11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Light rain
22°
Feels like 29°
Wind↑ S 17 km/h
Gusts26 km/h
Humidity 86 %
💧 2.5 mm
Afternoon
Light rain
21°
Feels like 26°
Wind↑ SSW 16 km/h
Gusts23 km/h
Humidity 85 %
💧 1.2 mm
12-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Light rain
21°
Feels like 27°
Wind↑ S 17 km/h
Gusts26 km/h
Humidity 81 %
💧 3.8 mm
Afternoon
Rain
21°
Feels like 27°
Wind↑ SSW 15 km/h
Gusts25 km/h
Humidity 88 %
💧 5.4 mm
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Light rain
20°
Feels like 26°
Wind↑ SSW 24 km/h
Gusts37 km/h
Humidity 82 %
💧 2.4 mm
Afternoon
Rain showers
24°
Feels like 27°
Wind↑ S 28 km/h
Gusts34 km/h
Humidity 58 %
💧 0.2 mm
14-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Night
Rain showers
20°
Feels like 20°
Wind↑ SW 13 km/h
Humidity 77 %
💧 0.2 mm
Serra forecast in charts · next 7 days
The week ahead: highs and lows
≈ A week close to the usual temperatures
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Serra climate: what a normal year looks like
The hottest stretch is February, when afternoons average 30 °C; the coldest is August, when nights average 18 °C.
Typical highs of 30 °C or more are reached in February only, at 30 °C.
A normal year brings roughly 1,270 mm of rain — more than 66% of the towns of 20,000+ people we compared it with.
The coming week looks normal for October: forecast highs average 27 °C, against a usual 27 °C.
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
30 °C
22 °C
145 mm
Feb
30 °C
23 °C
100 mm
Mar
30 °C
22 °C
157 mm
Apr
28 °C
21 °C
106 mm
May
27 °C
20 °C
60 mm
Jun
26 °C
18 °C
37 mm
Jul
25 °C
18 °C
43 mm
Aug
25 °C
18 °C
44 mm
Sep
26 °C
19 °C
59 mm
Oct
27 °C
20 °C
110 mm
Nov
28 °C
21 °C
208 mm
Dec
29 °C
22 °C
202 mm
Whole year
28 °C
20 °C
1,270 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 20.13° S, 40.31° W, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.
Air you breathe in Serra: pollution and pollen
2/6
Fair
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.511µg/m³
PM1015µg/m³
Copernicus CAMS model, updated several times a day.
Rain radar around Serra
Rain observed over the last two hours by official weather radars around Serra, followed by the radar forecast for the next hour where the weather service provides one.
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Rain radarLast two hours, then forecast where available · drag the timeline
No open weather radar covers Serra yet: the map shows our hour-by-hour rain forecast (ICON, GFS).
Moon over Serra
Waning gibbous
87 % illuminated · 18.3 days
Rise 15:34 Set 01:37
Fri30/1079%
Sat31/1069%
Sun1/1159%
Mon2/1149%Last quarter
Tue3/1138%
Wed4/1128%
Thu5/1119%
Fri6/1112%
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Moonrise and moonset in local time (America/Sao_Paulo); phase and lit fraction from a synodic calculation.
Look up a past day in Serra
Curious about the weather in Serra on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Serra weather at a glance
This page gathers everything about the weather in Serra, Rio de Janeiro: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “mainly clear”, it is 24 °C (feels like 31 °C) and the wind blows at 11 km/h.
Expected range today: 22 °C to 25 °C and a dry sky; keep an eye on thunderstorms. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.
Use the Serra forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.
