GWC’s Weather Week That Was - July 27 - August 2, 2025

Watch footage of the intense thunder and lightning from a tornado-warned supercell thunderstorm at Greg’s Weather Center in South Plainfield, NJ, on July 31, 2025.

GWC’s Weather Week That Was – July 27 – August 2, 2025

Location: South Plainfield, NJ

Latitude: 40.58 N

Longitude: 74.42 W

Date	High Temp	Low Temp	Diurnal Range	Rainfall	Peak Rainfall Rate	High Pressure	Low Pressure	Pressure Change
7/27/2025	86	69	17	0.03	0.04	30.06	29.87	0.19
7/28/2025	95	71	24	0.00	0.00	29.98	29.92	0.06
7/29/2025	97	72	25	0.00	0.00	29.99	29.92	0.07
7/30/2025	96	73	23	0.00	0.00	29.99	29.88	0.11
7/31/2025	88	66	22	0.23	6.62	29.94	29.87	0.07
8/1/2025	73	62	11	0.08	0.18	30.19	30.01	0.18
8/2/2025	80	58	22	0.00	0.00	30.22	30.14	0.08

Table 1: GWC’s Weather Week That Was – July 27 – August 2, 2025

Temperature for the Week of July 27 – August 2, 2025

Average High Temperature: 87.9°
Max Temperature: 97° on July 29th
Min Temperature: 58° on August 2nd

GWC’s Weather Week That Was - July 27 - August 2, 2025 - Temperature — **Chart 1**: Temperature for the Week of July 27 – August 2, 2025.

Diurnal Range for the Week of July 27 – August 2, 2025

NOTE: The diurnal range of temperature is the difference between the high temperature and the low temperature on a given day.

Average Diurnal Range of Temperature: 20.6°
Max Diurnal Range: 25° on July 29th
Min Diurnal Range: 11° on August 1st

GWC’s Weather Week That Was - July 27 - August 2, 2025 - Diurnal Range — **Chart 2**: Diurnal Range of Temperature for the Week of July 27 – August 2, 2025.

Rainfall for the Week of July 27 – August 2, 2025

Average Daily Rainfall: 0.05 inches
Max Rainfall: 0.23 inches on July 31st.
Min Rainfall: 0.00 inches on July 28th, 29th, 30th, and August 2nd.
Peak Rainfall Rate: 6.62 inches per hour on July 31st.

GWC’s Weather Week That Was - July 27 - August 2, 2025 - Rainfall — **Chart** 3: Rainfall for the Week of July 27 – August 2, 2025.

Pressure for the Week of July 27 – August 2, 2025

Max Pressure: 30.22 on August 2nd
Min Pressure: 29.87 on July 27th and July 31st
Largest Pressure Drop: 0.19 of an inch or 6.3 millibars from 12:00 AM to 6:31 PM on July 27th.
Largest Pressure Rise: 0.35 of an inch or 11.7 millibars from 1:15 PM on July 31st to 9:00 AM on August 2nd.

GWC’s Weather Week That Was - July 27 - August 2, 2025 - Pressure — **Chart 4**: Pressure for the Week of July 27 – August 2, 2025

Summary

The last days of July and the first two days of August 2025 were defined by two major weather stories. A heatwave for the first part of the week, and another round of fierce severe weather on Thursday, July 31st. From July 28th to July 30th, the third major heatwave of the year gripped Northwestern Middlesex County and the rest of Central Jersey.

During those three days, the high temperature was at least 95 including the warmest day of the month on July 29th at 97 degrees. The heatwave finally broke on July 31st when severe storms produced the second-ever Tornado Warning at Greg’s Weather Center. The first was during the onslaught brought on by the remnants of Hurricane Ida on September 1, 2021. The storms produced only 0.23 inches of rain, but it was a brief torrential rain with a rainfall rate of 6.62 inches per hour at 2:19 PM.

Watch a 28-minute movie of the Supercell Thunderstorm on July 31, 2025, that produced the first tornado warning at Greg’s Weather Center in South Plainfield, NJ, since the remnants of Hurricane Ida in September 2021.