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New Castle, DE Weather Forecast | 5 Day

Updated: Fri Sep 18th 2026 3:00 PM EDT

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Overcast

Fri 9-18-26

Overcast with a high of 78°F and a low of 68°F. There might be light rainfall having a 17% chance with an estimated 0in. Wind will be moderate, blowing around 11mph on average and gusts of 23.5mph at 11 PM. The humidity will be on the higher side, averaging about 76%, the maximum being 71% at 8 PM and 61% being its lowest at 10 PM. Barometric pressure is its highest of 30.1^inHg at 9 PM, a lowest point of 30.05^inHg at 5 PM with an avg 30.07^inHg.

HI: 78°F
LO: 68°F

Rainfall: 17% | est. 0in
Snowfall: 0%

Wind
10.5 mph
Humidity
76% avg.

UV Index
7.2
Air Quality
Good

Sunrise
06:46 AM
Sunset
07:06 PM

Moonrise
02:55 PM
Moonset
11:44 PM
Moon Phase
First Quarter

Sunny

Weather Tomorrow, Sat 9-19-26

Sunny with a high of 76°F and a low of 60°F. There's a very small chance of rainfall, only about 5% with an estimated 0in. Wind will be moderate, blowing around 11mph on average and gusts of 23.9mph at 12 AM. Humidity levels should be comfortable, sitting around 57% on average, the maximum being 80% at 11 PM and 40% being its lowest at 2 PM. Barometric pressure is its highest of 30.18^inHg at 10 AM, a lowest point of 30.09^inHg at 1 AM with an avg 30.13^inHg.

HI: 76°F
LO: 60°F

Rainfall: 5% | est. 0in
Snowfall: 0%

Wind
10.3 mph
Humidity
57% avg.

UV Index
7
Air Quality
Good

Sunrise
06:47 AM
Sunset
07:05 PM

Moonrise
03:41 PM
Moonset
Does not set today
Moon Phase
First Quarter

Overcast

Sun 9-20-26

Overcast with a high of 74°F and a low of 61°F. There's a moderate 30% chance of rainfall with an estimated 0in. Wind will be moderate, blowing around 13mph on average and gusts of 21.1mph at 5 PM. High humidity with average of 81% is anticipated, the maximum being 88% at 11 PM and 72% being its lowest at 3 PM. Barometric pressure is its highest of 30.14^inHg at 1 AM, a lowest point of 29.93^inHg at 6 PM with an avg 30.04^inHg.

HI: 74°F
LO: 61°F

Rainfall: 30% | est. 0in
Snowfall: 0%

Wind
12.3 mph
Humidity
81% avg.

UV Index
5.3
Air Quality
Good

Sunrise
06:48 AM
Sunset
07:03 PM

Moonrise
04:18 PM
Moonset
12:43 AM
Moon Phase
Waxing Gibbous

Scattered Showers

Mon 9-21-26

Scattered Showers with a high of 71°F and a low of 63°F. It will likey rain, having a 81% chance of a downpour with an estimated 0.12in. Wind will be moderate, blowing around 11mph on average and gusts of 24mph at 9 PM. High humidity with average of 86% is anticipated, the maximum being 98% at 4 AM and 68% being its lowest at 11 AM. Barometric pressure is its highest of 30.1^inHg at 10 PM, a lowest point of 29.94^inHg at 2 AM with an avg 30.03^inHg.

HI: 71°F
LO: 63°F

Rainfall: 81% | est. 0.12in
Snowfall: 0%

Wind
10.5 mph
Humidity
86% avg.

UV Index
5.4
Air Quality
Good

Sunrise
06:49 AM
Sunset
07:01 PM

Moonrise
04:50 PM
Moonset
01:45 AM
Moon Phase
Waxing Gibbous

Scattered Showers

Tue 9-22-26

Scattered Showers with a high of 64°F and a low of 56°F. It will likey rain, having a 92% chance of a downpour with an estimated 0.4in. Wind will be moderate, blowing around 16mph on average and gusts of 31.8mph at 6 PM. High humidity with average of 92% is anticipated, the maximum being 97% at 3 AM and 84% being its lowest at 9 PM. Barometric pressure is its highest of 30.31^inHg at 11 PM, a lowest point of 30.09^inHg at 2 AM with an avg 30.18^inHg.

HI: 64°F
LO: 56°F

Rainfall: 92% | est. 0.4in
Snowfall: 0%

Wind
15.2 mph
Humidity
92% avg.

UV Index
4
Air Quality
Good

Sunrise
06:50 AM
Sunset
07:00 PM

Moonrise
05:16 PM
Moonset
02:47 AM
Moon Phase
Waxing Gibbous

Light Rain Shower

Wed 9-23-26

Light Rain Shower with a high of 67°F and a low of 56°F. It will likey rain, having a 82% chance of a downpour with an estimated 0.25in. Wind will be moderate, blowing around 11mph on average and gusts of 27.3mph at 12 AM. The humidity will be on the higher side, averaging about 77%, the maximum being 90% at 5 AM and 66% being its lowest at 2 PM. Barometric pressure is its highest of 30.35^inHg at 10 AM, a lowest point of 30.3^inHg at 2 AM with an avg 30.32^inHg.

HI: 67°F
LO: 56°F

Rainfall: 82% | est. 0.25in
Snowfall: 0%

Wind
11 mph
Humidity
77% avg.

UV Index
4
Air Quality
TBA

Sunrise
06:51 AM
Sunset
06:58 PM

Moonrise
05:39 PM
Moonset
03:48 AM
Moon Phase
Waxing Gibbous

New Castle, DE Weather Forecast - 10 Day Detailed

This 5-Day weather forecast is relevant for ZIP codes 19720 and 19721, accurately covering areas of New Castle, DE.

Currently

	75°F	30.06 inHg. Barometer 64% Humidity N 15.5 mph Wind
Overcast

Full Report

National Outlook

Heavy Rain in North-Central U.S. & Scorching Heat in South-Central U.S. - 09-18 to 09-20

Fri Sep 18th 2026, 5:45am PDT

Read

Wet Weather with Possible Flood Concerns in the Southern Regions 09-21 to 09-25

Extended Forecast
Fri Sep 18th 2026, 5:56am PDT

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5 Day Forecast Nearby

Delaware

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