Is Tonight Good for Stargazing?
A simple go/no-go for naked-eye nights: score the sky, then dig into the forecast before you drive.
Open Tonight Observing Score · Open Stargazing Weather
What “good tonight” actually means
A usable night is not “perfectly clear forever.” It is a stretch of hours with low cloud, acceptable humidity or dew risk, and enough astronomical dark that stars (and maybe the Milky Way) are worth standing outside for. Planets and bright satellites can still work under a brighter Moon; faint structure cannot.
How the Tonight score works (0–100)
Tonight Observing Score compresses cloud, dew/humidity risk, transparency, and dark-sky timing into one number and a plain label:
- Go — conditions look solid for a session. Pack and go, then re-check close to departure.
- Maybe — a usable window is possible, but timing or moisture may limit you. Read the drivers and the hourly outlook.
- Skip — cloud, dew, or lack of dark time make a dedicated trip a poor bet. Stay home or pick another night.
Treat 0–100 as relative guidance for your pin, not a lab measurement. Two sites a short drive apart can score differently when coastal showers or haze sit on one side of town.
FAQ: Is tonight clear enough?
Cloud is low but the score says Maybe — why? Dew risk, poor transparency, or a short dark window can hold the label down even when the sky looks “clear” on a casual forecast.
Can I still see planets on a Skip night? Sometimes. Bright planets and the Moon punch through haze and partial cloud. Skip usually means “do not drive far for faint stars,” not “the sky is empty.”
Does a full Moon ruin everything? It washes out the Milky Way and faint Milky Way dust. It does not cancel Moon-aware targets, bright constellations, or many ISS passes. Pair the score with Sun/Moon Dark Window.
City light vs weather — which matters more tonight? Weather decides whether you see anything. Light pollution decides how deep you see. Score first for go/no-go; then improve the site with Dark Sky Finder when the forecast cooperates.
When Guyana (and other humid tropics) prove the rule
Near the equator and on humid coasts, afternoon convection and overnight dew can flip a “clear” evening into a fogged lens or a sudden shower line. Georgetown and the coast often clear after rain while an inland pin stays socked in — or the reverse. Set the score to the place you will stand, not only your home address, and open Stargazing Weather for the hourly detail behind the label.
Step-by-step decision
- Open Tonight Observing Score and set location.
- Read Go / Maybe / Skip and the 0–100 score.
- If Maybe or Go, open Stargazing Weather for cloud and humidity by hour.
- Confirm Moon and twilight with Dark Sky Window.
- If the sky is usable but washed out by city glow, pick a darker pin with Dark Sky Finder.
Common mistakes
- Trusting a national headline (“clear”) instead of the site pin and Tonight score.
- Driving on a Go night into a bright Moon without checking Dark Window.
- Using home-city weather while observing from a darker inland site.
Next
- How-to: How to Use Tonight Observing Score
- Topic: Time-of-Day Observing Guide
- Related: Observational Astronomy
- Tools: Tonight Score, Stargazing Weather, Dark Sky Window