Fallbrook, California climate: Normal weather by month, frost dates and records
Fallbrook's normal year runs from 46°F February nights to 89°F August afternoons, with 15.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.4°C, February lows of 8°C, August highs of 32°C, 389 mm of precipitation a year.
- NOAA stationFallbrook (5 mi NE)
- Station IDUSW00053151
- Location33.44°N 117.19°W
- Elevation1,140 ft (348 m)
- From the center5 miles
- Population (census place)32,467
On October 23, the normal high in Fallbrook is 82°F and the normal low 57°F, and the chance of measurable rain or snow is 10%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Fallbrook.
- Jan 68° 47°
- Feb 67° 46°
- Mar 70° 48°
- Apr 72° 51°
- May 75° 53°
- Jun 81° 56°
- Jul 87° 60°
- Aug 89° 62°
- Sep 88° 62°
- Oct 83° 58°
- Nov 74° 52°
- Dec 67° 46°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Fallbrook each month?
August is the warmest month, with normal highs of 89°F; February the coldest, with normal lows of 46°F. The most precipitation falls in February (3.74 in), the least in July (0.08 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 68°F | 47°F | 57.4°F | 3.17 | 6 | <1 | <1 | 10 h 10 min |
| February | 67°F | 46°F | 56.6°F | 3.74 | 6 | <1 | <1 | 11 h |
| March | 70°F | 48°F | 59.0°F | 2.02 | 6 | 1 | <1 | 12 h |
| April | 72°F | 51°F | 61.3°F | 1.00 | 4 | 2 | <1 | 13 h |
| May | 75°F | 53°F | 64.1°F | 0.36 | 5 | 2 | <1 | 13 h 50 min |
| June | 81°F | 56°F | 68.3°F | 0.12 | 2 | 5 | <1 | 14 h 20 min |
| July | 87°F | 60°F | 73.6°F | 0.08 | 2 | 10 | <1 | 14 h 10 min |
| August | 89°F | 62°F | 75.5°F | 0.22 | 1 | 14 | <1 | 13 h 30 min |
| September | 88°F | 62°F | 74.8°F | 0.11 | 2 | 14 | <1 | 12 h 30 min |
| October | 83°F | 58°F | 70.6°F | 0.70 | 3 | 9 | <1 | 11 h 20 min |
| November | 74°F | 52°F | 63.1°F | 1.15 | 5 | 4 | <1 | 10 h 30 min |
| December | 67°F | 46°F | 56.6°F | 2.64 | 7 | <1 | <1 | 10 h |
| Year (annual) | 77°F | 53°F | 65.1°F | 15.31 | 48 | 60 | <1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 20°C | 9°C | 14.1°C | 81 mm |
| February | 19°C | 8°C | 13.7°C | 95 mm |
| March | 21°C | 9°C | 15.0°C | 51 mm |
| April | 22°C | 10°C | 16.3°C | 25 mm |
| May | 24°C | 12°C | 17.8°C | 9 mm |
| June | 27°C | 13°C | 20.2°C | 3 mm |
| July | 31°C | 16°C | 23.1°C | 2 mm |
| August | 32°C | 17°C | 24.2°C | 6 mm |
| September | 31°C | 17°C | 23.8°C | 3 mm |
| October | 28°C | 14°C | 21.4°C | 18 mm |
| November | 24°C | 11°C | 17.3°C | 29 mm |
| December | 19°C | 8°C | 13.7°C | 67 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00053151; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Fallbrook?
Normal highs sit between 65°F and 85°F in January, February, March, April, May, June, October, November and December. Of those, June has the fewest days with rain (2).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00053151.
When is the last frost in Fallbrook?
A night at 32°F or colder comes in only 17% of years in Fallbrook (NOAA). NOAA's median date of the last spring frost is February 2 and of the first autumn frost January 30.
NOAA puts the median frost-free season at 365 days, and the season without a hard freeze (28°F) at 365 days.
The USDA's 2023 Plant Hardiness Zone Map puts Fallbrook in zone 10a in ZIP code 92028.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00053151; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Fallbrook?
In a normal year in Fallbrook, 60 days a year reach 90°F (9 of them 100°F or more), nights almost never fall to freezing and 48 days bring measurable precipitation.
- Days at 90°F or more
- 60a normal year
- Days at 100°F or more
- 9a normal year
- Nights at 32°F or colder
- fewer than 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 48a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USW00053151.
How sunny is Fallbrook?
Over a year 87% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Fallbrook, 5.4 kWh per square metre a day. August is the sunniest month (92%) and February the cloudiest (83%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 85% | 3.3 |
| February | 83% | 4.1 |
| March | 85% | 5.4 |
| April | 86% | 6.5 |
| May | 83% | 6.9 |
| June | 85% | 7.3 |
| July | 89% | 7.4 |
| August | 92% | 7.0 |
| September | 91% | 6.0 |
| October | 88% | 4.6 |
| November | 87% | 3.6 |
| December | 83% | 2.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Fallbrook need?
A normal year in Fallbrook brings 1,368 heating degree days, 75% fewer than the median U.S. place (5,373), and 1,412 cooling degree days, 56% more than the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 5,564 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 248 | 13 |
| February | 249 | 13 |
| March | 206 | 20 |
| April | 145 | 34 |
| May | 82 | 52 |
| June | 14 | 115 |
| July | 1 | 267 |
| August | 0 | 327 |
| September | 2 | 295 |
| October | 25 | 197 |
| November | 125 | 68 |
| December | 271 | 11 |
| Year (annual) | 1,368 | 1,412 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00053151. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Fallbrook been warmer than normal lately?
2025 averaged 66.0°F, 0.9°F above the 1991-2020 normal of 65.1°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.3°F | +0.2°F | 11.66 |
| 2022 | 66.6°F | +1.5°F | 8.72 |
| 2023 | 63.6°F | −1.5°F | 23.96 |
| 2024 | 65.0°F | −0.1°F | 16.68 |
| 2025 | 66.0°F | +0.9°F | 15.32 |
Source: observed years: ACIS, station USW00053151. A year counts only with all twelve months complete.
How does Fallbrook's climate compare?
Fallbrook is warmer than 183 of the other 218 places with their own NOAA record in California, and wetter than 107. Across the 7,247 U.S. stations with normals, its annual mean of 65.1°F is warmer than 88%.
In the Köppen classification computed from these normals, Fallbrook is Csa: temperate, dry-summer, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Fallbrook share this climate record?
5 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Murrieta, CAalso near: Lake Elsinore (12 mi, 66.0°F a year); San Jacinto (20 mi, 65.0°F a year)112,539 people · 9 mi N
- Temecula, CAalso near: Lake Elsinore (18 mi, 66.0°F a year); Camp Pendleton Marine Corps Air Station (18 mi, 62.3°F a year)112,431 people · 5 mi NE
- French Valley, CA42,550 people · 12 mi NE
- Rainbow, CA1,793 people · 4 mi SE
- Pala, CA924 people · 9 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Fallbrook's climate
What is the coldest month in Fallbrook?
February, with a normal high of 67°F and a normal low of 46°F. The warmest is August (89°F by day, 62°F at night).
What is the rainiest month in Fallbrook?
February, with 3.74 in of precipitation in a normal year; the driest is July with 0.08 in.
What plant hardiness zone is Fallbrook in?
The USDA's 2023 map puts Fallbrook in zone 10a in ZIP code 92028.
Nearby and next
- Fallbrook in OctoberThis month day by day, its records and recent years
- California climateThe statewide normals and every place in the state
- Camp Pendleton Marine Corps Air Station, CA13 miles from this station, 62.3°F a year
- Vista, CA14 miles from this station, 62.7°F a year
- Valley Center, CA17 miles from this station, 62.7°F a year
- Oceanside, CA18 miles from this station, 61.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made