Climate and monthly weather forecast
Rainier, OR

Share

Weather in January

January is a chilly winter month in Rainier, Oregon, with an average temperature fluctuating between 44.2°F (6.8°C) and 33.4°F (0.8°C). With the advent of January, Rainier's high-temperatures adjust to a frosty 44.2°F (6.8°C), closely aligning with the preceding month. Weather in January »

Weather in February

The last month of the winter, February, is another chilly month in Rainier, Oregon, with an average temperature fluctuating between 33.3°F (0.7°C) and 45.5°F (7.5°C). Rainier experiences a transition to a still chilly 45.5°F (7.5°C) in average high-temperatures with the arrival of February, not greatly differing from January's 44.2°F (6.8°C). Weather in February »

Weather in March

March, the first month of the spring in Rainier, is a cool month, with an average temperature fluctuating between 34.7°F (1.5°C) and 50°F (10°C). March's weather records an average high-temperature of a cool 50°F (10°C), showing little deviation from February. Weather in March »

Weather in April

April is a refreshing spring month in Rainier, Oregon, with an average temperature varying between 36.7°F (2.6°C) and 55.9°F (13.3°C). The shift from March to April is marked by a slight increase in the average high-temperature, moving from a cool 50°F (10°C) to a mild 55.9°F (13.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Rainier, Oregon, with temperature in the range of an average low of 40.8°F (4.9°C) and an average high of 64.8°F (18.2°C). May's arrival sees a mild rise in the average high-temperature, transitioning from April's refreshing 55.9°F (13.3°C) to an enjoyable 64.8°F (18.2°C). Weather in May »

Weather in June

June, the first month of the summer in Rainier, is an agreeable month, with an average temperature varying between 69.4°F (20.8°C) and 44.6°F (7°C). Entering June, the average high-temperature is recorded at a pleasant 69.4°F (20.8°C), exhibiting a minimal shift from May's 64.8°F (18.2°C). Weather in June »

Weather in July

July in Rainier, Oregon, is a warm summer month, with an average temperature fluctuating between 76.8°F (24.9°C) and 48.9°F (9.4°C). The transition from June to July brings a subtle temperature rise, with average high-temperatures increasing from an agreeable 69.4°F (20.8°C) to a moderately hot 76.8°F (24.9°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Rainier, Oregon, with an average temperature varying between 49.8°F (9.9°C) and 77.9°F (25.5°C). August is the warmest month, exhibiting average temperatures of 77.9°F (25.5°C) at the peak and 49.8°F (9.9°C) at the base. Weather in August »

Weather in September

September, the first month of the autumn in Rainier, is also an agreeable month, with an average temperature varying between 70.7°F (21.5°C) and 47.3°F (8.5°C). The onset of September brings a small shift in high-temperatures, falling from a warm 77.9°F (25.5°C) in August to a pleasant 70.7°F (21.5°C). Weather in September »

Weather in October

October, the same as September, in Rainier, Oregon, is another mild autumn month, with temperature in the range of an average low of 42.3°F (5.7°C) and an average high of 59°F (15°C). In October, the average high-temperature decreases from a pleasant 70.7°F (21.5°C) in September to a mild 59°F (15°C). Weather in October »

Weather in November

November, the last month of the autumn in Rainier, is also a frosty month, with an average temperature fluctuating between 48.4°F (9.1°C) and 37.6°F (3.1°C). In Rainier, the average high-temperature in November decreases from a moderate 59°F (15°C) in October to a frosty 48.4°F (9.1°C). Weather in November »

Weather in December

December, the first month of the winter in Rainier, is also a wintry month, with an average temperature fluctuating between 42.3°F (5.7°C) and 32.7°F (0.4°C). December tends to be the coldest month, with temperatures averaging a daily high of 42.3°F (5.7°C) and a low of 32.7°F (0.4°C). Weather in December »
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the most humid months?

January, February, November and December, with an average relative humidity of 88%, are most humid months.

What is the wettest month?

January is the month with the most rainfall. Rain falls for 18.7 days and accumulates 3.9" (99mm) of precipitation.

How much does it rain?

Throughout the year, there are 175.5 rainfall days, and 25.83" (656mm) of precipitation is accumulated.

When does it snow?

January through March, 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 1.7 days and typically aggregates up to 1.26" (32mm) of snow.

How many days does it snow?

In Rainier, during the entire year, snow falls for 6.7 days and aggregates up to 3.54" (90mm) of snow.

What are the months with the least sunshine?

The months with the least sunshine are January, February and December, with an average of 3.5h of sunshine.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Rainier, 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?

April through October are months without snowfall.

When are the longest days in Rainier?

The month with the longest days is June, with an average of 15h and 42min of daylight.

When is the highest UV index?

The months with the highest UV index are June and July, with an average maximum UV index of 5.

What is the least humid month?

With an average relative humidity of 72%, July is the least humid month.

What is the hottest time of year?

Temperature records mark August as the warmest month, with highs averaging 77.9°F (25.5°C) and lows at 49.8°F (9.9°C).

What is the driest month?

The month with the least rainfall is August, when the rain falls for 6.3 days and typically collects 0.39" (10mm) of precipitation.

What month has the most sunshine?

August has the most sunshine of the year in Rainier, with an average of 10.4h of sunshine.

When is the lowest UV index?

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

What part of the year is the coldest?

With an average high-temperature of 42.3°F (5.7°C) and an average low-temperature of 32.7°F (0.4°C), December is the coldest month.

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
Rainier, OR

Average temperature - Rainier, OR

The warmest month (with the highest average high temperature) is August (77.9°F).
The month with the lowest average high temperature is December (42.3°F).

The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).

Average pressure
Rainier, OR

Average pressure - Rainier, OR

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

Average wind speed
Rainier, OR

Average wind speed - Rainier, OR

The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).

Average humidity
Rainier, OR

Average humidity - Rainier, OR

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

Average rainfall
Rainier, OR

Average rainfall - Rainier, OR

The wettest month (with the highest rainfall) is January (3.9").
The driest month (with the least rainfall) is August (0.39").

Average rainfall days
Rainier, OR

Average rainfall days - Rainier, OR

The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is July (6.1 days).

Average snowfall
Rainier, OR

Average snowfall - Rainier, OR

The month with the highest snowfall is January (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days
Rainier, OR

Average snowfall days - Rainier, OR

The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
Rainier, OR

Average daylight / Average sunshine - Rainier, 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 30min).

Average sunshine days
Rainier, OR

Average sunshine days - Rainier, OR

The month with the most sunshine days is July (22 days).
The month with the least sunshine days is March (8.9 days).

Average visibility
Rainier, OR

Average visibility - Rainier, OR

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

Rainier, Oregon, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location