Climate and monthly weather forecastSaint Helens, OR
Climate and monthly weather forecast
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
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the month with the most rainfall. Rain falls for 14.5 days and accumulates 2.64" (67mm) of precipitation.
Throughout the year, there are 149 rainfall days, and 19.37" (492mm) of precipitation is accumulated.
January through April, November and December are months with snowfall.
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.
In Saint Helens, during the entire year, snow falls for 10.2 days and aggregates up to 5.91" (150mm) of snow.
January, February and December, with an average of 3.7h of sunshine, are months with the least sunshine.
The most humid month is February, with an average relative humidity of 88%.
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.
May through October are months without snowfall.
June has the longest days of the year, with an average of 15h and 42min of daylight.
The months with the lowest humidity are July and August, with an average relative humidity of 72%.
The month with the least rainfall is July, when the rain falls for 5.9 days and typically collects 0.31" (8mm) of precipitation.
July is the month with the highest UV index, with an average maximum UV index of 5.
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.
With an average of 10.4h of sunshine, August has the most sunshine of the year.
With an average maximum UV index of 1, November is the month with the lowest UV index.
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).
With an average of 8h and 42min of daylight, December has the shortest days of the year.
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 in January:
30.11"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
30.06"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
30.03"Hg
- Average pressure in July:
30.04"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.09"Hg
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 in January:
5.3mph - Average wind speed in February:
4.8mph - Average wind speed in March:
4.8mph - Average wind speed in April:
4.3mph - Average wind speed in May:
3.9mph - Average wind speed in June:
3.7mph
- Average wind speed in July:
3.8mph - Average wind speed in August:
3.5mph - Average wind speed in September:
3.7mph - Average wind speed in October:
4.3mph - Average wind speed in November:
5mph - Average wind speed in December:
4.9mph
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
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 in January:
2.64" - Average rainfall in February:
1.85" - Average rainfall in March:
1.93" - Average rainfall in April:
1.77" - Average rainfall in May:
1.26" - Average rainfall in June:
0.94"
- Average rainfall in July:
0.31" - Average rainfall in August:
0.47" - Average rainfall in September:
1.22" - Average rainfall in October:
2.32" - Average rainfall in November:
2.13" - Average rainfall in December:
2.52"
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 in January:
14.5 days - Average rainfall days in February:
12.3 days - Average rainfall days in March:
16 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
12.8 days - Average rainfall days in June:
11.7 days
- Average rainfall days in July:
5.9 days - Average rainfall days in August:
6 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
13.6 days - Average rainfall days in November:
14.9 days - Average rainfall days in December:
15 days
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
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 in January:
2.1 days - Average snowfall days in February:
3.6 days - Average snowfall days in March:
2.1 days - Average snowfall days in April:
0.5 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
1.2 days
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 in January:
9h and 12min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 30min - Average daylight in December:
8h and 42min
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).
- Average sunshine in January:
3h and 42min - Average sunshine in February:
3h and 42min - Average sunshine in March:
4h and 48min - Average sunshine in April:
6h and 30min - Average sunshine in May:
7h and 48min - Average sunshine in June:
8h and 24min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
10h and 24min - Average sunshine in September:
8h and 30min - Average sunshine in October:
5h and 6min - Average sunshine in November:
3h and 54min - Average sunshine in December:
3h 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 in January:
14.4 days - Average sunshine days in February:
12.1 days - Average sunshine days in March:
12.8 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
16.8 days - Average sunshine days in June:
15.8 days
- Average sunshine days in July:
23.7 days - Average sunshine days in August:
23.2 days - Average sunshine days in September:
18.2 days - Average sunshine days in October:
16.3 days - Average sunshine days in November:
13.5 days - Average sunshine days in December:
13.9 days
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 UV index
Saint Helens, OR
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover
Saint Helens, OR
The month with the most cloud cover is March (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).
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).
