Grass Valley weather in October: Grass Valley, California: normal highs, lows, rain and records for October
Grass Valley in October has a normal high of 72°F and a normal low of 44°F, a daily mean of 58°F, falling from 78°F on the 1st to 66°F by the 31st. Measurable precipitation falls on 4 days in a normal October, 2.56 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 7°C, 65 mm of precipitation in October.
- NOAA stationGrass Valley #2
- Station IDUSC00043573
- Location39.20°N 121.07°W
- Elevation2,400 ft (732 m)
- Population14,085
- Jan 54° 33°
- Feb 55° 34°
- Mar 58° 37°
- Apr 63° 40°
- May 71° 47°
- Jun 80° 53°
- Jul 88° 58°
- Aug 87° 57°
- Sep 82° 52°
- Oct 72° 44°
- Nov 60° 37°
- Dec 53° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Grass Valley in October?
The normal high is 72°F and the normal low 44°F, for a daily mean of 58.2°F. October is 9.0°F cooler than September and 9.8°F warmer than November. October is the 6th warmest month of the year in Grass Valley and the 7th wettest. Across the month the normal high falls 12°F, from 78°F on October 1 to 66°F on October 31. From one year to the next October's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 55°F and 61°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 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 78°F | 48°F | 9% | 6% |
| October 8 | 75°F | 46°F | 12% | 8% |
| October 15 | 73°F | 44°F | 14% | 10% |
| October 22 | 70°F | 43°F | 17% | 12% |
| October 31 | 66°F | 40°F | 21% | 15% |
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 | 78°F | 48°F | 9% | 6% | 11 h 50 min |
| October 2 | 78°F | 48°F | 10% | 6% | 11 h 50 min |
| October 3 | 77°F | 48°F | 10% | 7% | 11 h 40 min |
| October 4 | 77°F | 48°F | 10% | 7% | 11 h 40 min |
| October 5 | 76°F | 47°F | 11% | 7% | 11 h 40 min |
| October 6 | 76°F | 47°F | 11% | 7% | 11 h 40 min |
| October 7 | 76°F | 47°F | 11% | 7% | 11 h 30 min |
| October 8 | 75°F | 46°F | 12% | 8% | 11 h 30 min |
| October 9 | 75°F | 46°F | 12% | 8% | 11 h 30 min |
| October 10 | 75°F | 46°F | 12% | 8% | 11 h 30 min |
| October 11 | 74°F | 46°F | 12% | 8% | 11 h 20 min |
| October 12 | 74°F | 45°F | 13% | 9% | 11 h 20 min |
| October 13 | 73°F | 45°F | 13% | 9% | 11 h 20 min |
| October 14 | 73°F | 45°F | 14% | 9% | 11 h 20 min |
| October 15 | 73°F | 44°F | 14% | 10% | 11 h 10 min |
| October 16 | 72°F | 44°F | 14% | 10% | 11 h 10 min |
| October 17 | 72°F | 44°F | 15% | 10% | 11 h 10 min |
| October 18 | 71°F | 44°F | 15% | 10% | 11 h 10 min |
| October 19 | 71°F | 43°F | 15% | 11% | 11 h |
| October 20 | 71°F | 43°F | 16% | 11% | 11 h |
| October 21 | 70°F | 43°F | 16% | 11% | 11 h |
| October 22 | 70°F | 43°F | 17% | 12% | 11 h |
| October 23 | 69°F | 42°F | 17% | 12% | 10 h 50 min |
| October 24 | 69°F | 42°F | 17% | 13% | 10 h 50 min |
| October 25 | 69°F | 42°F | 18% | 13% | 10 h 50 min |
| October 26 | 68°F | 42°F | 18% | 13% | 10 h 50 min |
| October 27 | 68°F | 41°F | 19% | 14% | 10 h 50 min |
| October 28 | 67°F | 41°F | 19% | 14% | 10 h 40 min |
| October 29 | 67°F | 41°F | 20% | 14% | 10 h 40 min |
| October 30 | 67°F | 41°F | 20% | 15% | 10 h 40 min |
| October 31 | 66°F | 40°F | 21% | 15% | 10 h 40 min |
- Normal high
- 72°FOctober average
- Normal low
- 44°FOctober average
- Precipitation
- 2.56 inmonth total
- Days with precipitation
- 40.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 1
- Daylight
- 11 h 50 min to 10 h 40 minOctober 1 to October 31
- Days at 70°F or more
- 20
- Days at 80°F or more
- 8
- Sunshine
- 89%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00043573; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Grass Valley in October?
On a given October day the chance of 0.01 inch or more is 15% on average, highest around October 31 (21%). In all, 2.56 in falls on 4 days of a normal October, 1 of them with an inch or more.
In a normal October in Grass Valley, 1 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00043573.
What are the records for October in Grass Valley?
The warmest October temperature on this station's record (since 1966) is 98°F, on October 3, 2024; the coldest is 27°F, on October 14, 1969. The wettest October brought 14.93 in (2021).
The October mean against the 1991-2020 normal of 58.2°F: 2021 55.5°F (−2.7), 2022 62.0°F (+3.8), 2023 58.9°F (+0.7), 2024 63.5°F (+5.3), 2025 55.8°F (−2.4). 3 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 55.5°F | −2.7°F | 14.93 in |
| 2022 | 62.0°F | +3.8°F | 0.00 in |
| 2023 | 58.9°F | +0.7°F | 1.59 in |
| 2024 | 63.5°F | +5.3°F | 1.06 in |
| 2025 | 55.8°F | −2.4°F | 4.23 in |
Source: records: ACIS, station USC00043573; recent months: ACIS, station USC00043573. Records and recent months use complete months only.
How does October in Grass Valley 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; Grass Valley's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Grass Valley in September82°F by day, 52°F at night
- Grass Valley in November60°F by day, 37°F at night
- Grass Valley 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