Gladstone (OR) Temperature by Month
Gladstone in Oregon, United States of America sees significant seasonal temperature differences, with daytime highs between 8°C (46°F) in December and 28°C (82°F) in July, averaging 18°C (64°F) annually. Explore the full monthly breakdown below.
Gladstone Monthly Temperatures
In Gladstone, temperatures can shift dramatically between warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 14°C (57°F) in July to 2°C (36°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Gladstone by month:
From around 4 AM to 6 AM temperatures are at their lowest; by 3 PM they've climbed to their daily peak. July, the warmest month, averages 332 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Gladstone vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
very warm
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Gladstone vs World: Temperature Compared
Gladstone's average annual maximum temperature is 18°C (64°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters — and seasons reversed compared to Europe.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
What Does the Temperature Feel Like in Gladstone?
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 Gladstone, December is the coolest month, with average highs of 8°C (46°F) and humidity around 83% — considered very high. In July, the warmest month, temperatures average 28°C (82°F) with 63% humidity — conditions that feel high. 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.
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 Gladstone this rarely lasts long on the ground.
For more on Gladstone's weather — including monthly rainfall, sunshine hours, and humidity — visit our Gladstone climate page.
