Oceanside, CA weather in September
Oceanside is mild and dry in September: highs average 71°F and nights drop to about 64°F. There are about 1 day with rain. A great month for outdoor plans.
- Normal high
- 71°F
- Normal low
- 64°F
- Wet days
- 1
- 0.2 in total
- Muggy days
- 1
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 72°F | 70°F |
| Normal low | 65°F | 61°F |
| Chance of a wet day | 1% | 4% |
| Sunrise / sunset | 6:23 am / 7:15 pm | 6:43 am / 6:35 pm |
| Daylight | 12.8 h | 11.9 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 am60°Fdew point 55°F
- 9 am73°Fdew point 59°F
- Noon80°Fdew point 59°F
- 3 pm78°Fdew point 59°F
- 6 pm70°Fdew point 60°F
- 9 pm65°Fdew point 58°F
NOAA hourly normals (local standard time) from Camp Pendleton MCAS (7 mi away); average wind 4 mph; clear or few clouds in 82% of daytime hours, mostly cloudy or overcast in 12%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F19 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph1 of 30
- Hot dayshigh 90°F or more0 of 30
- Muggy daysdaily mean dew point 65°F or more1 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 0.2 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, 1991-20202015: average high 77°F
- Coolest September1999: average high 67°F
- Wettest September2015: 1.1 in
- Driest September1991: no measurable precipitation
- Highest reading92°F (September 3, 1998)
- Lowest reading51°F (September 30, 2013)
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 | 71°F | 71°F | 70°F |
| Normal low | 66°F | 64°F | 58°F |
| Wet days | 0 | 1 | 2 |
| Comfortable days | 12 | 19 | 25 |
| Daylight | 13.3 h | 12.4 h | 11.3 h |
Highs change by 0°F from August and -1°F into October.
Nearby alternatives in September
- Warmer: Escondido, CA18 mi · high 87°F · 1 wet day
How Oceanside ranks in September
- Normal high336th warmest of 378 cities; 58th of 60 in California
- Wet days27th driest of 378
- Comfortable days23rd most of 342
Heating and cooling
September has 13 heating degree days and 83 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Oceanside in September?
The normal high is 71°F and the normal low is 64°F. From 1991 to 2020 the hottest September reading was 92°F (September 3, 1998).
Does it rain a lot in Oceanside in September?
About 1 days in September have at least 0.01 in of precipitation, and the normal total is 0.2 in. The wettest September in 1991-2020 was in 2015 (1.1 in); the driest was in 1991, with no measurable precipitation.
Is September a good time to visit Oceanside?
September ranks 3rd of 12 months on our comfort score for Oceanside (78 out of 100). It has about 19 comfortable days. The best months are June and October.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Oceanside Marina (USC00046377), 1.3 mi NW of the city center, 10 ft (60 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Oceanside Muni Airport (USW00053121), 2.4 mi NE of the city center, 28 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Camp Pendleton MCAS (USW00003154), 7.4 mi NNE of the city center, 75 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: March AFB (USW00023119), 49 mi N of the city center, 1,516 ft (1,446 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Marine Corps Air Station (722926-03154), 7.6 mi N of the city center, 70 ft . Hourly observations, 1991-2020.