Climate and monthly weather forecastWilsonville, OR
Climate and monthly weather forecast
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 »Updated: Aug 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, February and December, with an average relative humidity of 85%, are most humid months.
In Wilsonville, during the entire year, the rain falls for 173.8 days and collects up to 29.96" (761mm) of precipitation.
January through March, November and December are months with snowfall.
In Wilsonville, during the entire year, snow falls for 6.1 days and aggregates up to 3.66" (93mm) of snow.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the month with the most snowfall. Snow falls for 2.1 days and accumulates 1.26" (32mm) of snow.
The month with the least sunshine is February, with an average of 4.2h of sunshine.
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.
April through October are months without snowfall.
The month with the longest days is June, with an average of 15h and 36min of daylight.
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.
With an average maximum UV index of 6, July is the month with the highest UV index.
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).
August is the least humid month, with an average relative humidity of 65%.
The month with the most sunshine is August, with an average of 11.1h of sunshine.
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).
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.
The month with the shortest days is December, with an average of 8h and 48min of daylight.
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 in January:
30.12"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
30.07"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:
30.05"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.1"Hg
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 in January:
5.5mph - Average wind speed in February:
5.5mph - Average wind speed in March:
5.4mph - Average wind speed in April:
4.9mph - Average wind speed in May:
4.2mph - Average wind speed in June:
4mph
- Average wind speed in July:
4mph - Average wind speed in August:
3.8mph - Average wind speed in September:
4mph - Average wind speed in October:
4.7mph - Average wind speed in November:
5.4mph - Average wind speed in December:
5.3mph
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
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 in January:
4.21" - Average rainfall in February:
3.31" - Average rainfall in March:
3.5" - Average rainfall in April:
2.83" - Average rainfall in May:
1.73" - Average rainfall in June:
1.3"
- Average rainfall in July:
0.31" - Average rainfall in August:
0.31" - Average rainfall in September:
1.54" - Average rainfall in October:
3.15" - Average rainfall in November:
3.27" - Average rainfall in December:
4.49"
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 in January:
18.4 days - Average rainfall days in February:
16.8 days - Average rainfall days in March:
20.9 days - Average rainfall days in April:
18.7 days - Average rainfall days in May:
14.3 days - Average rainfall days in June:
11.9 days
- Average rainfall days in July:
4.4 days - Average rainfall days in August:
4.4 days - Average rainfall days in September:
9.9 days - Average rainfall days in October:
15.8 days - Average rainfall days in November:
18.9 days - Average rainfall days in December:
19.4 days
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
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 in January:
1.4 days - Average snowfall days in February:
2.1 days - Average snowfall days in March:
1.4 days - Average snowfall days in April:
0 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:
0.4 days - Average snowfall days in December:
0.8 days
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 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:
14h and 54min - Average daylight in June:
15h and 36min
- Average daylight in July:
15h and 12min - Average daylight in August:
14h and 0min - 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 48min
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).
- Average sunshine in January:
4h and 18min - Average sunshine in February:
4h and 12min - Average sunshine in March:
5h and 48min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
11h and 0min - Average sunshine in August:
11h and 6min - Average sunshine in September:
9h and 24min - Average sunshine in October:
5h and 30min - Average sunshine in November:
4h and 54min - Average sunshine in December:
4h and 18min
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 in January:
11 days - Average sunshine days in February:
8.6 days - Average sunshine days in March:
8.3 days - Average sunshine days in April:
9.3 days - Average sunshine days in May:
15.6 days - Average sunshine days in June:
16 days
- Average sunshine days in July:
25 days - Average sunshine days in August:
24.6 days - Average sunshine days in September:
18.1 days - Average sunshine days in October:
13.9 days - Average sunshine days in November:
10.3 days - Average sunshine days in December:
10.8 days
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
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 cloud cover
Wilsonville, OR
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 21).
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).
