Rancho Cucamonga, CA Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Rancho Cucamonga, CA in one place.
Sunny, with a high near 99. Southwest wind 0 to 10 mph, with gusts as high as 20 mph.
Local Weather Overview
This forecast page for Rancho Cucamonga, CA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 8, 2026 9:43 AM PDT.
The active forecast window currently covers Oct 8 to Oct 14, 2026 for Rancho Cucamonga, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 8 to Oct 14, 2026
- Latest sync
- Oct 8, 2026 9:43 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Rancho Cucamonga
Today looks like the warmest upcoming period in Rancho Cucamonga at 99 degrees F.
Monday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Sunday Night at about 10 to 20 mph SW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 8, 2026 9:43 AM PDT
- Coverage
- 8 days
- Time zone
- America/Los_Angeles
- Forecast office
- SGX
- Radar station
- KSOX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Clear, with a low around 69. Northwest wind 0 to 10 mph, with gusts as high as 20 mph.
Sunny, with a high near 93. West wind 0 to 15 mph, with gusts as high as 25 mph.
Patchy fog after 5am. Partly cloudy, with a low around 67. Southwest wind 0 to 10 mph, with gusts as high as 20 mph.
Patchy fog before 11am, then a slight chance of rain showers. Mostly cloudy, with a high near 82. Southwest wind 0 to 10 mph. Chance of precipitation is 20%.
Rain showers likely. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Rain showers likely. Mostly cloudy, with a high near 76.
Rain showers likely. Mostly cloudy, with a low around 56.
Rain showers likely. Mostly cloudy, with a high near 68.
A chance of rain showers. Mostly cloudy, with a low around 52.
A chance of rain showers. Partly sunny, with a high near 71.
A slight chance of rain showers. Partly cloudy, with a low around 52.
A slight chance of rain showers before 11am. Sunny, with a high near 75.
Mostly clear, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Oct 8
|
Sunny
|
99°F |
0 to 10 mph
SW
|
|
Tonight
Oct 8
|
Clear
|
69°F |
0 to 10 mph
NW
|
|
Friday
Oct 9
|
Sunny
|
93°F |
0 to 15 mph
W
|
|
Friday Night
Oct 9
|
Partly Cloudy then Patchy Fog
|
67°F |
0 to 10 mph
SW
|
|
Saturday
Oct 10
|
Patchy Fog then Slight Chance Rain Showers
|
82°F |
0 to 10 mph
SW
|
|
Saturday Night
Oct 10
|
Rain Showers Likely
|
64°F |
5 to 10 mph
S
|
|
Sunday
Oct 11
|
Rain Showers Likely
|
76°F |
5 to 15 mph
S
|
|
Sunday Night
Oct 11
|
Rain Showers Likely
|
56°F |
10 to 20 mph
SW
|
|
Columbus Day
Oct 12
|
Rain Showers Likely
|
68°F |
5 to 10 mph
SW
|
|
Monday Night
Oct 12
|
Chance Rain Showers
|
52°F |
0 to 5 mph
W
|
|
Tuesday
Oct 13
|
Chance Rain Showers
|
71°F |
0 to 5 mph
SW
|
|
Tuesday Night
Oct 13
|
Slight Chance Rain Showers
|
52°F |
0 to 5 mph
S
|
|
Wednesday
Oct 14
|
Slight Chance Rain Showers then Sunny
|
75°F |
0 to 5 mph
SE
|
|
Wednesday Night
Oct 14
|
Mostly Clear
|
55°F |
0 to 5 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Rancho Cucamonga.
