Hayward, CA weather in September
In September, Hayward sees highs around 75°F and lows around 56°F: mild and dry. Rain falls on about 1 day. It is one of the warmest months in Hayward. Great for outdoor plans.
- Normal high
- 75°F
- Normal low
- 56°F
- Wet days
- 1
- 0.1 in total
- Muggy days
- 0
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 75°F | 75°F |
| Normal low | 56°F | 55°F |
| Chance of a wet day | 2% | 5% |
| 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 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 (9 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°F23 of 30
- Hot dayshigh 90°F or more2 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 0.1 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 79°F
- Coolest September2012: average high 68°F
- Wettest September2013: 1.1 in
- Driest September1991: no measurable precipitation
- Highest reading104°F (September 2, 2017)
- Lowest reading49°F (September 24, 2018)
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 | 73°F | 75°F | 72°F |
| Normal low | 56°F | 56°F | 53°F |
| Wet days | 0 | 1 | 3 |
| Comfortable days | 27 | 23 | 22 |
| Daylight | 13.6 h | 12.4 h | 11.2 h |
Highs change by +2°F from August and -3°F into October.
Nearby alternatives in September
- Warmer: Concord, CA22 mi · high 84°F · 1 wet day
How Hayward ranks in September
- Normal high287th warmest of 378 cities; 51st of 60 in California
- Wet days41st driest of 378
- Comfortable days5th most of 342
Heating and cooling
September has 46 heating degree days and 56 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Hayward in September?
The normal high is 75°F and the normal low is 56°F. From 1991 to 2020 the hottest September reading was 104°F (most recently on September 2, 2017).
Does it rain a lot in Hayward in September?
About 1 days in September have at least 0.01 in of precipitation, and the normal total is 0.1 in. The wettest September in 1991-2020 was in 2013 (1.1 in); the driest was in 1991, with no measurable precipitation.
Is September a good time to visit Hayward?
September ranks 4th of 12 months on our comfort score for Hayward (83 out of 100). It has about 23 comfortable days and about 2 days at 90°F or hotter. The best months are July and August.
Where the numbers come from
- Temperature and cloud cover: San Francisco Intl Airport (USW00023234), 16 mi WSW of the city center, 8 ft (98 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Rain: Upper San Leandro Filters (USC00049185), 8.6 mi NNW of the city center, 394 ft (288 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Newark (USC00046144), 11 mi SSE of the city center, 10 ft (96 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Hayward Air Terminal (USW00093228), 2.1 mi WSW of the city center, 43 ft (63 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Oakland Metro Intl Airport (USW00023230), 8.5 mi WNW of the city center, 6 ft (100 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Francisco International Airport (724940-23234), 16 mi WSW of the city center, 10 ft (96 ft lower than the city). Hourly observations, 1991-2020.