Local weather forecast

Weather in New Castle, DE

Updated 2026-08-11 11:15 local time · ZIP codes 19720

Sunny
Now84°F

Sunny

High / Low89° / 70°
Rain chance17%
Wind4 mph
Weather alerts

Active alerts

2
Coastal Flood Advisory issued August 11 at 3:23AM EDT until August 12 at 2:00AM EDT by NWS Mount Holly NJ

* WHAT...Up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. * WHERE...In Delaware, New Castle. In New Jersey, Salem. * WHEN...From 9 PM this evening to 2 AM EDT Wednesday. * IMPACTS...At this level, flooding begins on the most vulnerable roads along tidal waterways. Some partial or full road closures are possible. * ADDITIONAL DETAILS...Elevated tides due to the approach of the New Moon on August 12th may lead to minor coastal flooding during the evening high tides through the Thursday.

Safety instructions

A Coastal Flood Advisory means that minor tidal flooding is expected. Minor tidal flooding often results in some road closures. Usually, the most vulnerable roadways will flood. Do not leave your vehicle at a location that is prone to tidal flooding. Do not drive your vehicle through flood waters. The water may be deeper than you think it is. You will be putting yourself in danger and your vehicle may be damaged, leading to costly repairs. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.

Coastal Flood Advisory issued August 11 at 3:23AM EDT until August 12 at 12:00AM EDT by NWS Mount Holly NJ

* WHAT...Up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. * WHERE...In Delaware, Kent, Inland Sussex and Delaware Beaches. In New Jersey, Cumberland, Cape May and Atlantic Coastal Cape May. * WHEN...From 6 PM this evening to midnight EDT tonight. * IMPACTS...At this level, flooding begins on the most vulnerable roads in coastal and bayside communities, and along inland tidal waterways. Some partial or full road closures are possible. * ADDITIONAL DETAILS...Elevated tides due to the approach of the New Moon on August 12th may lead to minor coastal flooding during the evening high tides through the Thursday.

Safety instructions

A Coastal Flood Advisory means that minor tidal flooding is expected. Minor tidal flooding often results in some road closures. Usually, the most vulnerable roadways will flood. Do not leave your vehicle at a location that is prone to tidal flooding. Do not drive your vehicle through flood waters. The water may be deeper than you think it is. You will be putting yourself in danger and your vehicle may be damaged, leading to costly repairs. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.

Hourly

Next hours

NowSunny84°7% rain
12 PMSunny86°7% rain
1 PMSunny87°6% rain
2 PMSunny89°4% rain
3 PMSunny87°4% rain
4 PMSunny87°5% rain
5 PMSunny87°4% rain
6 PMPartly Cloudy85°6% rain
7 PMSunny84°5% rain
8 PMSunny79°8% rain
9 PMClear77°10% rain
10 PMClear77°10% rain
Forecast

3-day weather forecast

Today2026-08-11
Sunny
89° 70°Sunny
Rain 17%Gust 15 mph
Tomorrow2026-08-12
Sunny
87° 68°Sunny
Rain 57%Gust 9 mph
Thursday2026-08-13
Sunny
88° 70°Sunny
Rain 57%Gust 10 mph
Conditions

Weather details

Feels like93°F
Humidity75%
Pressure29.91 inHg
Visibility6 mi
Wind4 mph WNW
Wind gusts5 mph
Precipitation0.00 in
UV index4
Daylight

Sunrise, sunset and moon

Sunrise06:11 AM
Sunset08:04 PM
Moonrise04:10 AM
Moon phaseNew Moon
Practical guide

Weather insights for today

Umbrella not essential

Rain chance stays relatively low over the next 12 hours (up to 10%).

Choose light, breathable clothing

It feels like 93°F with winds near 4 mph.

Best window: 8 PM

79°F, 8% rain chance and 1 mph wind.

Allow a little extra driving time

Visibility is around 6 mi; gusts may reach 12 mph.

Run with a few weather adjustments

Current temperature is 84°F, wind 4 mph, rain chance up to 10%.

Moderate UV protection recommended

UV index is 4. Sunscreen and sunglasses are sensible for longer outdoor time.

New Castle weather today

Sunny and 84°F in New Castle, DE. Today's high is 89°F with a 17% rain chance. Winds are around 4 mph with gusts near 5 mph. Relative humidity is 75%, pressure is 29.91 inHg, and visibility is about 6 miles.

Tonight and tomorrow in New Castle

Sunrise is at 06:11 AM and sunset is at 08:04 PM. Tomorrow's forecast calls for Sunny with a high near 87°F and a low near 68°F. The maximum rain chance is 57%.

Nearby

Weather near New Castle

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