May
Other strong months: June and October
96/100 weather score
United States · 1991–2020
Best time to visit
Seal Beach
For Seal Beach, May has the most comfortable weather in our climate comparison. Typical daytime highs are 23.2°C, nights average 14.5°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 high23.2°C
Typical night-time low14.5°C
May rainfall7 mm
August
Other strong months: September and July
93/100 weather score
March
Other strong months: November and December
94/100 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.
10 months fit your choices for Seal Beach
The lowest comfort score is 67 out of 100. January and February share that score. In January, that is mainly because days reach only 19.9°C, 4° below the 24°C the score treats as ideal, and nights drop to 8.3°C.
Quick answers
Planning a trip to Seal Beach?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Seal Beach?
May is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 23.2°C and 7 mm of rain.
What is the hottest month in Seal Beach?
August is hottest in this record, with a typical daytime high of 28.8°C and a night-time low of 18.6°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 | 19.9°C | 8.3°C | 73 mm | 5 | 15.1°C | 10 h 08 | 67 | Strong coverage |
| February | 19.6°C | 9.1°C | 77 mm | 5.3 | 15.0°C | 10 h 55 | 67 | Strong coverage |
| March | 20.7°C | 10.7°C | 42 mm | 4.2 | 15.1°C | 11 h 52 | 79 | Strong coverage |
| April | 22.3°C | 12.1°C | 14 mm | 1.8 | 15.6°C | 12 h 59 | 89 | Strong coverage |
| May | 23.2°C | 14.5°C | 7 mm | 1 | 16.9°C | 13 h 53 | 96 | Strong coverage |
| June | 24.9°C | 16.4°C | 2 mm | 0.2 | 18.4°C | 14 h 23 | 95 | Strong coverage |
| July | 27.6°C | 18.3°C | 1 mm | 0.3 | 20.0°C | 14 h 11 | 82 | Strong coverage |
| August | 28.8°C | 18.6°C | 0 mm | 0.1 | 20.6°C | 13 h 24 | 78 | Strong coverage |
| September | 28.3°C | 17.7°C | 2 mm | 0.3 | 20.4°C | 12 h 20 | 81 | Strong coverage |
| October | 25.6°C | 15°C | 13 mm | 1.6 | 19.3°C | 11 h 17 | 95 | Strong coverage |
| November | 22.7°C | 10.9°C | 19 mm | 2.3 | 17.5°C | 10 h 22 | 88 | Strong coverage |
| December | 19.5°C | 8°C | 55 mm | 4.3 | 15.8°C | 9 h 55 | 69 | Strong coverage |
What has changed
Recent daytime highs are
0.5°C warmer in Seal Beach.
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
+1.0
Feb
+0.3
Mar
+0.9
Apr
+0.7
May
-0.2
Jun
0.0
Jul
-0.2
Aug
+0.2
Sep
+1.0
Oct
+0.8
Nov
+0.9
Dec
+0.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 33.9°C31 Jan 2003 | -3.9°C13 Jan 1963 | 128 mm26 Jan 1956 | 324 mm1995 · driest 0 mm in 2003 | 77 |
| February | 33.3°C9 Feb 2016 | 0.6°C12 Feb 1965 | 80 mm6 Feb 2024 | 307 mm1998 · driest 0 mm in 1961 | 77 |
| March | 37.2°C17 Mar 2026 | 0.6°C8 Mar 1964 | 88 mm1 Mar 1983 | 222 mm1983 · driest 0 mm in 1997 | 77 |
| April | 40.6°C6 Apr 1989 | 3.3°C7 Apr 1975 | 41 mm11 Apr 1999 | 112 mm1965 · driest 0 mm in 1997 | 78 |
| May | 40.0°C3 May 2004 | 4.4°C7 May 1964 | 52 mm8 May 1977 | 59 mm1977 · driest 0 mm in 2001 | 78 |
| June | 42.8°C16 Jun 1981 | 8.3°C7 Jun 1950 | 22 mm5 Jun 1993 | 22 mm1993 · driest 0 mm in 2001 | 78 |
| July | 42.8°C6 Jul 2018 | 10.6°C15 Jul 1960 | 9 mm18 Jul 2015 | 14 mm2015 · driest 0 mm in 1957 | 78 |
| August | 40.6°C30 Aug 1967 | 10.6°C11 Aug 1950 | 58 mm20 Aug 2023 | 68 mm2023 · driest 0 mm in 1963 | 77 |
| September | 43.9°C27 Sep 2010 | 10.0°C30 Sep 1965 | 35 mm24 Sep 1986 | 37 mm1976 · driest 0 mm in 2001 | 77 |
| October | 43.9°C15 Oct 1961 | 3.9°C31 Oct 1972 | 50 mm20 Oct 2004 | 136 mm2004 · driest 0 mm in 1980 | 76 |
| November | 38.3°C1 Nov 1966 | 1.1°C17 Nov 1958 | 55 mm28 Nov 2019 | 154 mm1965 · driest 0 mm in 1977 | 76 |
| December | 33.3°C3 Dec 1958 | -2.2°C22 Dec 1990 | 81 mm4 Dec 1974 | 265 mm2010 · driest 0 mm in 1950 | 76 |
| Month | Days 25°C+ | Days 30°C+ | Heavy rain (10 mm+) |
|---|---|---|---|
| January | 5 | <1 | 3 |
| February | 4 | <1 | 2 |
| March | 5 | 1 | 1 |
| April | 7 | 2 | <1 |
| May | 8 | 2 | <1 |
| June | 14 | 2 | <1 |
| July | 25 | 8 | 0 |
| August | 28 | 11 | 0 |
| September | 23 | 11 | <1 |
| October | 16 | 6 | <1 |
| November | 9 | 3 | <1 |
| December | 3 | <1 | 2 |
The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 96); on 2011–2025 it is May (96). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 38% | 16% | 7% | 17% | 17.1–22.2°C |
| February | 39% | 17% | 7% | 19% | 17.7–22.0°C |
| March | 45% | 14% | 5% | 11% | 18.2–22.3°C |
| April | 64% | 7% | 2% | 4% | 19.8–24.1°C |
| May | 84% | 3% | <1% | <1% | 20.9–24.9°C |
| June | 97% | <1% | <1% | 0% | 22.6–26.9°C |
| July | 99% | <1% | 0% | 0% | 25.8–29.8°C |
| August | 99% | <1% | <1% | <1% | 26.6–30.3°C |
| September | 98% | 2% | <1% | <1% | 25.9–30.4°C |
| October | 92% | 4% | <1% | 2% | 23.2–28.1°C |
| November | 69% | 9% | 4% | 5% | 20.3–25.0°C |
| December | 40% | 13% | 5% | 12% | 17.2–21.9°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 5394086
- NOAA station
- USW00023129 · LONG BEACH DAUGHERTY AP
- Station distance
- 8.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 33.74°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 13 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 Seal Beach 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.
How travel partnerships will work