%73%55%49%28%14%12%
Data source: Saint Helens March chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Saint Helens in March

As March unfolds in Saint Helens, the days begin to lengthen noticeably, with daylight extending to an invigorating 11 hours. This increase of an hour from February signals the approach of spring, with daylight gradually rising to 13 hours in April and peaking at 15 hours during the summer months of June and July. The trend is clear: each month brings a brighter, more luminous atmosphere, awakening the natural beauty of the region. While daylight hours gradually decrease again in the fall, the anticipation of longer, sunlit days in spring ignites a sense of renewal and excitement for outdoor activities.

Average Daylight Hours in Saint Helens for March

The chart illustrates the variation in daylight duration in Saint Helens throughout the year, with March highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 7m10h 23m11h 57m13h 34m14h 56m15h 38m15h 15m14h 1m12h 28m10h 51m9h 27m8h 43m
Data source: Saint Helens daylight hours, calculated by summing the hours between sunrise and sunset for each day.

March Winds in Saint Helens

In March in Saint Helens, average wind speeds dip slightly to 2.2 m/s (5 mph), showcasing a typical transition as winter begins to yield to spring. This reduction follows a consistent pattern observed since January, where wind speeds hovered at 2.5 m/s before gently declining in both February and March. As the region prepares for the warmer months, residents can expect a slight increase again in May and July, where wind speeds refresh at 2.5 m/s and 2.7 m/s, respectively. Overall, the wind patterns in March indicate a calming before the lively breezes of summer, inviting a sense of tranquility amidst the changing seasons.

Average March Wind Speed in Saint Helens

The chart displays monthly wind speed patterns in Saint Helens, with values for each month shown alongside March's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how March's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.52.52.2 m/s2.12.52.22.72.42.22.62.72.5
Data source: Saint Helens March wind data, generated using information from the Copernicus Climate Change Service.

How March Weather in Saint Helens Compares to Other Months

The weather in Saint Helens changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of March'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.

In comparing the weather of March and January, we see distinct differences. March typically experiences milder temperatures, with a minimum of -3°C (27°F) and an average of 7°C (45°F), reaching a maximum of 22°C (73°F). In contrast, January is significantly colder, with temperatures ranging from a minimum of -14°C (7°F) to a maximum of 14°C (58°F), averaging around 5°C (41°F). Precipitation is notable in both months, though January records slightly more at 205 mm (8.1 in) across 17 days compared to March's 163 mm (6.4 in) over 18 days. Humidity remains consistent at 85% for both months, contributing to the overall dampness experienced during this period. For more details on January weather, you can visit Saint Helens weather in January.

March generally shows a notable increase in temperature compared to February, with average daily highs rising from 4°C (40°F) in February to 7°C (45°F) in March, and max temperatures reaching up to 22°C (73°F). Despite this warming trend, March experiences slightly less precipitation, measuring 163 mm (6.4 in) over 18 days, compared to 205 mm (8.1 in) over 20 days in February. Humidity remains relatively consistent, hovering around 85% in March and slightly lower at 84% in February. For more detailed insights on February's weather patterns, you can visit Saint Helens weather in February.

March and April weather presents a noticeable transition as spring unfolds. In March, temperatures range from a chilly minimum of -3°C (27°F) to a warmer maximum of 22°C (73°F), with an average of 7°C (45°F). The month is quite wet, experiencing 163 mm (6.4 in) of precipitation over 18 days and maintaining a high humidity level of 85%. In contrast, April sees a slight increase in average temperature to 10°C (51°F), with a minimum of -1°C (30°F) and a maximum reaching 29°C (85°F). Although precipitation decreases to 140 mm (5.5 in) over 16 days, humidity remains slightly lower at 83%. This progression indicates a shift toward warmer and drier conditions, marking the arrival of spring. For more specifics on April weather, you can visit Saint Helens weather in April.

March and May present a notable contrast in weather conditions. In March, temperatures can drop as low as -3°C (27°F) and peak at 22°C (73°F), with an average of 7°C (45°F). This month is marked by significant precipitation, receiving 163 mm (6.4 in) over 18 days, contributing to a relatively high humidity of 85%. In contrast, May experiences more mild and pleasant temperatures, with minimums of 3°C (37°F) and maximums reaching 32°C (90°F), averaging around 14°C (57°F). Precipitation in May drops to 73 mm (2.9 in) over 11 days, resulting in slightly lower humidity levels at 83%. For more detailed information about May weather, check out Saint Helens weather in May.

