Fremont, CA weather in September
Fremont is mild and dry in September: highs average 77°F and nights drop to about 58°F. Expect about 1 wet day. This is the peak of the warm season in Fremont. A great month for outdoor plans.
- Normal high
- 77°F
- Normal low
- 58°F
- Wet days
- 1
- 0.09 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 78°F | 76°F |
| Normal low | 58°F | 56°F |
| Chance of a wet day | 2% | 5% |
| Sunrise / sunset | 6:38 am / 7:37 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).
A typical September day
- 6 am58°Fdew point 53°F
- 9 am64°Fdew point 55°F
- Noon70°Fdew point 54°F
- 3 pm72°Fdew point 55°F
- 6 pm66°Fdew point 55°F
- 9 pm62°Fdew point 55°F
NOAA hourly normals (local standard time) from Oakland Metro Intl Airport (17 mi away); average wind 8 mph; clear or few clouds in 64% of daytime hours, mostly cloudy or overcast in 20%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F21 of 30
- Hot dayshigh 90°F or more3 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 0.09 in; a dry September brings about 0.0 in and a wet one about 0.2 in (25th and 75th percentiles). Days with half an inch or more are rare.
How September varies from year to year
- Warmest September, 1991-20202017: average high 82°F
- Coolest September2012: average high 73°F
- Wettest September2013: 0.5 in
- Driest September1992: no measurable precipitation
- Highest reading105°F (September 3, 2017)
- Lowest reading49°F (September 30, 2019)
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 | 77°F | 77°F | 73°F |
| Normal low | 58°F | 58°F | 54°F |
| Wet days | 0 | 1 | 3 |
| Comfortable days | 23 | 21 | 24 |
| Daylight | 13.6 h | 12.4 h | 11.2 h |
Highs change by 0°F from August and -4°F into October.
Nearby alternatives in September
- Warmer: Concord, CA30 mi · high 84°F · 1 wet day
- Cooler: San Francisco, CA28 mi · high 70°F · 1 wet day
How Fremont ranks in September
- Normal high234th warmest of 378 cities; 47th of 60 in California
- Wet days31st driest of 378
- Comfortable days11th most of 342
Heating and cooling
September has 21 heating degree days and 95 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Fremont in September?
The normal high is 77°F and the normal low is 58°F. From 1991 to 2020 the hottest September reading was 105°F (September 3, 2017).
Does it rain a lot in Fremont in September?
About 1 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 2013 (0.5 in); the driest was in 1992, with no measurable precipitation.
Is September a good time to visit Fremont?
September ranks 5th of 12 months on our comfort score for Fremont (80 out of 100). It has about 21 comfortable days and about 3 days at 90°F or hotter. The best months are June, July and August.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Newark (USC00046144), 3.3 mi SW of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Oakland Metro Intl Airport (USW00023230), 17 mi NW of the city center, 6 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: San Francisco Intl Airport (USW00023234), 21 mi WNW of the city center, 8 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: N Y. Mineta Sn Jo Intl Apt (724945-23293), 14 mi SSE of the city center, 49 ft . Hourly observations, 1991-2020.