New Castle County (Newark)
May
Weather in New Castle County, Delaware for May 2026
Your guide to New Castle County weather in May - trends and predictions
Until now, May 2026 in New Castle County is cooler than usual, with temperatures averaging 18.4 °F, this is -2.2 °F below the typical seasonal average.
The forecast for the coming days of May 2026 predicts a temperature of 25.8 °F , which is warmer than usual.
In general, the average temperature in New Castle County at the beginning of May is 20.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 24 °F by the end of May.
New Castle County experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 312.6 mm.
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Temperatures
Rain 🌧️
More
4
Dry days
27
Rainy days
0
Snow days
21°/13°
Temperatures
17 km/h
Avg max wind
78 %
Avg humidity
New Castle County Weather May
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Temperatures trend during May in New Castle County
See the weather trend as well as the moving average line
May weather in New Castle County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Light rain shower | 19° /9° | 1.8 mm | 6 | |
| May 2 |  Overcast | 22° /11° | 0.1 mm | 6 | |
| May 3 |  Sunny | 22° /11° | 1 mm | 7 | |
| May 4 |  Light drizzle | 19° /11° | 5.9 mm | 6 | |
| May 5 | Light rain | 21° /12° | 5 mm | 6 | |
| May 6 |  Fog | 22° /15° | 4.6 mm | 5 | |
| May 7 | Overcast | 21° /13° | 2.6 mm | 5 | |
| May 8 | Light rain shower | 24° /12° | 4.3 mm | 7 | |
| May 9 | Light rain shower | 19° /11° | 35.5 mm | 5 | |
| May 10 | Light rain shower | 20° /8° | 6 mm | 6 | |
| May 11 | Patchy rain possible | 18° /9° | 0.9 mm | 4 | |
| May 12 | Light rain shower | 20° /9° | 1.2 mm | 6 | |
| May 13 | Overcast | 21° /10° | 6.2 mm | 6 | |
| May 14 | Patchy rain possible | 17° /10° | 2.3 mm | 5.3 | |
| May 15 |  Partly cloudy | 18° /7° | 0 mm | 0.3 | |
| May 16 | Patchy rain possible | 24° /9° | 0.4 mm | 4 | |
| May 17 | Patchy rain possible | 26° /15° | 1.8 mm | 5 | |
| May 18 | Sunny | 31° /18° | 0 mm | 6 | |
| May 19 | Sunny | 32° /16° | 0 mm | 6 | |
| May 20 | Patchy rain possible | 28° /16° | 1.5 mm | 5 | |
| May 21 | Overcast | 22° /12° | 0 mm | 4 | |
| May 22 | Sunny | 24° /14° | 0 mm | 5 | |
| May 23 | Sunny | 25° /12° | 0 mm | 5 | |
| May 24 | Patchy rain possible | 32° /16° | 3.2 mm | 5 | |
| May 25 | Patchy rain possible | 31° /19° | 0.3 mm | 5 | |
| May 26 | Patchy rain possible | 31° /20° | 2 mm | 5 | |
| May 27 |  Moderate rain | 20° /12° | 12.6 mm | 4 | |
| May 28 | Patchy rain possible | 19° /13° | 47.5 mm | 5 | |
| May 29 |  Patchy light rain with thunder | 23° /13° | 1.8 mm | 5 | |
| May 30 | Light drizzle | 22° /14° | 7.3 mm | 5 | |
| May 31 | Partly cloudy | 22° /11° | 21.9 mm | 6 | |
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Important Notice
Our weather forecast for New Castle County in May 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.
Change Month
New Castle County in May - FAQ
What are the expected maximum and minimum temperatures in New Castle County during May?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in New Castle County during May?
Significant rainfall exceeding 312.6 mm is expected in New Castle County during May, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in New Castle County during May?
The average wind speed in New Castle County during May is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in New Castle County
Explore the daily rainfall trends and prepare for New Castle Countys May weather 💧
Typically, New Castle County has 27 rainy days in May with a total of 312.6 mm of rainfall.
UV exposure in New Castle County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Where is New Castle County?Get accurate weather forecasts for New Castle County, located at latitude 39.684 and longitude -75.75. Stay updated with localized weather information tailored for New Castle County.
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