Climate averages 1991–2020
Pasadena (California), United States weather
in April.
A warm, fairly dry month: the 7th warmest and the 8th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
April is a warm month in Pasadena (California), United States: daytime highs average 22.1°C and nights cool to about 9.1°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 24 mm of rain on roughly 4 days, which makes April a fairly dry month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 01 min on an average April day.
The nearest other city in this atlas is Glendale (California), United States (10 km away). In April its highs average 22.6°C, about as warm as Pasadena (California), United States, with 24 mm of rain.
Among the 498 cities listed in the United States, Pasadena (California), United States ranks joint 153rd of 498 for the warmest April highs and joint 65th of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; Pasadena (California), United States is 2.7°C warmer than that mean.
From April to May, average highs rise by 2.0°C to 24.1°C, and monthly rainfall falls from 24 mm to 12 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Pasadena (California), United States climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.8°C6.1°C | 6.1°C | 86 | 5.8 | 10.210 h |
| February | 18.0°C6.4°C | 6.4°C | 95 | 6.7 | 10.911 h |
| March | 19.7°C7.7°C | 7.7°C | 64 | 6.1 | 12.012 h |
| April, selected | 22.1°C9.1°C | 9.1°C | 24 | 3.6 | 13.013 h |
| May | 24.1°C11.6°C | 11.6°C | 12 | 2.3 | 13.914 h |
| June | 27.2°C14.3°C | 14.3°C | 2.3 | 0.5 | 14.414 h |
| July | 30.5°C17.2°C | 17.2°C | 3.1 | 0.6 | 14.214 h |
| August | 31.7°C17.9°C | 17.9°C | 0.9 | 0.2 | 13.413 h |
| September | 30.2°C16.5°C | 16.5°C | 3.9 | 0.9 | 12.412 h |
| October | 26.2°C12.9°C | 12.9°C | 18 | 2.3 | 11.411 h |
| November | 21.8°C9.1°C | 9.1°C | 22 | 3.0 | 10.410 h |
| December | 17.6°C5.8°C | 5.8°C | 58 | 5.2 | 9.910 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Glendale (California), United States in AprilUnited States · 10 kmHigh 22.6°C · Low 9.7°C · 24 mm rain
- El Monte in AprilUnited States · 14 kmHigh 23.2°C · Low 10.4°C · 22 mm rain
- East Los Angeles in AprilUnited States · 14 kmHigh 22.1°C · Low 10.3°C · 19 mm rain
- Los Angeles in AprilUnited States · 14 kmHigh 23.1°C · Low 10.0°C · 19 mm rain
- Burbank in AprilUnited States · 16 kmHigh 23.4°C · Low 10.3°C · 24 mm rain
- West Covina in AprilUnited States · 21 kmHigh 22.9°C · Low 10.2°C · 22 mm rain
- Whittier in AprilUnited States · 21 kmHigh 22.2°C · Low 10.0°C · 22 mm rain
- Downey in AprilUnited States · 23 kmHigh 22.2°C · Low 10.8°C · 19 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Pasadena) is explained once on the Pasadena (California), United States year overview and on the Sources, method and limits page.
Glendale (California), United States and Burbank lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.