August Weather in Saint Helens, United States

Last updated: February 24, 2025

In Saint Helens, United States, August presents a dynamic blend of weather patterns marked by a maximum temperature of 39°C (102°F), an average of 20°C (69°F), and a refreshing minimum of 8°C (47°F). This month experiences only 11 mm (0.4 in) of precipitation, spread over just 2 days, making it predominantly dry. However, the air carries a notable humidity level of 74%, creating a warm and sometimes muggy atmosphere. Whether you're exploring the outdoors or relaxing indoors, August in Saint Helens offers a unique blend of heat and occasional respite.

August Temperature in Saint Helens

In August, Saint Helens experiences a delightful peak in summer warmth, characterized by a minimum temperature of 8°C (47°F) and an average of 20°C (69°F). With maximum temperatures soaring up to a sizzling 39°C (102°F), this month stands out as a time for outdoor activities and enjoying the vibrant natural beauty of the area. The warmth of August is a fitting culmination of a gradually rising trend throughout the summer months, beginning with cooler January temperatures of -14°C (7°F). As the seasons progress, temperatures steadily climb, showcasing a significant shift in climate that invites residents and visitors alike to revel in the sun-drenched days of late summer. This consistent increase in both average and peak temperatures underscores Saint Helens' seasonal character, making August a perfect time to embrace the great outdoors.

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

The chart illustrates August 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.

August Precipitation in Saint Helens

In August, Saint Helens experiences a notable lull in precipitation, receiving only 11 mm (0.4 in) across just 2 days. This minor rainfall follows the peak wet months of January through April, where precipitation often exceeds 140 mm. As the summer progresses, the region dries out significantly, with July recording a mere 9 mm (0.3 in), marking the driest month of the year. However, August's light showers hint at a transition toward the wetter fall months ahead, with September's precipitation expected to jump to 90 mm (3.6 in). The patterns clearly illustrate a significant dip in moisture during the height of summer, making the end of August a brief pause before the autumn rains return with a vengeance.

August Precipitation Trends in Saint Helens

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

August marks a noticeable shift in humidity levels in Saint Helens, United States, dropping to 74%, the lowest for the year. This decline in moisture is part of a broader trend observed throughout the summer months, as July also shows a decrease with 82% humidity. In contrast, the beginning of the year is characterized by high humidity levels, consistently hovering around 85% from January to March. As the seasons transition, humidity levels rise again in late fall and winter, peaking at 87% in November and December. This rhythmic fluctuation not only underscores the region's temperate climate but also highlights August as a brief reprieve from the otherwise moist conditions of the year.

August Average Humidity in Saint Helens

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

August UV Index in Saint Helens

In August, Saint Helens, United States, experiences a UV Index of 8, placing it firmly in the very high exposure category, which means that sun protection is essential to avoid harmful UV effects. With a burn time of just 15 minutes, it's crucial for residents and visitors alike to be mindful of their time outdoors, especially as the summer sun continues to shine brightly. This month's UV levels reflect a slight decrease from the peak summer months of June and July, which both recorded a UV Index of 10, yet still demand attention to skin safety. As we transition into the fall, September's UV Index is projected to drop to 7, indicating a gradual reduction in UV exposure. For more details on UV levels throughout the year, check the comprehensive guide here: Saint Helens UV Index.

Maximum UV Index Levels in Saint Helens for August

The chart shows the monthly maximum UV Index (UVI) for Saint Helens in August, 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 August 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.

August Sunshine in Saint Helens

August in Saint Helens, United States, showcases a vibrant tapestry of summer sunshine, with an impressive 335 hours of sunshine basking the land. This month, while slightly less radiant than July's peak of 374 hours, still represents a significant contribution to the overall warmth of the season. Following the flourishing spring months, where sunshine steadily increased from 88 hours in January to 282 hours in May, August signals a gradual transition into early autumn, as the daylight hours begin to wane. The sun-drenched days of summer linger a little longer, providing residents and visitors alike with ample opportunities to revel in outdoor delights before the cooler months arrive.

Monthly Sunshine Duration in Saint Helens: August Highlighted

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

Chance of Sun in Saint Helens During August

In Saint Helens, August offers a 55% chance of sunny weather, making it one of the more promising months for outdoor activities. This likelihood reflects a notable trend towards warmer and sunnier conditions, building from a mere 15% in January to a peak 73% by July. As summer reaches its zenith, the skies remain predominantly clear, although the percentage dips slightly as August transitions towards autumn. This pattern highlights the region's shift from the gray, overcast winter months to the more vibrant and sunny summer days, inviting residents and visitors alike to bask in the warmth of the late summer sun.

