Rancho Cucamonga, CA Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Rancho Cucamonga, CA in one place.
Mostly sunny, with a high near 77. Southwest wind 5 to 15 mph, with gusts as high as 25 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: May 24, 2026 9:26 AM PDT.
The active forecast window currently covers May 25 to May 30, 2026 for Rancho Cucamonga, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 25 to May 30, 2026
- Latest sync
- May 24, 2026 9:26 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Rancho Cucamonga
Saturday looks like the warmest upcoming period in Rancho Cucamonga at 81 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 53 degrees F.
The strongest winds are forecast for Memorial Day at about 5 to 15 mph SW.
The forecast from May 25 through May 30 stays mostly dry.
Forecast Details
- Last updated
- May 24, 2026 9:26 AM PDT
- Coverage
- 7 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
Patchy drizzle after 11pm. Mostly cloudy, with a low around 55. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Patchy drizzle before 11am. Partly sunny, with a high near 72. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Mostly cloudy, with a low around 54.
Partly sunny, with a high near 70.
Partly cloudy, with a low around 53.
Mostly sunny, with a high near 69.
Mostly clear, with a low around 53.
Sunny, with a high near 75.
Mostly clear, with a low around 55.
Sunny, with a high near 81.
Clear, with a low around 58.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Memorial Day
May 25
|
Mostly Sunny
|
77°F |
5 to 15 mph
SW
|
|
Monday Night
May 25
|
Patchy Drizzle
|
55°F |
5 to 15 mph
SW
|
|
Tuesday
May 26
|
Patchy Drizzle then Partly Sunny
|
72°F |
5 to 15 mph
SW
|
|
Tuesday Night
May 26
|
Mostly Cloudy
|
54°F |
5 to 15 mph
SW
|
|
Wednesday
May 27
|
Partly Sunny
|
70°F |
5 to 15 mph
S
|
|
Wednesday Night
May 27
|
Partly Cloudy
|
53°F |
5 to 15 mph
SW
|
|
Thursday
May 28
|
Mostly Sunny
|
69°F |
5 to 10 mph
SW
|
|
Thursday Night
May 28
|
Mostly Clear
|
53°F |
0 to 10 mph
W
|
|
Friday
May 29
|
Sunny
|
75°F |
0 to 10 mph
SW
|
|
Friday Night
May 29
|
Mostly Clear
|
55°F |
0 to 10 mph
W
|
|
Saturday
May 30
|
Sunny
|
81°F |
0 to 10 mph
SW
|
|
Saturday Night
May 30
|
Clear
|
58°F |
0 to 10 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Rancho Cucamonga.
