Santa Ana, CA Weather
Santa Ana hourly forecast: next 24 hours
Today's high of 78°F (26°C) is about 6°F (3°C) below the typical September high of 84°F (29°C).
Current conditions in detail
Santa Ana weather tomorrow (Wednesday, September 16)
Tomorrow in Santa Ana looks sunny, with a high of 77° and an overnight low of 65°. Rain is unlikely (4% chance). Winds top out near 11 mph, and the UV index reaches 8 (very high).
Santa Ana 14-day forecast
About the weather in Santa Ana
Santa Ana runs on a dry-summer rhythm: the warmest months are also the driest. July averages 3 mm (0.1 in) while the wet season peaks in January at 2.8 inches (70 mm). Highs range from 66°F (19°C) to 85°F (29°C).
Santa Ana weather: quick facts
- Hottest month: August - highs near 85°F (29°C)
- Coldest month: January - highs near 66°F (19°C)
- Decade extremes (2015-2024): 113°F (45°C) high · 36°F (2°C) low
- Wettest month: January (5 rainy days) · Sunniest: July (13.3 h sun/day)
- Climate type: semi-arid
- Annual swing: 9°C between the average warmest and coolest month · day to night: 11°C
- Average humidity: 67%
Temperatures through the year
January is the wettest month at 2.8 inches (70 mm) over 5 days; July is the driest. At its warmest, in August, Santa Ana runs to 85°F (29°C) in the afternoon and back to 64°F (18°C) by dawn. January sits at the other end of the year: 66°F (19°C) by day, 48°F (9°C) at night. July is the brightest month at 13.3 hours of sun a day, against an annual average of 10.8 - sunnier than 91% of the 3496 cities in our dataset.
Rain, sun and snow
Between the average August and the average January lie 9°C, a narrower spread than about 77% of the cities we track. Relative humidity averages 67% across the year, drier than about 75% of the cities we track. 8 months average under 20 mm of rain, the longest unbroken stretch running April through November. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 113°F (45°C) and the lowest daily minimum 36°F (2°C).
Season by season
Spring (March through May)
Spring in Santa Ana is mild and warm, with daytime highs averaging 71°F (22°C) and nights around 53°F (12°C); rain comes on about 13 days over the three months. Daylight is generous - around 11.3 hours of sun a day.
Summer (June through August)
Through summer, Santa Ana sits firmly in the heat: 82°F (28°C) by day, 62°F (17°C) after dark, and precipitation is sparse, near 14 mm (0.5 in) for the season. Daylight is generous - around 12.9 hours of sun a day.
Fall (September through November)
Fall is pleasantly warm here - highs near 79°F (26°C), nights near 59°F (15°C), and precipitation is sparse, near 1.5 inches (38 mm) for the season. Daylight is generous - around 10.3 hours of sun a day.
Winter (December through February)
Winter stays on the cool side of mild here - highs near 67°F (19°C), nights near 48°F (9°C), and rain comes on about 15 days over the three months.
Average temperatures in Santa Ana by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 66° | 48° | 5 | 2.8 in | 8.4 h/day | 67% |
| February | 67° | 48° | 5 | 2.1 in | 9.1 h/day | 63% |
| March | 68° | 50° | 7 | 2.0 in | 10.4 h/day | 69% |
| April | 73° | 54° | 2 | 0.7 in | 11.4 h/day | 66% |
| May | 73° | 56° | 3 | 0.4 in | 12.0 h/day | 70% |
| June | 79° | 60° | 0 | 0.2 in | 13.0 h/day | 71% |
| July | 83° | 63° | 0 | 0.1 in | 13.3 h/day | 72% |
| August | 85° | 64° | 0 | 0.3 in | 12.3 h/day | 72% |
| September | 84° | 64° | 1 | 0.4 in | 11.3 h/day | 70% |
| October | 80° | 60° | 2 | 0.4 in | 10.2 h/day | 64% |
| November | 74° | 53° | 2 | 0.7 in | 9.5 h/day | 56% |
| December | 67° | 49° | 5 | 2.6 in | 8.2 h/day | 63% |