Pasadena weather in September: Pasadena, California: normal highs, lows, rain and records for September
Pasadena in September has a normal high of 90°F and a normal low of 62°F, a daily mean of 76°F, falling from 92°F on the 1st to 87°F by the 30th. Measurable precipitation falls on 1 days in a normal September, 0.22 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 16°C, 6 mm of precipitation in September.
- NOAA stationPasadena
- Station IDUSC00046719
- Location34.15°N 118.14°W
- Elevation864 ft (263 m)
- From the centerunder 1 mile
- Population137,195
- Jan 68° 46°
- Feb 69° 46°
- Mar 73° 48°
- Apr 76° 51°
- May 78° 54°
- Jun 84° 58°
- Jul 89° 62°
- Aug 91° 63°
- Sep 90° 62°
- Oct 83° 56°
- Nov 75° 50°
- Dec 67° 45°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pasadena in September?
The normal high is 90°F and the normal low 62°F, for a daily mean of 75.8°F. September is 1.4°F cooler than August and 6.1°F warmer than October. September is the 2nd warmest month of the year in Pasadena and the 9th wettest. Across the month the normal high falls 5°F, from 92°F on September 1 to 87°F on September 30. From one year to the next September's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 73°F and 78°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 6%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 92°F | 63°F | 2% | 1% |
| September 8 | 92°F | 63°F | 2% | 1% |
| September 15 | 90°F | 62°F | 3% | 1% |
| September 22 | 89°F | 61°F | 4% | 2% |
| September 30 | 87°F | 59°F | 6% | 3% |
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 | 92°F | 63°F | 2% | 1% | 13 h |
| September 2 | 92°F | 63°F | 2% | 1% | 12 h 50 min |
| September 3 | 92°F | 63°F | 2% | 1% | 12 h 50 min |
| September 4 | 92°F | 63°F | 2% | 1% | 12 h 50 min |
| September 5 | 92°F | 63°F | 2% | 1% | 12 h 50 min |
| September 6 | 92°F | 63°F | 2% | 1% | 12 h 40 min |
| September 7 | 92°F | 63°F | 2% | 1% | 12 h 40 min |
| September 8 | 92°F | 63°F | 2% | 1% | 12 h 40 min |
| September 9 | 91°F | 63°F | 2% | 1% | 12 h 40 min |
| September 10 | 91°F | 63°F | 2% | 1% | 12 h 40 min |
| September 11 | 91°F | 62°F | 3% | 1% | 12 h 30 min |
| September 12 | 91°F | 62°F | 3% | 1% | 12 h 30 min |
| September 13 | 91°F | 62°F | 3% | 1% | 12 h 30 min |
| September 14 | 91°F | 62°F | 3% | 1% | 12 h 30 min |
| September 15 | 90°F | 62°F | 3% | 1% | 12 h 30 min |
| September 16 | 90°F | 62°F | 3% | 1% | 12 h 20 min |
| September 17 | 90°F | 62°F | 4% | 1% | 12 h 20 min |
| September 18 | 90°F | 61°F | 4% | 2% | 12 h 20 min |
| September 19 | 89°F | 61°F | 4% | 2% | 12 h 20 min |
| September 20 | 89°F | 61°F | 4% | 2% | 12 h 20 min |
| September 21 | 89°F | 61°F | 4% | 2% | 12 h 10 min |
| September 22 | 89°F | 61°F | 4% | 2% | 12 h 10 min |
| September 23 | 89°F | 61°F | 5% | 2% | 12 h 10 min |
| September 24 | 88°F | 60°F | 5% | 2% | 12 h 10 min |
| September 25 | 88°F | 60°F | 5% | 2% | 12 h 10 min |
| September 26 | 88°F | 60°F | 5% | 2% | 12 h |
| September 27 | 87°F | 60°F | 5% | 2% | 12 h |
| September 28 | 87°F | 60°F | 6% | 2% | 12 h |
| September 29 | 87°F | 59°F | 6% | 3% | 12 h |
| September 30 | 87°F | 59°F | 6% | 3% | 11 h 50 min |
- Normal high
- 90°FSeptember average
- Normal low
- 62°FSeptember average
- Precipitation
- 0.22 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 16
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 28
- Sunshine
- 95%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00046719; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pasadena in September?
On a given September day the chance of 0.01 inch or more is 3% on average, highest around September 30 (6%). In all, 0.22 in falls on 1 days of a normal September.
In a normal September in Pasadena, 16 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00046719.
What are the records for September in Pasadena?
The warmest September temperature on this station's record (since 1893) is 115°F, on September 6, 2020; the coldest is 41°F, on September 27, 1911. The wettest September brought 5.88 in (1939).
The September mean against the 1991-2020 normal of 75.8°F: 2021 77.2°F (+1.4), 2022 82.8°F (+7.0), 2023 74.9°F (−0.9), 2024 77.1°F (+1.3), 2025 77.5°F (+1.7), 2026 77.5°F (+1.7). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.2°F | +1.4°F | 0.00 in |
| 2022 | 82.8°F | +7.0°F | 0.16 in |
| 2023 | 74.9°F | −0.9°F | 0.30 in |
| 2024 | 77.1°F | +1.3°F | 0.00 in |
| 2025 | 77.5°F | +1.7°F | 0.13 in |
| 2026 | 77.5°F | +1.7°F | 1.10 in |
Source: records: ACIS, station USC00046719; recent months: ACIS, station USC00046719. Records and recent months use complete months only.
How does September in Pasadena 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; Pasadena's is 90°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.