Climate and monthly weather forecast
Lake Oswego, OR

Weather in January

January, like December, is a frosty winter month in Lake Oswego, Oregon, with an average temperature fluctuating between 35.2°F (1.8°C) and 46.2°F (7.9°C). In Lake Oswego, the average high-temperature in January is practically the same as in December - a still chilly 46.2°F (7.9°C). Weather in January »

Weather in February

February, the last month of the winter in Lake Oswego, is also a frosty month, with temperature in the range of an average low of 35.6°F (2°C) and an average high of 47.5°F (8.6°C). In Lake Oswego, Oregon, the average high-temperature in February is practically the same as in January - a still frosty 47.5°F (8.6°C). Weather in February »

Weather in March

March, the first month of the spring in Lake Oswego, is a fresh month, with an average temperature ranging between max 52.5°F (11.4°C) and min 37.9°F (3.3°C). In March, the average high-temperature is essentially the same as in February - a fresh 52.5°F (11.4°C). Weather in March »

Weather in April

April in Lake Oswego, Oregon, is a mild spring month, with an average temperature varying between 58.6°F (14.8°C) and 39.7°F (4.3°C). In Lake Oswego, the average high-temperature in April marginally rises from a fresh 52.5°F (11.4°C) in March to a mild 58.6°F (14.8°C). Weather in April »

Weather in May

May, the last month of the spring in Lake Oswego, is a comfortable month, with temperature in the range of an average high of 66.7°F (19.3°C) and an average low of 44.1°F (6.7°C). In May, the average high-temperature slightly increases from a mild 58.6°F (14.8°C) in April to an enjoyable 66.7°F (19.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Lake Oswego, Oregon, with an average temperature varying between 48°F (8.9°C) and 72.1°F (22.3°C). In June, the average high-temperature slightly increases from an enjoyable 66.7°F (19.3°C) in May to an agreeable 72.1°F (22.3°C). Weather in June »

Weather in July

July in Lake Oswego, Oregon, is a warm summer month, with an average temperature ranging between min 52.3°F (11.3°C) and max 80.8°F (27.1°C). In July, the average high-temperature slightly increases from an agreeable 72.1°F (22.3°C) in June to a warm 80.8°F (27.1°C). Weather in July »

Weather in August

August, the last month of the summer in Lake Oswego, is another warm month, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 54.5°F (12.5°C). With an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 54.5°F (12.5°C), August is the warmest month. In August, the average heat index is appraised at 84.2°F (29°C). Weather in August »

Weather in September

September, the first month of the autumn in Lake Oswego, is still a warm month, with an average temperature varying between 51.1°F (10.6°C) and 74.1°F (23.4°C). In September, the average high-temperature slightly decreases from a warm 81.7°F (27.6°C) in August to a still moderately hot 74.1°F (23.4°C). Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Lake Oswego, Oregon, with an average temperature varying between 61.9°F (16.6°C) and 45.5°F (7.5°C). In Lake Oswego, the average high-temperature in October decreases from a moderately hot 74.1°F (23.4°C) in September to an enjoyable 61.9°F (16.6°C). Weather in October »

Weather in November

November, the last month of the autumn in Lake Oswego, is another cool month, with an average temperature ranging between min 40.1°F (4.5°C) and max 51.1°F (10.6°C). In November, the average high-temperature decreases from an enjoyable 61.9°F (16.6°C) in October to a cool 51.1°F (10.6°C). Weather in November »

Weather in December

The first month of the winter, December, is still a chilly month in Lake Oswego, Oregon, with an average temperature fluctuating between 34.7°F (1.5°C) and 44.4°F (6.9°C). December is the coldest month, with an average high-temperature of 44.4°F (6.9°C) and an average low-temperature of 34.7°F (1.5°C). Weather in December »
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FAQ

How many days does it rain in Lake Oswego?