In comparing the weather of March and June, notable differences in temperature and precipitation emerge. March features a broader temperature range with minimums dipping to -3°C (27°F) and a maximum reaching up to 22°C (73°F), while the average temperature is cooler at around 7°C (45°F). In contrast, June presents milder temperatures, with a minimum of 6°C (43°F) and a soaring maximum of 45°C (113°F), leading to a significantly warmer average of 17°C (63°F). Additionally, March is much wetter, receiving 163 mm (6.4 in) of precipitation over 18 days, compared to June's lighter 62 mm (2.5 in) over just 9 days. Humidity levels remain fairly consistent, with March at 85% and June at 83%. For more detailed information, you can check Saint Helens weather in June.

March and July present contrasting weather patterns in Saint Helens. March experiences cooler temperatures, with a minimum of -3°C (27°F) and an average of 7°C (45°F), while July boasts warmer conditions with a minimum of 8°C (46°F) and an average of 20°C (68°F). Precipitation is notably higher in March, receiving 163 mm (6.4 in) over 18 days, compared to the much drier July, which sees only 9 mm (0.3 in) over just 2 days. Humidity levels remain relatively similar, with March at 85% and July a bit lower at 82%. For a deeper look at July’s climate, check out Saint Helens weather in July.

March and August present contrasting weather conditions, reflecting the shift from winter to summer. In March, temperatures range from a chilly -3°C (27°F) at their lowest to a mild 22°C (73°F) at their highest, with an average temperature of 7°C (45°F). The month is characterized by frequent precipitation, totaling 163 mm (6.4 in) over 18 days, contributing to a high humidity level of 85%. In stark comparison, August offers warmer conditions with a minimum temperature of 8°C (47°F), an average of 20°C (69°F), and a maximum that can soar up to 39°C (102°F). Precipitation drops dramatically to just 11 mm (0.4 in) over only 2 days, and humidity decreases to 74%. For more detailed information, you can visit Saint Helens weather in August.

March and September showcase distinctly different weather patterns. In March, temperatures can dip as low as -3°C (27°F) and reach a maximum of 22°C (73°F), with an average temperature of 7°C (45°F). The month is characterized by high humidity at 85% and substantial precipitation of 163 mm (6.4 in) over 18 days. In contrast, September enjoys milder temperatures, starting from a minimum of 6°C (43°F) and climbing to a maximum of 35°C (95°F), with an average of 17°C (63°F). This month is considerably drier, with only 90 mm (3.6 in) of rain falling over just 9 days and lower humidity at 71%. For more details, you can check Saint Helens weather in September.

March and October present contrasting weather patterns, with each month showcasing a unique climate. In March, temperatures range from a chilly -3°C (27°F) minimum to a pleasant maximum of 22°C (73°F), averaging around 7°C (45°F). This month is characterized by higher precipitation, with 163 mm (6.4 in) falling over 18 days and humidity levels reaching 85%. In contrast, October experiences a milder temperature range, with a minimum of -2°C (29°F) and a maximum of 26°C (78°F), averaging 11°C (52°F). Although slightly less rain is recorded at 149 mm (5.9 in) over 13 days, October's humidity is a bit lower at 81%. For more specific insights on October weather, you can refer to Saint Helens weather in October.

Both March and November exhibit similar minimum temperatures of -3°C (27°F) and average temperatures around 7°C (45°F). However, March tends to have a slightly higher maximum temperature of 22°C (73°F) compared to November's 18°C (64°F). Precipitation levels are notably different, with March receiving 163 mm (6.4 in) over 18 days, while November sees an increase to 209 mm (8.2 in) across the same number of days. Humidity levels are also quite close, with March at 85% and November at 87%. For a deeper dive into the weather patterns, check out Saint Helens weather in November.

March and December exhibit notable differences in weather patterns. In March, temperatures range from a minimum of -3°C (27°F) to a maximum of 22°C (73°F), averaging around 7°C (45°F), while December’s temperatures are cooler, with a minimum of -5°C (23°F) and a maximum of 15°C (59°F), averaging 5°C (41°F). Precipitation levels also vary, with March receiving 163 mm (6.4 in) over 18 days, compared to December's higher total of 224 mm (8.8 in) over 20 days. Additionally, humidity remains similar in both months, with March at 85% and December slightly higher at 87%. For more on December weather specifics, visit Saint Helens weather in December.

Compare Saint Helens's Climate with Cities Worldwide

Conclusion: What to Expect From March Weather in Saint Helens

As March ushers in the arrival of spring, Saint Helens experiences a refreshing shift in weather compared to the winter months. While daytime temperatures can reach a pleasant 22°C (73°F), the overall average remains cool at 7°C (45°F). March is also marked by increased precipitation, with rain gracing the area on 18 days, contributing to a total of 163 mm (6.4 in) for the month. Despite the chill, the high humidity at 85% creates a unique and invigorating atmosphere, paving the way for the lush blooms of spring. Learn more about what to expect in this transitional month by exploring the full details at Saint Helens Climate.