Percentage of Sunny Days in August in Saint Helens

The chart illustrates the percentage of sunny days in Saint Helens throughout the year, with August 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 August chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Saint Helens in August

In Saint Helens, United States, the daylight duration follows a clear seasonal rhythm throughout the year. Starting from just 9 hours in January, the days gradually lengthen as spring unfolds, peaking at 15 hours in June and July. This summer abundance of light begins to taper off in August, where the daylight averages 14 hours, providing a perfect balance between warmth and evening activities. As the year transitions into fall, daylight dwindles to 12 hours in September and further decreases to 10 hours in October, making way for the shorter days of winter, which see only 8 hours in December. This cyclical pattern not only enhances the natural beauty of each season but also offers residents a diverse range of outdoor experiences throughout the year.

Average Daylight Hours in Saint Helens for August

The chart illustrates the variation in daylight duration in Saint Helens throughout the year, with August 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.

August Winds in Saint Helens

In Saint Helens, August brings a gentle breeze, with an average wind speed of 2.4 m/s (5 mph). This leisurely wind is typical for the month, aligning closely with the patterns established earlier in the year. Throughout the first half of the year, wind speeds fluctuate modestly, peaking in July at 2.7 m/s (6 mph), just before August's slight dip. Interestingly, from August onward, the winds begin to show a gradual uptick, particularly in the fall months. October and November see an increase back to 2.6 m/s and 2.7 m/s respectively, signaling a transition into a windier season. Overall, August's breeze offers a serene yet dynamic experience, perfectly encapsulating the shifting seasons of Saint Helens.

Average August Wind Speed in Saint Helens

The chart displays monthly wind speed patterns in Saint Helens, with values for each month shown alongside August's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how August's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.52.52.22.12.52.22.72.4 m/s2.22.62.72.5
Data source: Saint Helens August wind data, generated using information from the Copernicus Climate Change Service.

How August 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 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 Helens and find detailed weather information for every month.

August and January present a stark contrast in weather patterns. In August, temperatures can soar to a maximum of 39°C (102°F) with an average of 20°C (69°F), while January brings much colder conditions with highs reaching only 14°C (58°F) and an average temperature of 5°C (41°F). Precipitation levels also differ significantly; August typically sees just 11 mm (0.4 in) over 2 days, compared to January's substantial 205 mm (8.1 in) across 17 days, accompanied by a higher humidity of 85%. For a closer look at what to expect in January, you can visit Saint Helens weather in January.

August and February present striking contrasts in weather. August showcases a warm climate, with temperatures ranging from a mild 8°C (47°F) at night to a scorching maximum of 39°C (102°F), accompanied by low precipitation of just 11 mm (0.4 in) over two days. In contrast, February is marked by significantly cooler temperatures, with a minimum of -7°C (19°F) and an average of only 4°C (40°F), along with a substantial increase in rainfall—205 mm (8.1 in) over 20 days. Additionally, February has higher humidity levels at 84%, compared to August’s 74%. For more insights on the February climate, you can check out Saint Helens weather in February.

August and March present strikingly different weather patterns. In August, temperatures reach a maximum of 39°C (102°F) with an average of 20°C (69°F), characterized by low precipitation of just 11 mm (0.4 in) over 2 days and a humidity of 74%. In contrast, March delivers a cooler atmosphere, where temperatures vary from a minimum of -3°C (27°F) to a maximum of 22°C (73°F), accompanied by significant rainfall of 163 mm (6.4 in) over 18 days, and higher humidity at 85%. For more details, you can check out Saint Helens weather in March.

When comparing the weather in August and April, a striking contrast emerges. August boasts a much warmer climate with temperatures ranging from a minimum of 8°C (47°F) to a scorching maximum of 39°C (102°F) and an average of 20°C (69°F). In stark contrast, April experiences cooler temperatures, with a minimum of -1°C (30°F) and a maximum of 29°C (85°F), averaging only 10°C (51°F). While August has relatively low precipitation of just 11 mm (0.4 in) over 2 days, April is quite the opposite, featuring significant rainfall totaling 140 mm (5.5 in) across 16 rainy days. Additionally, humidity levels remain high in both months, but April's 83% slightly surpasses August's 74%. For those interested in a deeper look into April's weather specifics, visit Saint Helens weather in April.

When comparing the weather in August and May, a stark contrast emerges. August experiences warmer temperatures with a minimum of 8°C (47°F) and an average of 20°C (69°F), peaking at 39°C (102°F). In contrast, May presents cooler conditions, starting at a minimum of 3°C (37°F), averaging at 14°C (57°F), and reaching a maximum of 32°C (90°F). Additionally, precipitation in August is relatively low at 11 mm (0.4 in) over just 2 days, while May sees significantly more rain, with 73 mm (2.9 in) over 11 days. Humidity levels are also higher in May at 83%, compared to 74% in August. For those looking for more detailed insights, check out Saint Helens weather in May.

