Pomona, CA weather in May
In May, Pomona sees highs around 80°F and lows around 56°F: warm and mostly dry. Rain falls on about 4 days. Great for outdoor plans.
- Normal high
- 80°F
- Normal low
- 56°F
- Wet days
- 4
- 0.8 in total
- Daylight
- 13.9 h
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 78°F | 82°F |
| Normal low | 54°F | 57°F |
| Chance of a wet day | 13% | 10% |
| Sunrise / sunset | 6:01 am / 7:34 pm | 5:40 am / 7:56 pm |
| Daylight | 13.6 h | 14.3 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 May day
- 6 am58°Fdew point 50°F
- 9 am65°Fdew point 50°F
- Noon73°Fdew point 50°F
- 3 pm74°Fdew point 50°F
- 6 pm69°Fdew point 49°F
- 9 pm63°Fdew point 50°F
NOAA hourly normals (local standard time) from Burbank Glendale Pasadena Airport (36 mi away); average wind 6 mph; clear or few clouds in 73% of daytime hours, mostly cloudy or overcast in 22%.
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)16 of 31
- Hot dayshigh 90°F or more5 of 31
- Wet daysat least 0.01 in of rain or melted snow4 of 31
- Notable rainat least 0.10 in2 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 0.8 in; a dry May brings about 0.05 in and a wet one about 0.8 in (25th and 75th percentiles). Days with half an inch or more are rare.
How May varies from year to year
- Warmest May, 1991-20202020: average high 85°F
- Coolest May2015: average high 75°F
- Wettest May1998: 6.9 in
- Driest May1993: no measurable precipitation
- Highest reading103°F (May 13, 2013)
- Lowest reading42°F (May 1, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 76°F | 80°F | 86°F |
| Normal low | 51°F | 56°F | 60°F |
| Wet days | 4 | 4 | 2 |
| Comfortable days | 16 | 16 | 7 |
| Daylight | 13.1 h | 13.9 h | 14.4 h |
Highs change by +4°F from April and +6°F into June.
Nearby alternatives in May
- Warmer: Palm Springs, CA71 mi · high 95°F · 0 wet days
- Drier: Palm Springs, CA71 mi · high 95°F · 0 wet days
- Cooler: West Covina, CA11 mi · high 74°F · 4 wet days
How Pomona ranks in May
- Normal high144th warmest of 378 cities; 23rd of 60 in California
- Wet days67th driest of 378
Heating and cooling
May has 37 heating degree days and 121 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Pomona in May?
The normal high is 80°F and the normal low is 56°F. From 1991 to 2020 the hottest May reading was 103°F (most recently on May 13, 2013).
Does it rain a lot in Pomona in May?
About 4 days in May have at least 0.01 in of precipitation, and the normal total is 0.8 in. The wettest May in 1991-2020 was in 1998 (6.9 in); the driest was in 1993, with no measurable precipitation.
Is May a good time to visit Pomona?
May ranks 2nd of 12 months on our comfort score for Pomona (73 out of 100). It has about 16 comfortable days (judged by temperature only) and about 5 days at 90°F or hotter. The best months are March, April and May.
Where the numbers come from
- Temperature: Ontario Intl Airport (USW00003102), 8.7 mi E of the city center, 949 ft (100 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Rain: San Gabriel Canyon PH (USC00047776), 11 mi NW of the city center, 744 ft (105 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Covina City Yard Fc387b (USC00042090), 7.7 mi WNW of the city center, 607 ft (242 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Pomona/Fairplex (USC00047050), 2.0 mi NNW of the city center, 999 ft (150 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Burbank Glendale Pasadena Airport (USW00023152), 36 mi WNW of the city center, 741 ft (108 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: daily humidity and wind (no station close enough or similar enough in elevation).