Fallbrook Climate by Month
Fallbrook, California, United States
Hot summers and mild winters, with little rain, mostly from November to March.
Hot summers and mild winters, with little rain, mostly from November to March: that's Fallbrook's climate in short. Expect highs of 89°F (32°C) in August and 67°F (20°C) in February, with the coldest nights (December) near 43°F (6°C). It gets only 11 in (289 mm) of rain a year. May to September are almost completely dry.
- Warmest month
- 89°F(32°C)
- Average high, August
- Coldest nights
- 43°F(6°C)
- Average low, December
- Rain per year
- 11 in(289 mm)
- Wettest: February
- Humidity
- 55%
- Sunniest: June
Best and worst months in Fallbrook
Best for weatherThe most comfortable weather comes in May and November, with highs around 75°F (24°C) and about 0.7 in (19 mm) of rain a month.
Least pleasantAugust and September are the least pleasant; August is the hottest, with highs of 89°F (32°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Fallbrook weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 68°F(20°C) | 43°F(6°C) | 2.0 in(52 mm) | 53% | 3.0 |
| FebFebruary | 67°F(20°C) | 44°F(7°C) | 2.3 in(59 mm) | 53% | 3.5 |
| MarMarch | 69°F(21°C) | 46°F(8°C) | 1.5 in(39 mm) | 62% | 5.0 |
| AprApril | 73°F(23°C) | 48°F(9°C) | 1.1 in(28 mm) | 56% | 6.0 |
| MayMayBest | 75°F(24°C) | 53°F(12°C) | 0.3 in(8 mm) | 59% | 6.4 |
| JunJune | 80°F(27°C) | 56°F(13°C) | 0.1 in(2 mm) | 60% | 6.9 |
| JulJuly | 86°F(30°C) | 60°F(15°C) | 0.1 in(2 mm) | 58% | 6.8 |
| AugAugust | 89°F(32°C) | 62°F(17°C) | 0.1 in(2 mm) | 53% | 6.6 |
| SepSeptember | 87°F(31°C) | 60°F(16°C) | 0.2 in(6 mm) | 53% | 5.5 |
| OctOctober | 83°F(28°C) | 55°F(13°C) | 0.4 in(10 mm) | 50% | 4.2 |
| NovNovemberBest | 75°F(24°C) | 48°F(9°C) | 1.1 in(29 mm) | 48% | 3.4 |
| DecDecember | 69°F(20°C) | 43°F(6°C) | 2.0 in(52 mm) | 53% | 2.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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