San Luis Obispo weather in April: San Luis Obispo, California: normal highs, lows, rain and records for April
San Luis Obispo in April has a normal high of 69°F and a normal low of 46°F, a daily mean of 57°F, rising from 68°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 6 days in a normal April, 1.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 8°C, 27 mm of precipitation in April.
- NOAA stationSan Luis Obispo Airport
- Station IDUSW00093206
- Location35.24°N 120.64°W
- Elevation200 ft (61 m)
- Population49,729
- Jan 65° 41°
- Feb 65° 42°
- Mar 67° 45°
- Apr 69° 46°
- May 72° 48°
- Jun 75° 51°
- Jul 78° 54°
- Aug 79° 55°
- Sep 80° 53°
- Oct 77° 50°
- Nov 71° 45°
- Dec 65° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Luis Obispo in April?
The normal high is 69°F and the normal low 46°F, for a daily mean of 57.4°F. April is 1.8°F warmer than March and 2.5°F cooler than May. April is the 8th warmest month of the year in San Luis Obispo and the 6th wettest. Across the month the normal high rises 2°F, from 68°F on April 1 to 70°F on April 30. From one year to the next April's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 55°F and 59°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 68°F | 45°F | 23% | 12% |
| April 8 | 68°F | 45°F | 21% | 11% |
| April 15 | 69°F | 46°F | 18% | 9% |
| April 22 | 70°F | 46°F | 16% | 7% |
| April 30 | 70°F | 46°F | 13% | 6% |
Every day of April: normal high, low and chance of precipitation (warmest afternoon April 30, coldest night April 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| April 1 | 68°F | 45°F | 23% | 12% | 12 h 30 min |
| April 2 | 68°F | 45°F | 23% | 12% | 12 h 30 min |
| April 3 | 68°F | 45°F | 22% | 12% | 12 h 40 min |
| April 4 | 68°F | 45°F | 22% | 11% | 12 h 40 min |
| April 5 | 68°F | 45°F | 22% | 11% | 12 h 40 min |
| April 6 | 68°F | 45°F | 21% | 11% | 12 h 40 min |
| April 7 | 68°F | 45°F | 21% | 11% | 12 h 50 min |
| April 8 | 68°F | 45°F | 21% | 11% | 12 h 50 min |
| April 9 | 69°F | 45°F | 21% | 10% | 12 h 50 min |
| April 10 | 69°F | 45°F | 20% | 10% | 12 h 50 min |
| April 11 | 69°F | 45°F | 20% | 10% | 12 h 50 min |
| April 12 | 69°F | 45°F | 19% | 10% | 13 h |
| April 13 | 69°F | 45°F | 19% | 9% | 13 h |
| April 14 | 69°F | 46°F | 19% | 9% | 13 h |
| April 15 | 69°F | 46°F | 18% | 9% | 13 h |
| April 16 | 69°F | 46°F | 18% | 9% | 13 h |
| April 17 | 69°F | 46°F | 17% | 8% | 13 h 10 min |
| April 18 | 69°F | 46°F | 17% | 8% | 13 h 10 min |
| April 19 | 69°F | 46°F | 17% | 8% | 13 h 10 min |
| April 20 | 70°F | 46°F | 16% | 8% | 13 h 10 min |
| April 21 | 70°F | 46°F | 16% | 7% | 13 h 20 min |
| April 22 | 70°F | 46°F | 16% | 7% | 13 h 20 min |
| April 23 | 70°F | 46°F | 15% | 7% | 13 h 20 min |
| April 24 | 70°F | 46°F | 15% | 7% | 13 h 20 min |
| April 25 | 70°F | 46°F | 15% | 7% | 13 h 20 min |
| April 26 | 70°F | 46°F | 15% | 7% | 13 h 30 min |
| April 27 | 70°F | 46°F | 14% | 6% | 13 h 30 min |
| April 28 | 70°F | 46°F | 14% | 6% | 13 h 30 min |
| April 29 | 70°F | 46°F | 14% | 6% | 13 h 30 min |
| April 30 | 70°F | 46°F | 13% | 6% | 13 h 30 min |
- Normal high
- 69°FApril average
- Normal low
- 46°FApril average
- Precipitation
- 1.05 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 12 h 30 min to 13 h 30 minApril 1 to April 30
- Days at 70°F or more
- 12
- Days at 80°F or more
- 3
- Sunshine
- 87%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093206; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Luis Obispo in April?
On a given April day the chance of 0.01 inch or more is 18% on average, highest around April 1 (23%). In all, 1.05 in falls on 6 days of a normal April.
In a normal April in San Luis Obispo, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093206.
What are the records for April in San Luis Obispo?
The warmest April temperature on this station's record (since 1998) is 101°F, on April 20, 2009; the coldest is 30°F, on April 4, 1999. The wettest April brought 4.79 in (2006).
The April mean against the 1991-2020 normal of 57.4°F: 2021 56.3°F (−1.1), 2022 59.5°F (+2.1), 2023 57.0°F (−0.4), 2024 60.1°F (+2.7), 2025 56.2°F (−1.2), 2026 59.4°F (+2.0). 3 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.3°F | −1.1°F | 0.01 in |
| 2022 | 59.5°F | +2.1°F | 0.30 in |
| 2023 | 57.0°F | −0.4°F | 0.00 in |
| 2024 | 60.1°F | +2.7°F | 2.24 in |
| 2025 | 56.2°F | −1.2°F | 0.32 in |
| 2026 | 59.4°F | +2.0°F | 1.71 in |
Source: records: ACIS, station USW00093206; recent months: ACIS, station USW00093206. Records and recent months use complete months only.
How does April in San Luis Obispo compare across California?
Across the 219 places PlainClimate covers in California, April normal highs run from 49°F in Tahoma to 87°F in Brawley; San Luis Obispo's is 69°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- San Luis Obispo in March67°F by day, 45°F at night
- San Luis Obispo in May72°F by day, 48°F at night
- San Luis Obispo through the yearEvery month, frost dates, records and recent years
- California in AprilThe statewide normal and the warmest and coolest places
- Brawley: California's warmest Aprilnormal high 87°F