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Weather in New Castle County, Delaware for May 2026

Your guide to New Castle County weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in New Castle County at the beginning of May is 21.7 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 22.6 °F by the end of May.

  • Rain 🌧️

  • New Castle County in May brings notable rainfall, with an average of 18 rainy days and a total precipitation of 134.1 mm.

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Average dry days
13
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/13°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
80 %
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
Light rain shower
21° /12° 2.7 mm 5
May 2 Overcast
Overcast
26° /14° 0 mm 6
May 3 Sunny
Sunny
25° /14° 1.5 mm 6
May 4 Light drizzle
Light drizzle
18° /14° 8.8 mm 4
May 5 Light rain
Light rain
18° /12° 7.5 mm 4
May 6 Fog
Fog
22° /15° 4.1 mm 5
May 7 Light rain shower
Light rain shower
22° /15° 2.3 mm 5
May 8 Light rain shower
Light rain shower
26° /15° 6.4 mm 6
May 9 Light rain shower
Light rain shower
19° /12° 52.9 mm 5
May 10 Light rain shower
Light rain shower
18° /7° 7.8 mm 5
May 11 Patchy rain possible
Patchy rain possible
20° /10° 1.2 mm 5
May 12 Light rain shower
Light rain shower
20° /11° 1.8 mm 5
May 13 Mist
Mist
21° /11° 5.9 mm 5
May 14 Light rain
Light rain
19° /13° 38.5 mm 4
May 15 Light rain
Light rain
20° /16° 10.3 mm 5
May 16 Light drizzle
Light drizzle
21° /15° 10 mm 5
May 17 Patchy rain possible
Patchy rain possible
24° /16° 3.7 mm 6
May 18 Light rain
Light rain
19° /13° 3 mm 5
May 19 Patchy rain possible
Patchy rain possible
23° /12° 0.1 mm 6
May 20 Mist
Mist
21° /10° 0 mm 5
May 21 Sunny
Sunny
20° /11° 31.5 mm 5
May 22 Sunny
Sunny
23° /12° 14.7 mm 6
May 23 Light rain shower
Light rain shower
21° /13° 4.1 mm 5
May 24 Mist
Mist
22° /12° 0 mm 5
May 25 Light rain shower
Light rain shower
24° /12° 1.9 mm 6
May 26 Light rain shower
Light rain shower
25° /15° 5.6 mm 6
May 27 Patchy light rain with thunder
Patchy light rain with thunder
23° /15° 8 mm 5
May 28 Patchy rain possible
Patchy rain possible
19° /13° 47.5 mm 5
May 29 Patchy light rain with thunder
Patchy light rain with thunder
23° /13° 1.8 mm 5
May 30 Light drizzle
Light drizzle
22° /14° 7.3 mm 5
May 31 Partly cloudy
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.

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 134.1 mm is expected in New Castle County during May, occurring over more than 18 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 15 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 💧

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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Location coordinates 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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