Hollister weather in September: Hollister, California: normal highs, lows, rain and records for September
Hollister in September has a normal high of 81°F and a normal low of 53°F, a daily mean of 67°F, falling from 82°F on the 1st to 80°F by the 30th. Measurable precipitation falls on 0 days in a normal September, 0.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 11°C, 1 mm of precipitation in September.
- NOAA stationHollister 2
- Station IDUSC00044025
- Location36.85°N 121.42°W
- Elevation275 ft (84 m)
- Population45,033
- Jan 60° 39°
- Feb 62° 41°
- Mar 66° 43°
- Apr 69° 45°
- May 73° 48°
- Jun 78° 51°
- Jul 80° 54°
- Aug 81° 54°
- Sep 81° 53°
- Oct 77° 48°
- Nov 67° 42°
- Dec 59° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Hollister in September?
The normal high is 81°F and the normal low 53°F, for a daily mean of 66.8°F. September is 1.1°F cooler than August and 4.5°F warmer than October. September is the 2nd warmest month of the year in Hollister and the 10th wettest. Across the month the normal high falls 2°F, from 82°F on September 1 to 80°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 65°F and 69°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 4%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 82°F | 54°F | 1% | 0% |
| September 8 | 82°F | 53°F | 1% | 0% |
| September 15 | 81°F | 53°F | 2% | 1% |
| September 22 | 80°F | 52°F | 3% | 1% |
| September 30 | 80°F | 51°F | 4% | 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 | 82°F | 54°F | 1% | 0% | 13 h |
| September 2 | 82°F | 54°F | 1% | 0% | 13 h |
| September 3 | 82°F | 54°F | 1% | 0% | 13 h |
| September 4 | 82°F | 54°F | 1% | 0% | 12 h 50 min |
| September 5 | 82°F | 54°F | 1% | 0% | 12 h 50 min |
| September 6 | 82°F | 54°F | 1% | 0% | 12 h 50 min |
| September 7 | 82°F | 54°F | 1% | 0% | 12 h 50 min |
| September 8 | 82°F | 53°F | 1% | 0% | 12 h 40 min |
| September 9 | 82°F | 53°F | 1% | 0% | 12 h 40 min |
| September 10 | 81°F | 53°F | 1% | 1% | 12 h 40 min |
| September 11 | 81°F | 53°F | 2% | 1% | 12 h 40 min |
| September 12 | 81°F | 53°F | 2% | 1% | 12 h 40 min |
| September 13 | 81°F | 53°F | 2% | 1% | 12 h 30 min |
| September 14 | 81°F | 53°F | 2% | 1% | 12 h 30 min |
| September 15 | 81°F | 53°F | 2% | 1% | 12 h 30 min |
| September 16 | 81°F | 53°F | 2% | 1% | 12 h 30 min |
| September 17 | 81°F | 53°F | 2% | 1% | 12 h 20 min |
| September 18 | 81°F | 53°F | 2% | 1% | 12 h 20 min |
| September 19 | 81°F | 52°F | 2% | 1% | 12 h 20 min |
| September 20 | 81°F | 52°F | 3% | 1% | 12 h 20 min |
| September 21 | 81°F | 52°F | 3% | 1% | 12 h 10 min |
| September 22 | 80°F | 52°F | 3% | 1% | 12 h 10 min |
| September 23 | 80°F | 52°F | 3% | 2% | 12 h 10 min |
| September 24 | 80°F | 52°F | 3% | 2% | 12 h 10 min |
| September 25 | 80°F | 52°F | 3% | 2% | 12 h 10 min |
| September 26 | 80°F | 51°F | 3% | 2% | 12 h |
| September 27 | 80°F | 51°F | 4% | 2% | 12 h |
| September 28 | 80°F | 51°F | 4% | 2% | 12 h |
| September 29 | 80°F | 51°F | 4% | 2% | 12 h |
| September 30 | 80°F | 51°F | 4% | 2% | 11 h 50 min |
- Normal high
- 81°FSeptember average
- Normal low
- 53°FSeptember average
- Precipitation
- 0.05 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 28
- Days at 80°F or more
- 16
- Sunshine
- 91%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00044025; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Hollister in September?
On a given September day the chance of 0.01 inch or more is 2% on average, highest around September 30 (4%). In all, 0.05 in falls on 0 days of a normal September.
In a normal September in Hollister, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00044025.
What are the records for September in Hollister?
The warmest September temperature on this station's record (since 1975) is 111°F, on September 6, 2020; the coldest is 38°F, on September 10, 2021. The wettest September brought 4.25 in (1976).
The September mean against the 1991-2020 normal of 66.8°F: 2021 67.0°F (+0.2), 2022 72.4°F (+5.6), 2023 65.7°F (−1.1), 2024 69.2°F (+2.4), 2025 70.0°F (+3.3). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.0°F | +0.2°F | 0.00 in |
| 2022 | 72.4°F | +5.6°F | – |
| 2023 | 65.7°F | −1.1°F | 0.00 in |
| 2024 | 69.2°F | +2.4°F | 0.00 in |
| 2025 | 70.0°F | +3.3°F | 0.00 in |
Source: records: ACIS, station USC00044025; recent months: ACIS, station USC00044025. Records and recent months use complete months only.
How does September in Hollister 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; Hollister's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Hollister in August81°F by day, 54°F at night
- Hollister in October77°F by day, 48°F at night
- Hollister through the yearEvery month, frost dates, records and recent years
- California in SeptemberThe statewide normal and the warmest and coolest places
- Brawley: California's warmest Septembernormal high 104°F