Concord, CA weather in September
In September, Concord sees highs around 84°F and lows around 50°F: warm and dry. Rain falls on about 1 day. Good for outdoor plans.
- Normal high
- 84°F
- Normal low
- 50°F
- Wet days
- 1
- 0.06 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 86°F | 81°F |
| Normal low | 50°F | 48°F |
| Chance of a wet day | 1% | 4% |
| Sunrise / sunset | 6:38 am / 7:38 pm | 7:03 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).
A typical September day
- 6 am57°Fdew point 51°F
- 9 am70°Fdew point 51°F
- Noon81°Fdew point 50°F
- 3 pm85°Fdew point 48°F
- 6 pm76°Fdew point 50°F
- 9 pm65°Fdew point 51°F
NOAA hourly normals (local standard time) from Travis AFB (21 mi away); average wind 14 mph; clear or few clouds in 87% of daytime hours, mostly cloudy or overcast in 7%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F9 of 30
- Hot dayshigh 90°F or more8 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow1 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 0.06 in; a dry September brings about 0.0 in and a wet one about 0.08 in (25th and 75th percentiles). Days with half an inch or more are rare.
How September varies from year to year
- Warmest September, 1991-20201997: average high 88°F
- Coolest September2005: average high 81°F
- Wettest September2014: 0.4 in
- Driest September1992: no measurable precipitation
- Highest reading108°F (September 3, 2017)
- Lowest reading40°F (September 22, 2017)
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 | 87°F | 84°F | 76°F |
| Normal low | 51°F | 50°F | 46°F |
| Wet days | 0 | 1 | 3 |
| Comfortable days | 5 | 9 | 21 |
| Daylight | 13.6 h | 12.4 h | 11.2 h |
Highs change by -3°F from August and -8°F into October.
Nearby alternatives in September
- Warmer: Tracy, CA37 mi · high 90°F · 1 wet day
- Cooler: Hayward, CA22 mi · high 75°F · 1 wet day
How Concord ranks in September
- Normal high143rd warmest of 378 cities; 33rd of 60 in California
- Wet days16th driest of 378
- Comfortable days162nd most of 342
What to pack for Concord in September
- Layers – afternoons near 84°F but nights near 50°F
Heating and cooling
September has 33 heating degree days and 90 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Concord in September?
The normal high is 84°F and the normal low is 50°F. From 1991 to 2020 the hottest September reading was 108°F (most recently on September 3, 2017).
Does it rain a lot in Concord in September?
About 1 days in September have at least 0.01 in of precipitation, and the normal total is 0.06 in. The wettest September in 1991-2020 was in 2014 (0.4 in); the driest was in 1992, with no measurable precipitation.
Is September a good time to visit Concord?
September ranks 7th of 12 months on our comfort score for Concord (61 out of 100). It has about 9 comfortable days and about 8 days at 90°F or hotter. The best months are April and May.
Where the numbers come from
- Temperature: Martinez WTP (USC00045378), 5.1 mi WNW of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Concord Wwtp (USC00041967), 2.1 mi W of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Concord Buchanan Fld (USW00023254), 1.6 mi NW of the city center, 18 ft (57 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Travis AFB (USW00023202), 21 mi NNE of the city center, 59 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Travis Air Force Base (745160-23202), 21 mi NNE of the city center, 62 ft . Hourly observations, 1991-2020.