11-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Overcast
9°
Feels like 7°
Wind↑ E 14 km/h
Gusts32 km/h
Humidity 73 %
Evening
Light rain
9°
Feels like 6°
Wind↑ ENE 15 km/h
Gusts33 km/h
Humidity 82 %
💧 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.
Morning
Rain
7°
Feels like 4°
Wind↑ N 17 km/h
Gusts27 km/h
Humidity 87 %
💧 6.8 mm
Evening
Rain showers
7°
Feels like 4°
Wind↑ N 17 km/h
Gusts41 km/h
Humidity 81 %
💧 0.6 mm
13-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Overcast
7°
Feels like 6°
Wind↑ NW 6 km/h
Humidity 88 %
Evening
Clear sky
8°
Feels like 7°
Wind↑ WNW 6 km/h
Humidity 78 %
14-day outlook — past day 10 this is an outlook from the end of the GFS run: expect differences of several degrees.
Morning
Overcast
6°
Feels like 6°
Wind↑ WNW 4 km/h
Humidity 86 %
Cergy 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)
Cergy climate: what a normal year looks like
From 16 h 12 min of daylight in late June to 8 h 13 min in late December.
There is no real dry season: monthly rainfall stays between 49 mm and 76 mm on average.
The hottest stretch is August, when afternoons average 24 °C; the coldest is January, when nights average 2 °C.
A normal year brings roughly 730 mm of rain — less than 70% of the towns of 20,000+ people we compared it with.
Forecast highs for the coming week average 12 °C, 3 °C cooler than a normal October (15 °C).
30-year averages (1991–2020)
Month
Typical high
Typical low
Rainfall
Jan
7 °C
2 °C
60 mm
Feb
8 °C
2 °C
54 mm
Mar
11 °C
4 °C
57 mm
Apr
15 °C
6 °C
56 mm
May
18 °C
9 °C
69 mm
Jun
21 °C
13 °C
62 mm
Jul
24 °C
14 °C
57 mm
Aug
24 °C
14 °C
63 mm
Sep
20 °C
11 °C
49 mm
Oct
15 °C
9 °C
67 mm
Nov
10 °C
5 °C
65 mm
Dec
7 °C
2 °C
76 mm
Whole year
15 °C
8 °C
730 mm
Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 49.04° N, 2.05° E, 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 Cergy: pollution and pollen
2/6
Fair
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.516µg/m³
PM1026µg/m³
O₃29µg/m³
NO₂15µg/m³
SO₂1µg/m³
Pollen
AlderNone
BirchNone
GrassNone
MugwortNone
OliveNone
RagweedNone
Copernicus CAMS model, updated several times a day.
Rain radar around Cergy
Rain observed over the last two hours by official weather radars around Cergy, 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
Moon over Cergy
Waning gibbous
87 % illuminated · 18.3 days
Rise 05:10 Set 23:08
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 (Europe/Paris); phase and lit fraction from a synodic calculation.
Look up a past day in Cergy
Curious about the weather in Cergy on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Cergy weather at a glance
This page gathers everything about the weather in Cergy, Val-d'Oise (95): 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 14 °C (feels like 14 °C) and the wind blows at 10 km/h.
Expected range today: 6 °C to 14 °C and a dry sky. 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 Cergy 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.
