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Portland, OR vs Riverside, CA weather comparison

Portland

OR

Riverside endures about 96 more days above 90 °F each year.

Riverside sees rain or snow on roughly 127 fewer days each year. Riverside enjoys about 124 more sunny days a year than Portland.

The year at a glance

Averages from 30 years of climate history, 1991-2020

Annual weather statistics for Portland, OR and Riverside, CA
PortlandMetricRiverside
160 daysSunny daysclear or partly cloudy skies284 days
37 inPrecipitationper year10 in
157 daysWet daysrain or snow per year30 days
6 inSnowfallper year0 in
13 daysHot daysabove 90 °F108 days
22 daysFreezing nightsat or below 32 °F3 days
76%Humidityaverage relative62%
55 °FAverage temperatureyear round67 °F

Monthly temperatures

Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.

PortlandRiverside

Daily highs

6080100JanMarMayJulSepNovPortland, Jan: 47 °FPortland, Feb: 51 °FPortland, Mar: 56 °FPortland, Apr: 61 °FPortland, May: 68 °FPortland, Jun: 73 °FPortland, Jul: 81 °FPortland, Aug: 81 °FPortland, Sep: 75 °FPortland, Oct: 63 °FPortland, Nov: 53 °FPortland, Dec: 46 °FRiverside, Jan: 70 °FRiverside, Feb: 69 °FRiverside, Mar: 73 °FRiverside, Apr: 78 °FRiverside, May: 81 °FRiverside, Jun: 89 °FRiverside, Jul: 95 °FRiverside, Aug: 97 °FRiverside, Sep: 93 °FRiverside, Oct: 84 °FRiverside, Nov: 76 °FRiverside, Dec: 69 °F

Daily lows

405060JanMarMayJulSepNovPortland, Jan: 37 °FPortland, Feb: 38 °FPortland, Mar: 40 °FPortland, Apr: 44 °FPortland, May: 49 °FPortland, Jun: 53 °FPortland, Jul: 58 °FPortland, Aug: 58 °FPortland, Sep: 55 °FPortland, Oct: 47 °FPortland, Nov: 41 °FPortland, Dec: 37 °FRiverside, Jan: 43 °FRiverside, Feb: 44 °FRiverside, Mar: 46 °FRiverside, Apr: 50 °FRiverside, May: 55 °FRiverside, Jun: 59 °FRiverside, Jul: 64 °FRiverside, Aug: 64 °FRiverside, Sep: 62 °FRiverside, Oct: 55 °FRiverside, Nov: 47 °FRiverside, Dec: 42 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Portland high475156616873818175635346
Riverside high706973788189959793847669
Portland low373840444953585855474137
Riverside low434446505559646462554742

Monthly precipitation

Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.

PortlandRiverside
0.02.04.06.0JanMarMayJulSepNovPortland, Jan: 5.1 inPortland, Feb: 4.0 inPortland, Mar: 4.4 inPortland, Apr: 3.5 inPortland, May: 2.1 inPortland, Jun: 1.3 inPortland, Jul: 0.4 inPortland, Aug: 0.4 inPortland, Sep: 1.3 inPortland, Oct: 3.2 inPortland, Nov: 5.3 inPortland, Dec: 5.9 inRiverside, Jan: 2.1 inRiverside, Feb: 2.4 inRiverside, Mar: 1.5 inRiverside, Apr: 0.7 inRiverside, May: 0.3 inRiverside, Jun: 0.1 inRiverside, Jul: 0.0 inRiverside, Aug: 0.0 inRiverside, Sep: 0.1 inRiverside, Oct: 0.5 inRiverside, Nov: 0.7 inRiverside, Dec: 1.5 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Portland5.14.04.43.52.11.30.40.41.33.25.35.9
Riverside2.12.41.50.70.30.10.00.00.10.50.71.5

Monthly sunny days

Days each month with clear or partly cloudy skies, so compare the same month between cities.

PortlandRiverside
0102030JanMarMayJulSepNovPortland, Jan: 7 daysPortland, Feb: 8 daysPortland, Mar: 8 daysPortland, Apr: 9 daysPortland, May: 13 daysPortland, Jun: 15 daysPortland, Jul: 24 daysPortland, Aug: 25 daysPortland, Sep: 21 daysPortland, Oct: 15 daysPortland, Nov: 8 daysPortland, Dec: 7 daysRiverside, Jan: 19 daysRiverside, Feb: 16 daysRiverside, Mar: 18 daysRiverside, Apr: 21 daysRiverside, May: 24 daysRiverside, Jun: 27 daysRiverside, Jul: 29 daysRiverside, Aug: 30 daysRiverside, Sep: 28 daysRiverside, Oct: 26 daysRiverside, Nov: 24 daysRiverside, Dec: 21 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Portland788913152425211587
Riverside191618212427293028262421

Keep comparing

Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.

Portland vs another city

See the full Portland, OR climate profile

More Oregon cities

Riverside vs another city

See the full Riverside, CA climate profile

More California cities

About this data

Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).