Today | Weather | Wednesday, March 18, 2026

Weather in St. Paul, Minnesota

09:58 AM
Now
Cloudy Weather
27° F
Feels Like 27°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 89 %
Today
Cloudy Weather
Day 39°
Night 28°
Precipitation 1 %
Wind 6 mph
UV Index (0 - 11+) 3
Overnight Frost 1 AM – 9 AM
Tomorrow Morning Frost 1 AM – 6 AM

St. Paul Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (March 18, 2025)
Cloudy Weather

Day

50°

Night

32°

Wind

11 mph

UV Index

4

Precipitation

3 %

Air Quality in St. Paul

NOW
35 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 8.09 µg/m³
PM10 9.42 µg/m³
O3 0.038 ppm
NO2 2.7 ppb
SO2 0.3 ppb
CO 0.17 ppm
NH3 4.81 µg/m³
NO 2.27 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.58.09 µg/m³
PM109.42 µg/m³
O374.46 µg/m³
NO25.17 µg/m³
SO20.88 µg/m³
CO194.04 µg/m³
NH34.81 µg/m³
NO2.27 µg/m³