Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Saint Helens Weather in September
September in Saint Helens brings high temperatures, with daytime highs of 25°C (77°F) and nights around 10°C (50°F). The excellent weather makes it a solid choice for a visit.
Rainfall in Saint Helens in September
Records from the past 30 years suggest around 9 days of rain, with 42 mm (1.7 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Saint Helens in September
The excellent temperature in Saint Helens in September makes it a solid month to visit, with 25°C (77°F) during the day and 10°C (50°F) at night. September is a notable month of the summer season. Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Saint Helens in September
Enjoy a sunny month with about 236 hours of sunshine, the clear skies make Saint Helens even more beautiful.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Saint Helens.
Saint Helens Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
25°C (77°F)
Chance of Rain
30%
Precipitation
42 mm (1.7 in)
Rainy days
9 days
Humidity
69% *
Sunshine
236 hours *
Percentage Sunshine
*
* Data from: Portland, the United States of America (33 KM, 20 Miles).
Saint Helens Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint Helens - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Saint Helens in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Saint Helens in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming10/10 -
Cycling10/10 -
Walking10/10 -
Barbeque9/10 -
Camping10/10 -
Outdoor sports10/10
Saint Helens 3-Day Forecast
More climate data for Saint Helens
Temperature Rainfall Sunshine Humidity
See the full Saint Helens climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
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Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
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