Guyancourt Weather Today · 7-Day Forecast
Fog Lies Upon the Plain
Sight is poor. Travellers urged to go slow and light their lanterns.
Warmest Tuesday at 17° · coldest night tonight at 4°
The short of it: Guyancourt weather on Sunday, 8 November 2026: local time, 4 °C (40 °F) with fog, feeling like 3 °C (37 °F). Today’s high 10 °C (50 °F), low 4 °C (40 °F). No rain expected in the next 24 hours. Notices: fog advisory. Source: Open-Meteo forecast models, updated 05:00 local time.
GUYANCOURT, Sunday. — Guyancourt may look for fog this day, with the mercury climbing to about 10° before sinking to 4° by night. That is about what a November day usually brings here, where the long-run average high is 10°. Winds are light from the NE, gusting to 6 km/h, and the glass holds steady.
Looking over the next 3 days, our correspondent reckons Tuesday the pick at about 17°, while tonight will be the coldest at 4°. Rain or snow is due on 2 of them, some 11 mm in all. No frost is in sight.
By the Almanac's reckoning, November in Guyancourt runs from 5° at night to 10° by day, with some 59 mm of rain. August is the warmest month here at 25°, February the coldest at 2°, and December the wettest with 69 mm. The best months to ride in are June and July.
The sun is up 9 h 31 min today, and the days are shortening by about 3 minutes each. The station stands 151 m above the sea.
The Hours to Come
Temperature by the hour · rain & snow in the hour beneathThe hour-by-hour ledger
| Hour | Sky | Temp | Feels | Wind | Rain |
|---|---|---|---|---|---|
| Now | Fog | 4° | 3° | 1 km/h | – |
| 6 AM | Fog | 4° | 2° | 2 km/h | – |
| 7 AM | Fog | 4° | 2° | 3 km/h | – |
| 8 AM | Fog | 5° | 3° | 2 km/h | – |
| 9 AM | Fog | 5° | 3° | 3 km/h | – |
| 10 AM | Fog | 6° | 4° | 4 km/h | – |
| 11 AM | Mostly clear | 7° | 5° | 4 km/h | – |
| 12 PM | Mostly clear | 8° | 7° | 3 km/h | – |
| 1 PM | Mostly clear | 9° | 8° | 3 km/h | – |
| 2 PM | Mostly clear | 10° | 8° | 4 km/h | – |
| 3 PM | Mostly clear | 10° | 8° | 5 km/h | – |
| 4 PM | Mostly clear | 10° | 8° | 5 km/h | – |
| 5 PM | Mostly clear | 9° | 7° | 5 km/h | – |
| 6 PM | Mostly clear | 7° | 5° | 4 km/h | – |
| 7 PM | Mostly clear | 6° | 4° | 4 km/h | – |
| 8 PM | Overcast | 5° | 3° | 4 km/h | – |
| 9 PM | Overcast | 5° | 3° | 3 km/h | – |
| 10 PM | Overcast | 5° | 3° | 3 km/h | – |
| 11 PM | Overcast | 5° | 3° | 3 km/h | – |
| 12 AM | Overcast | 5° | 3° | 3 km/h | – |
| 1 AM | Overcast | 5° | 3° | 3 km/h | – |
| 2 AM | Overcast | 5° | 3° | 4 km/h | – |
| 3 AM | Overcast | 5° | 3° | 4 km/h | – |
| 4 AM | Overcast | 5° | 3° | 5 km/h | – |
Seven-Day Outlook · Classified
Highs in large type · pick a dayToday (Nov 8): fog, high 10°, low 4°, dry, gusts to 9 km/h. Sun up 7:49 AM, down 5:20 PM. Sight is poor. Travellers urged to go slow and light their lanterns.
Monday (Nov 9): light rain, high 9°, low 5°, 3.3 mm of rain, gusts to 13 km/h. Sun up 7:50 AM, down 5:19 PM. A gentle rain falls over the district. Keep under a roof if you can.
Tuesday (Nov 10): light showers, high 17°, low 9°, 8.1 mm of rain, gusts to 21 km/h. Sun up 7:52 AM, down 5:18 PM. Short showers cross the fields. The sun returns soon after.