Rancho Santa Margarita weather by month
What a typical year looks like in Rancho Santa Margarita, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at ELSINORE, 24 km from Rancho Santa Margarita; records cover 1897–2026.
The year at a glance
- Precipitation a year
- 11.7 in296 mm
- Snow a year
- 0.2 in0.5 cm
- Last spring freeze
- Feb 14
- First fall freeze
- Dec 5
- Heating degree days
- 1,610
- Cooling degree days
- 1,987
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 30°−1° (heating, 99%) and 108°42° (cooling, 1%).
Month by month
Rancho Santa Margarita in January
Highs average 66°19° and lows 42°5°, with 3 in75 mm of precipitation in a typical January.
- Record high
- 91°33° (1996)
- Record low
- 15°−9° (1963)
- Heating degree days
- 349
- Cooling degree days
- 2
Rancho Santa Margarita in February
Highs average 67°19° and lows 43°6°, with 2.9 in72 mm of precipitation in a typical February.
- Record high
- 95°35° (1900)
- Record low
- 19°−7° (1965)
- Heating degree days
- 286
- Cooling degree days
- 3
Rancho Santa Margarita in March
Highs average 72°22° and lows 46°8°, with 1.5 in38 mm of precipitation in a typical March.
- Record high
- 103°39° (1899)
- Record low
- 24°−4° (1898)
- Heating degree days
- 208
- Cooling degree days
- 12
Rancho Santa Margarita in April
Highs average 77°25° and lows 49°9°, with 0.54 in14 mm of precipitation and 0.2 in0.5 cm of snow in a typical April.
- Record high
- 109°43° (1898)
- Record low
- 24°−4° (1955)
- Heating degree days
- 115
- Cooling degree days
- 43
Rancho Santa Margarita in May
Highs average 82°28° and lows 54°12°, with 0.21 in5.3 mm of precipitation in a typical May.
- Record high
- 109°43° (1910)
- Record low
- 31°−1° (1899)
- Heating degree days
- 42
- Cooling degree days
- 132
Rancho Santa Margarita in June
Highs average 90°32° and lows 58°15°, with 0.07 in1.8 mm of precipitation in a typical June.
- Record high
- 114°46° (1917)
- Record low
- 35°2° (1908)
- Heating degree days
- 4
- Cooling degree days
- 282
Rancho Santa Margarita in July
Highs average 97°36° and lows 64°18°, with 0.18 in4.6 mm of precipitation in a typical July.
- Record high
- 117°47° (1934)
- Record low
- 41°5° (1962)
- Heating degree days
- 0
- Cooling degree days
- 474
Rancho Santa Margarita in August
Highs average 98°37° and lows 65°18°, with 0.06 in1.5 mm of precipitation in a typical August.
- Record high
- 118°48° (1933)
- Record low
- 40°4° (1962)
- Heating degree days
- 0
- Cooling degree days
- 505
Rancho Santa Margarita in September
Highs average 93°34° and lows 61°16°, with 0.17 in4.3 mm of precipitation in a typical September.
- Record high
- 117°47° (2020)
- Record low
- 35°2° (1964)
- Heating degree days
- 2
- Cooling degree days
- 367
Rancho Santa Margarita in OctoberThis month
Highs average 83°28° and lows 54°12°, with 0.51 in13 mm of precipitation in a typical October.
- Record high
- 110°43° (1950)
- Record low
- 25°−4° (1971)
- Heating degree days
- 35
- Cooling degree days
- 143
Rancho Santa Margarita in November
Highs average 73°23° and lows 46°8°, with 0.59 in15 mm of precipitation in a typical November.
- Record high
- 98°37° (1918)
- Record low
- 20°−7° (1931)
- Heating degree days
- 186
- Cooling degree days
- 23
Rancho Santa Margarita in December
Highs average 65°18° and lows 40°5°, with 2 in51 mm of precipitation in a typical December.
- Record high
- 90°32° (1901)
- Record low
- 17°−8° (1911)
- Heating degree days
- 383
- Cooling degree days
- 1