Best Time to Drive: Ukiah, CA to Riverside, CA

The best overall window to drive from Ukiah, CA to Riverside, CA is February to November. April is especially comfortable, and 8 AM to 11 AM is usually the easiest departure window.

Best overall window

February to November

This stretch gives the steadiest mix of comfort, daylight, and lower weather friction.

Easiest departure pattern

8 AM to 11 AM

Mid-morning is usually the steadiest all-around departure window.

Most challenging stretch

December

January is one of the harder months for this route because the weather friction stacks up faster.

Why This Route Scores Differently

This route is long enough that weather comfort across the whole day matters more than just departure conditions.

The current best window is February to November, when the drive is more likely to feel steady end to end.

This score uses multiple NOAA sample points along the route instead of a single state-wide climate average.

Month-by-Month Driving Conditions

Jan

Good 50°F

Feb

Good 53°F

Mar

Great 56°F

Apr

Excellent 60°F

May

Excellent 65°F

Jun

Great 70°F

Jul

Good 75°F

Aug

Great 75°F

Sep

Good 72°F

Oct

Great 65°F

Nov

Good 56°F

Dec

Fair 50°F

Best Good/Fair Challenging

Average Conditions by Month

January

Avg high / low 60 / 40°F

Moisture 3.9 in rain

Rating Good

Best departure

8 AM to 11 AM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Weather is mixed enough that departure timing still matters.

February

Avg high / low 64 / 42°F

Moisture 3.9 in rain

Rating Good

Best departure

8 AM to 11 AM

Steady driving window

Daytime temperatures usually stay in a comfortable driving range.

Weather is mixed enough that departure timing still matters.

March

Avg high / low 68 / 44°F

Moisture 2.9 in rain

Rating Great

Best departure

8 AM to 11 AM

Steady driving window

Daytime temperatures usually stay in a comfortable driving range.

Weather is mixed enough that departure timing still matters.

April

Avg high / low 72 / 47°F

Moisture 1.4 in rain

Rating Excellent

Best departure

8 AM to 11 AM

Steady driving window

Daytime temperatures usually stay in a comfortable driving range.

Rain disruption is usually limited compared with wetter months.

May

Avg high / low 78 / 52°F

Moisture 0.8 in rain

Rating Excellent

Best departure

8 AM to 11 AM

Steady driving window

Daytime temperatures usually stay in a comfortable driving range.

Rain disruption is usually limited compared with wetter months.

June

Avg high / low 84 / 57°F

Moisture 0.2 in rain

Rating Great

Best departure

8 AM to 11 AM

Steady driving window

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

July

Avg high / low 89 / 60°F

Moisture 0 in rain

Rating Good

Best departure

8 AM to 11 AM

Warm afternoons Holiday traffic

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

August

Avg high / low 89 / 60°F

Moisture 0 in rain

Rating Great

Best departure

8 AM to 11 AM

Warm afternoons

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

September

Avg high / low 87 / 57°F

Moisture 0.1 in rain

Rating Good

Best departure

8 AM to 11 AM

Warm afternoons

Temperatures are workable, but not as easy as the best shoulder-season windows.

Rain disruption is usually limited compared with wetter months.

October

Avg high / low 78 / 51°F

Moisture 1 in rain

Rating Great

Best departure

8 AM to 11 AM

Steady driving window

Daytime temperatures usually stay in a comfortable driving range.

Rain disruption is usually limited compared with wetter months.

November

Avg high / low 68 / 44°F

Moisture 2 in rain

Rating Good

Best departure

8 AM to 11 AM

Holiday traffic

Daytime temperatures usually stay in a comfortable driving range.

Rain disruption is usually limited compared with wetter months.

December

Avg high / low 60 / 40°F

Moisture 3.9 in rain

Rating Fair

Best departure

8 AM to 11 AM

Holiday traffic

Temperatures are workable, but not as easy as the best shoulder-season windows.

Weather is mixed enough that departure timing still matters.

Best Departure Time by Season

Spring

8 AM to 11 AM

Mid-morning is usually the steadiest all-around departure window.

Summer

8 AM to 11 AM

Mid-morning is usually the steadiest all-around departure window.

Fall

8 AM to 11 AM

Mid-morning is usually the steadiest all-around departure window.

Winter

8 AM to 11 AM

Mid-morning is usually the steadiest all-around departure window.

How This Score Was Built

Source

Route-sampled NOAA climate normals

High confidence. Built from 4 NOAA-backed route checkpoints rather than a single statewide estimate.

Origin zone

Pacific Coast

Destination zone

Pacific Coast

Route sample points

Late route

Late route checkpoint

CA UKIAH (0.3 mi away)

Late route

Late route checkpoint

CA RICHMOND (0.6 mi away)

Late route

Late route checkpoint

CA KETTLEMAN CITY (1.3 mi away)

Destination

Riverside, CA

CA RIVERSIDE CITRUS EXP (2.2 mi away)

Ready to plan? See the full trip plan from Ukiah, CA to Riverside, CA with stops, fuel costs, and directions.

Considering flying instead? Compare driving vs flying for this route.