Will it be clear for stargazing in Rio de Janeiro tonight?

Overcast all night; the Moon (55% lit) rises at 00:16. That is the hourly total-cloud forecast for Rio de Janeiro, Brazil on the night of 2 October 2026, read inside the darkest hours: under 25% cloud counts as clear and 65% or more as cloudy. Rain or showers possible from about 19:00.

When does it get dark in Rio de Janeiro tonight?

In Rio de Janeiro, Brazil on the night of 2 October 2026, astronomical darkness begins at 19:07 and lasts until 04:15 GMT-3 — 9 h 9 min of fully dark sky. The Sun sets at 17:52, and nautical twilight ends at 18:40.

Is the Moon up tonight in Rio de Janeiro?

On the night of 2 October 2026 in Rio de Janeiro, Brazil, the Moon is a waning gibbous, 55% illuminated. It rises at 00:16 and sets at 11:01, GMT-3. 5 h 10 min of the dark window is moon-free.

Which planets can I see from Rio de Janeiro tonight?

From Rio de Janeiro, Brazil on the night of 2 October 2026: Venus (19:07–19:07, highest 11° in the W at 19:07, magnitude -4.7); Mars (02:57–04:15, highest 26° in the NE at 04:15, magnitude 1.1); Jupiter (03:47–04:15, highest 16° in the NE at 04:15, magnitude -1.9); Saturn (19:07–04:15, highest 65° in the N at 23:47, magnitude 0.2). Times are GMT-3; all are visible to the naked eye.

Stargazing forecast

Stargazing forecast for Rio de Janeiro, Brazil

Fri 2 Oct night
22.906° S, 43.182° W
12 m
GMT-3 · America/Sao_Paulo

Open the live forecast — sky score, seeing, 7 nights

Tonight at a glance

Overcast all night; the Moon (55% lit) rises at 00:16.

Rain or showers possible from about 19:00.
Dew risk: the temperature comes within 2 °C (3.6 °F) of the dew point by 19:00 — optics may fog without a dew heater.

Updated 16:01 GMT-3 (2 Oct, 19:01 UTC) · MET Norway forecast issued 2 Oct, 17:18 UTC

Cloud cover: 100%Cloudy
Dark hours: 9 h 9 min19:07–04:15
Moon: 55%5 h 10 min moon-free
Wind: 21 km/hBreezy
Low temperature: 20°CDuring the dark hours
Dew risk: HighAir comes within 1° of the dew point

Photo: Milky Way over Paranal — ESO/A. Ghizzi Panizza (www.albertoghizzipanizza.com), CC BY 4.0

Hourly forecast

Cloud by layer, hour by hour. Darker blue means clearer sky; each cell shows its percentage. Low cloud blocks the sky outright; thin high cloud only dims it.

Hourly cloud cover (%) and conditions tonight in Rio de Janeiro
GMT-3	Fri 2									Sat 3																								Sun 4
Hour	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06
Sky: Daylight 15–18, Nautical twilight 18–19, Dark 19–04, Astronomical twilight 04–05, Daylight 05–18, Nautical twilight 18–19, Dark 19–04, Astronomical twilight 04–05, Daylight 05–07
Total cloud	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	97	80	95	91	96	100	96	70	95
Low cloud	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	59	60	38	9	95	99	98	90	98	56	61	66	23	24	27	16	7	6	2	1	1	2	12	10	15
Mid cloud	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	90	100	100	75	100	56	69	63	84	80	87	100	64	22	91
High cloud	84	98	100	100	100	100	100	100	100	98	89	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	99	57	100	81	46	70	57	68	89	90	57	48
Sun & Moon
Temperature °C	22	21	21	21	21	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	20	20	20	20	20
Dew point °C; dew risk (within 2° of the dew point): 15, 16, 17, 18, 19, 20, 21, 22, 23, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 00, 01, 02, 03, 04, 05, 06	20	20	20	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	20	20	20	20	20	20	20	20	19	19	19	19	19	19	19	19	19
Wind km/h	27	27	28	24	23	24	24	21	21	19	19	18	20	16	17	16	16	18	19	20	21	19	20	24	25	23	24	24	26	27	28	23	22	23	21	13	10	12	13	13
Rain (mm)	0.9	0.8	0.9	1.4	1.6	2.6	2.7	2.4	1.8	1.4	1.8	2.0	2.5	3.2	3.6	4.0	3.2	3.4	2.4	1.3	1.4	1.1	1.5	1.7	1.7	0.9	0.3	0.4	0.4	0	0	0	0	0	0	0.6	1.8	0.3	0	0