In Lake Oswego, during the entire year, the rain falls for 172.2 days and collects up to 31.3" (795mm) of precipitation.

When does it snow in Lake Oswego?

January through March, November and December are months with snowfall in Lake Oswego, Oregon.

How much does it snow in Lake Oswego?

In Lake Oswego, during the entire year, snow falls for 6.5 days and aggregates up to 4.13" (105mm) of snow.

When is the lowest UV index in Lake Oswego?

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

What is the most humid month in Lake Oswego?

The most humid month in Lake Oswego, Oregon, is February, with an average relative humidity of 84%.

What is the month with the least sunshine in Lake Oswego?

With an average of 4.2h of sunshine, February has the least sunshine of the year.

When does it snow the most in Lake Oswego?

March is the month with the most snowfall in Lake Oswego. Snow falls for 1.6 days and accumulates 1.46" (37mm) of snow.

When is Daylight Saving Time (DST) in Lake Oswego?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, 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 Lake Oswego?

April through October are months without snowfall.

When are the longest days in Lake Oswego?

The month with the longest days in Lake Oswego, Oregon, is June, with an average of 15h and 37min of daylight.

What is the driest month in Lake Oswego?

The month with the least rainfall in Lake Oswego is July, when the rain falls for 4.8 days and typically collects 0.31" (8mm) of precipitation.

When is the highest UV index in Lake Oswego?

The month with the highest UV index in Lake Oswego, Oregon, is July, with an average maximum UV index of 6.

What is the warmest month in Lake Oswego?

The warmest month is August, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 54.5°F (12.5°C).

What is the least humid month in Lake Oswego?

August is the least humid month, with an average relative humidity of 63%.

What month has the most sunshine in Lake Oswego?

With an average of 11h of sunshine, August has the most sunshine of the year in Lake Oswego.

What is the coldest month in Lake Oswego?

The coldest month is December, with an average high-temperature of 44.4°F (6.9°C) and an average low-temperature of 34.7°F (1.5°C).

What is the rainiest month in Lake Oswego?

December is the month with the most rainfall in Lake Oswego. Rain falls for 18.5 days and accumulates 4.57" (116mm) of precipitation.

What is the month with the shortest days in Lake Oswego?

December has the shortest days of the year, with an average of 8h and 47min of daylight.

Average temperature
Lake Oswego, OR

Average temperature - Lake Oswego, OR

The warmest month (with the highest average high temperature) is August (81.7°F).
The month with the lowest average high temperature is December (44.4°F).

The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).

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Average pressure
Lake Oswego, OR

Average pressure - Lake Oswego, OR

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed
Lake Oswego, OR

Average wind speed - Lake Oswego, OR

The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity
Lake Oswego, OR

Average humidity - Lake Oswego, OR

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (63%).

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Average rainfall
Lake Oswego, OR

Average rainfall - Lake Oswego, OR

The wettest month (with the highest rainfall) is December (4.57").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days
Lake Oswego, OR

Average rainfall days - Lake Oswego, OR

The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is July (4.8 days).

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Average snowfall
Lake Oswego, OR

Average snowfall - Lake Oswego, OR

The month with the highest snowfall is March (1.46").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Lake Oswego, OR

Average snowfall days - Lake Oswego, OR

The month with the highest number of snowfall days is February (2.3 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
Lake Oswego, OR

Average daylight / Average sunshine - Lake Oswego, OR

The month with the longest days is June (Average daylight: 15h and 37min).
The month with the shortest days is December (Average daylight: 8h and 47min).

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

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Average sunshine days
Lake Oswego, OR

Average sunshine days - Lake Oswego, OR

The month with the most sunshine days is July (23.9 days).
The month with the least sunshine days is February (8.3 days).

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Average UV index
Lake Oswego, OR

Average UV index - Lake Oswego, OR

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Lake Oswego, OR

Average visibility - Lake Oswego, OR

The months with the highest visibility are July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, November and December (5mi).

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