Hartley Weather in May
Average highs run from 79°F on May 1 to 87°F on May 31, and lows from 50°F to 56°F. Normal precipitation for the month is 0.78 in over about 4 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 83°F
- Average low
- 53°F
- Precipitation
- 0.78 in
- Record high
- 106°FMay 31, 2001
- Record low
- 34°FMay 10, 2022
- Chance of a freeze
- 0%
- Days of 90°F or more
- 8.2
- Daylight
- 13 h 49 min to 14 h 39 min
- Cloud cover
- 35%
- Humidity
- 65%
- Dew point
- 49°F
- Wind
- 8.1 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 79°F | 50°F | 91°F 2015 | 43°F 2018 | 15% |
| May 2 | 79°F | 51°F | 93°F 2017 | 44°F 2019 | 15% |
| May 3 | 80°F | 51°F | 96°F 2017 | 43°F 2020 | 15% |
| May 4 | 80°F | 51°F | 93°F 2021 | 39°F 1999 | 14% |
| May 5 | 80°F | 51°F | 95°F 2021 | 37°F 2024 | 14% |
| May 6 | 80°F | 51°F | 91°F 2001 | 37°F 2024 | 14% |
| May 7 | 81°F | 51°F | 97°F 2001 | 37°F 2023 | 14% |
| May 8 | 81°F | 52°F | 97°F 2001 | 41°F 1999 | 13% |
| May 9 | 81°F | 52°F | 95°F 2001 | 38°F 2003 | 13% |
| May 10 | 81°F | 52°F | 98°F 2001 | 34°F 2022 | 13% |
| May 11 | 82°F | 52°F | 95°F 2021 | 34°F 2022 | 12% |
| May 12 | 82°F | 52°F | 95°F 2021 | 41°F 2000 | 12% |
| May 13 | 82°F | 52°F | 96°F 2023 | 41°F 1999 | 12% |
| May 14 | 82°F | 53°F | 96°F 2006 | 44°F 1998 | 12% |
| May 15 | 83°F | 53°F | 100°F 2008 | 40°F 1999 | 11% |
| May 16 | 83°F | 53°F | 103°F 2008 | 43°F 2011 | 11% |
| May 17 | 83°F | 53°F | 105°F 2008 | 38°F 1998 | 11% |
| May 18 | 83°F | 53°F | 101°F 2022 | 44°F 1998 | 11% |
| May 19 | 84°F | 53°F | 101°F 2001 | 45°F 2019 | 10% |
| May 20 | 84°F | 54°F | 102°F 2001 | 43°F 1998 | 10% |
| May 21 | 84°F | 54°F | 101°F 2000 | 44°F 1998 | 10% |
| May 22 | 84°F | 54°F | 99°F 2000 | 41°F 2002 | 9% |
| May 23 | 85°F | 54°F | 102°F 2000 | 45°F 2010 | 9% |
| May 24 | 85°F | 54°F | 102°F 2022 | 44°F 2013 | 9% |
| May 25 | 85°F | 55°F | 105°F 2022 | 48°F 1998 | 9% |
| May 26 | 85°F | 55°F | 102°F 2020 | 45°F 1998 | 8% |
| May 27 | 86°F | 55°F | 104°F 2020 | 47°F 2026 | 8% |
| May 28 | 86°F | 55°F | 102°F 2020 | 42°F 2010 | 8% |
| May 29 | 86°F | 55°F | 100°F 2018 | 44°F 2011 | 7% |
| May 30 | 86°F | 55°F | 102°F 2001 | 43°F 1998 | 7% |
| May 31 | 87°F | 56°F | 106°F 2001 | 48°F 1998 | 7% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 6:11 AM, sunset 8:00 PM
- May 31
- sunrise 5:46 AM, sunset 8:25 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00049200 (Vacaville), public domain. Records: NOAA GHCN-Daily, station USW00093241, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.