Cloud cover0–9%10–24%25–44%45–64%65–84%85–100%

SkyDaylightCivil twilightNautical twilightAstronomical twilightDark

Sun altitudeMoon altitude12dew risk (within 2° of the dew point)Scroll sideways for the next 40 hours →

Weather data: MET Norway (CC BY 4.0)

Next 7 nights

Average cloud during each night's dark hours, with the Moon. The first two to three nights use hourly data; later nights use MET Norway's 6-hourly steps and are less certain.

Tonight2 Oct
100%Cloudy
55% · 5 h 10 min moon-free
19:07–04:15
Sat3 Oct
95%Cloudy
44% · 6 h 10 min moon-free
19:07–04:14
Sun4 Oct
66%Cloudy
33% · 6 h 50 min moon-free
19:08–04:13
6-hourly data
Mon5 Oct
89%Cloudy
23% · 7 h 40 min moon-free
19:08–04:12
6-hourly data
Tue6 Oct
100%Cloudy
14% · 8 h 20 min moon-free
19:09–04:11
6-hourly data
Wed7 Oct
92%Cloudy
7% · 8 h 50 min moon-free
19:09–04:10
6-hourly data
Thu8 Oct
27%Partly cloudy
3% · 8 h 59 min moon-free
19:10–04:09
6-hourly data

Sun & twilight

Twilight ends in three steps. Faint galaxies and the Milky Way need astronomical darkness, when the Sun is more than 18° below the horizon.

Sunset: 17:52
Civil dusk (−6°): 18:14
Nautical dusk (−12°): 18:40
Astronomical dusk (−18°): 19:07
Astronomical dawn (−18°): 04:15
Nautical dawn (−12°): 04:42
Civil dawn (−6°): 05:08
Sunrise: 05:31

Dark window: 19:07 – 04:15 GMT-3 (9 h 9 min)

The Moon

Waning Gibbous

Illuminated: 55%
Age: 21.3 days
Moonrise: 00:16
Moonset: 11:01
Moon-free dark time: 5 h 10 min

Next phases

Last QuarterSat 3 Oct10:25
New MoonSat 10 Oct12:50
First QuarterSun 18 Oct13:13
Full MoonMon 26 Oct01:12

Next lunar eclipse visible here: Partial · Wed 12 Jan 2028, 01:13 · Moon 40° up
Next solar eclipse visible here: Partial · Sat 6 Feb 2027, 13:29 · 84% of the Sun covered

Planets tonight

Naked-eye planets that climb more than 10° above the horizon during the astronomically dark hours.

Altitude through the night

Planets tonight — Rio de Janeiro
Planet	Rises	Transits (altitude)	Sets	Best seen tonight	Brightness	In
VenusVisible	06:38	13:21 · 88°	20:00	19:07–19:07, W	mag -4.7	Virgo
JupiterVisible	02:59	08:34 · 52°	14:12	03:47–04:15, NE	mag -1.9	Leo
SaturnVisible	17:53	23:51 · 65°	05:49	19:07–04:15, N	mag 0.2	Cetus
MarsVisible	02:00	07:26 · 47°	12:54	02:57–04:15, NE	mag 1.1	Cancer
Mercury	06:39	13:07 · 81°	19:34	Below 10°	mag -0.1	Virgo

Lower magnitude = brighter. Venus and Jupiter outshine every star.

Sky events — next 90 days

Moon phases, seasons, planet highlights and eclipses, with times for this city.

