Climate and monthly weather forecast
Wilsonville, OR

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A row of beautiful modern homes in a leafy suburb spot in Wilsonville, Oregon
A row of beautiful modern homes in a leafy suburb spot in Wilsonville, Oregon

The climate of Wilsonville

Wilsonville, located in Oregon, USA, features a Mediterranean climate with warm summers (Köppen climate classification Csb). Skies in Wilsonville can be expected to be partly cloudy, with cloud coverage ranging from 21% in the warmest month to 58% during the winter. The city experiences both rain and snowfall, albeit in differing amounts at various points in the year.

Wilsonville notes a temperature difference from 35.1°F (1.7°C) in the winter months to 81°F (27.2°C) during warm summer times. Relative humidity is kept fairly high, with a yearly fluctuation between 65% and 85%.

Rainfall is a familiar sight throughout the year, with monthly average quantities varying from 0.31" (8mm) in the warm season to 4.49" (114mm) in the winter season. Residents may see a lot of precipitation in a month, with the number of days of rain in a particular month fluctuating between 4.4 days to 20.9 days. As accurately dictated by the Köppen classification, Wilsonville can see snow, though it is restricted mainly to the colder months, with the yearly snowfall days not exceeding 2.1 days.

The best time to visit Wilsonville

Based on the prevailing weather conditions, the ideal time to plan a visit to Wilsonville is from June to August. During these summer months, temperatures can range between 66°F (18.9°C) up to a pleasant 81°F (27.2°C). This period is also relatively dry, with rainfall not surpassing 1.3" (33mm), thereby providing favourable conditions for outdoor activities.

The worst time to visit Wilsonville

The period between November and January might not be the best time to explore Wilsonville. In these months, temperature drops from 50.7°F (10.4°C) to a chilly 35.1°F (1.7°C), coupled with relative humidity peaking at 85%. Also, rainfall is at its highest during this period, with an average of around 4" (102mm) per month. Visitors should be prepared for occasional snowfall, which although sparse (with under 2 days of snowfall), might add an extra chill to the weather.

Spring weather in Wilsonville

Spring in Wilsonville, encompassing the months from March to May, witnesses a steady increase in temperature and decrease in rainfall. The monthly average temperatures rise from 51.8°F (11°C) to 58.1°F (14.5°C), to a mellow 66°F (18.9°C). Rainfall ranges between 3.5" (89mm) and 1.73" (44mm), making this a wetter season compared to the summer.

Summer weather in Wilsonville

Summer months are the driest and warmest in Wilsonville, with the average temperature peaking at 81°F (27.2°C) in August, while the lowest rainfall is recorded at 0.31" (8mm) from July to August. This period witnesses the longest daylight hours, with values between 14.9 hours to a generous 15.6 hours, promising ample sunshine for tourists and locals alike.

Autumn weather in Wilsonville

Autumn in Wilsonville signifies the return of cooler temperature and increased precipitation. From September to November, the average temperature drops from 73.2°F (22.9°C) to 50.7°F (10.4°C), while the rainfall nearly doubles from 1.54" (39mm) to 3.27" (83mm). Despite this, autumn remains a season of moderate weather before the onset of winter.

Winter weather in Wilsonville

The winter months mark the coldest and wettest time of the year in Wilsonville. Temperature lowers from December to February, averaging from 44.2°F (6.8°C) to 35.1°F (1.7°C). Rainfall also peaks at 4.49" (114mm) in December. With fewer daylight hours, ranging from 9.5 hours to 8.8 hours, and marginally more snowfall, the winters of Wilsonville invite a unique experience.

Weather in January

January in Wilsonville, Oregon, is synonymous with rain and fairly low temperatures. The month is characterized by high humidity levels and frequent precipitation. Among all the climatic factors in this month, weather records indicate that rainfall predominantly rules with 4.21" (107mm) recorded, making it the third-wettest month. Weather in January »

Weather in February

February is typically known for mild temperatures and substantial rainfall. Forecasts highlight a higher influx of sunlight hours compared to January, albeit short. The month's standout feature is the highest snowfall recorded with an accumulation of 1.26" (32mm). Weather in February »

Weather in March

As spring starts to set in March, the weather in Wilsonville Oregon is relatively mild with more sunlight than the previous months. There are more hours of daylight which signals the onset of spring. Although the rainfall in March is slightly higher than the preceding February, measuring at 3.5" (89mm), the amount of sunshine also increases. Weather in March »

Weather in April

April's weather in Wilsonville, Oregon, is renowned for bringing a boost of warmer temperatures and longer hours of sunshine. The receding rain, more hours of daylight, and a noticeable increase in the sunshine duration mark the transition further into the season of spring. Weather in April »

Weather in May

May ushers in unmistakable signs of impending summer in Wilsonville, Oregon, with an abundance of sunlight and less clouds. This point in the year sees a sharp decrease in precipitation and increase in temperatures. A major decrease in rainfall from 2.83" (72mm) in April to 1.73" (44mm) in May marks the shift in seasons. Weather in May »

Weather in June

June in Wilsonville, Oregon, signals the arrival of the warmest season - summer. This is a time with longer daylight hours, minimal rainfall, and the warmth gradually increases. Notably, the numbers of sunshine hours peak in June, reaching 9.6 hours. Weather in June »

Weather in July

July is the epitome of summer season in Wilsonville, Oregon. It’s the warmest month and precipitation is at its lowest. A highly notable figure is the month’s maximum temperature which amplifies up to 79.7°F (26.5°C). This clearly establishes July as the hottest month. Weather in July »

Weather in August

August, being the heart of summer, sustains high temperatures similar to July but with an incremental decrease. Despite being a torrid month, the scenery of Wilsonville thrives under bountiful sunshine. Even though there is no notable flip in the weather pattern, August records the highest wind gust speed of 5.8mph (9.3km/h). Weather in August »

Weather in September

September marks the transition from summer back to fall in Wilsonville, Oregon. Additional hours of sunlight linger, providing ample opportunity for sightseeing. There’s a pronounced drop in temperature from August's peak, with average high temperature falling to 73.2°F (22.9°C). Weather in September »

Weather in October

October in Wilsonville, Oregon observes a rapid cooling as temperatures further drop, forecasting the advent of winter. The weather undergoes a change as longer nights and shorter days become more prominent. True to its Autumnal spirit, rainfall in October elevates to 3.15" (80mm), hinting towards the wetter, colder months ahead. Weather in October »

Weather in November

November sees a steep rise in precipitation, and the mercury level continues to fall in Wilsonville, Oregon. The daylight hours further diminish, with an increase in cloud cover, indicative of the progressing winter. A standout is the wind speed in November which rises up to 5.4mph (8.7km/h). Weather in November »

Weather in December

In December, Wilsonville, Oregon’s weather veers towards a wintry trend. Shorter daylight hours, along with cold days and chillier nights define the climate. A significant meteorological highlight of December is the relatively high amount of rainfall, marked at 4.49" (114mm). Weather in December »

Frequently asked questions

What are the most humid months in Wilsonville?

January, February and December, with an average relative humidity of 85%, are most humid months.

How much does it rain in Wilsonville?

In Wilsonville, during the entire year, the rain falls for 173.8 days and collects up to 29.96" (761mm) of precipitation.

When does it snow?

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

How many days does it snow?

In Wilsonville, during the entire year, snow falls for 6.1 days and aggregates up to 3.66" (93mm) of snow.

What are the months with the lowest UV index?

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

When does it snow the most?

February is the month with the most snowfall. Snow falls for 2.1 days and accumulates 1.26" (32mm) of snow.

What is the month with the least sunshine?

The month with the least sunshine is February, with an average of 4.2h of sunshine.

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?

April through October are months without snowfall.

When are the longest days?

The month with the longest days is June, with an average of 15h and 36min of daylight.

What is the driest month?

July and August are months with the least rain when the rain falls for 4.4 days and typically aggregates up to 0.31" (8mm) of rain.

What is the month with the highest UV index?

With an average maximum UV index of 6, July is the month with the highest UV index.

What are the warmest months?

The warmest temperatures occur during August, when averages reach a peak of 81°F (27.2°C) and a low of 54°F (12.2°C).

What is the least humid month?

August is the least humid month, with an average relative humidity of 65%.

What month has the most sunshine?

The month with the most sunshine is August, with an average of 11.1h of sunshine.

What are the coldest months?

Wilsonville notes the coldest temperatures in December, with a average high of 44.2°F (6.8°C) and a low of 34.3°F (1.3°C).

What is the wettest month?

The month with the most rainfall is December, when the rain falls for 19.4 days and typically aggregates up to 4.49" (114mm) of precipitation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 48min of daylight.

Average temperature
Wilsonville, OR

Average temperature - Wilsonville, OR

The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (44.2°F).

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).

Average pressure
Wilsonville, OR

Average pressure - Wilsonville, OR

The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

Average wind speed
Wilsonville, OR

Average wind speed - Wilsonville, OR

The windiest months (with the highest average wind speed) are January and February (5.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity
Wilsonville, OR

Average humidity - Wilsonville, OR

The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is August (65%).

Average rainfall
Wilsonville, OR

Average rainfall - Wilsonville, OR

The wettest month (with the highest rainfall) is December (4.49").
The driest months (with the least rainfall) are July and August (0.31").

Average rainfall days
Wilsonville, OR

Average rainfall days - Wilsonville, OR

The month with the highest number of rainy days is March (20.9 days).
The months with the least rainy days are July and August (4.4 days).

Average snowfall
Wilsonville, OR

Average snowfall - Wilsonville, OR

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

Average snowfall days
Wilsonville, OR

Average snowfall days - Wilsonville, OR

The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
Wilsonville, OR

Average daylight / Average sunshine - Wilsonville, OR

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

Average sunshine days
Wilsonville, OR

Average sunshine days - Wilsonville, OR

The month with the most sunshine days is July (25 days).
The month with the least sunshine days is March (8.3 days).

Average UV index
Wilsonville, OR

Average UV index - Wilsonville, 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).

Average visibility
Wilsonville, OR

Average visibility - Wilsonville, OR

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

Wilsonville, Oregon, USA

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