Live precipitation radar. Open full-screen radar
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.
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.
🗺 National Outbreak Map | 🪛 Build your Survival Kit | 💀 Take the Survivor Quiz | 📖 Survival Guide | 📜 Rules of Survival | </> Embed this on your site
🌡 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.
| Month | Avg high | Avg low | Rain | Snow |
|---|---|---|---|---|
| Jan | 38° | 17° | 1" | 6.8" |
| Feb | 39° | 15° | 1.4" | 9.4" |
| Mar | 48° | 24° | 2.1" | 10.8" |
| Apr | 57° | 31° | 2.3" | 9.2" |
| May | 65° | 41° | 4.6" | 4.3" |
| Jun | 80° | 54° | 1.9" | — |
| Jul | 85° | 59° | 1.5" | — |
| Aug | 83° | 58° | 1.4" | — |
| Sep | 78° | 52° | 1" | 0.9" |
| Oct | 63° | 38° | 1.3" | 3.6" |
| Nov | 49° | 27° | 1.3" | 7" |
| Dec | 42° | 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.
94% · full Sep 26
Sun & moon: sunrisesunset.io · cloud layers: Open-Meteo · astro & Milky Way planner →
