Boulder, CO Weather Forecast

The forecast is bbbrraaaiiinnsss....

🌪 TROPICAL ACTIVITY: TROPICAL STORM FAY Sustained winds 35 kt. Track it on the zombie radar or see NHC advisories.
🌪 TROPICAL ACTIVITY: HURRICANE ODALYS Sustained winds 75 kt. Track it on the zombie radar or see NHC advisories.
🌪 TROPICAL ACTIVITY: HURRICANE POLO Sustained winds 140 kt. Track it on the zombie radar or see NHC advisories.
⚡ TODAY'S SEVERE OUTLOOK: GENERAL THUNDERSTORMS RISK Thunderstorms possible. The horde does not mind getting wet.
Mostly cloudy night
60°

ddaarrkk cclouudds

  • Humidity: 85%
  • Visibility: 6.2 Mi
  • Wind: NNW at 6 MPH
  • Dew Point: 0° F
  • Cloud Cover: 100%
  • UV Index: 0 - Low
  • Air Quality: Good
  • Moon: Waxing Gibbous (94% full) · up 5:56pm, down 4:36am

☀ Solar Outbreak Watch: Quiet · largest flare C1.1 · Kp 3 The sun naps. The horde does not. full report →

Today's high of 74° F is colder than 62% of every September 23rd since 2005.

ThuFriSatSunMon

Zombie Survival Index™

55/100 — ELEVATED Locckk yourr doooorssss

  • Mild temps: standard shamble speed
  • Clear sightlines: you will see them coming
  • Darkness: their favorite

Today's undead advice: Count your group at dusk. Count again at dawn.

Rule #5 Silence is golden After dark, sound carries — and so does the smell of the living. all the Rules of Survival →

🌡 The weather here, in general

Boulder gets a real winter. February nights average 15°F, and July highs reach about 85°F — a 70-degree swing across the year. Cold that deep is its own hazard: exposed skin, car batteries and water pipes all have opinions about it.

The thermometer rarely spikes — only about 16 days a year top 90°F — but it hardly needs to. Summer sits in the mid-eighties for months at a stretch, and with humidity on top of it the heat index runs well above what the air temperature suggests.

Snow is a real feature of the year: roughly 57 inches falls in an average year, mostly across January, February, March, April, May, October, November and December. With 156 nights a year at or below freezing, ice on the roads is a longer season than snow on the ground.

Rainfall averages about 21 inches a year, wettest in May and driest in December.

MonthAvg highAvg lowRainSnow
Jan38°17° 1"6.8"
Feb39°15° 1.4"9.4"
Mar48°24° 2.1"10.8"
Apr57°31° 2.3"9.2"
May65°41° 4.6"4.3"
Jun80°54° 1.9"
Jul85°59° 1.5"
Aug83°58° 1.4"
Sep78°52° 1"0.9"
Oct63°38° 1.3"3.6"
Nov49°27° 1.3"7"
Dec42°21° 0.9"5.4"

Averages from ten years of observed daily records (2015–2024) for this location. They describe what is typical, not what will happen — for that, see the forecast above.

📷 Golden Hour

  • Golden hour: 6:26pm - 7:01pm (dawn: 6:43am - 7:19am)
  • Blue hour: 7:01pm - 7:28pm (dawn: 6:16am - 6:43am)
  • Sun sets: 271° W (rises 89° E)
  • Dark sky: 8:32pm – 5:12am · next new moon Oct 11 (17d)

Blocked Sunset odds 20/100 Low cloud is sitting on the horizon. The colour never reaches you.

Waxing Gibbous
94% · full Sep 26

Sun & moon: sunrisesunset.io · cloud layers: Open-Meteo · astro & Milky Way planner →

Weather Details

Fri

Partly cloudy night

High: 73° F
|
Low: 54° F
ddaarrkk cclouudds
Moderate confidence ±5.3°
Weather Details

Sat

Partly cloudy night

High: 78° F
|
Low: 48° F
ddaarrkk cclouudds
Moderate confidence ±3.1°
Weather Details

Sun

Partly cloudy night

High: 78° F
|
Low: 47° F
ddaarrkk cclouudds
Moderate confidence ±3.7°
Weather Details

Mon

Mostly cloudy night

High: 70° F
|
Low: 47° F
ddaarrkk cclouudds
High confidence ±2°
Weather Details


High: ° F
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Low: ° F
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High: ° F
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Will it rain on your plans?

Weather Details

Thu Sep 24 12am 60° F

Mostly cloudy night
ddaarrkk cclouudds

  • Cloud Cover: 100%
  • Dew Point: 0° F
  • Humidity: 85%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 1 MPH / WSW
Weather Details

Thu Sep 24 3am 61° F

Mostly cloudy night
ddaarrkk cclouudds

  • Cloud Cover: 100%
  • Dew Point: 0° F
  • Humidity: 80%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 2 MPH / WSW
Weather Details

Thu Sep 24 6am 62° F

Mostly cloudy night
ddaarrkk cclouudds

  • Cloud Cover: 100%
  • Dew Point: 0° F
  • Humidity: 74%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 2 MPH / W
Weather Details

Thu Sep 24 9am 67° F

Cloudy
CLLOOUUUDDSSS LLLOOOTTTSSS

  • Cloud Cover: 92%
  • Dew Point: 0° F
  • Humidity: 56%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 3 MPH / NNE
Weather Details

Thu Sep 24 12pm 74° F

Cloudy
CLLOOUUUDDSSS LLLOOOTTTSSS

  • Cloud Cover: 87%
  • Dew Point: 0° F
  • Humidity: 39%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 6 MPH / ENE
Weather Details

Thu Sep 24 3pm 74° F

Cloudy
CLLOOUUUDDSSS LLLOOOTTTSSS

  • Cloud Cover: 83%
  • Dew Point: 0° F
  • Humidity: 36%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 5 MPH / NE
Weather Details

Thu Sep 24 6pm 72° F

Cloudy
CLLOOUUUDDSSS LLLOOOTTTSSS

  • Cloud Cover: 60%
  • Dew Point: 0° F
  • Humidity: 40%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 3 MPH / NE
Weather Details

Thu Sep 24 9pm 67° F

Mostly cloudy night
ddaarrkk cclouudds

  • Cloud Cover: 52%
  • Dew Point: 0° F
  • Humidity: 52%
  • Precipitation: None
  • UV Index: 0 - Unknown
  • Visibility: 6.2 Mi
  • Wind: 1 MPH / NNW

7-Day Meteogram

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