Quick answer: The moon is 67 % illuminated tonight (waxing gibbous) as seen from Boulder. Illumination is identical worldwide; what differs locally is moonrise timing, altitude in Boulder's sky and cloud cover.
Conditions on this page are recalculated from the latest forecast every time it is opened, for the current date in the location's own time zone. Showing .
This page answers a simple question for skywatchers in Boulder, USA: will the moon be visible tonight? We combine the current moon phase and illumination (which is the same everywhere on Earth) with Boulder's local moonrise and moonset times and tonight's cloud-cover forecast to give a clear visibility verdict. You'll see when the moon rises, when it sets, how high it climbs in Boulder's sky, what phase it's in, and whether clouds are likely to block the view. The page also shows the next 7 nights so you can plan for a full moon, supermoon, crescent or eclipse viewing from Boulder. All times are in the local Boulder timezone — no manual conversions required. Pair this with our moon photography page for the same city if you're planning to capture the moon with a camera.
Tonight the moon is a waxing gibbous at about 67 % illumination. From Boulder at 40.0° N, the practical questions are when it clears the horizon, how high it climbs, and whether cloud cover intervenes — the live panel above answers all three in local time.
Daylight, midday sun angle and golden-hour length below are calculated for Boulder's own coordinates (40.02° N, 105.27° W) on the 15th of each month.
| Month | Daylight | Sun at solar noon | Golden hour |
|---|---|---|---|
| January | 9 h 36 min | 29° | 60 min |
| February | 10 h 36 min | 37° | 55 min |
| March | 11 h 48 min | 47° | 52 min |
| April | 13 h 12 min | 59° | 53 min |
| May | 14 h 24 min | 69° | 57 min |
| June | 15 h 0 min | 73° | 61 min |
| July | 14 h 42 min | 72° | 59 min |
| August | 13 h 42 min | 64° | 55 min |
| September | 12 h 24 min | 52° | 52 min |
| October | 11 h 6 min | 40° | 54 min |
| November | 9 h 54 min | 31° | 58 min |
| December | 9 h 18 min | 27° | 62 min |
Scores are capped by dealbreakers — heavy rain, dangerous wind, thick fog or hazardous UV pull a day down no matter how pleasant the rest of the numbers look. Forecast data is Open-Meteo; solar and lunar values are computed for Boulder's own coordinates and time zone. Full details on the methodology page.