Vacaville weather in May: Vacaville, California: normal highs, lows, rain and records for May
Vacaville in May has a normal high of 81°F and a normal low of 51°F, a daily mean of 66°F, rising from 77°F on the 1st to 85°F by the 31st. Measurable precipitation falls on 3 days in a normal May, 0.81 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 11°C, 21 mm of precipitation in May.
- NOAA stationVacaville Nut Tree Airport
- Station IDUSW00093241
- Location38.38°N 121.96°W
- Elevation109 ft (33 m)
- Population103,994
- Jan 58° 38°
- Feb 63° 40°
- Mar 68° 43°
- Apr 73° 46°
- May 81° 51°
- Jun 90° 56°
- Jul 95° 59°
- Aug 94° 58°
- Sep 91° 56°
- Oct 80° 49°
- Nov 67° 42°
- Dec 58° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Vacaville in May?
The normal high is 81°F and the normal low 51°F, for a daily mean of 66.1°F. May is 6.8°F warmer than April and 6.9°F cooler than June. May is the 5th warmest month of the year in Vacaville and the 8th wettest. Across the month the normal high rises 8°F, from 77°F on May 1 to 85°F on May 31. From one year to the next May's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Mays in three average between 63°F and 69°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 13%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 77°F | 48°F | 13% | 7% |
| May 8 | 79°F | 50°F | 11% | 6% |
| May 15 | 81°F | 51°F | 10% | 5% |
| May 22 | 83°F | 52°F | 8% | 4% |
| May 31 | 85°F | 54°F | 6% | 3% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 77°F | 48°F | 13% | 7% | 13 h 50 min |
| May 2 | 77°F | 48°F | 13% | 7% | 13 h 50 min |
| May 3 | 78°F | 49°F | 12% | 6% | 13 h 50 min |
| May 4 | 78°F | 49°F | 12% | 6% | 13 h 50 min |
| May 5 | 78°F | 49°F | 12% | 6% | 13 h 50 min |
| May 6 | 79°F | 49°F | 12% | 6% | 14 h |
| May 7 | 79°F | 49°F | 11% | 6% | 14 h |
| May 8 | 79°F | 50°F | 11% | 6% | 14 h |
| May 9 | 79°F | 50°F | 11% | 6% | 14 h |
| May 10 | 80°F | 50°F | 11% | 6% | 14 h |
| May 11 | 80°F | 50°F | 10% | 5% | 14 h 10 min |
| May 12 | 80°F | 50°F | 10% | 5% | 14 h 10 min |
| May 13 | 80°F | 51°F | 10% | 5% | 14 h 10 min |
| May 14 | 81°F | 51°F | 10% | 5% | 14 h 10 min |
| May 15 | 81°F | 51°F | 10% | 5% | 14 h 10 min |
| May 16 | 81°F | 51°F | 10% | 5% | 14 h 20 min |
| May 17 | 81°F | 51°F | 9% | 5% | 14 h 20 min |
| May 18 | 82°F | 52°F | 9% | 5% | 14 h 20 min |
| May 19 | 82°F | 52°F | 9% | 5% | 14 h 20 min |
| May 20 | 82°F | 52°F | 9% | 5% | 14 h 20 min |
| May 21 | 82°F | 52°F | 9% | 5% | 14 h 20 min |
| May 22 | 83°F | 52°F | 8% | 4% | 14 h 30 min |
| May 23 | 83°F | 52°F | 8% | 4% | 14 h 30 min |
| May 24 | 83°F | 53°F | 8% | 4% | 14 h 30 min |
| May 25 | 83°F | 53°F | 8% | 4% | 14 h 30 min |
| May 26 | 84°F | 53°F | 7% | 4% | 14 h 30 min |
| May 27 | 84°F | 53°F | 7% | 4% | 14 h 30 min |
| May 28 | 84°F | 53°F | 7% | 4% | 14 h 30 min |
| May 29 | 84°F | 54°F | 7% | 4% | 14 h 40 min |
| May 30 | 85°F | 54°F | 7% | 3% | 14 h 40 min |
| May 31 | 85°F | 54°F | 6% | 3% | 14 h 40 min |
- Normal high
- 81°FMay average
- Normal low
- 51°FMay average
- Precipitation
- 0.81 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 13 h 50 min to 14 h 40 minMay 1 to May 31
- Days at 70°F or more
- 27
- Days at 80°F or more
- 16
- Sunshine
- 91%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093241; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Vacaville in May?
On a given May day the chance of 0.01 inch or more is 10% on average, highest around May 1 (13%). In all, 0.81 in falls on 3 days of a normal May.
In a normal May in Vacaville, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093241.
What are the records for May in Vacaville?
The warmest May temperature on this station's record (since 1998) is 106°F, on May 31, 2001; the coldest is 34°F, on May 11, 2022. The wettest May brought 3.50 in (1998).
The May mean against the 1991-2020 normal of 66.1°F: 2021 69.9°F (+3.8), 2022 68.0°F (+1.9), 2023 63.9°F (−2.2), 2024 67.5°F (+1.4), 2025 67.7°F (+1.6), 2026 67.5°F (+1.4). 5 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 69.9°F | +3.8°F | 0.00 in |
| 2022 | 68.0°F | +1.9°F | 0.22 in |
| 2023 | 63.9°F | −2.2°F | 0.28 in |
| 2024 | 67.5°F | +1.4°F | 0.52 in |
| 2025 | 67.7°F | +1.6°F | 0.16 in |
| 2026 | 67.5°F | +1.4°F | 0.62 in |
Source: records: ACIS, station USW00093241; recent months: ACIS, station USW00093241. Records and recent months use complete months only.
How does May in Vacaville compare across California?
Across the 219 places PlainClimate covers in California, May normal highs run from 58°F in Tahoma to 96°F in Needles; Vacaville's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.