Oct4Sun
Planet · 09:12
Saturn at opposition
Saturn is opposite the Sun: up all night, and at its closest and brightest for the year.
Oct10Sat
Moon · 12:50
New Moon
Darkest skies of the month for galaxies and the Milky Way.
Oct12Mon
Planet · 07:06
Mercury at greatest evening elongation
25° from the Sun — the best evening view of Mercury, low in the west after sunset.
Oct26Mon
Moon · 01:12
Full Moon
Bright moonlight all night; best for the Moon itself.
Oct28Wed
Moon · 15:04
Moon at perigee near full (a “supermoon”)
Closest to Earth this month: 364,397 km.
Nov9Mon
Moon · 04:02
New Moon
Darkest skies of the month for galaxies and the Milky Way.
Nov24Tue
Moon · 11:54
Full Moon
Bright moonlight all night; best for the Moon itself.
Nov25Wed
Moon · 18:02
Moon at perigee near full (a “supermoon”)
Closest to Earth this month: 359,335 km.
Dec8Tue
Moon · 21:52
New Moon
Darkest skies of the month for galaxies and the Milky Way.
Dec21Mon
Season · 17:50
Summer solstice
The shortest night of the year — the fewest dark hours.
Dec23Wed
Moon · 22:28
Full Moon
Bright moonlight all night; best for the Moon itself.
Dec24Thu
Moon · 05:32
Moon at perigee near full (a “supermoon”)
Closest to Earth this month: 356,641 km.

Quick answers

Will it be clear for stargazing in Rio de Janeiro tonight?: Overcast all night; the Moon (55% lit) rises at 00:16. That is the hourly total-cloud forecast for Rio de Janeiro, Brazil on the night of 2 October 2026, read inside the darkest hours: under 25% cloud counts as clear and 65% or more as cloudy. Rain or showers possible from about 19:00.
When does it get dark in Rio de Janeiro tonight?: In Rio de Janeiro, Brazil on the night of 2 October 2026, astronomical darkness begins at 19:07 and lasts until 04:15 GMT-3 — 9 h 9 min of fully dark sky. The Sun sets at 17:52, and nautical twilight ends at 18:40.
Is the Moon up tonight in Rio de Janeiro?: On the night of 2 October 2026 in Rio de Janeiro, Brazil, the Moon is a waning gibbous, 55% illuminated. It rises at 00:16 and sets at 11:01, GMT-3. 5 h 10 min of the dark window is moon-free.
Which planets can I see from Rio de Janeiro tonight?: From Rio de Janeiro, Brazil on the night of 2 October 2026: Venus (19:07–19:07, highest 11° in the W at 19:07, magnitude -4.7); Mars (02:57–04:15, highest 26° in the NE at 04:15, magnitude 1.1); Jupiter (03:47–04:15, highest 16° in the NE at 04:15, magnitude -1.9); Saturn (19:07–04:15, highest 65° in the N at 23:47, magnitude 0.2). Times are GMT-3; all are visible to the naked eye.

Forecast details

Location: 22.906° S, 43.182° W
Elevation: 12 m
Time zone: America/Sao_Paulo (GMT-3)
Weather model: MET Norway Locationforecast 2.0
Forecast issued: 2 Oct, 17:18 UTC
Next update expected: ≈ 2 Oct, 18:47 UTC
Page generated: 2 Oct, 19:01 UTC
Astronomy: Computed with astronomy-engine for these coordinates

Computed for 22.906° S, 43.182° W, elevation 12 m, time zone America/Sao_Paulo. City centres are light-polluted; the times here apply anywhere within about 50 km, so drive out to darker skies.

Sun, Moon and planet positions are calculated with astronomy-engine. Twilight uses the Sun's geometric centre; sunrise and sunset use the upper limb with standard refraction.

The summary line restates the hourly total-cloud forecast inside the dark window (clear under 25%, cloudy from 65%) and the Moon's times. It is not a score — the Tonight score lives in the app.

Seeing and transparency forecasts are coming to the app first (North America via Environment Canada's model, a worldwide beta elsewhere).

Nearby city forecasts

All forecasts in Brazil Moon phase calendar Telescope FOV calculator

Get tonight's score on your phone

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