San Bernardino weather in July
In July, San Bernardino has daytime highs averaging 33 °C, nights around 19 °C, with 2.3 wet days. Figures are 1991–2020 climate normals.
- 33.3°C Average high
- 19.4°C Average low
- 2.3days Wet days
- 10mm Rainfall
- 14h Daylight
Daily temperatures through July
How July develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 July | 32.8 °C | 18.8 °C | 7 % |
| 11–20 July | 33.3 °C | 19.5 °C | 8 % |
| 21–31 July | 33.6 °C | 19.9 °C | 7 % |
What to expect
| Measure | Typical July | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 99 % |
| Days above 30 °C | 26 of 31 | 83 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 2.3 of 31 | 8 % |
Conditions in July
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 46 °C |
| Record low (1991–2020) | 12 °C |
| Relative humidity | 50 % |
| Wind speed | 13 km/h |
| Cloud cover | 18 % |
Where San Bernardino ranks in July
| Ranking | Position | Value |
|---|---|---|
| The driest places in North America in July | 41stof 50 | 10 mm |
| The warmest places in North America in July | 49thof 50 | 33 °C |
July compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| May | 26.1 °C | 13 mm | 33 % |
| June | 30.1 °C | 4 mm | 19 % |
| July | 33.3 °C | 10 mm | 18 % |
| August | 34.2 °C | 8 mm | 14 % |
| September | 32.5 °C | 7 mm | 16 % |
See all twelve months for San Bernardino
- July is the 2nd warmest month here.
- It is the 4th driest month of the year.
- It ranks 3rd for least cloud cover.
- Days last about 14 hours from sunrise to sunset.
- It rains on 2.3 of 31 days — 8 % of the month.
- Nights are about 14 °C cooler than the middle of the day.
- The hottest July day on record since 1991 reached 46 °C, 13 °C above the usual daytime high.
Nearby destinations in July
| Destination | Avg high | Wet days |
|---|---|---|
| San Bernardino | 33 °C | 2.3 |
| Fontana | 33 °C | 1 |
| Moreno Valley | 32 °C | 2 |
| Riverside | 33 °C | 1 |
| Ontario | 32 °C | 0 |
| Corona | 32 °C | 1 |
| Pomona | 31 °C | 1 |
QuestionsJuly in San Bernardino, answered
How warm is San Bernardino in July?
Daily highs average 33 °C and nights fall to about 19 °C, a spread of 14 °C between afternoon and dawn. That makes July the 2nd warmest month of the year here.
Does it rain much in San Bernardino in July?
July averages 10 mm of rain, spread over about 2 of the 31 days — 8 % of the month. Cloud cover averages 18 % of the sky.
How long are the days in July?
San Bernardino averages 14 hours between sunrise and sunset in July. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.