June
June · May · July
85climate match
United States · 1991–2020
Best time to visit
Santa Rosa.
June leads for comfortable weather in Santa Rosa: typically 26.4°C by day, 11.1°C at night, with 6 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortJune
Typical high26.4°C
Typical low11.1°C
Rain in June6 mm
August
August · September · July
71climate match
May
May · April · October
88climate match
The weakest month is December, scoring 25 against June’s 85 — days reach only 14.7°C, 9° below the 24°C the score treats as ideal, and nights drop to 4.1°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
2714.7° / 4.3°
Feb
3416.8° / 5°
Mar
4618.6° / 6.1°
Apr
7020.7° / 7.1°
May
8422.8° / 9.2°
Jun
8526.4° / 11.1°
Jul
8427.2° / 11.7°
Aug
8128.1° / 11.8°
Sep
7928.3° / 11.1°
Oct
8425.3° / 9.2°
Nov
5718.9° / 6.1°
Dec
2514.7° / 4.1°
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 14.7°C | 4.3°C | 151 mm | 11.2 | 11.5°C | 9 h 45 | 27 | Good coverage |
| February | 16.8°C | 5°C | 164 mm | 10.3 | 11.7°C | 10 h 42 | 34 | Good coverage |
| March | 18.6°C | 6.1°C | 132 mm | 10.3 | 11.5°C | 11 h 50 | 46 | Good coverage |
| April | 20.7°C | 7.1°C | 55 mm | 6 | 10.7°C | 13 h 09 | 70 | Good coverage |
| May | 22.8°C | 9.2°C | 40 mm | 3.9 | 10.6°C | 14 h 14 | 84 | Good coverage |
| June | 26.4°C | 11.1°C | 6 mm | 0.9 | 10.7°C | 14 h 50 | 85 | Good coverage |
| July | 27.2°C | 11.7°C | 0 mm | 0.1 | 11.5°C | 14 h 36 | 84 | Good coverage |
| August | 28.1°C | 11.8°C | 1 mm | 0.2 | 12.4°C | 13 h 39 | 81 | Good coverage |
| September | 28.3°C | 11.1°C | 3 mm | 0.8 | 12.9°C | 12 h 23 | 79 | Good coverage |
| October | 25.3°C | 9.2°C | 40 mm | 3 | 12.8°C | 11 h 08 | 84 | Good coverage |
| November | 18.9°C | 6.1°C | 85 mm | 6.8 | 12.4°C | 10 h 02 | 57 | Good coverage |
| December | 14.7°C | 4.1°C | 162 mm | 10.5 | 11.8°C | 9 h 30 | 25 | Good coverage |
What has changed
Santa Rosa runs +1.0°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
+1.9
Feb
+0.7
Mar
0.0
Apr
+1.0
May
+1.1
Jun
+1.3
Jul
+0.7
Aug
+1.5
Sep
+1.2
Oct
+1.1
Nov
+0.2
Dec
+1.2
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 29.4°C9 Jan 1962 | -9.4°C3 Jan 1919 | 128 mm5 Jan 1966 | 469 mm1909 · driest 7 mm in 1962 | 119 |
| February | 33.9°C28 Feb 1923 | -6.7°C9 Feb 1929 | 144 mm26 Feb 2019 | 494 mm1998 · driest 0 mm in 2020 | 117 |
| March | 33.3°C19 Mar 2026 | -4.4°C6 Mar 1918 | 100 mm9 Mar 1995 | 400 mm1983 · driest 1 mm in 1988 | 114 |
| April | 36.7°C29 Apr 1981 | -3.3°C6 Apr 1929 | 78 mm4 Apr 1926 | 243 mm1926 · driest 0 mm in 1909 | 115 |
| May | 40.0°C29 May 1950 | -2.8°C10 May 1905 | 71 mm27 May 1990 | 141 mm2005 · driest 0 mm in 1982 | 116 |
| June | 42.8°C3 Jun 1960 | -1.1°C3 Jun 1902 | 42 mm2 Jun 1967 | 62 mm1929 · driest 0 mm in 2020 | 119 |
| July | 45.0°C11 Jul 1913 | 3.9°C30 Jul 1924 | 34 mm8 Jul 1974 | 41 mm1974 · driest 0 mm in 1945 | 120 |
| August | 41.7°C24 Aug 2010 | -1.1°C26 Aug 2011 | 34 mm21 Aug 1968 | 43 mm1968 · driest 0 mm in 1992 | 119 |
| September | 46.1°C6 Sep 2022 | -1.1°C28 Sep 1914 | 74 mm23 Sep 1904 | 112 mm1904 · driest 0 mm in 1964 | 119 |
| October | 40.6°C3 Oct 1980 | -4.4°C12 Oct 1915 | 199 mm24 Oct 2021 | 331 mm2021 · driest 0 mm in 2020 | 119 |
| November | 33.3°C2 Nov 1967 | -6.1°C15 Nov 1916 | 138 mm21 Nov 2024 | 397 mm2024 · driest 0 mm in 1929 | 118 |
| December | 28.3°C26 Dec 1967 | -12.8°C25 Dec 1924 | 133 mm19 Dec 1981 | 455 mm1955 · driest 0 mm in 1989 | 119 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 4 | 5 |
| February | <1 | 0 | 3 | 5 |
| March | 3 | <1 | <1 | 5 |
| April | 5 | <1 | 0 | 2 |
| May | 8 | 2 | 0 | 1 |
| June | 16 | 6 | 0 | <1 |
| July | 19 | 7 | 0 | 0 |
| August | 21 | 9 | 0 | 0 |
| September | 19 | 10 | 0 | 0 |
| October | 15 | 6 | 0 | 1 |
| November | 3 | <1 | 2 | 3 |
| December | <1 | 0 | 5 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 5% | 36% | 17% | 45% | 12.1–16.1°C |
| February | 19% | 34% | 17% | 42% | 14.5–19.1°C |
| March | 34% | 31% | 13% | 36% | 16.2–21.4°C |
| April | 55% | 19% | 6% | 17% | 18.6–23.3°C |
| May | 76% | 11% | 3% | 8% | 21.1–26.1°C |
| June | 93% | 3% | <1% | 1% | 24.1–29.3°C |
| July | 99% | <1% | <1% | 0% | 26.0–30.3°C |
| August | 99% | <1% | <1% | <1% | 26.2–30.5°C |
| September | 94% | 4% | <1% | 3% | 26.0–30.7°C |
| October | 79% | 13% | 5% | 11% | 22.6–27.6°C |
| November | 39% | 25% | 11% | 31% | 16.8–21.6°C |
| December | 6% | 33% | 15% | 39% | 12.6–16.4°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 5393287
- NOAA station
- USC00047965 · SANTA ROSA
- Station distance
- 1.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 21 usable years
- Daylight
- Calculated from latitude 38.44°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 37 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.