Monterey, CA weather in September
September in Monterey: mild and dry. Highs 71°F, lows 53°F, about 2 days with rain. This is the peak of the warm season in Monterey. A great month for outdoor plans.
- Normal high
- 71°F
- Normal low
- 53°F
- Wet days
- 2
- 0.09 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 70°F | 72°F |
| Normal low | 54°F | 53°F |
| Chance of a wet day | 5% | 7% |
| Sunrise / sunset | 6:38 am / 7:36 pm | 7:02 am / 6:53 pm |
| Daylight | 13.0 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F20 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph4 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow2 of 30
- Notable rainat least 0.10 in0 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 0.09 in; a dry September brings about 0.0 in and a wet one about 0.1 in (25th and 75th percentiles). Days with half an inch or more are rare.
How September varies from year to year
- Warmest September, 1991-20202015: average high 77°F
- Coolest September2012: average high 64°F
- Wettest September2007: 0.5 in
- Driest September1995: no measurable precipitation
- Highest reading104°F (September 2, 2017)
- Lowest reading45°F (September 30, 2009)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 69°F | 71°F | 71°F |
| Normal low | 54°F | 53°F | 52°F |
| Wet days | 2 | 2 | 4 |
| Comfortable days | 20 | 20 | 18 |
| Daylight | 13.5 h | 12.4 h | 11.3 h |
Highs change by +2°F from August and 0°F into October.
Nearby alternatives in September
- Warmer: San Jose, CA51 mi · high 81°F · 1 wet day
How Monterey ranks in September
- Normal high339th warmest of 378 cities; 59th of 60 in California
- Wet days55th driest of 378
- Comfortable days18th most of 342
Heating and cooling
September has 110 heating degree days and 24 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Monterey in September?
The normal high is 71°F and the normal low is 53°F. From 1991 to 2020 the hottest September reading was 104°F (September 2, 2017).
Does it rain a lot in Monterey in September?
About 2 days in September have at least 0.01 in of precipitation, and the normal total is 0.09 in. The wettest September in 1991-2020 was in 2007 (0.5 in); the driest was in 1995, with no measurable precipitation.
Is September a good time to visit Monterey?
September ranks 3rd of 12 months on our comfort score for Monterey (79 out of 100). It has about 20 comfortable days and about 1 day at 90°F or hotter. The best months are July and August.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Monterey (USC00045795), 0.9 mi SW of the city center, 260 ft (241 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: N Y. Mineta Sn Jo Intl Apt (724945-23293), 53 mi N of the city center, 49 ft . Hourly observations, 1991-2020.
- Not available for this location: humidity and wind by hour and cloud cover (no station close enough or similar enough in elevation).