New Castle County (Wilmington)
August
Weather in New Castle County, Delaware for August 2026
Your guide to New Castle County weather in August - trends and predictions
So far, August 2026 in New Castle County is slightly warmer than the historical average by 0.7 °F.
Expect cooler weather in the next days in New Castle County with the forecast suggesting a temperature of 26.4 °F, lower than the historical average.
In general, the average temperature in New Castle County at the beginning of August is 28.9 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 28 °F by the end of August.
New Castle County experiences moderate rainfall in August, with an average of 8 rainy days and a total precipitation of 466.3 mm.
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Temperatures
Rain 🌧️
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23
Dry days
8
Rainy days
0
Snow days
27°/18°
Temperatures
14 km/h
Avg max wind
71 %
Avg humidity
New Castle County Weather August
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Temperatures trend during August in New Castle County
See the weather trend as well as the moving average line
August weather in New Castle County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Moderate or heavy rain shower | 27° /17° | 181.9 mm | 7 | |
| Aug. 2 |  Overcast | 28° /19° | 3.9 mm | 10 | |
| Aug. 3 |  Fog | 30° /19° | 17.1 mm | 9 | |
| Aug. 4 | Fog | 31° /17° | 0 mm | 12 | |
| Aug. 5 | Overcast | 29° /20° | 8 mm | 8 | |
| Aug. 6 | Overcast | 29° /21° | 1.5 mm | 7 | |
| Aug. 7 | Overcast | 28° /21° | 0.9 mm | 8 | |
| Aug. 8 |  Partly cloudy | 29° /19° | 3.2 mm | 11 | |
| Aug. 9 | Partly cloudy | 32° /18° | 0 mm | 11 | |
| Aug. 10 | Mist | 31° /18° | 2.8 mm | 11 | |
| Aug. 11 | Mist | 30° /18° | 0.6 mm | 11 | |
| Aug. 12 | Mist | 32° /21° | 2.7 mm | 11 | |
| Aug. 13 | Moderate or heavy rain shower | 30° /21° | 11.5 mm | 7 | |
| Aug. 14 | Moderate or heavy rain shower | 30° /22° | 2.3 mm | 7 | |
| Aug. 15 |  Light rain shower | 30° /20° | 2.6 mm | 9 | |
| Aug. 16 | Mist | 26° /20° | 3 mm | 5 | |
| Aug. 17 |  Thundery outbreaks possible | 33° /20° | 50.4 mm | 5 | |
| Aug. 18 | Overcast | 26° /19° | 3 mm | 3 | |
| Aug. 19 | Overcast | 28° /18° | 0 mm | 8 | |
| Aug. 20 |  Light rain | 26° /19° | 37.4 mm | 5 | |
| Aug. 21 | Overcast | 24° /16° | 1.1 mm | 6 | |
| Aug. 22 |  Sunny | 26° /17° | 7.8 mm | 5 | |
| Aug. 23 | Sunny | 28° /16° | 4.7 mm | 7 | |
| Aug. 24 | Mist | 27° /16° | 0.2 mm | 9 | |
| Aug. 25 | Moderate or heavy rain shower | 28° /17° | 7.2 mm | 8 | |
| Aug. 26 | Overcast | 28° /16° | 0 mm | 7.7 | |
| Aug. 27 | Overcast | 27° /21° | 10.8 mm | 6.6 | |
| Aug. 28 | Light rain shower | 28° /21° | 13 mm | 6 | |
| Aug. 29 | Overcast | 25° /16° | 0 mm | 6 | |
| Aug. 30 | Sunny | 28° /18° | 0 mm | 7 | |
| Aug. 31 | Overcast | 32° /21° | 0 mm | 7 | |
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Important Notice
Our weather forecast for New Castle County in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the New Castle County forecast closer to your planned date for the most up-to-date weather information.
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New Castle County in August - FAQ
What are the expected maximum and minimum temperatures in New Castle County during August?
During August, expect a variety of temperatures with highs around 27° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in New Castle County during August?
Significant rainfall exceeding 466.3 mm is expected in New Castle County during August, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in New Castle County during August?
The average wind speed in New Castle County during August is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in New Castle County
Explore the daily rainfall trends and prepare for New Castle Countys August weather 💧
Typically, New Castle County has 8 rainy days in August with a total of 466.3 mm of rainfall.
UV exposure in New Castle County during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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Where is New Castle County?Get accurate weather forecasts for New Castle County, located at latitude 39.746 and longitude -75.547. Stay updated with localized weather information tailored for New Castle County.
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