Today | Weather | Thursday, September 4, 2025

Weather in Fort Collins, Colorado

11:35 AM
Now
Cloudy WeatherCloudy weather, overcast skies with clouds.
84° F
Feels Like 90°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 11
Humidity 28 %
Today
Cloudy WeatherCloudy weather, overcast skies with clouds.
Day 90°
Night 52°
Precipitation 2 %
Wind 7 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Other:

More sun than cloud cover.

Fort Collins Weather Forecast Updated

Last updated on

Weather Forecast History

Last Year's Weather on This Day (September 4, 2024)

Stormy WeatherStormy weather, thunderstorms.

Day

82°

Night

55°

Wind

9 mph

UV Index

6

Precipitation

70

Air quality in Fort Collins

NOW
65 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 14.62 µg/m³
PM10 31.31 µg/m³
O₃ 42.77 ppb
NO₂ 8.50 ppb
SO₂ 0.18 ppb
CO 211.18 ppb
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.