St. Simons Island, GA weather in July
July in St. Simons Island: hot and oppressively humid, with frequent rain. Highs 91°F, lows 76°F, rain on about 11 days. This is the peak of the warm season in St. Simons Island.
- Normal high
- 91°F
- Normal low
- 76°F
- Wet days
- 11
- 4.2 in total
- Muggy days
- 31
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 90°F | 91°F |
| Normal low | 75°F | 77°F |
| Chance of a wet day | 35% | 38% |
| Sunrise / sunset | 6:25 am / 8:33 pm | 6:42 am / 8:21 pm |
| Daylight | 14.1 h | 13.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical July day
- 6 am77°Fdew point 73°F
- 9 am83°Fdew point 74°F
- Noon88°Fdew point 74°F
- 3 pm87°Fdew point 74°F
- 6 pm83°Fdew point 74°F
- 9 pm81°Fdew point 74°F
NOAA hourly normals (local standard time) from Brunswick Malcolm Mckinnon Airport (1 mi away); average wind 8 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph21 of 31
- Hot dayshigh 90°F or more17 of 31
- Muggy daysdaily mean dew point 65°F or more31 of 31
- Wet daysat least 0.01 in of rain or melted snow11 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 4.2 in; a dry July brings about 2.5 in and a wet one about 5.1 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How July varies from year to year
- Warmest July, 1991-20201993: average high 94°F
- Coolest July2013: average high 87°F
- Wettest July1998: 10.0 in
- Driest July2012: 1.2 in
- Highest reading103°F (July 20, 2000)
- Lowest reading68°F (July 23, 2007)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 88°F | 91°F | 90°F |
| Normal low | 74°F | 76°F | 76°F |
| Wet days | 11 | 11 | 13 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 14.1 h | 13.9 h | 13.3 h |
Highs change by +3°F from June and -1°F into August.
How St. Simons Island ranks in July
- Normal high125th warmest of 378 cities; 6th of 8 in Georgia
- Wet days254th driest of 378
- Comfortable days286th most of 340
What to pack for St. Simons Island in July
- Light, breathable clothing – highs near 91°F and about 31 muggy days
- A rain jacket or umbrella – rain on about 11 days
- A swimsuit – about 21 beach days
Heating and cooling
July has 0 heating degree days and 575 cooling degree days (base 65°F), 14% of the year's total heating and cooling demand.
Questions
How hot is St. Simons Island in July?
The normal high is 91°F and the normal low is 76°F. From 1991 to 2020 the hottest July reading was 103°F (July 20, 2000).
Does it rain a lot in St. Simons Island in July?
About 11 days in July have at least 0.01 in of precipitation, and the normal total is 4.2 in. The wettest July in 1991-2020 was in 1998 (10.0 in); the driest was in 2012 (1.2 in).
Is July a good time to visit St. Simons Island?
July ranks 11th of 12 months on our comfort score for St. Simons Island (41 out of 100). It has almost no comfortable days and about 17 days at 90°F or hotter. The best months are March, April and November.
Where the numbers come from
- Temperature, rain, frost dates and humidity and wind by hour: Brunswick Malcolm Mckinnon Airport (USW00013878), 1.2 mi N of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
- Snowfall: Brunswick (USC00091340), 7.0 mi WNW of the city center, 13 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Sapelo Is (USC00097808), 19 mi NNE of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Malcolm Mc Kinnon Airport (722137-13878), 1.2 mi N of the city center, 14 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).