Climate and monthly weather forecast
Saint Helens, OR

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Weather in January

January is a chilly winter month in Saint Helens, Oregon, with an average temperature ranging between min 32.9°F (0.5°C) and max 43.9°F (6.6°C). Saint Helens measures an average high-temperature of a frosty 43.9°F (6.6°C) in January, nearly consistent with the preceding month. Weather in January »

Weather in February

February, the last month of the winter in Saint Helens, is also a frosty month, with an average temperature ranging between min 32.5°F (0.3°C) and max 44.6°F (7°C). Upon the beginning of February, Saint Helens's high-temperatures register at a still frosty 44.6°F (7°C), closely mirroring the preceding month. Weather in February »

Weather in March

March, the first month of the spring in Saint Helens, is still a chilly month, with an average temperature ranging between min 33.8°F (1°C) and max 48.7°F (9.3°C). The introduction of March notes a subtle temperature variation to a still chilly 48.7°F (9.3°C) from February's 44.6°F (7°C). Weather in March »

Weather in April

April is a fresh spring month in Saint Helens, Oregon, with an average temperature varying between 36.1°F (2.3°C) and 54.3°F (12.4°C). Saint Helens's weather in April shows a minor rise in the average high-temperature, moving slightly up from March's chilly 48.7°F (9.3°C) to a cool 54.3°F (12.4°C). Weather in April »

Weather in May

May, the last month of the spring in Saint Helens, is an enjoyable month, with an average temperature varying between 39.9°F (4.4°C) and 62.8°F (17.1°C). May's arrival coincides with a marginal rise in the average high-temperature, moving from April's cool 54.3°F (12.4°C) to a refreshing 62.8°F (17.1°C). Weather in May »

Weather in June

The first month of the summer, June, is still a comfortable month in Saint Helens, Oregon, with an average temperature fluctuating between 67.6°F (19.8°C) and 43°F (6.1°C). June is marked by an average high-temperature of a still enjoyable 67.6°F (19.8°C), almost identical to the preceding month. Weather in June »

Weather in July

July is a moderately hot summer month in Saint Helens, Oregon, with an average temperature ranging between max 75.4°F (24.1°C) and min 46.6°F (8.1°C). July comes with a subtle rise, with the average high-temperature adjusting from a refreshing 67.6°F (19.8°C) in June to a moderately hot 75.4°F (24.1°C). Weather in July »

Weather in August

August, the last month of the summer in Saint Helens, is also a moderately hot month, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 76.5°F (24.7°C). August, known for its average high temperature of 76.5°F (24.7°C) and an average low temperature of 47.8°F (8.8°C), is the warmest month. Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Saint Helens, Oregon, with an average temperature varying between 45.5°F (7.5°C) and 69.3°F (20.7°C). Saint Helens in September undergoes a slight reduction in the average high-temperature, shifting from August's moderately hot 76.5°F (24.7°C) to an agreeable 69.3°F (20.7°C). Weather in September »

Weather in October

October, the same as September, in Saint Helens, Oregon, is a moderate autumn month, with an average temperature fluctuating between 58.1°F (14.5°C) and 41.7°F (5.4°C). The transition into October is accompanied by a temperature decrease, with the average high-temperature shifting from an agreeable 69.3°F (20.7°C) in September to a mild 58.1°F (14.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Saint Helens, is also a frosty month, with an average temperature fluctuating between 47.7°F (8.7°C) and 36.7°F (2.6°C). November weather is marked by a drop in the average high-temperature, falling from a refreshing 58.1°F (14.5°C) in October to a chilly 47.7°F (8.7°C). Weather in November »

Weather in December

December, the first month of the winter in Saint Helens, is also a wintry month, with temperature in the range of an average high of 41.9°F (5.5°C) and an average low of 31.8°F (-0.1°C). December is the month when Saint Helens experiences its coldest temperatures, averaging a high of 41.9°F (5.5°C) and a low of 31.8°F (-0.1°C). Weather in December »
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the wettest month?

January is the month with the most rainfall. Rain falls for 14.5 days and accumulates 2.64" (67mm) of precipitation.

How many days does it rain in Saint Helens?

Throughout the year, there are 149 rainfall days, and 19.37" (492mm) of precipitation is accumulated.

When does it snow?

January through April, November and December are months with snowfall.

When does it snow the most?

The month with the most snowfall is January, when snow falls for 2.1 days and typically aggregates up to 1.97" (50mm) of snow.

How much does it snow?

In Saint Helens, during the entire year, snow falls for 10.2 days and aggregates up to 5.91" (150mm) of snow.

What are the months with the least sunshine?

January, February and December, with an average of 3.7h of sunshine, are months with the least sunshine.

What is the most humid month?

The most humid month is February, with an average relative humidity of 88%.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.

When it does not snow?

May through October are months without snowfall.

When are the longest days?

June has the longest days of the year, with an average of 15h and 42min of daylight.

What are the least humid months?

The months with the lowest humidity are July and August, with an average relative humidity of 72%.

What is the driest month?

The month with the least rainfall is July, when the rain falls for 5.9 days and typically collects 0.31" (8mm) of precipitation.

When is the highest UV index?

July is the month with the highest UV index, with an average maximum UV index of 5.

What is the warmest month?

August, recognised by an average high temperature of 76.5°F (24.7°C) and a low of 47.8°F (8.8°C), is Saint Helens's warmest month.

What month has the most sunshine?

With an average of 10.4h of sunshine, August has the most sunshine of the year.

When is the lowest UV index?

With an average maximum UV index of 1, November is the month with the lowest UV index.

What part of the year is the coldest?

December, on average, is the coldest month, registering a high temperature of 41.9°F (5.5°C) and a low of 31.8°F (-0.1°C).

What is the month with the shortest days?

With an average of 8h and 42min of daylight, December has the shortest days of the year.

Average temperature
Saint Helens, OR

Average temperature - Saint Helens, OR

The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (41.9°F).

The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (31.8°F).

Average pressure
Saint Helens, OR

Average pressure - Saint Helens, OR

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

Average wind speed
Saint Helens, OR

Average wind speed - Saint Helens, OR

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

Average humidity
Saint Helens, OR

Average humidity - Saint Helens, OR

The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are July and August (72%).

Average rainfall
Saint Helens, OR

Average rainfall - Saint Helens, OR

The wettest month (with the highest rainfall) is January (2.64").
The driest month (with the least rainfall) is July (0.31").

Average rainfall days
Saint Helens, OR

Average rainfall days - Saint Helens, OR

The month with the highest number of rainy days is March (16 days).
The month with the least rainy days is July (5.9 days).

Average snowfall
Saint Helens, OR

Average snowfall - Saint Helens, OR

The month with the highest snowfall is January (1.97").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days
Saint Helens, OR

Average snowfall days - Saint Helens, OR

The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
Saint Helens, OR

Average daylight / Average sunshine - Saint Helens, OR

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 42min).

Average sunshine days
Saint Helens, OR

Average sunshine days - Saint Helens, OR

The month with the most sunshine days is July (23.7 days).
The month with the least sunshine days is February (12.1 days).

Average visibility
Saint Helens, OR

Average visibility - Saint Helens, OR

The months with the highest visibility are July and August (5mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (4mi).

Saint Helens, Oregon, USA

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