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Kurunegala

7.484° N   80.368° E  ·  146 M
51 /100
PEAK
Marginal, but there is a 1 hour gap from 04:30.
BEST WINDOW 04:30–05:30 · ASTRO DARK 23:30–05:30 · MOON 0%
Transparency
0.35
Seeing
0.77
Cloud
30%
Moon
0%

Fair tonight

Hour by hour, local to Kurunegala. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
23
00
01
02
03
04
05
06
23
26
9
19
12
51
4
0
BEST WINDOW
Low cloud
20%
11%
69%
40%
64%
14%
61%
85%
Mid cloud
26%
7%
3%
9%
14%
7%
3%
5%
High cloud
84%
98%
98%
88%
77%
13%
52%
63%
Transparency
0.35
0.32
0.30
0.30
0.31
0.32
0.27
0.27
Seeing
0.71
0.69
0.71
0.74
0.76
0.73
0.77
0.77
Moon clear
down
down
down
down
down
down
down
0%
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
23 Poor · 23/100
Starting from
100
Cloud
−67
Transparency
−9
Seeing
−2
Moonlight
−0
Darkness
−0
Score
23
CLOUD 90% LOW 20% MID 26% HIGH 84% SUN -65.1° MOON -63.6° / 0% WIND 5 TEMP 25°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 04:00 · OBSERVE 04:30–05:30 · 1H · MEAN 52

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

23010305
HIGH CLOUD CLEARS 04:30CLOUD RETURNS 05:30
SET UP 04:00 · OBSERVE 04:30–05:30 · 1H · MEAN 56

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

23010305
HIGH CLOUD CLEARS 04:30CLOUD RETURNS 05:30MOONLIGHT IGNORED FOR THIS TARGET
SET UP 04:00 · OBSERVE 04:30–05:30 · 1H · MEAN 48

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

23010305
HIGH CLOUD CLEARS 04:30CLOUD RETURNS 05:30
SET UP 04:00 · OBSERVE 04:30–05:30 · 1H · MEAN 37

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

23010305
HIGH CLOUD CLEARS 04:30CLOUD RETURNS 05:30
SET UP 04:00 · OBSERVE 04:30–05:30 · 1H · MEAN 54

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

23010305
HIGH CLOUD CLEARS 04:30CLOUD RETURNS 05:30
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The next week of nights

Tonight · 12 Aug
51
Fair
MOON 0%
04:30–05:30
Tomorrow · 13 Aug
41
Fair
MOON 2%
21:30–22:30
Friday · 14 Aug
17
Poor
MOON 6%
Saturday · 15 Aug
27
Poor
MOON 13%
Sunday · 16 Aug
28
Poor
MOON 21%
Monday · 17 Aug
21
Poor
MOON 30%
Tuesday · 18 Aug
0
Clouded out
MOON 39%
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Nearby locations

About this forecast

Conditions for Kurunegala, Sri Lanka are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →