Climate and monthly weather forecast
Riverside, OR

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Weather in January

January is a cold winter month in Riverside, Oregon, with an average temperature fluctuating between 19.2°F (-7.1°C) and 32.7°F (0.4°C). Riverside's average high-temperature in January sits at a cold 32.7°F (0.4°C), showing little difference from the previous month. Weather in January »

Weather in February

The last month of the winter, February, is also an icy month in Riverside, Oregon, with an average temperature fluctuating between 23.2°F (-4.9°C) and 36.1°F (2.3°C). In February, the average high-temperature registers at a still cold 36.1°F (2.3°C), nearly identical to January's 32.7°F (0.4°C). Weather in February »

Weather in March

March, the first month of the spring in Riverside, is a frosty month, with an average temperature varying between 44.4°F (6.9°C) and 29.7°F (-1.3°C). With the onset of March, the average high-temperature subtly transitions from an icy 36.1°F (2.3°C) in February to a frosty 44.4°F (6.9°C). Weather in March »

Weather in April

April in Riverside, Oregon, is a fresh spring month, with an average temperature varying between 34°F (1.1°C) and 53.2°F (11.8°C). April's onset is marked by a subtle temperature increase, moving from a chilly 44.4°F (6.9°C) in March to a cool 53.2°F (11.8°C). Weather in April »

Weather in May

May, the last month of the spring in Riverside, is a refreshing month, with an average temperature varying between 41.9°F (5.5°C) and 63.5°F (17.5°C). Riverside's weather shows a temperature rise with the arrival of May, moving from a fresh 53.2°F (11.8°C) in April to a comfortable 63.5°F (17.5°C). Weather in May »

Weather in June

June, the first month of the summer in Riverside, is an agreeable month, with temperature in the range of an average low of 49.3°F (9.6°C) and an average high of 72.7°F (22.6°C). With the arrival of June, the average high-temperature transitions from a refreshing 63.5°F (17.5°C) in May to a pleasant 72.7°F (22.6°C). Weather in June »

Weather in July

July in Riverside, Oregon, is a warm summer month, with an average temperature ranging between min 58.8°F (14.9°C) and max 85.3°F (29.6°C). In Riverside, July is the month with the highest recorded average temperatures, measuring a high of 85.3°F (29.6°C) and a low of 58.8°F (14.9°C). Weather in July »

Weather in August

August, the last month of the summer in Riverside, is also a moderately hot month, with an average temperature ranging between max 83.5°F (28.6°C) and min 59°F (15°C). The dawn of August sees an average high-temperature of a still moderately hot 83.5°F (28.6°C), subtly contrasting with July's 85.3°F (29.6°C). Weather in August »

Weather in September

September, the first month of the autumn in Riverside, is still a pleasant month, with an average temperature ranging between max 73°F (22.8°C) and min 51.8°F (11°C). The arrival of September corresponds with a reduction in the average high-temperature, down from August's moderately hot 83.5°F (28.6°C) to an agreeable 73°F (22.8°C). Weather in September »

Weather in October

October, like September, is a moderate autumn month in Riverside, Oregon, with an average temperature fluctuating between 56.8°F (13.8°C) and 39.7°F (4.3°C). The arrival of October brings a significant change in Riverside's weather, with average high-temperatures dropping from September's agreeable 73°F (22.8°C) to a refreshing 56.8°F (13.8°C). Weather in October »

Weather in November

November, the last month of the autumn in Riverside, is also an icy month, with an average temperature fluctuating between 42.6°F (5.9°C) and 28.8°F (-1.8°C). November's arrival corresponds with a decrease in average high-temperatures, from October's refreshing 56.8°F (13.8°C) to an icy 42.6°F (5.9°C). Weather in November »

Weather in December

December, the first month of the winter in Riverside, is still a freezing cold month, with an average temperature varying between 31.8°F (-0.1°C) and 19.4°F (-7°C). The coldest month is December, with an average high-temperature of 31.8°F (-0.1°C) and an average low-temperature of 19.4°F (-7°C). Weather in December »
Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the most humid month?

The most humid month in Riverside is January, with an average relative humidity of 85%.

How much does it rain?

In Riverside, during the entire year, the rain falls for 109.9 days and collects up to 11.34" (288mm) of precipitation.

When does it snow?

Months with snowfall are January through May, November and December.

How many days does it snow?

In Riverside, during the entire year, snow falls for 46.8 days and aggregates up to 25.75" (654mm) of snow.

What are the months with the lowest UV index?

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

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 MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.

When it does not snow?

In Riverside, snow does not fall in June through October.

When are the longest days?

The month with the longest days is June, with an average of 15h and 24min of daylight.

What is the hottest time of year?

Temperature records mark July as the warmest month, with highs averaging 85.3°F (29.6°C) and lows at 58.8°F (14.9°C).

What are the least humid months?

July and August, with an average relative humidity of 31%, are the least humid months.

What is the driest month in Riverside?

July is the month with the least rainfall. Rain falls for 3.4 days and accumulates 0.12" (3mm) of precipitation.

What month has the most sunshine?

The month with the most sunshine in Riverside is July, with an average of 12h of sunshine.

When is the highest UV index?

The month with the highest UV index is July, with an average maximum UV index of 7.

What part of the year is the coldest?

December tends to be the coldest month, with temperatures averaging a daily high of 31.8°F (-0.1°C) and a low of 19.4°F (-7°C).

What is the rainiest month?

The month with the most rainfall is December, when the rain falls for 9.3 days and typically aggregates up to 1.77" (45mm) of precipitation.

When does it snow the most?

The month with the most snowfall is December, when snow falls for 13.1 days and typically aggregates up to 9.13" (232mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 0min of daylight.

What is the month with the least sunshine?

With an average of 5.1h of sunshine, December has the least sunshine of the year.

Average temperature
Riverside, OR

Average temperature - Riverside, OR

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (31.8°F).

The month with the highest average low temperature is August (59°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).

Average pressure
Riverside, OR

Average pressure - Riverside, OR

The month with the highest atmospheric pressure is January (30.23"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).

Average wind speed
Riverside, OR

Average wind speed - Riverside, OR

The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest month (with the lowest average wind speed) is January (5mph).

Average humidity
Riverside, OR

Average humidity - Riverside, OR

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (31%).

Average rainfall
Riverside, OR

Average rainfall - Riverside, OR

The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is July (0.12").

Average rainfall days
Riverside, OR

Average rainfall days - Riverside, OR

The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is July (3.4 days).

Average snowfall
Riverside, OR

Average snowfall - Riverside, OR

The month with the highest snowfall is December (9.13").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days
Riverside, OR

Average snowfall days - Riverside, OR

The month with the highest number of snowfall days is December (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Riverside, OR

Average daylight / Average sunshine - Riverside, OR

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

Average sunshine days
Riverside, OR

Average sunshine days - Riverside, OR

The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is March (11.5 days).

Average UV index
Riverside, OR

Average UV index - Riverside, OR

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average visibility
Riverside, OR

Average visibility - Riverside, OR

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).

Riverside, Oregon, USA

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