Weather Forecast for Boulder
Colorado, United States of America
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Current Weather - Boulder: 21°C
Current Weather - Boulder: 21°C
Colorado, United States of America
Overcast
Feels like 21°C
Wind
8 km/h SW
Humidity
31%
Pressure
1012 mb
UV Index
1
Visibility
16 km
Partly Cloudy
Thursday, May 14, 2026
High
28°C
Low
12°C
Rain Chance
0%
Hourly Forecast
27°C
27°C
25°C
20°C
17°C
15°C
14°C
13°C
Day Statistics
Maximum Wind
35 km/h
Humidity
25%
Precipitation
0 mm
UV Index
9
Visibility
10 km
Rain Chance
0%
Snow Chance
0%
Sun & Moon
Sunrise
05:47 AM
Sunset
08:09 PM
Moonrise
04:04 AM
Moonset
06:00 PM
Moon Phase
Waning Crescent
Moon Illumination
11%
Air Quality
PM2.5
6.2
μg/m³
PM10
9.4
μg/m³
NO₂
7.9
μg/m³
O₃
90.6
μg/m³
SO₂
1.3
μg/m³
CO
147.9
μg/m³
Patchy rain nearby
Friday, May 15, 2026
High
27°C
Low
9°C
Rain Chance
82%
Hourly Forecast
12°C
11°C
10°C
10°C
9°C
9°C
10°C
14°C
17°C
19°C
21°C
23°C
25°C
26°C
27°C
27°C
26°C
24°C
21°C
18°C
15°C
14°C
13°C
12°C
Day Statistics
Maximum Wind
14 km/h
Humidity
24%
Precipitation
0 mm
UV Index
0
Visibility
10 km
Rain Chance
82%
Snow Chance
0%
Sun & Moon
Sunrise
05:46 AM
Sunset
08:10 PM
Moonrise
04:33 AM
Moonset
07:20 PM
Moon Phase
Waning Crescent
Moon Illumination
5%
Air Quality
PM2.5
5.4
μg/m³
PM10
8.5
μg/m³
NO₂
7.9
μg/m³
O₃
91.2
μg/m³
SO₂
1.2
μg/m³
CO
140.7
μg/m³
Patchy rain nearby
Saturday, May 16, 2026
High
22°C
Low
8°C
Rain Chance
87%
Hourly Forecast
12°C
11°C
11°C
11°C
11°C
10°C
12°C
14°C
16°C
17°C
19°C
20°C
20°C
20°C
21°C
21°C
18°C
17°C
15°C
12°C
10°C
10°C
9°C
8°C
Day Statistics
Maximum Wind
25 km/h
Humidity
45%
Precipitation
4 mm
UV Index
3
Visibility
10 km
Rain Chance
87%
Snow Chance
0%
Sun & Moon
Sunrise
05:45 AM
Sunset
08:11 PM
Moonrise
05:10 AM
Moonset
08:41 PM
Moon Phase
New Moon
Moon Illumination
1%
Air Quality
PM2.5
5.9
μg/m³
PM10
8.9
μg/m³
NO₂
6.7
μg/m³
O₃
106.3
μg/m³
SO₂
1.5
μg/m³
CO
148.9
μg/m³
Moderate rain
Sunday, May 17, 2026
High
17°C
Low
5°C
Rain Chance
87%
Hourly Forecast
8°C
8°C
7°C
6°C
6°C
6°C
9°C
11°C
13°C
14°C
14°C
14°C
15°C
15°C
14°C
12°C
11°C
10°C
10°C
9°C
8°C
8°C
8°C
8°C
Day Statistics
Maximum Wind
20 km/h
Humidity
73%
Precipitation
11 mm
UV Index
3
Visibility
9 km
Rain Chance
87%
Snow Chance
0%
Sun & Moon
Sunrise
05:44 AM
Sunset
08:12 PM
Moonrise
05:56 AM
Moonset
09:59 PM
Moon Phase
Waxing Crescent
Moon Illumination
0%
Air Quality
PM2.5
7.8
μg/m³
PM10
10
μg/m³
NO₂
9.5
μg/m³
O₃
86.1
μg/m³
SO₂
1.4
μg/m³
CO
174.8
μg/m³
Heavy rain
Monday, May 18, 2026
High
3°C
Low
-3°C
Rain Chance
87%
Hourly Forecast
7°C
7°C
6°C
5°C
4°C
3°C
2°C
2°C
2°C
2°C
2°C
2°C
3°C
3°C
3°C
3°C
3°C
3°C
3°C
1°C
-0°C
-1°C
-2°C
-3°C
Day Statistics
Maximum Wind
13 km/h
Humidity
95%
Precipitation
21 mm
UV Index
1
Visibility
5 km
Rain Chance
87%
Snow Chance
0%
Sun & Moon
Sunrise
05:43 AM
Sunset
08:12 PM
Moonrise
06:54 AM
Moonset
11:07 PM
Moon Phase
Waxing Crescent
Moon Illumination
2%
Air Quality
PM2.5
4
μg/m³
PM10
5
μg/m³
NO₂
8
μg/m³
O₃
86.5
μg/m³
SO₂
1.3
μg/m³
CO
161.6
μg/m³
Sunny
Tuesday, May 19, 2026
High
15°C
Low
-3°C
Rain Chance
0%
Hourly Forecast
-3°C
-3°C
-3°C
-3°C
-3°C
-3°C
-2°C
1°C
4°C
6°C
8°C
9°C
10°C
12°C
14°C
14°C
14°C
14°C
12°C
10°C
7°C
6°C
5°C
5°C
Day Statistics
Maximum Wind
14 km/h
Humidity
65%
Precipitation
0 mm
UV Index
3
Visibility
10 km
Rain Chance
0%
Snow Chance
0%
Sun & Moon
Sunrise
05:42 AM
Sunset
08:13 PM
Moonrise
08:04 AM
Moonset
No moonset
Moon Phase
Waxing Crescent
Moon Illumination
7%
Sunny
Wednesday, May 20, 2026
High
21°C
Low
3°C
Rain Chance
0%
Hourly Forecast
4°C
4°C
3°C
3°C
3°C
3°C
5°C
8°C
12°C
14°C
16°C
18°C
19°C
20°C
21°C
21°C
21°C
20°C
18°C
15°C
12°C
10°C
8°C
7°C
Day Statistics
Maximum Wind
25 km/h
Humidity
39%
Precipitation
0 mm
UV Index
4
Visibility
10 km
Rain Chance
0%
Snow Chance
0%
Sun & Moon
Sunrise
05:42 AM
Sunset
08:14 PM
Moonrise
09:20 AM
Moonset
12:03 AM
Moon Phase
Waxing Crescent
Moon Illumination
15%
Solar Radiation Data
Shortwave Radiation
66.22
Diffuse Radiation
35.07
DNI
34.42
GTI
48.83
Weather Alerts
Red Flag Warning issued May 13 at 11:43AM MDT until May 14 at 9:00PM MDT by NWS Denver CO
The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 11 AM to 9 PM MDT Thursday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 238, 242, 248, 250 and 251. * TIMING...From 11 AM to 9 PM MDT Thursday. * WINDS...Northwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire.
A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior.
Red Flag Warning issued May 14 at 3:51AM MDT until May 14 at 9:00PM MDT by NWS Denver CO
* AFFECTED AREA...Fire Weather Zones 238, 242, 248, 250 and 251. * TIMING...From 11 AM this morning to 9 PM MDT this evening. * WINDS...Northwest 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire.
A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior.
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