Spokane Valley (WA) Temperature by Month

Spokane Valley in Washington State, United States of America sees significant seasonal temperature differences, with daytime highs between 2°C (36°F) in December and 30°C (86°F) in July, averaging 15°C (59°F) annually. Explore the full monthly breakdown below.

With significant temperature fluctuations, Spokane Valley enjoys distinct seasons year-round. Nighttime lows range from 13°C (55°F) in July to -4°C (25°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Spokane Valley by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. July, the warmest month, sees 383 hours of sunshine.

The chart below shows the average temperature throughout the year:

Spokane Valley's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Spokane Valley, December is the coolest month, with average highs of 2°C (36°F) and humidity around 86%, considered very high. In July, the warmest month, temperatures average 30°C (86°F) with 44% humidity, conditions that feel moderate. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Spokane Valley's weather, including monthly rainfall, sunshine hours, and humidity, visit our Spokane Valley climate page.