Rancho Cucamonga, CA Weather & Climate Normals
Rancho Cucamonga's real weather, in one number
Rancho Cucamonga, CA scores 75/100 on this site's reading of NOAA's own 30-year normals: mild with real seasons. A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. 9 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Rancho Cucamonga's hottest and coldest months
Rancho Cucamonga's hottest month is Aug, averaging 80°F; its coldest is Dec, averaging 55°F, a 24.8°F swing across the year, a middling gap by national standards.
Rancho Cucamonga's weather across the year
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 68°F | 45°F | 2.57in |
| Feb | 68°F | 46°F | 3.07in |
| Mar | 72°F | 49°F | 1.64in |
| Apr | 76°F | 51°F | 0.76in |
| May | 80°F | 56°F | 0.3in |
| Jun | 86°F | 60°F | 0.02in |
| Jul | 94°F | 65°F | 0.05in |
| Aug | 95°F | 65°F | 0.03in |
| Sep | 91°F | 64°F | 0.1in |
| Oct | 83°F | 57°F | 0.41in |
| Nov | 75°F | 49°F | 0.8in |
| Dec | 67°F | 44°F | 1.89in |
most of the year (9 of 12 months) are the best time to see Rancho Cucamonga at its mildest; the rest of the year, plan around Aug's heat.
Rain and snow in Rancho Cucamonga
Over a typical year, Rancho Cucamonga sees about 11.64in of precipitation a year across roughly 36 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Rancho Cucamonga ranks
Rancho Cucamonga ranks 214 of 4876 US cities in this dataset for comfort score, and 214 of 429 within CA. About 176,675 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Ontario Intl Ap, CA US, 5.5 miles from Rancho Cucamonga, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is