When comparing the weather in August and June, we see notable differences. August typically features a broader temperature range, with minimums around 8°C (47°F) and maximums reaching up to 39°C (102°F), while June has slightly cooler temperatures, ranging from a minimum of 6°C (43°F) to a maximum of 45°C (113°F). Precipitation also varies significantly; August is relatively dry with only 11 mm (0.4 inches) over 2 days, whereas June experiences more rainfall at 62 mm (2.5 inches) spread over 9 days. Additionally, humidity levels in August average 74%, compared to a higher 83% in June. For those seeking detailed weather information, you can check out Saint Helens weather in June.

In comparing the weather between July and August, we see that both months have a similar range of temperatures, with August recording a slightly higher maximum temperature of 39°C (102°F) compared to July's 37°C (99°F). The average temperatures are quite alike, with August averaging 20°C (69°F) and July at 20°C (68°F). Precipitation levels are fairly consistent, with August receiving 11 mm (0.4 in) and July 9 mm (0.3 in), both spread over two days. However, humidity in August is lower at 74%, down from July's 82%. For detailed information on July's weather, you can refer to Saint Helens weather in July.

August typically features warmer temperatures, with average highs reaching up to 39°C (102°F) and an average of 20°C (69°F). The humidity is relatively high at 74%, but the month experiences minimal precipitation, with only 11 mm (0.4 in) over just 2 days. In contrast, September brings a noticeable drop in temperatures, with a maximum of 35°C (95°F) and an average of 17°C (63°F). However, the month is significantly wetter, receiving 90 mm (3.6 in) of rain across 9 days, and the humidity slightly decreases to 71%. For more detailed insights, you can check Saint Helens weather in September.

August and October present a stark contrast in weather conditions. In August, temperatures range from a comfortable minimum of 8°C (47°F) to a sweltering maximum of 39°C (102°F), with an average temperature of 20°C (69°F). The month experiences minimal precipitation, with only 11 mm (0.4 in) recorded over just two days, and humidity levels averaging around 74%. In contrast, October sees a significant drop in temperatures, with a minimum of -2°C (29°F) and an average of 11°C (52°F). The maximum temperature is more moderate at 26°C (78°F). However, October is much wetter, accumulating 149 mm (5.9 in) of precipitation over 13 rainy days, while humidity rises to 81%. For more detailed information, you can check Saint Helens weather in October.

In August, the weather is typically warm with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 39°C (102°F), averaging around 20°C (69°F). With relatively low precipitation of just 11 mm (0.4 in) over two days and a humidity level of 74%, August offers a pleasant and dry climate for outdoor activities. In contrast, November presents a stark shift, featuring much cooler temperatures with a minimum of -3°C (27°F) and a maximum of 18°C (64°F), averaging only 7°C (46°F). The month is considerably wetter, receiving 209 mm (8.2 in) of precipitation spread over 18 days, coupled with higher humidity at 87%. For a closer look at what to expect, check out Saint Helens weather in November.

In August, the weather is characterized by warmer temperatures, with an average of 20°C (69°F) and highs reaching up to 39°C (102°F). The month sees limited rainfall, with only 11 mm (0.4 in) of precipitation occurring over just 2 days, alongside a relatively comfortable humidity level of 74%. In contrast, December brings a significant drop in temperature, with averages around 5°C (41°F) and a maximum of only 15°C (59°F). This winter month experiences much more precipitation—224 mm (8.8 in) spread across approximately 20 days—resulting in higher humidity at 87%. For more detailed information on December weather, please visit Saint Helens weather in December.

Compare Saint Helens's Climate with Cities Worldwide

Conclusion: What to Expect From August Weather in Saint Helens

August in Saint Helens stands out as a vibrant end to summer, featuring warm temperatures that frequently peak near a sizzling 39°C (102°F), while offering a comfortable average of 20°C (69°F). Unlike the wetter months, this period sees significantly reduced precipitation, with only a couple of rainy days contributing to a modest total of 11 mm (0.4 in) of rainfall. The higher humidity of around 74% can add a touch of stickiness to the warm air, making the evenings feel pleasantly balmy. In contrast to the rest of the year, which varies more dramatically in temperature and rainfall, August invites locals and visitors alike to relish the warmth before fall takes hold. For a deeper dive into the seasonal trends, explore the detailed Saint Helens Climate.