Fullerton weather in October: Fullerton, California: normal highs, lows, rain and records for October
Fullerton in October has a normal high of 80°F and a normal low of 58°F, a daily mean of 69°F, falling from 83°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 3 days in a normal October, 0.50 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 15°C, 13 mm of precipitation in October.
- NOAA stationFullerton Municipal Airport
- Station IDUSW00003166
- Location33.87°N 117.98°W
- Elevation96 ft (29 m)
- From the center3 miles
- Population140,054
- Jan 69° 46°
- Feb 69° 48°
- Mar 71° 52°
- Apr 74° 54°
- May 76° 58°
- Jun 79° 63°
- Jul 84° 66°
- Aug 87° 66°
- Sep 85° 65°
- Oct 80° 58°
- Nov 74° 51°
- Dec 68° 46°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Fullerton in October?
The normal high is 80°F and the normal low 58°F, for a daily mean of 69.3°F. October is 5.7°F cooler than September and 6.9°F warmer than November. October is the 5th warmest month of the year in Fullerton and the 7th wettest. Across the month the normal high falls 5°F, from 83°F on October 1 to 78°F on October 31. From one year to the next October's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 67°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 12%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 83°F | 62°F | 6% | 2% |
| October 8 | 81°F | 60°F | 7% | 3% |
| October 15 | 80°F | 59°F | 9% | 4% |
| October 22 | 80°F | 57°F | 11% | 4% |
| October 31 | 78°F | 55°F | 12% | 4% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 83°F | 62°F | 6% | 2% | 11 h 50 min |
| October 2 | 82°F | 62°F | 6% | 3% | 11 h 50 min |
| October 3 | 82°F | 61°F | 6% | 3% | 11 h 50 min |
| October 4 | 82°F | 61°F | 6% | 3% | 11 h 50 min |
| October 5 | 82°F | 61°F | 7% | 3% | 11 h 40 min |
| October 6 | 82°F | 61°F | 7% | 3% | 11 h 40 min |
| October 7 | 82°F | 61°F | 7% | 3% | 11 h 40 min |
| October 8 | 81°F | 60°F | 7% | 3% | 11 h 40 min |
| October 9 | 81°F | 60°F | 8% | 3% | 11 h 40 min |
| October 10 | 81°F | 60°F | 8% | 3% | 11 h 30 min |
| October 11 | 81°F | 60°F | 8% | 3% | 11 h 30 min |
| October 12 | 81°F | 59°F | 9% | 3% | 11 h 30 min |
| October 13 | 81°F | 59°F | 9% | 4% | 11 h 30 min |
| October 14 | 81°F | 59°F | 9% | 4% | 11 h 30 min |
| October 15 | 80°F | 59°F | 9% | 4% | 11 h 20 min |
| October 16 | 80°F | 58°F | 10% | 4% | 11 h 20 min |
| October 17 | 80°F | 58°F | 10% | 4% | 11 h 20 min |
| October 18 | 80°F | 58°F | 10% | 4% | 11 h 20 min |
| October 19 | 80°F | 58°F | 10% | 4% | 11 h 20 min |
| October 20 | 80°F | 57°F | 10% | 4% | 11 h 10 min |
| October 21 | 80°F | 57°F | 10% | 4% | 11 h 10 min |
| October 22 | 80°F | 57°F | 11% | 4% | 11 h 10 min |
| October 23 | 79°F | 57°F | 11% | 4% | 11 h 10 min |
| October 24 | 79°F | 56°F | 11% | 4% | 11 h 10 min |
| October 25 | 79°F | 56°F | 11% | 4% | 11 h |
| October 26 | 79°F | 56°F | 11% | 4% | 11 h |
| October 27 | 79°F | 56°F | 11% | 4% | 11 h |
| October 28 | 79°F | 55°F | 12% | 4% | 11 h |
| October 29 | 79°F | 55°F | 12% | 4% | 11 h |
| October 30 | 78°F | 55°F | 12% | 4% | 10 h 50 min |
| October 31 | 78°F | 55°F | 12% | 4% | 10 h 50 min |
- Normal high
- 80°FOctober average
- Normal low
- 58°FOctober average
- Precipitation
- 0.50 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 11 h 50 min to 10 h 50 minOctober 1 to October 31
- Days at 70°F or more
- 28
- Days at 80°F or more
- 15
- Sunshine
- 88%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003166; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Fullerton in October?
On a given October day the chance of 0.01 inch or more is 9% on average, highest around October 31 (12%). In all, 0.50 in falls on 3 days of a normal October.
In a normal October in Fullerton, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003166.
What are the records for October in Fullerton?
The warmest October temperature on this station's record (since 1998) is 107°F, on October 23, 2017; the coldest is 45°F, on October 29, 2009. The wettest October brought 4.58 in (2004).
The October mean against the 1991-2020 normal of 69.3°F: 2021 68.2°F (−1.1), 2022 70.6°F (+1.3), 2023 70.8°F (+1.5), 2024 69.5°F (+0.2), 2025 68.6°F (−0.7). 3 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.2°F | −1.1°F | 0.51 in |
| 2022 | 70.6°F | +1.3°F | 0.32 in |
| 2023 | 70.8°F | +1.5°F | 0.00 in |
| 2024 | 69.5°F | +0.2°F | 0.00 in |
| 2025 | 68.6°F | −0.7°F | 1.79 in |
Source: records: ACIS, station USW00003166; recent months: ACIS, station USW00003166. Records and recent months use complete months only.
How does October in Fullerton compare across California?
Across the 219 places PlainClimate covers in California, October normal highs run from 58°F in Tahoma to 93°F in Brawley; Fullerton's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Fullerton in September85°F by day, 65°F at night
- Fullerton in November74°F by day, 51°F at night
- Fullerton through the yearEvery month, frost dates, records and recent years
- California in OctoberThe statewide normal and the warmest and coolest places
- Brawley: California's warmest Octobernormal high 93°F