Climate and monthly weather forecast
Monmouth, OR

Weather in January

January, like December, is another chilly winter month in Monmouth, Oregon, with an average temperature fluctuating between 35.1°F (1.7°C) and 46.9°F (8.3°C). In January, the average high-temperature is essentially the same as in December - a still frosty 46.9°F (8.3°C). Weather in January »

Weather in February

February, the last month of the winter in Monmouth, is another chilly month, with temperature in the range of an average high of 48.2°F (9°C) and an average low of 35.1°F (1.7°C). In Monmouth, the average high-temperature in February is almost the same as in January - a still chilly 48.2°F (9°C). Weather in February »

Weather in March

The first month of the spring, March, is a cool month in Monmouth, Oregon, with an average temperature varying between 52°F (11.1°C) and 36.9°F (2.7°C). In Monmouth, the average high-temperature in March is relatively the same as in February - a cool 52°F (11.1°C). Weather in March »

Weather in April

April in Monmouth, Oregon, is a moderate spring month, with an average temperature varying between 38.3°F (3.5°C) and 57.7°F (14.3°C). In Monmouth, the average high-temperature in April slightly increases from a fresh 52°F (11.1°C) in March to a moderate 57.7°F (14.3°C). Weather in April »

Weather in May

May, the last month of the spring in Monmouth, is a comfortable month, with an average temperature varying between 65.8°F (18.8°C) and 42.4°F (5.8°C). In Monmouth, Oregon, the average high-temperature in May marginally rises from a moderate 57.7°F (14.3°C) in April to an enjoyable 65.8°F (18.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Monmouth, Oregon, with an average temperature fluctuating between 70.9°F (21.6°C) and 46.8°F (8.2°C). In Monmouth, the average high-temperature in June is practically the same as in May - a pleasant 70.9°F (21.6°C). Weather in June »

Weather in July

July is a moderately hot summer month in Monmouth, Oregon, with an average temperature ranging between min 51.3°F (10.7°C) and max 79.2°F (26.2°C). In July, the average high-temperature marginally rises from an agreeable 70.9°F (21.6°C) in June to a moderately hot 79.2°F (26.2°C). Weather in July »

Weather in August

August, the last month of the summer in Monmouth, is also a moderately hot month, with an average temperature ranging between min 52.5°F (11.4°C) and max 80.8°F (27.1°C). August is the warmest month, with an average high-temperature of 80.8°F (27.1°C) and an average low-temperature of 52.5°F (11.4°C). The average heat index in August is calculated to be 84.2°F (29°C). Weather in August »

Weather in September

September, the first month of the autumn in Monmouth, is still a warm month, with an average temperature ranging between min 50°F (10°C) and max 73.8°F (23.2°C). In September, the average high-temperature slightly decreases from a moderately hot 80.8°F (27.1°C) in August to a still warm 73.8°F (23.2°C). Weather in September »

Weather in October

October, like September, in Monmouth, Oregon, is another comfortable autumn month, with an average temperature varying between 44.1°F (6.7°C) and 61.7°F (16.5°C). In October, the average high-temperature drops from a warm 73.8°F (23.2°C) in September to an enjoyable 61.7°F (16.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Monmouth, is also a fresh month, with an average temperature ranging between max 50.9°F (10.5°C) and min 39°F (3.9°C). In Monmouth, the average high-temperature in November drops from a comfortable 61.7°F (16.5°C) in October to a cool 50.9°F (10.5°C). Weather in November »

Weather in December

December, the first month of the winter in Monmouth, is still a chilly month, with an average temperature varying between 34.2°F (1.2°C) and 44.2°F (6.8°C). The coldest month is December, with an average high-temperature of 44.2°F (6.8°C) and an average low-temperature of 34.2°F (1.2°C). Weather in December »
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FAQ

How many days does it rain in Monmouth?

Throughout the year, there are 144.6 rainfall days, and 10.04" (255mm) of precipitation is accumulated.

When does it snow in Monmouth?

Months with snowfall in Monmouth, Oregon, are January through March and December.

How many days does it snow in Monmouth?

In Monmouth, Oregon, during the entire year, snow falls for 4.5 days and aggregates up to 0.91" (23mm) of snow.

When is the lowest UV index in Monmouth?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the most humid month in Monmouth?

February and December, with an average relative humidity of 88%, are most humid months in Monmouth, Oregon.

When does it snow the most in Monmouth?

February is the month with the most snowfall. Snow falls for 1.8 days and accumulates 0.55" (14mm) of snow.

What is the month with the least sunshine in Monmouth?

With an average of 4h of sunshine, February has the least sunshine of the year in Monmouth, Oregon.

When is Daylight Saving Time (DST) in Monmouth?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Monmouth, Oregon, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from PDT to PST.

When it does not snow in Monmouth?

In Monmouth, Oregon, snow does not fall in April through November.

When are the longest days in Monmouth?

With an average of 15h and 32min of daylight, June has the longest days of the year in Monmouth.

What are the months with the highest UV index in Monmouth?

June through August, with an average maximum UV index of 5, are months with the highest UV index in Monmouth.

What is the driest month in Monmouth?

The month with the least rainfall in Monmouth is July, when the rain falls for 4.3 days and typically collects 0.12" (3mm) of precipitation.

What are the months with the most sunshine in Monmouth?

July and August, with an average of 10.9h of sunshine, are months with the most sunshine in Monmouth.

What is the warmest month in Monmouth?

The warmest month is August, with an average high-temperature of 80.8°F (27.1°C) and an average low-temperature of 52.5°F (11.4°C).

What is the least humid month in Monmouth?

The least humid month in Monmouth is August, with an average relative humidity of 68%.

What is the coldest month in Monmouth?

With an average high-temperature of 44.2°F (6.8°C) and an average low-temperature of 34.2°F (1.2°C), December is the coldest month in Monmouth, Oregon.

What is the rainiest month in Monmouth?

The month with the most rainfall in Monmouth is December, when the rain falls for 16.5 days and typically aggregates up to 1.54" (39mm) of precipitation.

What is the month with the shortest days in Monmouth?

December has the shortest days of the year, with an average of 8h and 52min of daylight.

Average temperature
Monmouth, OR

Average temperature - Monmouth, OR

The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (44.2°F).

The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).

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Average pressure
Monmouth, OR

Average pressure - Monmouth, 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).

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Average wind speed
Monmouth, OR

Average wind speed - Monmouth, OR

The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

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Average humidity
Monmouth, OR

Average humidity - Monmouth, OR

The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is August (68%).

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Average rainfall
Monmouth, OR

Average rainfall - Monmouth, OR

The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is July (0.12").

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Average rainfall days
Monmouth, OR

Average rainfall days - Monmouth, OR

The month with the highest number of rainy days is March (17.8 days).
The month with the least rainy days is August (4 days).

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Average snowfall
Monmouth, OR

Average snowfall - Monmouth, OR

The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days
Monmouth, OR

Average snowfall days - Monmouth, OR

The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Monmouth, OR

Average daylight / Average sunshine - Monmouth, OR

The month with the longest days is June (Average daylight: 15h and 32min).
The month with the shortest days is December (Average daylight: 8h and 52min).

The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).

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Average sunshine days
Monmouth, OR

Average sunshine days - Monmouth, OR

The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is March (9.7 days).

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Average UV index
Monmouth, OR

Average UV index - Monmouth, OR

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Monmouth, OR

Average visibility - Monmouth, OR

The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).

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