Newcastle (OK) Temperature by Month
The average annual maximum temperature in Newcastle, Oklahoma, United States of America is 23°C (73°F), with daytime highs ranging from 10°C (50°F) in January to 34°C (93°F) in August. This page covers monthly averages, day-night differences, and how Newcastle compares to cities worldwide.
Newcastle Monthly Temperatures
With significant temperature fluctuations, Newcastle enjoys distinct seasons year-round. Nighttime lows range from 22°C (72°F) in August to -3°C (27°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Newcastle by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. August, the warmest month, gets 338 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Newcastle 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.
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Newcastle vs World: Temperature Compared
Newcastle's average annual maximum temperature is 23°C (73°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.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
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.
What Does the Temperature Feel Like in Newcastle?
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 Newcastle, January is the coolest month, with average highs of 10°C (50°F) and humidity around 62% — considered high. In August, the warmest month, temperatures average 34°C (93°F) with 48% 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.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Newcastle's weather — including monthly rainfall, sunshine hours, and humidity — visit our Newcastle climate page.
