Bonsall weather by month
What a typical year looks like in Bonsall, California: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Escondido No. 2, 20 km from Bonsall; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 14.5 in369 mm
- Snow a year
- Rare
- Last spring freeze
- Jan 24
- First fall freeze
- Dec 7
- Heating degree days
- 1,214
- Cooling degree days
- 1,517
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 34°1° (heating, 99%) and 101°38° (cooling, 1%).
Month by month
Bonsall in January
Highs average 69°20° and lows 45°7°, with 3.2 in81 mm of precipitation in a typical January.
- Record high
- 92°33° (2003)
- Record low
- 13°−11° (1901)
- Heating degree days
- 256
- Cooling degree days
- 2
Bonsall in February
Highs average 69°20° and lows 46°8°, with 3.6 in91 mm of precipitation in a typical February.
- Record high
- 96°36° (2026)
- Record low
- 20°−7° (1899)
- Heating degree days
- 221
- Cooling degree days
- 5
Bonsall in March
Highs average 71°22° and lows 49°9°, with 2.2 in56 mm of precipitation in a typical March.
- Record high
- 101°38° (2026)
- Record low
- 20°−7° (1898)
- Heating degree days
- 169
- Cooling degree days
- 12
Bonsall in April
Highs average 74°23° and lows 52°11°, with 0.99 in25 mm of precipitation in a typical April.
- Record high
- 103°39° (1898)
- Record low
- 24°−4° (1906)
- Heating degree days
- 94
- Cooling degree days
- 34
Bonsall in May
Highs average 77°25° and lows 56°14°, with 0.35 in8.9 mm of precipitation in a typical May.
- Record high
- 106°41° (1896)
- Record low
- 30°−1° (1899)
- Heating degree days
- 40
- Cooling degree days
- 88
Bonsall in June
Highs average 82°28° and lows 60°16°, with 0.09 in2.3 mm of precipitation in a typical June.
- Record high
- 109°43° (1896)
- Record low
- 35°2° (1904)
- Heating degree days
- 5
- Cooling degree days
- 186
Bonsall in July
Highs average 87°31° and lows 64°18°, with 0.12 in3 mm of precipitation in a typical July.
- Record high
- 112°44° (2006)
- Record low
- 38°3° (1903)
- Heating degree days
- 0
- Cooling degree days
- 335
Bonsall in August
Highs average 89°32° and lows 65°19°, with 0.06 in1.5 mm of precipitation in a typical August.
- Record high
- 113°45° (1894)
- Record low
- 36°2° (2006)
- Heating degree days
- 0
- Cooling degree days
- 377
Bonsall in September
Highs average 87°31° and lows 63°17°, with 0.16 in4.1 mm of precipitation in a typical September.
- Record high
- 115°46° (2020)
- Record low
- 32°0° (1900)
- Heating degree days
- 1
- Cooling degree days
- 301
Bonsall in OctoberThis month
Highs average 81°27° and lows 57°14°, with 0.57 in14 mm of precipitation in a typical October.
- Record high
- 106°41° (2020)
- Record low
- 25°−4° (1900)
- Heating degree days
- 19
- Cooling degree days
- 144
Bonsall in November
Highs average 75°24° and lows 49°10°, with 1.1 in27 mm of precipitation in a typical November.
- Record high
- 100°38° (1909)
- Record low
- 20°−7° (1906)
- Heating degree days
- 125
- Cooling degree days
- 31
Bonsall in December
Highs average 68°20° and lows 44°7°, with 2.1 in54 mm of precipitation in a typical December.
- Record high
- 96°36° (1938)
- Record low
- 15°−9° (1900)
- Heating degree days
- 284
- Cooling degree days
- 2