May
Other strong months: April and November
98/100 weather score
United States · 1991–2020
Best time to visit
Tustin
For Tustin, May has the most comfortable weather in our climate comparison. Typical daytime highs are 24.3°C, nights average 14.2°C, and rainfall totals about 7 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthMay
Typical daytime high24.3°C
Typical night-time low14.2°C
May rainfall7 mm
July
Other strong months: August and September
90/100 weather score
December
Other strong months: March and April
89/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
9 months fit your choices for Tustin
February has the lowest comfort score at 72 out of 100, compared with May at 98. The main reason is that nights drop to 9.4°C, and days reach only 21.3°C, 3° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Tustin?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Tustin?
May is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 24.3°C and 7 mm of rain.
What is the hottest month in Tustin?
August is hottest in this record, with a typical daytime high of 29.8°C and a night-time low of 18.3°C.
Which month has the least rain?
August has the lowest monthly rainfall total at 0 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 21.3°C | 9°C | 73 mm | 5.3 | 15.1°C | 10 h 08 | 73 | Strong coverage |
| February | 21.3°C | 9.4°C | 81 mm | 5.6 | 15.0°C | 10 h 55 | 72 | Strong coverage |
| March | 22.5°C | 10.8°C | 43 mm | 3.9 | 15.2°C | 11 h 52 | 86 | Strong coverage |
| April | 23.5°C | 12°C | 21 mm | 2.3 | 15.7°C | 12 h 59 | 93 | Strong coverage |
| May | 24.3°C | 14.2°C | 7 mm | 1 | 17.0°C | 13 h 53 | 98 | Strong coverage |
| June | 26°C | 15.9°C | 2 mm | 0.3 | 18.5°C | 14 h 23 | 92 | Strong coverage |
| July | 28.6°C | 17.9°C | 1 mm | 0.3 | 20.2°C | 14 h 11 | 80 | Strong coverage |
| August | 29.8°C | 18.3°C | 0 mm | 0 | 20.7°C | 13 h 24 | 75 | Strong coverage |
| September | 29.4°C | 17.4°C | 3 mm | 0.4 | 20.5°C | 12 h 20 | 78 | Strong coverage |
| October | 27°C | 15°C | 14 mm | 1.5 | 19.3°C | 11 h 17 | 90 | Strong coverage |
| November | 23.9°C | 11.2°C | 20 mm | 2.4 | 17.6°C | 10 h 22 | 93 | Strong coverage |
| December | 20.8°C | 8.6°C | 58 mm | 4.7 | 15.8°C | 9 h 55 | 73 | Strong coverage |
What has changed
Recent daytime highs are
1.0°C warmer in Tustin.
Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.
Jan
+0.8
Feb
+0.4
Mar
+0.9
Apr
+1.2
May
+0.5
Jun
+0.9
Jul
+1.0
Aug
+1.4
Sep
+1.5
Oct
+1.2
Nov
+1.3
Dec
+0.4
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 35.6°C31 Jan 2003 | -8.9°C12 Jan 1989 | 107 mm26 Jan 1956 | 343 mm1995 · driest 0 mm in 1945 | 110 |
| February | 35.0°C9 Feb 2016 | -5.6°C14 Feb 1989 | 119 mm16 Feb 1927 | 355 mm1998 · driest 0 mm in 1984 | 110 |
| March | 37.8°C17 Mar 2026 | -2.2°C5 Mar 1948 | 87 mm7 Mar 1952 | 255 mm1941 · driest 0 mm in 1956 | 108 |
| April | 40.0°C5 Apr 1989 | -0.6°C11 Apr 1953 | 89 mm6 Apr 1926 | 154 mm1926 · driest 0 mm in 1997 | 109 |
| May | 40.6°C3 May 2004 | 1.7°C4 May 1950 | 30 mm22 May 1921 | 89 mm1921 · driest 0 mm in 1985 | 111 |
| June | 44.4°C14 Jun 1917 | 3.9°C8 Jun 1950 | 32 mm5 Jun 1993 | 33 mm1993 · driest 0 mm in 1966 | 110 |
| July | 45.6°C6 Jul 2018 | 5.6°C7 Jul 1948 | 6 mm8 Jul 1945 | 11 mm2015 · driest 0 mm in 1984 | 109 |
| August | 41.1°C18 Aug 2020 | 7.2°C21 Aug 1959 | 46 mm17 Aug 1977 | 53 mm1977 · driest 0 mm in 1929 | 110 |
| September | 45.0°C6 Sep 2024 | 4.4°C26 Sep 1948 | 71 mm25 Sep 1939 | 99 mm1939 · driest 0 mm in 1954 | 110 |
| October | 41.1°C16 Oct 1958 | 1.1°C12 Oct 1924 | 80 mm20 Oct 2004 | 123 mm2004 · driest 0 mm in 1961 | 108 |
| November | 38.3°C1 Nov 1966 | -4.4°C28 Nov 1919 | 74 mm1 Nov 1927 | 175 mm1965 · driest 0 mm in 1975 | 110 |
| December | 35.0°C3 Dec 1958 | -5.6°C31 Dec 1918 | 95 mm22 Dec 1945 | 275 mm2010 · driest 0 mm in 1976 | 110 |
| Month | Days 25°C+ | Days 30°C+ | Heavy rain (10 mm+) |
|---|---|---|---|
| January | 7 | <1 | 3 |
| February | 6 | 1 | 3 |
| March | 7 | 2 | 2 |
| April | 10 | 3 | <1 |
| May | 11 | 2 | <1 |
| June | 19 | 3 | <1 |
| July | 29 | 10 | 0 |
| August | 30 | 14 | 0 |
| September | 27 | 12 | <1 |
| October | 20 | 7 | <1 |
| November | 11 | 3 | <1 |
| December | 5 | <1 | 2 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 49% | 19% | 8% | 18% | 18.0–23.3°C |
| February | 51% | 20% | 9% | 23% | 18.4–23.1°C |
| March | 63% | 16% | 6% | 13% | 19.3–23.9°C |
| April | 77% | 9% | 3% | 5% | 21.1–25.0°C |
| May | 90% | 4% | <1% | <1% | 21.8–26.2°C |
| June | 98% | 1% | <1% | 0% | 24.0–28.0°C |
| July | 99% | <1% | 0% | <1% | 27.1–30.2°C |
| August | 99% | <1% | <1% | 0% | 27.5–31.1°C |
| September | 98% | 3% | <1% | 1% | 27.0–31.4°C |
| October | 94% | 5% | 1% | 2% | 24.5–28.7°C |
| November | 79% | 10% | 4% | 7% | 21.2–25.9°C |
| December | 53% | 16% | 7% | 15% | 18.2–22.9°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 5404119
- NOAA station
- USC00047888 · SANTA ANA FIRE STN
- Station distance
- 3.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 33.75°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 14 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.
Next step
Choose your month.
Then plan the details.
The weather comparison for Tustin is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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