Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
Weather Guide
New Castle, Delaware, United States Average Monthly Weather
Weather score49Mixed annual avg
Best months: August, July, June
Across the year, average daytime temperatures are around 17°C, sunshine averages 6.9h per day, and rainfall totals about 1121mm.
Annual weather
Annual averages
Temp
17°C
Rain
1121mm
Annual total
Sun
6.9h
Weather score
49
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 98mm, so some wet days are possible.
Bright
Sunshine averages 8.4h per day, so bright days are a strong part of the month.
Map
Weather map
Compare New Castle, Delaware, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August29°C average high
August is one of New Castle's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August98mm average rain
August sits near New Castle's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to June and August to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August8.4 hours average sun
August is brighter than New Castle's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
August79 weather score
August is one of New Castle's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
