Seaford (DE) Temperature by Month
Seaford in Delaware, United States of America sees significant seasonal temperature differences, with daytime highs between 7°C (45°F) in February and 31°C (88°F) in July, averaging 20°C (68°F) annually. Explore the full monthly breakdown below.
Seaford Monthly Temperatures
Depending on the time of the year, temperatures range from very warm to cold in Seaford. At night, minimum temperatures range from 21°C (70°F) in July to -3°C (27°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Seaford by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Seaford 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
warm
pleasant
moderate
cold
very cold
Seaford vs World: Temperature Compared
Seaford's average annual maximum temperature is 20°C (68°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
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 Seaford?
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 Seaford, February is the coolest month, with average highs of 8°C (46°F) and humidity around 68% — considered high. In July, the warmest month, temperatures average 31°C (88°F) with 74% 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 Seaford this rarely lasts long on the ground.
For more on Seaford's weather — including monthly rainfall, sunshine hours, and humidity — visit our Seaford climate page.
