May
May · October · June
87climate match
United States · 1991–2020
Best time to visit
Yountville.
May leads for comfortable weather in Yountville: typically 24.5°C by day, 8.8°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortMay
Typical high24.5°C
Typical low8.8°C
Rain in May27 mm
June
June · July · August
70climate match
April
April · May · October
86climate match
The weakest month is December, scoring 24 against May’s 87 — days reach only 14.2°C, 10° below the 24°C the score treats as ideal, and nights drop to 3.5°C.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
2714.5° / 3.5°
Feb
3717° / 4.5°
Mar
5219.1° / 5.5°
Apr
7321.2° / 6.7°
May
8724.5° / 8.8°
Jun
7728.8° / 10.7°
Jul
7330.6° / 12°
Aug
7230.6° / 11.8°
Sep
7329.8° / 10.6°
Oct
8325.6° / 8.6°
Nov
5819° / 5.4°
Dec
2414.2° / 3.5°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 14.5°C | 3.5°C | 140 mm | 9.9 | 9 h 46 | 27 | Strong coverage |
| February | 17°C | 4.5°C | 142 mm | 9.3 | 10 h 42 | 37 | Strong coverage |
| March | 19.1°C | 5.5°C | 101 mm | 9 | 11 h 50 | 52 | Strong coverage |
| April | 21.2°C | 6.7°C | 43 mm | 5.4 | 13 h 08 | 73 | Strong coverage |
| May | 24.5°C | 8.8°C | 27 mm | 3.3 | 14 h 14 | 87 | Strong coverage |
| June | 28.8°C | 10.7°C | 6 mm | 0.9 | 14 h 50 | 77 | Strong coverage |
| July | 30.6°C | 12°C | 0 mm | 0 | 14 h 36 | 73 | Strong coverage |
| August | 30.6°C | 11.8°C | 1 mm | 0.1 | 13 h 39 | 72 | Strong coverage |
| September | 29.8°C | 10.6°C | 2 mm | 0.5 | 12 h 23 | 73 | Strong coverage |
| October | 25.6°C | 8.6°C | 39 mm | 2.9 | 11 h 08 | 83 | Strong coverage |
| November | 19°C | 5.4°C | 75 mm | 6.1 | 10 h 02 | 58 | Strong coverage |
| December | 14.2°C | 3.5°C | 153 mm | 10.1 | 9 h 30 | 24 | Strong coverage |
What has changed
Yountville runs -0.8°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+1.0
Feb
-0.4
Mar
-0.8
Apr
-0.6
May
-1.3
Jun
-1.0
Jul
-2.1
Aug
-1.8
Sep
-1.2
Oct
-0.9
Nov
-0.1
Dec
0.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 28.9°C8 Jan 1962 | -6.7°C2 Jan 1960 | 172 mm4 Jan 1982 | 490 mm1995 · driest 0 mm in 2015 | 79 |
| February | 36.7°C26 Feb 1894 | -6.7°C7 Feb 1989 | 100 mm14 Feb 1986 | 480 mm1998 · driest 0 mm in 2020 | 80 |
| March | 32.2°C7 Mar 1894 | -4.4°C21 Mar 1894 | 74 mm9 Mar 1995 | 350 mm1983 · driest 1 mm in 2007 | 78 |
| April | 37.8°C28 Apr 1981 | -6.7°C12 Apr 1894 | 71 mm27 Apr 1953 | 175 mm1958 · driest 0 mm in 1962 | 79 |
| May | 40.6°C31 May 2001 | -2.8°C5 May 1952 | 42 mm27 May 1990 | 99 mm1998 · driest 0 mm in 1962 | 78 |
| June | 44.4°C14 Jun 1961 | -0.6°C12 Jun 1952 | 46 mm2 Jun 1967 | 60 mm2011 · driest 0 mm in 1981 | 79 |
| July | 46.7°C13 Jul 1972 | 1.7°C22 Jul 1894 | 26 mm8 Jul 1974 | 28 mm1974 · driest 0 mm in 2011 | 77 |
| August | 42.2°C3 Aug 1998 | 2.2°C23 Aug 1979 | 25 mm20 Aug 1997 | 26 mm1997 · driest 0 mm in 2012 | 79 |
| September | 43.3°C13 Sep 1971 | 1.1°C20 Sep 1965 | 69 mm18 Sep 1959 | 69 mm1959 · driest 0 mm in 2010 | 76 |
| October | 41.7°C2 Oct 1980 | -1.1°C24 Oct 1956 | 111 mm12 Oct 1962 | 232 mm1962 · driest 0 mm in 1995 | 75 |
| November | 32.8°C1 Nov 1985 | -5.6°C13 Nov 1985 | 137 mm21 Nov 1977 | 329 mm1973 · driest 0 mm in 1959 | 76 |
| December | 26.7°C26 Dec 1967 | -10.6°C22 Dec 1990 | 111 mm31 Dec 2005 | 429 mm1955 · driest 0 mm in 1989 | 76 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | <1 | 0 | 7 | 4 |
| February | <1 | 0 | 3 | 5 |
| March | 3 | <1 | <1 | 4 |
| April | 6 | 1 | <1 | 1 |
| May | 12 | 5 | 0 | 1 |
| June | 21 | 11 | 0 | <1 |
| July | 25 | 14 | 0 | 0 |
| August | 25 | 14 | 0 | 0 |
| September | 23 | 12 | 0 | 0 |
| October | 15 | 5 | 0 | 1 |
| November | 2 | <1 | 2 | 3 |
| December | 0 | 0 | 7 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 5% | 32% | 16% | 39% | 12.3–16.3°C |
| February | 23% | 31% | 16% | 41% | 15.2–19.5°C |
| March | 40% | 30% | 13% | 33% | 16.5–22.1°C |
| April | 60% | 18% | 5% | 17% | 19.3–24.1°C |
| May | 84% | 9% | 2% | 6% | 21.8–27.8°C |
| June | 96% | 3% | <1% | <1% | 25.8–31.3°C |
| July | 100% | <1% | 0% | 0% | 28.9–33.6°C |
| August | 99% | 1% | <1% | <1% | 28.3–33.3°C |
| September | 97% | 3% | <1% | 1% | 27.6–32.0°C |
| October | 86% | 10% | 4% | 10% | 23.4–28.3°C |
| November | 36% | 24% | 11% | 30% | 17.0–20.9°C |
| December | 4% | 31% | 15% | 36% | 12.3–16.2°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5410999
- NOAA station
- USC00048351 · SONOMA
- Station distance
- 14.4 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 38.40°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.