Thornton, CO Weather Forecast
Right now it is 48°F and mostly cloudy in Thornton (as of Tue, 9:48 AM MST). This Afternoon: high near 56°F. Tomorrow: mostly sunny, high near 56°F. Official NWS forecast and alerts, refreshed every 30 minutes.
Current conditions
Measured at Broomfield / Jeffco (9 mi from the city center).
Weather tomorrow in Thornton
Mostly Sunny
10% chance of rain/snow56°FMostly sunny. High near 56, with temperatures falling to around 53 in the afternoon. North wind 2 to 6 mph.
Mostly Cloudy37°FMostly cloudy, with a low around 37. Northwest wind around 5 mph.
Weather alerts
No active National Weather Service watches, warnings or advisories for Thornton right now.
7-day forecast
Sunny56°F / 36°FSunny. High near 56, with temperatures falling to around 52 in the afternoon. Northeast wind around 5 mph. Tonight: Mostly clear, with a low around 36. South wind around 3 mph.
Mostly Sunny 10% chance of rain/snow56°F / 37°FMostly sunny. High near 56, with temperatures falling to around 53 in the afternoon. North wind 2 to 6 mph. Wednesday Night: Mostly cloudy, with a low around 37. Northwest wind around 5 mph.
Sunny57°F / 37°FSunny, with a high near 57. South wind around 5 mph. Thursday Night: Partly cloudy, with a low around 37.
Mostly Sunny57°F / 36°FMostly sunny, with a high near 57. Friday Night: Mostly clear, with a low around 36.
Sunny59°F / 36°FSunny, with a high near 59. Saturday Night: Mostly clear, with a low around 36.
Sunny67°F / 41°FSunny, with a high near 67. Sunday Night: Mostly clear, with a low around 41.
Sunny65°F / 41°FSunny, with a high near 65. Monday Night: Partly cloudy, with a low around 41.
Forecast issued by NWS forecast office BOU · updated Nov 3, 11:46 AM MST. Daytime highs and overnight lows are on the right.
Hourly forecast, radar & more on weather.gov
Nearby cities
Thornton population: 147,766 (U.S. Census Bureau, July 1, 2025 estimate). More Colorado cities · All US cities
Source: National Weather Service / NOAA (public domain), fetched live. Tachlis is not affiliated with the NWS.
Questions & answers
What is the weather tomorrow in Thornton?
Wednesday, November 4: Mostly Sunny, high near 56°F; night: mostly cloudy, low around 37°F.
Where does the Thornton forecast come from?
From the National Weather Service forecast office BOU, which writes the official forecast for Thornton's 2.5 km grid square. Current conditions come from the nearest NWS/FAA weather station.
How often is the Thornton weather updated?
This page fetches fresh data from the National Weather Service at most every 30 minutes, and checks for new watches and warnings every 5 minutes.
What time zone are the times shown in?
Local time for Thornton (America/Denver).
Why can the current temperature differ from the forecast?
The current reading is a real measurement at a weather station, often at an airport, while the forecast describes the whole grid square around the city. Temperatures can differ by a few degrees across a city.