Rochester, CA
Unincorporated community in San Bernardino County, California
Rochester is a small unincorporated community in San Bernardino County, California. It is 2.9 miles NW of Rancho Cucamonga, the nearest town. Its ZIP code is 91730.
Rochester at a glance
- State
- California
- County
- San Bernardino County
- ZIP code
- 91730
- Nearest town
- Rancho Cucamonga (2.9 mi)
- Time zone
- America/Los Angeles
- Coordinates
- 34.0917, -117.5467
Weather in Rochester now
Loading the National Weather Service forecast…
Rochester weather by the hour
Rochester weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Rochester.
This week in Rochester
Sunrise, sunset and moon in Rochester
What is the weather usually like in Rochester?
Köppen climate classification, calculated from the 1991–2020 normals
- Augustwarmest month · 95°F average high
- Decembercoldest month · 44°F average low
- 11.6 inprecipitation per year · 296 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Rochester: April–May and October–November, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station ONTARIO INTL AP, CA US (USW00003102), adjusted for the elevation of Rochester.
Rochester weather month by month
Sunrise and sunset in Rochester through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 6:54 AM | 5:05 PM | 10 h 11 min |
| February | 6:33 AM | 5:35 PM | 11 h 2 min |
| March | 6:58 AM | 6:59 PM | 12 h 0 min |
| April | 6:17 AM | 7:22 PM | 13 h 5 min |
| May | 5:46 AM | 7:46 PM | 13 h 59 min |
| June | 5:36 AM | 8:04 PM | 14 h 27 min |
| July | 5:48 AM | 8:03 PM | 14 h 15 min |
| August | 6:10 AM | 7:38 PM | 13 h 27 min |
| September | 6:32 AM | 6:58 PM | 12 h 25 min |
| October | 6:54 AM | 6:17 PM | 11 h 22 min |
| November | 6:21 AM | 4:47 PM | 10 h 25 min |
| December | 6:47 AM | 4:43 PM | 9 h 56 min |
Times for the 15th of each month, local time (America/Los Angeles).
What is the weather like in Rochester?
Rochester has a hot semi-arid climate. The warmest month is August, with an average high of 95°F (35°C), and the coldest is December, with average lows of 44°F (6°C).
It gets about 11.6 inches (296 mm) of precipitation a year. The wettest month is February and the driest is June.
The best time to visit Rochester is April–May and October–November. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
Webcams near Rochester
The closest live webcam is I-15 · Arrow Route, 0.2 miles E of Rochester.
Webcams: Windy.com · Traffic cameras: Caltrans. Distances in a straight line from Rochester.
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Map of Rochester, CA
Tap any road on the map to see it in Street View below. Map: © OpenStreetMap contributors.
Rochester Street View
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Open in Google Maps ›Towns near Rochester
Other communities near Rochester
Questions about Rochester
Where is Rochester, CA?
Rochester is an unincorporated community in San Bernardino County, California, 2.9 miles NW of Rancho Cucamonga.
What county is Rochester in?
Rochester is in San Bernardino County, California.
What is the ZIP code of Rochester, CA?
The ZIP code for Rochester is 91730.
What is the nearest town to Rochester?
Rancho Cucamonga, 2.9 miles away.
Are there webcams near Rochester?
Yes. The closest is I-15 · Arrow Route, 0.2 miles away.
What is the hottest month in Rochester?
August, with an average high of 95°F (35°C).
What is the coldest month in Rochester?
December, with an average low of 44°F (6°C).
How much does it rain in Rochester?
About 11.6 inches (296 mm) a year; the wettest month is February.
Does it snow in Rochester?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Rochester?
April–May and October–November, when temperatures are most pleasant and rainy days are fewer.
What climate does Rochester have?
Hot semi-arid (Köppen BSh).
Last updated: