Carlsbad weather in September: Carlsbad, California: normal highs, lows, rain and records for September
Carlsbad in September has a normal high of 76°F and a normal low of 64°F, a daily mean of 70°F, falling from 76°F on the 1st to 74°F by the 30th. Measurable precipitation falls on 2 days in a normal September, 0.11 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 18°C, 3 mm of precipitation in September.
- NOAA stationCarlsbad Palomar Airport
- Station IDUSW00003177
- Location33.13°N 117.28°W
- Elevation328 ft (100 m)
- From the centerunder 1 mile
- Population113,575
- Jan 65° 48°
- Feb 64° 49°
- Mar 65° 51°
- Apr 66° 53°
- May 68° 57°
- Jun 70° 60°
- Jul 74° 64°
- Aug 76° 65°
- Sep 76° 64°
- Oct 73° 59°
- Nov 70° 52°
- Dec 65° 47°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Carlsbad in September?
The normal high is 76°F and the normal low 64°F, for a daily mean of 69.6°F. September is 0.9°F cooler than August and 3.5°F warmer than October. September is the 2nd warmest month of the year in Carlsbad and the 9th wettest. Across the month the normal high falls 2°F, from 76°F on September 1 to 74°F on September 30. From one year to the next September's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 68°F and 72°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 11%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 76°F | 65°F | 4% | 1% |
| September 8 | 76°F | 65°F | 5% | 1% |
| September 15 | 76°F | 64°F | 7% | 1% |
| September 22 | 75°F | 63°F | 9% | 1% |
| September 30 | 74°F | 62°F | 11% | 2% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 76°F | 65°F | 4% | 1% | 12 h 50 min |
| September 2 | 76°F | 65°F | 4% | 1% | 12 h 50 min |
| September 3 | 76°F | 65°F | 4% | 1% | 12 h 50 min |
| September 4 | 76°F | 65°F | 5% | 1% | 12 h 50 min |
| September 5 | 76°F | 65°F | 5% | 1% | 12 h 50 min |
| September 6 | 76°F | 65°F | 5% | 1% | 12 h 40 min |
| September 7 | 76°F | 65°F | 5% | 1% | 12 h 40 min |
| September 8 | 76°F | 65°F | 5% | 1% | 12 h 40 min |
| September 9 | 76°F | 64°F | 5% | 1% | 12 h 40 min |
| September 10 | 76°F | 64°F | 6% | 1% | 12 h 40 min |
| September 11 | 76°F | 64°F | 6% | 1% | 12 h 30 min |
| September 12 | 76°F | 64°F | 6% | 1% | 12 h 30 min |
| September 13 | 76°F | 64°F | 6% | 1% | 12 h 30 min |
| September 14 | 76°F | 64°F | 7% | 1% | 12 h 30 min |
| September 15 | 76°F | 64°F | 7% | 1% | 12 h 30 min |
| September 16 | 76°F | 64°F | 7% | 1% | 12 h 20 min |
| September 17 | 76°F | 64°F | 7% | 1% | 12 h 20 min |
| September 18 | 76°F | 64°F | 8% | 1% | 12 h 20 min |
| September 19 | 76°F | 63°F | 8% | 1% | 12 h 20 min |
| September 20 | 76°F | 63°F | 8% | 1% | 12 h 20 min |
| September 21 | 75°F | 63°F | 8% | 1% | 12 h 10 min |
| September 22 | 75°F | 63°F | 9% | 1% | 12 h 10 min |
| September 23 | 75°F | 63°F | 9% | 1% | 12 h 10 min |
| September 24 | 75°F | 63°F | 9% | 2% | 12 h 10 min |
| September 25 | 75°F | 63°F | 9% | 2% | 12 h 10 min |
| September 26 | 75°F | 62°F | 10% | 2% | 12 h |
| September 27 | 75°F | 62°F | 10% | 2% | 12 h |
| September 28 | 75°F | 62°F | 10% | 2% | 12 h |
| September 29 | 75°F | 62°F | 10% | 2% | 12 h |
| September 30 | 74°F | 62°F | 11% | 2% | 12 h |
- Normal high
- 76°FSeptember average
- Normal low
- 64°FSeptember average
- Precipitation
- 0.11 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 28
- Days at 80°F or more
- 6
- Sunshine
- 91%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003177; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Carlsbad in September?
On a given September day the chance of 0.01 inch or more is 7% on average, highest around September 30 (11%). In all, 0.11 in falls on 2 days of a normal September.
In a normal September in Carlsbad, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003177.
What are the records for September in Carlsbad?
The warmest September temperature on this station's record (since 1998) is 101°F, on September 6, 2020; the coldest is 54°F, on September 29, 2001. The wettest September brought 0.76 in (2015).
The September mean against the 1991-2020 normal of 69.6°F: 2021 68.8°F (−0.8), 2022 73.7°F (+4.1), 2023 70.6°F (+1.0), 2024 68.9°F (−0.7), 2025 70.6°F (+1.0), 2026 73.6°F (+4.0). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.8°F | −0.8°F | 0.11 in |
| 2022 | 73.7°F | +4.1°F | 0.29 in |
| 2023 | 70.6°F | +1.0°F | 0.12 in |
| 2024 | 68.9°F | −0.7°F | 0.00 in |
| 2025 | 70.6°F | +1.0°F | 0.24 in |
| 2026 | 73.6°F | +4.0°F | 0.04 in |
Source: records: ACIS, station USW00003177; recent months: ACIS, station USW00003177. Records and recent months use complete months only.
How does September in Carlsbad compare across California?
Across the 219 places PlainClimate covers in California, September normal highs run from 64°F in Eureka to 104°F in Brawley; Carlsbad's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.