New Castle, Colorado Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
New Castle weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Clear——91°57°—
- SundayJul 5Overcast——94°69°+3°
- MondayJul 6Light Drizzle——96°67°+2°
- TuesdayJul 7Overcast10%—97°58°+1°
- WednesdayJul 8Overcast15%—98°59°+1°
- ThursdayJul 9Partly Cloudy——96°57°-2°
- FridayJul 10Mostly Clear——98°55°+2°
AQI 91 (Moderate), driven by Ozone. AQI up 13 over the last 6 hours (gradual rise). Ozone at AQI 63 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 15 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 63 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 15 around 1 PM.
- Present
- AQI 63
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 15
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:29 PM
- Moonset
- 11:25 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
New Castle at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 13 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 81647
16-Day Forecast — New Castle
- Sat91°57°1%
- Sun94°69°1%
- Mon96°67°4%
- Tue97°58°10%
- Wed98°59°15%
- Thu96°57°9%
- Fri98°55°3%
- Sat103°53°2%
- Sun105°57°7%
- Mon107°63°14%
- Tue108°61°17%
- Wed109°64°53%
- Thu105°64°55%
- Fri105°62°52%
- Sat98°61°52%
- Sun100°59°32%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — New Castle
SPC includes New Castle in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in New Castle
- 81647