Ilwaco (WA) Temperature by Month

Ilwaco, Washington State, United States of America has an average annual maximum temperature of 14°C (57°F), with moderate seasonal shifts ranging from 9°C (48°F) in December to 19°C (66°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

Seasonal changes in Ilwaco bring a little variety without extreme temperature swings. Nighttime lows range from 12°C (54°F) in August to 3°C (37°F) in December.

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

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 299 hours of sunshine.

The chart below shows the average temperature throughout the year:

Ilwaco's average annual maximum temperature is 14°C (57°F). To put that in context, here's how it compares to a few well-known destinations:

Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

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.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Ilwaco this rarely lasts long on the ground.

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